Tagged: Trending With Impact

New Drug May Boost Effectiveness of Glioblastoma Treatment

January 25, 2024

In a new study, researchers investigated the activity of gartisertib, a potent ATR inhibitor, alone and in combination with standard therapy in multiple glioblastoma cell lines.

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Glioblastoma is a type of brain cancer that is very aggressive and difficult to treat. The current standard treatment involves surgery, radiation therapy, and chemotherapy with a drug called temozolomide (TMZ). However, many glioblastoma cells can resist the DNA-damaging effects of TMZ and radiation by activating a mechanism called the DNA damage response (DDR). This mechanism, while beneficial in normal cells, is detrimental to cancer therapy because it allows cancer cells to repair damage and continue to grow and divide. There is a need to counteract this mechanism in glioblastoma cancer cells.

In a new study, researchers Mathew Lozinski, Nikola A. Bowden, Moira C. Graves, Michael Fay, Bryan W. Day, Brett W. Stringer, and Paul A. Tooney from University of Newcastle, Hunter Medical Research Institute, GenesisCare, QIMR Berghofer Medical Research Institute, and Griffith University found that a drug called gartisertib may overcome this resistance by inhibiting a key protein involved in the DDR, called ataxia-telangiectasia and Rad3-Related protein (ATR). On January 16, 2024, the researchers published their new research paper in Oncotarget’s Volume 15, entitled, “ATR inhibition using gartisertib enhances cell death and synergises with temozolomide and radiation in patient-derived glioblastoma cell lines.”

“Here, we investigated the activity of gartisertib, a potent ATR inhibitor, alone and in combination with TMZ and/or RT in 12 patient-derived glioblastoma cell lines.”

The Study

In this study, the team tested the effects of gartisertib alone and in combination with TMZ and radiation in 12 patient-derived glioblastoma cell lines. They found that gartisertib alone reduced the viability of glioblastoma cells, and that the sensitivity was associated with the frequency of DDR mutations and the expression of genes involved in the G2 phase of the cell cycle (the phase where cells prepare for division and check for DNA damage). The researchers also found that gartisertib enhanced the cell death induced by TMZ and radiation, and that the combination was more synergistic than TMZ and radiation alone.

Interestingly, gartisertib was more effective in glioblastoma cells that had unmethylated MGMT promoters and were resistant to TMZ and radiation. (MGMT is a gene that encodes an enzyme that can reverse the damage caused by TMZ, and its promoter is a region that controls its expression. Methylation is a chemical modification that can silence genes, so unmethylated MGMT promoters mean higher MGMT expression and more resistance to TMZ.) The researchers also analyzed the gene expression changes in glioblastoma cells treated with gartisertib, and found that the drug upregulated pathways related to the innate immune system. The researchers speculated that gartisertib may trigger an immune response against glioblastoma cells, which could enhance the anti-tumor effects of the drug.

“We showed that gartisertib alone potently reduced the cell viability of glioblastoma cell lines, where sensitivity was associated with the frequency of DDR mutations and higher expression of the G2 cell cycle pathway. ATR inhibition significantly enhanced cell death in combination with TMZ and RT and was shown to have higher synergy than TMZ+RT treatment. MGMT promoter unmethylated and TMZ+RT resistant glioblastoma cells were also more sensitive to gartisertib. Analysis of gene expression from gartisertib treated glioblastoma cells identified the upregulation of innate immune-related pathways.”

Conclusion

The study is the first to demonstrate the activity of gartisertib in patient-derived glioblastoma cell lines, and it provides evidence that ATR inhibition may be a promising strategy to improve the outcomes of glioblastoma patients. Gartisertib is a potent and selective inhibitor of ATR that has been tested in a phase 1 clinical trial for patients with advanced solid tumors. The researchers suggest that further studies are needed to evaluate the safety and efficacy of gartisertib in combination with TMZ and radiation in glioblastoma patients, and to explore the potential role of the immune system in mediating the anti-tumor effects of the drug.

“In conclusion, this study identifies gartisertib as a potent ATRi within patient-derived glioblastoma cell lines. […] Further investigation of the concept of ATR inhibition for treatment of brain tumours, especially in vivo with brain penetrant compounds, is needed to validate these findings. Lastly, ATR inhibition alters the gene expression of innate immune and inflammatory signalling pathways within glioblastoma cells, which requires additional validation and investigation as a strategy to provoke an immunomodulatory response.”

Click here to read the full research paper in Oncotarget.

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Oncotarget is an open-access, peer-reviewed journal that has published primarily oncology-focused research papers since 2010. These papers are available to readers (at no cost and free of subscription barriers) in a continuous publishing format at Oncotarget.com. Oncotarget is indexed/archived on MEDLINE / PMC / PubMed.

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How Osteopontin Stimulates Mitochondrial Biogenesis and Cancer Metastasis

January 11, 2024

In this new study, researchers investigated the role of Osteopontin splice variants in cancer metastasis.

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Mitochondrial biogenesis, the process of increasing the size and number of mitochondria within cells, plays a crucial role in cancer metastasis. Metastasizing cells exhibit a unique metabolism that differs from the well-known Warburg effect observed in primary tumors. While primary tumors primarily rely on glycolysis for energy production, metastatic cells rely on oxidative phosphorylation and ATP generation for short-term energy needs. However, over longer time frames, mitochondrial biogenesis becomes a prominent feature in the success of metastasis.

In a new study, researchers Gulimirerouzi Fnu and Georg F. Weber from the University of Cincinnati’s James L. Winkle College of Pharmacy investigate the connection between short-term oxidative metabolism and long-term mitochondrial biogenesis in cancer metastasis. They hypothesized that Osteopontin splice variants, specifically Osteopontin-c, stimulate an increase in mitochondrial size through the activation of specific signaling mechanisms. On December 1, 2023, their new research paper was published in Oncotarget, entitled, “Osteopontin induces mitochondrial biogenesis in deadherent cancer cells.”

“Over longer time frames, mitochondrial biogenesis becomes a pronounced feature and aids metastatic success. It has not been known whether or how these two phenomena are connected. We hypothesized that Osteopontin splice variants, which synergize to increase ATP levels in deadherent cells, also increase the mitochondrial mass via the same signaling mechanisms.”

The Role of Osteopontin Variants in Mitochondrial Biogenesis

Deadhesion, the process of detaching cancer cells from the extracellular matrix, is known to induce metabolic reprogramming and promote cancer cell survival in circulation. Osteopontin (OPN), a cytokine produced by cancer cells, has been implicated in tumor progression and the development of metastases. It mediates tumor cell survival and expansion under deadherent conditions, making it an ideal candidate for studying the mechanisms behind mitochondrial biogenesis. The authors of the research paper focused on two Osteopontin splice variants, Osteopontin-a and Osteopontin-c, and their effects on mitochondrial biogenesis.

Through their experiments with breast tumor cells, the authors found that both Osteopontin-a and Osteopontin-c contribute to mitochondrial biogenesis in deadherent cells. However, Osteopontin-c was more effective in stimulating an increase in mitochondrial size compared to Osteopontin-a. The authors also observed that the autocrine effects of Osteopontin variants are critical for the survival and anchorage-independence of disseminating malignant cells.

The Role of CD44v and SLC7A11 in Osteopontin Signaling

To further elucidate the mechanism behind Osteopontin-induced mitochondrial biogenesis, the authors investigated the receptors involved in Osteopontin signaling. They focused on CD44, a cell surface receptor known to interact with Osteopontin, and its variant CD44v. The authors found that Osteopontin-induced mitochondrial biogenesis is mediated via the binding of Osteopontin to CD44v.

Additionally, the authors discovered that the chloride-dependent cystine-glutamate transporter SLC7A11 plays a crucial role in Osteopontin signaling. The upregulation and co-ligation of SLC7A11, along with CD44v, leads to the activation of PGC-1, a known inducer of mitochondrial biogenesis. Surprisingly, the authors found that peroxide, an important intermediate in this signaling cascade, acts upstream of PGC-1 and is likely produced as a consequence of SLC7A11 recruitment and activation.

In Vivo Implications and Therapeutic Targets

To validate the relevance of their findings in clinical settings, the authors analyzed gene expression profiles in breast cancer metastases and metastases from other types of cancers. They identified the master regulator of mitochondrial biogenesis, PPARG, as well as its downstream effectors NRF1 and BACH1, to be upregulated in various metastases. These findings suggest that the Osteopontin-induced activation of PGC-1 and subsequent mitochondrial biogenesis may play a crucial role in cancer metastasis.

The authors also conducted in vivo experiments using mouse models. They observed that suppression of the biogenesis-inducing mechanisms led to a reduction in disseminated tumor mass. These findings not only confirm the functional connection between short-term oxidative metabolism and long-term mitochondrial biogenesis in cancer metastasis but also provide potential mechanisms and targets for treating cancer metastasis.

Conclusion

This study provides valuable insights into the role of Osteopontin splice variants in regulating mitochondrial biogenesis in metastatic cancer cells. The researchers demonstrated that Osteopontin-c stimulates an increase in mitochondrial size through the activation of specific signaling mechanisms involving CD44v and SLC7A11. These findings have significant implications for understanding the metabolic adaptations of metastatic cancer cells and suggest potential targets for therapeutic interventions. Further research is needed to fully elucidate the intricate signaling pathways involved in Osteopontin-induced mitochondrial biogenesis and to explore the clinical applications of these findings in cancer treatment.

“This study confirms a functional connection between the short-term oxidative metabolism and the longer-term mitochondrial biogenesis in cancer metastasis – both are induced by Osteopontin-c. The results imply possible mechanisms and targets for treating cancer metastasis.”

Click here to read the full research paper in Oncotarget.

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Immunotherapy Response in Primary vs Metastatic Pancreatic Cancer

November 16, 2023

In this editorial, researchers delve into the immunotherapeutic challenges posed by the tumor microenvironment and liver metastasis in pancreatic cancer.

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Pancreatic ductal adenocarcinoma (PDA), a common type of pancreatic cancer, has proven to be largely resistant to immunotherapy, a treatment that uses the body’s immune system to fight cancer. Despite numerous successful pre-clinical trials using sophisticated PDA mouse models, clinical trials have failed to show a significant improvement in survival.

In a recent editorial, researchers Brian Diskin, Sarah Schwartz and George Miller from Trinity Health of New England shed light on the complex interplay between the immune system and pancreatic cancer. Their paper was published in Oncotarget on April 24, 2023, and entitled, “The critical immune basis for differential responses to immunotherapy in primary versus metastatic pancreatic cancer.”

Tumor Microenvironment and Liver Metastasis: Challenges in Pancreatic Cancer

The authors attribute PDA immunotherapy resistance to the unique characteristics of the tumor microenvironment (TME). The TME is often hypoxic and fibrotic, making it inaccessible to immune cells. Furthermore, the immune cells that do infiltrate the TME often have tolerogenic features, meaning they are more likely to tolerate the presence of cancer cells rather than attack them.

PDA most commonly metastasizes to the liver, an organ known for its immune tolerance. The liver is home to a diverse array of innate immune populations, including NK cells, Kupfer cells, NKT cells, and double negative T cells. Despite this, the liver is the most common location for metastasis from gastrointestinal cancers.

“It is an unfortunate fact that all failed clinical trials assessing immunotherapeutic efficacy were conducted in metastatic PDA, whereas basic preclinical investigations are usually performed in primary PDA using genetically engineered mouse models. We postulated that this dichotomy may explain the gap between preclinical promise and ultimate clinical failure.”

Divergent Responses to Immunotherapy: Primary vs. Metastatic

“The potentially divergent responses to immunotherapy in the respective environments of primary versus metastatic PDA within the same host has not been well-studied.”

The authors highlight the lack of research into the potentially divergent responses to immunotherapy in primary versus metastatic PDA. They argue that this gap in knowledge may explain the discrepancy between the promising results of pre-clinical trials and the disappointing outcomes of clinical trials.

In their research, they discovered that the TMEs of primary PDA and liver metastases differ significantly, and this difference plays a critical role in the site-specific response to immunotherapy. They found that liver metastases are uniquely resistant to immunotherapies, in stark contrast to the immunotherapeutic responsiveness of primary PDA.

“We discovered that the respective TMEs of primary PDA and liver metastases differ markedly and this fact plays a critical role in dictating site-specific PDA response to immunotherapy [6].”

The Role of B Cells

The researchers identified B cells as a key player in this differential response. They found that B cells constituted approximately 25% of the tumor-infiltrating lymphocytes in metastatic PDA liver deposits, compared to approximately 10% in primary PDA. They also discovered a novel population of CD24+CD44–CD40– B cells in the metastatic liver, which is recruited to the metastatic milieu by Muc1hiIL18hi tumor cells.

“[…] by targeting B cells or blocking CD200/BTLA, we demonstrated enhanced macrophage and T-cell immunogenicity, which enabled immunotherapeutic efficacy of liver metastases.”

However, the authors note that primary PDA sites lack this b-cell population. Instead, they are characterized by macrophages and effector T cells that have a higher ability to provoke an immune response. This makes their immunotherapeutic responsiveness far more robust than metastatic liver PDA.

Conclusion

This research underscores the importance of understanding the immune basis of differential responses to immunotherapy in primary versus metastatic pancreatic cancer. It highlights the need for further research into the role of the TME and immune cells like B cells in the response to immunotherapy. Such insights could pave the way for more effective treatments for this challenging disease.

“[…] our data suggest that models of primary PDA are poor surrogates for evaluating immunity or treatment response in advanced disease.”

Click here to read the full editorial paper in Oncotarget.

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Whole-Genome Doubling and Aneuploidy in Human Cancer

August 10, 2023

In a new editorial paper, researchers from Tel Aviv University discuss a recent study exploring how whole-genome doubling shapes the aneuploidy landscape of human cancers.

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Whole-genome doubling (WGD) and aneuploidy are two common genomic alterations that occur in human cancers. WGD is a macro-evolutionary event that results in the duplication of the entire genome, while aneuploidy is a micro-evolutionary event that results in the gain or loss of individual chromosomes or chromosome arms. Both WGD and aneuploidy can have profound effects on cellular physiology, gene expression and genome stability, and are associated with tumor initiation, progression and drug resistance.

However, the relationship between WGD and aneuploidy is complex and context-dependent. In a new editorial paper, researchers Kavya Prasad and Uri Ben-David from Tel Aviv University discuss a recent study exploring how WGD shapes the aneuploidy landscape of human cancers. Their editorial was published in Oncotarget on April 26, 2023, and entitled, “A balancing act: how whole-genome doubling and aneuploidy interact in human cancer.”

“It is known that tumors that have undergone WGD are more permissive to aneuploidy, but whether WGD also affects aneuploidy patterns has remained an open question.”

The Study

The researchers analyzed 5,586 clinical tumor samples that had not undergone WGD (WGD-) and 3,435 tumors that had (WGD+) from The Cancer Genome Atlas (TCGA), across 22 tumor types. They found that WGD+ tumors were characterized by more promiscuous aneuploidy patterns, in line with increased aneuploidy tolerance. The relative prevalence of recurrent aneuploidies decreased in WGD+ tumors, suggesting that WGD+ tumors are more tolerant to aneuploidy than WGD- tumors.

The genetic interactions between chromosome arms differed between WGD- and WGD+ tumors, resulting in different co-occurrence and mutual exclusivity patterns. The proportion of whole-chromosome aneuploidy was significantly higher in WGD+ tumors than in WGD- tumors, indicating that different mechanisms of aneuploidy formation are dominant in WGD- and WGD+ tumors. The authors proposed that whole-chromosome missegregation is more prevalent in WGD+ tumors due to increased centrosome amplification and multipolar mitoses.

To validate their findings from the clinical tumor analysis, the authors used human cancer cell lines that reproduced the WGD/aneuploidy interactions observed in vivo. They also induced WGD in human colon cancer cell lines by treating them with a microtubule-stabilizing drug, and followed the evolution of aneuploidy in the isogenic WGD+/WGD- cells under standard or selective conditions. These experiments confirmed that WGD alters the aneuploidy landscape of human cancer cells, and revealed a causal link between WGD and altered aneuploidy patterns.

“We note that these experiments were not powered to assess the associations between specific aneuploidies, which remain to be experimentally validated in future studies.”

Conclusions & Future Studies

In their editorial, the researchers note that their study prompts questions about how different tetraploidization methods affect aneuploidy landscapes. They used cytokinesis failure for cell lines, but processes like cell fusion could impact aneuploidy differently. Further research should explore how selection pressures shape karyotype evolution, considering factors beyond tissue type. Analyzing intra-chromosomal arm-level vs. whole-chromosomal aneuploidies may identify cancer-driving chromosome arms. Overall, this study provides novel insights into how WGD and aneuploidy interact in human cancer, and how this interaction affects tumor evolution. The authors suggest that the interaction between WGD and aneuploidy is a major contributor to tumor heterogeneity, adaptation, and drug resistance, and that targeting this interaction could be a promising therapeutic strategy.

“In summary, our recent study shows that WGD contributes to aneuploidy formation in human tumors in both qualitative and quantitative ways. Hence, we propose that the WGD status of the tumor should be taken into account when examining the tumorigenic role of individual aneuploidies or aneuploidy patterns. In general, WGD should be considered in the study of aneuploidy landscapes in human cancers.”

Click here to read the full editorial in Oncotarget.

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Targeting Ras in Cancer Therapies: Advances in Protein Engineering

July 14, 2023

In a new review, researchers from The Hebrew University of Jerusalem discuss the challenges associated with targeting Ras proteins and how protein engineering has emerged as a promising method to overcome these challenges.

Figure 3: Various scaffolds utilized to engineer binders to Ras and their binding epitopes. Targeting Ras in Cancer Therapies: Advances in Protein Engineering — Figure 3: Various scaffolds utilized to engineer binders to Ras and their binding epitopes.

Ras plays a crucial role in controlling various cellular processes by switching between active (Ras-GTP) and inactive (Ras-GDP) states with the help of specific molecules. In its active form, Ras interacts with multiple effector proteins, initiating downstream events. Humans have three Ras genes, resulting in four isoforms that have distinct expression patterns and unique functions in different tissues. Posttranslational modifications target Ras to the cell membrane, where it can form dimers and interact with effectors through common domains. Ras mutations, commonly found in pancreatic, colorectal and lung cancers, lock Ras in an active state, promoting continuous cell division and proliferation. Ras signaling disruption occurs through reduced catalytic activity, altered effector binding and decreased affinity for other regulatory proteins.

Although Ras has been considered difficult to target, recent advancements have identified potential binding pockets that can be addressed by small molecules, peptidomimetics and proteins. Inhibitors designed to covalently bind to the Ras G12C mutant have shown promise, leading to FDA-approved drugs for specific lung cancers. Additionally, protein-based inhibitors that target Ras and its interactions with effectors, regulatory proteins and guanine nucleotide exchange factors offer alternative strategies for therapeutic intervention. These developments have challenged the notion that Ras is “undruggable” and highlight the potential for effective treatments against various cancer types.

On July 1, 2023, researchers Atilio Tomazini and Julia M. Shifman from The Hebrew University of Jerusalem published a new review paper in Oncotarget, entitled, “Targeting Ras with protein engineering.” The authors provide an overview of the challenges associated with targeting Ras proteins with small molecules and discuss how protein engineering has emerged as a promising method to overcome these challenges.

“While the development of small-molecule Ras inhibitors has been reviewed elsewhere [40], we focus our review on protein-based Ras inhibitors, describing the methods for their engineering, various scaffolds used for inhibitor design, and prospects for delivery of the designed Ras inhibitors into the cellular cytoplasm, where Ras is located.”

Protein Engineering

Protein scaffolds offer alternative approaches to small molecule drugs for engineering protein-based inhibitors. Unlike small molecules, protein domains can bind to targets through large surface areas, providing high affinity and specificity. Antibodies, natural protein effectors and novel binding domains are commonly used as protein scaffolds. Antibodies can be engineered into smaller versions to overcome limitations, while natural effectors can be modified to enhance binding affinity. Novel binding domains, unrelated to the target protein, possess structural robustness and can be evolved to exhibit strong binding. All three classes of protein scaffolds have been utilized to engineer Ras binders and explore strategies to inhibit Ras oncogenesis.

“Interestingly, all classes of protein scaffolds, including antibodies, natural effectors, and novel binding domains, have been utilized for engineering of Ras binders, allowing scientists to target various sites on the Ras surface and to explore different strategies for inhibiting Ras oncogenesis […].”

Methods for engineering protein inhibitors can be categorized into experimental directed evolution and computational design, or a combination of both. Experimental techniques involve display technologies such as phage display, yeast surface display, ribosome display, and mRNA display. These methods allow for the construction of combinatorial libraries of protein mutants, which are then screened using the target protein as a selection “bait.” The selected binders are sequenced to identify high-affinity mutants. Negative selection steps can be incorporated to enhance specificity by eliminating binders to unwanted targets. The number of mutants that can be assayed depends on the display technology used, with each approach having its limitations.

In addition to experimental approaches, computational methods have been proposed for protein binder design. Computational design enables rational targeting of specific binding epitopes on the target protein. However, computationally designed binders often have weak initial binding affinities and require affinity maturation through experimental techniques. Computational methods have been successful in designing focused libraries for yeast surface display experiments, where small libraries of protein mutants are designed based on computational predictions. This approach narrows down the choices to the most promising mutants, facilitating directed evolution experiments. By combining computational and experimental approaches, protein inhibitors with superior affinity and specificity have been developed.

“We have summarized all the described engineered Ras protein-based binders and their properties in Table 1.”

The Future of Intracellular Transport for Ras Inhibitors

Efficient delivery of molecules that bind to intracellular Ras proteins is essential for suppressing pro-cancer pathways and promoting anti-cancer activities. To overcome the challenge of crossing the cell membrane, different strategies have emerged. One approach involves utilizing short cell-penetrating peptides (CPPs) that can be fused to the desired protein, allowing entry into cells through direct translocation or endocytosis. However, improving the release of cargo proteins from endosomes remains a hurdle. Supercharging proteins with positively charged surfaces or leveraging bacterial toxins with intrinsic delivery mechanisms are alternative methods for intracellular protein delivery. Additionally, coupling cargo proteins to nanoparticles or employing mRNA delivery systems have shown promise, although they have their own limitations.

These protein delivery techniques have been explored for targeting Ras inhibitors. For instance, a human IgG1 antibody was engineered to selectively bind to Ras-GTP, inhibiting downstream signaling. Fusion of Ras binding domains to CPPs demonstrated competitive inhibition of Ras/effector interactions. Furthermore, optimized bacterial secretion systems and lipid nanoparticle-encapsulated mRNA platforms have been employed for efficient intracellular delivery of Ras-binding molecules. These advancements open up possibilities for targeted cancer therapies and disease treatments by enabling effective delivery of Ras binders to their intracellular target, thus influencing cancer-related signaling pathways.

Conclusions

In summary, targeting Ras proteins, despite their historically challenging nature, has seen significant progress in recent years. Small molecules, peptidomimetics and protein-based inhibitors have emerged as potential strategies for inhibiting Ras oncogenesis. Protein engineering, utilizing various protein scaffolds such as antibodies, natural effectors and novel binding domains, offers alternative approaches to traditional small molecule drugs.

Experimental directed evolution and computational design, alone or in combination, have facilitated the development of high-affinity and specific protein inhibitors. Furthermore, the efficient intracellular delivery methods described above hold promise for targeted cancer therapies by effectively delivering Ras binders to their intracellular targets. These advancements challenge the perception of Ras as “undruggable” and provide hope for the development of effective treatments for various cancer types.

“These strategies should be utilized in future to examine the beneficial activity of Ras-binders and inhibitors and should further facilitate the development of protein-based Ras therapeutics.”

Click here to read the full review in Oncotarget.

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Novel GEM Model Unveils PLK1’s Role in Tumorigenesis

June 29, 2023

In a new editorial, researchers discuss a study using their team’s new genetically engineered mouse (GEM) model to assess PLK1 as a driver of oncogenic transformation.

Figure 1: The role of PLK1 in tumorigenesis and cancer heterogeneity. GEM Model

On the bright side, polo-like kinase 1 (PLK1) is considered a master regulator of the ever-important cell cycle. On the dark side, PLK1 expression (at both the mRNA and protein level) has shown to be upregulated in tumor cells, suggesting that PLK1 may also contribute to tumorigenesis. Despite this direct association, researchers studying the role of PLK1 in cancer have encountered a problem: a lack of appropriate animal models for experimentation.

“Even though studies have suggested that PLK1 contributes to tumorigenesis, the ability of PLK1 to drive oncogenic transformation on its own in vivo was still questionable due to a lack of sophisticated animal models for experimentation [18, 19].”

This problem may have been solved in 2021. In a new editorial paper, researchers Lilia Gheghiani and Zheng Fu from Virginia Commonwealth University discuss a recent study using their team’s new genetically engineered mouse (GEM) model to assess the ability of PLK1 to be a sole driver of oncogenic transformation in vivo. Their editorial was published in Oncotarget’s Volume 14 on June 27, 2023, and entitled, “The dark side of PLK1: Implications for cancer and genomic instability.”

PLK1 in Tumorigenesis

“To address this important scientific question, we generated a new genetically engineered mouse (GEM) model using the CAGGS (cytomegalovirus (CMV) early enhancer/chicken β-actin) promoter to drive exogenous PLK1 expression, allowing its ubiquitous and robust gene expression in transgenic mice [20].”

In an effort to determine if PLK1 overexpression causes tumors, the researchers created a new GEM mouse model that expresses high levels of PLK1. These high levels caused various types of spontaneous tumors. The increased PLK1 levels caused defects in cell division and resulted in abnormal numbers of centrosomes and compromised cell cycle checkpoints. This allowed for the accumulation of chromosomal instability, leading to abnormal numbers of chromosomes and tumor formation. In human cancers, higher PLK1 expression was associated with an increase in genome-wide copy number alterations. Their study provides evidence that abnormal PLK1 expression can trigger chromosomal instability and tumor formation, suggesting potential therapeutic opportunities for cancers with chromosomal instability.

“In summary, this study provides a novel GEM model that recapitulates the increased PLK1 expression observed in many human cancers and demonstrates that PLK1 overexpression drives spontaneous tumor formation in multiples organs in mouse, revealing the dark side of PLK1 as a potent proto-oncogene.”

Conclusions

In conclusion, the limitations of previous studies on PLK1 and its role in cancer have been partially addressed by the development of the new GEM model created by these researchers. This model allowed the team to examine PLK1’s ability to drive oncogenic transformation in vivo. Their study demonstrates that overexpression of PLK1 leads to the formation of spontaneous tumors in multiple organs, highlighting the dark side of PLK1 as a potent proto-oncogene. The findings of this study provide valuable insights into the role of PLK1 in tumorigenesis and suggest potential therapeutic opportunities for cancers associated with chromosomal instability. This breakthrough in animal models opens up new avenues for further research in understanding the mechanisms underlying PLK1-related tumorigenesis and developing targeted therapies to combat cancer.

“Alternative therapeutic strategies, such as co-delivery systems using nanoparticles or combination therapies, are under development in order to enhance the efficacy of PLK1 inhibition [25–28]. With expanding discoveries of PLK1 function and mechanisms of action, we hope that PLK1-targeted therapies will soon join the frontlines in the fight against cancer.”

Click here to read the full editorial paper in Oncotarget.

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New Study Reveals Genetic Risk Factors for Cancer in Saudi Arabia

June 16, 2023

In a new study, researchers found that 38.4% of a cohort in Saudi Arabia carried pathogenic variants linked to hereditary cancer risk.

New Study Reveals Genetic Risk Factors for Cancer in Saudi Arabia

Familial cancer is a fearsome reality for millions of people worldwide. While some cases of familial cancer syndrome (FCS) may be influenced by shared environmental or lifestyle factors within a family, others are solely due to genetic mutations passed down through generations. This problem is especially prevalent in Saudi Arabia—where rates of familial cancer are among the highest in the world.

“Cancer increased in the Kingdom of Saudi Arabia by 136% between 1999 and 2015 [4].”

Approximately 20% of all Saudi Arabian cancer patients have a family history of cancer. This population is likely to carry mutant alleles, presenting an opportunity for further exploration and research. By studying these individuals and their genetic profiles, scientists and healthcare professionals can gain valuable insights into the genetic factors contributing to familial cancer in the Saudi Arabian population. This knowledge can help improve risk assessment, develop targeted prevention strategies, and potentially lead to more effective treatments for familial cancer cases.

In a new study, researchers Musa AlHarbi, Nahla Ali Mobark, Wael Abdel Rahman AlJabarat, Hadeel ElBardis, Ebtehal AlSolme, Abdullah Bany Hamdan, Ali H. AlFakeeh, Fatimah AlMushawah, Fawz AlHarthi, Abdullah A. AlSharm, Ali Abdullah O. Balbaid, Naji AlJohani, Alicia Y. Zhou, Heather A. Robinson, Saleh A. Alqahtani, and Malak Abedalthagafi from King Fahad Medical City, Color Health Inc., University of Manchester, Johns Hopkins University, King Faisal Specialist Hospital and Research Center, and Emory University Hospital conducted a next-generation sequencing (NGS) assessment for hereditary cancer risk in a Saudi Arabian population. Their research paper was published in Oncotarget on June 12, 2023, entitled, “Investigating the prevalence of pathogenic variants in Saudi Arabian patients with familial cancer using a multigene next generation sequencing panel.”

The Study

The researchers used a 30-gene, targeted NGS panel to screen 310 subjects, including 57 non-cancer patients, 110 index patients with cancer and 143 of their relatives, 16 of whom also had cancer. (“Index patients” refers to individuals who are the first in a family to be diagnosed with a particular disease or condition of interest.) The NGS panel covered genes related to breast, ovarian, colorectal, endometrial, gastric, pancreatic, prostate, thyroid, renal, and skin cancers, as well as familiar adenomatous polyposis (FAP) and Lynch syndrome.

“This kit has been previously trialed as a means of capturing potential PVs [pathogenic variants] at a population level in Nigeria and the Caribbean, and in identifying rare variants in cancer patients who have tested negative for common cancer variants [35–38].”

The results showed that 119 subjects (38.4% of the cohort) carried pathogenic or likely pathogenic variants (PVs) affecting genes associated with hereditary cancer risk. (TP53, ATM, CHEK2, CDH1, CDKN2A, BRCA1, BRCA2, PALB2, BRIP1, RAD51D, APC, MLH1, MSH2, MSH6, PMS2, PTEN, NBN/NBS1, and MUTYH were identified as genes with pathogenic or likely pathogenic variants.) Among 126 patients and relatives with a history of cancer, 49 subjects (38.9%) carried pathogenic or likely pathogenic variants. Two specific variants (APC c.3920T>A and TP53 c.868C>T) were significantly associated with the occurrence of colorectal cancer/Lynch syndrome and multiple colon polyposis. Diverse variants in BRCA2, many of which were previously unreported as pathogenic, were found at a higher frequency in individuals with a history of cancer compared to the general patient population. Overall, these subjects had more genetic variants associated with familial cancers compared to other populations.

Conclusion

“In conclusion, this study is one of the first to report the prevalence of inherited cancer genetic variants in a cohort from the Arab world. Our study gives critical first insights into the genetic variants associated with overall cancer risk in this specific population, and specific forms including CRC/Lynch syndrome and breast cancer.”

The researchers concluded that their study was the first to use a comprehensive NGS panel for FCS risk assessment in Saudi Arabia and that it provided valuable insights into the genetic landscape of cancer in this population. They also acknowledged some limitations of their study, such as the small sample size, the lack of clinical data for some subjects and the possibility of false negatives due to technical or analytical issues. Overall, this study highlighted the importance of genetic testing and counseling for FCS in Saudi Arabia, where consanguineous marriages are common and may increase the risk of inheriting cancer-associated alleles from both parents. These findings also suggested that knowing the genetic profile of patients and their families could help tailor preventive strategies and treatments according to their specific risks.

“Whilst a larger population level study is still needed, we demonstrate that multigene NGS panel testing may serve as non-invasive diagnostic and cost-effective tool to predict familial cancer risk at the pre-clinical stage, allowing targeted screening and enabling early intervention.”

Click here to read the full research paper in Oncotarget.

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Can the Creatine Shuttle be Targeted to Fight Colorectal Cancer?

May 25, 2023

In a new study, researchers investigated the creatine shuttle pathway as a potential therapeutic target in colorectal cancer cells.

Can the Creatine Shuttle be Targeted to Fight Colorectal Cancer?

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Since the 1992 Barcelona Olympics, creatine supplementation has increased in popularity and grown to widespread use among the mainstream public. Creatine is a naturally occurring compound, primarily stored in skeletal muscle and involved in energy production for high-intensity activities—enhancing performance and supporting muscle growth and strength. The process by which creatine is transported into the muscles and utilized for energy production is referred to as the creatine shuttle. While it is a useful mechanism for healthy muscles, the creatine shuttle has also been implicated in cancer.

“The creatine shuttle is highlighted in cancer as a source of energy for cancer cells that display aggressive proliferation, and aberrant creatine kinase (CK) levels are known to be associated with many malignancies and mitotic control [7].”

In a new study, researchers Mayu Kita, Rina Fujiwara-Tani, Shingo Kishi, Shiori Mori, Hitoshi Ohmori, Chie Nakashima, Kei Goto, Takamitsu Sasaki, Kiyomu Fujii, Isao Kawahara, Ujjal Kumar Bhawal, Yi Luo, and Hiroki Kuniyasu from Nara Medical University, Saveetha University and Nantong University hypothesized that the creatine shuttle is involved in energy metabolism and other adenosine triphosphate (ATP) supply in cancer cells. On May 19, 2023, their new research paper was published in Oncotarget’s Volume 14, entitled, “Role of creatine shuttle in colorectal cancer cells.”

“In the current study, the role of the creatine shuttle in CRC [colorectal cancer] was analyzed along with its potential as a therapeutic target.”

The Creatine Shuttle in Colorectal Cancer

Despite advancements in treatment options for colorectal cancer (CRC), incidence and mortality rates remain high. The metabolism of CRC cells is distinctly different from that of normal cells, and understanding these metabolic alterations is crucial for devising new targeted therapies. The creatine shuttle system plays a pivotal role in cellular energy metabolism, particularly in high-energy demanding tissues such as muscle and brain. However, its involvement in CRC cells has remained largely unexplored until now.

Creatine kinase, also known as CK or creatine phosphokinase, is an enzyme that catalyzes the transfer of a phosphate group from creatine phosphate to adenosine diphosphate (ADP), thereby regenerating adenosine triphosphate (ATP), which is the primary energy source for cells. CK exists in different forms or isoenzymes. In this study, the researchers investigated the expression and role of creatine kinase B (CKB) and mitochondrial creatine kinase (MTCK) in CRC tissues. They also explored the inhibitory effect of dinitrofluorobenzene (DNFB) on CKB and MTCK activity and its impact on CRC cell growth, stemness, mitochondrial function, energy metabolism, and cancer metastasis.

Inhibition of the Creatine Shuttle

The team used tissue arrays to examine CKB and MTCK expression in CRC tissues. Both proteins were highly expressed in high-grade tumors and cases with distant metastasis. Liver metastases showed higher expression compared to primary tumors, suggesting a role in CRC progression and metastasis.

DNFB, an inhibitor of CK activity, reduced CK activity and inhibited cell growth in CT26 and HT29 CRC cell lines. HT29 cells, with higher CKB and MTCK levels, were less sensitive to DNFB than CT26 cells. DNFB treatment decreased cell number, stem cell marker expression and impaired sphere formation in CT26 and HT29 cells. Knockdown of CKB or MTCK showed similar effects, indicating specificity to CK inhibition. DNFB also inhibited mitochondrial function and energy metabolism, decreasing mitochondrial membrane potential, increasing ROS production, and reducing OCR and ATP production in both cell lines.

In a mouse model of peritoneal dissemination, pretreatment with DNFB reduced tumor growth. Excised tumors from DNFB-treated mice showed decreased proliferation and stem cell marker expression, as well as reduced phosphorylation levels of tumor-promoting signaling molecules (EGFR, AKT, and ERK1/2).

Summary & Conclusion

“In this study, we showed that inhibition of the creatine shuttle by blocking CKB and MTCK activity suppressed the growth, stemness, and metastasis of cancer. It was suggested that the cause of this is related to inhibition of both mitochondrial energy metabolism and the phosphorylation signaling system.”

This research study provides valuable insights into the role of CKB and MTCK in CRC and highlights the therapeutic potential of inhibiting the creatine shuttle in CRC treatment. Inhibition of CKB and MTCK activity by DNFB impaired CRC cell growth, stemness, mitochondrial function, energy metabolism, and cancer metastasis. These findings suggest that targeting the creatine shuttle pathway may represent a promising therapeutic strategy for CRC patients. Further studies are warranted to validate these findings and explore the potential of targeting the creatine shuttle in clinical settings.

“Our data suggest that the antitumor effect of creatine shuttle inhibition can be attributed to the inhibition of mitochondrial energy production as well as the inhibition of multiple phosphorylation signals through inhibition of the ATP supply. Therefore, it is necessary to develop a new CK inhibitor to induce these two effects in vivo.”

Click here to read the full research paper in Oncotarget.

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Oncotarget

Reaching the Brain Through the Groin: A Novel Approach to Brain Cancer

May 11, 2023

In a new editorial, researchers discuss opening the blood-brain barrier and a promising new strategy for the treatment of brain cancer.

Figure 1: A transfemoral path to BBB opening.

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Just a small number of molecules, including alcohol and caffeine, are able to cross the blood-brain barrier (BBB). The BBB is a highly selective semipermeable membrane that separates circulating blood from extracellular fluid in the brain. It plays a critical role in protecting the brain from harmful substances in the blood while also maintaining a stable and consistent environment for neuronal function. Without the BBB, humans would be at the mercy of any harmful toxin, pathogen and unwanted substance that could cross from the bloodstream into the brain.

This protective function also makes it difficult to deliver therapeutic agents to the brain, as the majority of drugs and other molecules are unable to cross the BBB. This is particularly problematic for the treatment of brain-localized diseases, including brain cancers and neurological disorders, which require high concentrations of drugs to effectively target sites in the brain. In a new editorial paper, researchers Thomas C. Chen, Weijun Wang and Axel H. Schönthal from the University of Southern California‘s Keck School of Medicine discuss a series of preclinical studies that introduced the novel concept of intraarterial (IA) injection of NEO100—a promising strategy aimed at temporarily and safely opening the BBB up for therapeutic treatment. Their editorial was published in Oncotarget’s Volume 14 on May 4, 2023, entitled, “From the groin to the brain: a transfemoral path to blood-brain barrier opening.”

“It is believed that procedures to open the BBB in a controlled and safe fashion might provide tremendous advantages by allowing optimal brain entry of any and all circulating therapeutics.”

Opening the BBB

The authors first describe previously used methods of opening the BBB for therapeutic intervention, including intracarotid injection of hyperosmolar mannitol and MRI-guided pFUS with intravascular microbubbles. Unfortunately, these methods have yielded issues with safety and efficacy. Fortunately, Chen, Wang, Schönthal, and their co-authors came up with a new idea for opening the BBB safely.

In a 2021 study, the researchers discovered that NEO100 enables the delivery of BBB-impermeable therapeutics to the brain. NEO100 is a type of perillyl alcohol—a natural chemical found in citrus fruit peels—that has been studied for its potential to treat cancer. Wang et al. aimed to see if injecting NEO100 into an artery would open the BBB safely and temporarily. This could help other drugs that are normally unable to pass through the BBB, such as methotrexate and therapeutic antibodies, to enter the brain. Previously, NEO100 had been administered through the nose to treat cancer, but this study focused on its ability to open the BBB.

The researchers injected NEO100 into the left ventricle of the heart and then injected a dye called Evans blue into the mice’s veins. Normally, this dye cannot penetrate the brain, but when the BBB is weakened or opened up, it can get through and turn the brain blue. And that’s exactly what happened—the mice’s brains turned blue after the injections. Interestingly, when they tried using another substance called mannitol, it did not have the same effect on the BBB. The team performed additional studies and found that NEO100 seemed to affect the connections between cells in the barrier.

In further experiments, the researchers used methotrexate and special markers that usually do not enter the brain. They gave these drugs and markers to mice and found that NEO100 made it easier for the drugs and markers to enter the brain. This effect lasted between two and four hours before the BBB reverted to normal functioning. The researchers also tested administering NEO100 by injecting it into the mouse’s veins, but this was not effective.

The main question the researchers wanted to answer was if opening the BBB using IA NEO100 could help treat brain tumors. To answer this question, they conducted experiments using mice that had tumor cells implanted in their brains. In one study, they used breast cancer cells that were engineered to have the protein HER2 and treated them with trastuzumab. In another study, they used models of brain cancer called melanoma and glioblastoma and treated them with drugs that help the immune system fight cancer. These studies have found a way to improve drug delivery for CNS diseases, but there are limitations that need further investigation.

Transfemoral IA catheterization

As noted in this editorial, the preclinical models above used one injection of NEO100 with a therapeutic agent, but it’s unclear if this will work as well in humans. Tumors in humans are more complex than in rodents, so multiple interventions might be needed. It is also important to determine the best way to perform the injection(s) in humans. The researchers suggest using a catheter inserted through the femoral artery near the groin and guided by fluoroscopy to safely inject NEO100 into the cranial arteries.

“Transfemoral IA catherization (Figure 1) is a low-risk procedure that is routinely performed by endovascular neurosurgeons in the context of cerebral angiograms, aneurysm coiling, tumor embolization, and thrombectomies [18]. It is considered ‘the gold standard technique for catheter-based neuro-interventions’ [19]. However, it has never been used as a means to access tumor-feeding cranial arteries for purposes of BBB opening.”

Transfemoral IA catheterization is a medical procedure that involves inserting a catheter through a blood vessel in the leg and guiding it to the brain to perform various treatments. It is a safe and common technique, already used by doctors who specialize in treating brain conditions. However, it has never been used to open the BBB in order to access the blood vessels. Using NEO100 with this procedure could be a new and innovative way to treat aggressive brain tumors. If necessary, the procedure could even be repeated multiple times due to its safe and simplistic nature. The researchers believe that using this new method to open the BBB could be just as successful in treating brain tumors as current treatments are for tumors in other parts of the body. This could potentially lead to better outcomes for patients with brain tumors, such as improved survival rates and fewer side effects.

Conclusions

The blood-brain barrier (BBB) is a protective barrier that prevents harmful substances from entering the brain. However, this barrier also makes it difficult to deliver therapeutic agents to the brain. In a new study, researchers have proposed a novel method of intraarterial injection of NEO100 to temporarily and safely open the BBB. This method has been shown to enable the delivery of BBB-impermeable therapeutics to the brain. The authors of this editorial have suggested using transfemoral IA catheterization to perform this intervention. The method requires further investigation and development.

“The authors envision that clinical implementation of this new BBB-opening method might achieve a similarly high rate of success in the treatment of brain-localized malignancies as do current treatments for peripherally distributed tumors; as a result, reduced morbidity and increased patient survival is expected.”

Click here to read the full editorial in Oncotarget.

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Oncotarget

Defining the Complexity of EGFR Endocytosis in Cancer

April 27, 2023

In a new editorial perspective, researchers delve into the complex mechanisms underlying EGFR endocytosis and its potential as a therapeutic target.

Figure 1: SNX3 protein downregulation in breast tumors.

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EGFR (epidermal growth factor receptor) is a crucial protein that plays a significant role in various biological processes such as cell growth, proliferation, differentiation, and survival. Dysregulation of EGFR signaling has been implicated in the development and progression of numerous human cancers, including lung, breast and colon cancer. Therefore, EGFR has emerged as an attractive target for cancer therapy, and several drugs that target EGFR are in clinical use or under investigation.

In recent years, endocytosis, the process by which cells internalize molecules and transport them into intracellular compartments, has emerged as a critical modulator of EGFR signaling. Endocytosis of EGFR not only regulates the duration and intensity of EGFR signaling but also modulates the signaling output. Dysregulation of EGFR endocytosis has been implicated in the development of drug resistance to EGFR-targeted therapies, highlighting the importance of understanding the mechanisms that regulate EGFR endocytosis.

In a new editorial perspective, researchers Aysegul Sapmaz and Ayse Elif Erson-Bensan from Middle East Technical University provide an overview of the recent advances in our understanding of EGFR endocytosis and its role in EGFR signaling and cancer. The authors highlight the importance of the dynamic interplay between EGFR endocytosis and downstream signaling pathways and discuss how aberrant EGFR endocytosis contributes to drug resistance to EGFR-targeted therapies. On April 10, 2023, their editorial perspective was published in Oncotarget’s Volume 14, entitled, “EGFR endocytosis: more than meets the eye.”

“Here we review the role of the EGF-SNX3-EGFR axis in breast cancers with an extended discussion on deregulated EGFR endocytosis in cancer.”

EGFR Endocytosis

In a recent 2022 study, Sapmaz, Erson-Bensan and their team made significant contributions to understanding the role of deregulated endocytosis in cancer by describing the tumor suppressor role of Sorting Nexin 3 (SNX3) in triple-negative breast cancers (TNBCs). SNX3 is a protein-coding gene belonging to a family of proteins called sorting nexins, which are involved in sorting and trafficking of cellular membrane proteins and lipids. At the conclusion of their study, the researchers found that SNX3 is a critical player in TNBCs through the EGF-SNX3-EGFR axis.

“SNX3, an endosomal trafficking protein, is an emerging tumor suppressor in breast cancers as a target of the EGFactivated EGFR pathways and a modulator of EGFR protein levels.”

In the current editorial perspective by Sapmaz and Erson-Bensan, they discuss overexpression of EGFR and its activating mutations linked to various cancer phenotypes, including stemness, metastasis and drug resistance. Endocytosis and the internalization of EGFR play a crucial role in regulating its activity, which is dependent on post-translational modifications and regulated by various proteins, including ubiquitin. Deregulation of these players in endocytic processes has significant implications for EGFR activity in cancers. The ubiquitination status of EGFR and other proteins in the endocytic pathway is functionally essential and is balanced by E3 ubiquitin ligases and deubiquitinating enzymes (DUBs). Targeting these enzymes to alter ubiquitination dynamics could offer future perspectives in manipulating EGFR endocytosis and signaling in cancers.

The researchers discuss the non-canonical functions of endocytosis and endocytosis-related proteins, such as their involvement in nucleocytoplasmic shuttling and transcriptional activity. Several endocytic proteins have been found to interact with nuclear proteins and modulate gene transcription. Examples include EPS15, EPN1 and RNF11, which can shuttle between the cytoplasm and nucleus and have been shown to positively regulate transcription. Other endocytic proteins and adaptors have also been found to shuttle between the cytoplasm and nucleus with functions in endocytosis and gene expression. The authors emphasize the need for a better understanding of both the canonical and non-canonical functions of endocytic processes for normal physiology and diseases, including cancer and other pathologies.

“A better understanding of these backstage mechanisms will allow a more comprehensive understanding of receptor fate and activity.”

Conclusions

In conclusion, EGFR and its regulation through endocytosis have emerged as critical players in cancer development and progression. Dysregulation of EGFR endocytosis has been implicated in drug resistance to EGFR-targeted therapies, highlighting the importance of understanding the mechanisms that regulate this process. Recent advances in our understanding of EGFR endocytosis and its role in cancer have revealed the critical interplay between EGFR signaling and downstream pathways. The research by Sapmaz and Erson-Bensan sheds light on the tumor suppressor role of SNX3 in TNBCs and highlights the need for a better understanding of the canonical and non-canonical functions of endocytic processes in normal physiology and diseases, including cancer. Future research focusing on manipulating EGFR endocytosis and signaling could offer new perspectives on cancer therapy.

“Finally, before we can consider key endocytosis regulators as therapeutic targets, these candidate proteins must also be evaluated within the context of potential feedback mechanisms to modulate the biosynthesis and repopulation of receptors in cancer cells.”

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