BUFFALO, NY - June 4, 2025 – A new #research paper was #published in Volume 16 of Oncotarget on May 20, 2025, titled “Targeting PCNA/AR interaction inhibits AR-mediated signaling in castration resistant prostate cancer cells."

In this study, authors Shan Lu and Zhongyun Dong from the University of Cincinnati College of Medicine investigated how interfering with a protein interaction could reduce prostate cancer growth. Their study based on prostate cancer cells shows that blocking the link between PCNA, a protein important for DNA repair, and the androgen receptor (AR), which drives prostate cancer growth, can slow down cancer cell multiplication. This discovery could lead to a new treatment for patients with advanced prostate cancer, particularly those no longer responding to hormone therapy.

Prostate cancer is one of the most common cancers in men. Many patients eventually become resistant to hormone treatment. In this advanced stage, called castration-resistant prostate cancer (CRPC), tumors continue to grow by using either the full-length androgen receptor (AR-FL) or altered versions called AR variants (AR-Vs). This study shows that the interaction between AR and PCNA helps both AR-FL and AR-Vs remain active, supporting cancer cell survival and growth.

The researchers identified a new region in the AR that binds to PCNA. They developed a small peptide, R9-AR-PIP, to mimic this region and block the AR-PCNA connection. They found that this peptide reduced AR’s ability to bind DNA and lowered the levels of key genes involved in cancer cell growth. Importantly, the peptide was effective against both types of AR, including the variant forms that are especially challenging in CRPC.

“We identified a second PIP-box (PIP-box592) in the DNA binding domain of AR and found that dihydrotestosterone enhances the binding of full-length AR (AR-FL) but not a constitutively active variant (AR-V7) to PCNA.”

They also tested a small molecule, PCNA-I1S, which interferes with PCNA’s ability to move to the cell nucleus and interact with AR. This molecule showed similar effects as the peptide, reducing AR activity and stopping cancer cell growth. Together, these findings suggest that targeting PCNA/AR interactions could be a promising strategy to fight CRPC, especially in patients with limited treatment options.

One key result was that both the peptide and the small molecule reduced the levels of cyclin A2, a protein that helps cells divide and is often overexpressed in CRPC. Since this protein is linked to patients' poor outcomes, its reduction could be especially beneficial.

This study improves our understanding of how prostate cancer continues to grow even after hormone treatments fail. By blocking a crucial helper of the androgen receptor, researchers have uncovered a new way to potentially slow or stop the disease. Further studies in animal models are needed, but this approach could lead to more effective treatments for men with advanced prostate cancer.

DOI - https://doi.org/10.18632/oncotarget.28722

Correspondence to - Zhongyun Dong - dongzu@ucmail.uc.edu

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Keywords - cancer, PCNA, androgen receptor, PCNA inhibitors, AR splicing variants, CRPC

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Oncotarget

Targeting PCNA-Androgen Receptor Interaction Suppresses Prostate Cancer Cell Growth

In this episode Peng Yin discusses his new book,  Persisting in the Good: Thomas Aquinas and early Chinese Ethics, with Chloë Starr.  They talk about moral development and what it means to be good in the thinking Mencius, Xunzi and Laozi—and how these interact with Aquinas’ thought, as well as historic European readings of Chinese philosophy.

Peng Yin, Persisting in the Good

In this episode Alex Chow discusses his new edited book, Chinese Heritage in British Christianity: more than foreigners, with Chloë Starr. They talk about the history of the Chinese church in the UK, Chinese heritage in British Christianity, and the diversity of Chinese-speaking congregations today. 

Alex Chow, Chinese Heritage in British Christianity

In this episode Naomi Thurston discusses her new book, Moltmann in China: Reception and Dialogue, with Chloë Starr. They discuss the reception of Moltmann’s theology—from despair and hope to eco-theology—among Chinese scholars, and Moltmann’s own forays into comparative work with his studies of the Daodejing. 

Naomi Thurston, Moltmann in China

In this episode Jesse Zixi Sun discusses his new book, Salvation and Revolution: A Twentieth Century Odyssey of the Chinese Protestant Mind, with Chloë Starr. They discuss the relationship between national modernization and religious salvation in China, and the disproportionate civic and social engagement of Christian intellectuals in national life in the early twentieth century.

Jesse Sun, Salvation and Revolution

Dr. Josh Mitteldorf summarizes his #research perspective #published in Volume 17, Issue 5 of Aging (Aging-US), titled “Methylation clocks for evaluation of anti-aging interventions.”

DOI - https://doi.org/10.18632/aging.206245

Corresponding author - Josh Mitteldorf - aging.advice@gmail.com

Author interview - https://www.youtube.com/watch?v=efgNvr5ezTk

Video short - https://www.youtube.com/watch?v=YjUvpqMzCGc

Abstract

Methylation clocks have found their way into the community of aging research as a way to test anti-aging interventions without having to wait for mortality statistics. But methylation is a primary means of epigenetic control, and presumably has evolved under strong selection. Hence, if methylation patterns change consistently at late ages it must mean one of two things. Either (1) the body is evolved to destroy itself (with inflammation, autoimmunity, etc.), and the observed methylation changes are a means to this end; or (2) the body detects accumulated damage, and is ramping up repair mechanisms in a campaign to rescue itself. My thesis herein is that both Type 1 and Type 2 changes are occurring, but that only Type 1 changes are useful in constructing methylation clocks to evaluate anti-aging interventions. This is because a therapy that sets back Type 1 changes to an earlier age state has stopped the body from destroying itself; but a therapy that sets back Type 2 changes has stopped the body from repairing itself. Thus, a major challenge before the community of epigenetic clock developers is to distinguish Type 2 from Type 1. The existence of Type 1 epigenetic changes is in conflict with conventional Darwinian thinking, and this has prompted some researchers to explore the possibility that Type 1 changes might be a form of stochastic epigenetic drift. I argue herein that what seems like directed epigenetic change really is directed epigenetic change. Of five recent articles on “stochastic methylation clocks,” only one (from the Conboy lab) is based on truly stochastic changes. Using the Conboy methodology and a methylation database, I construct a measure of true methylation drift, and show that its correlation with age is too low to be useful.

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Keywords - aging, methylation, stochastic, entropy, programmed aging, aging clock, epigenetic clock

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Aging (Aging-US)

Behind the Study: Using Methylation Clocks to Evaluate Anti-Aging Interventions

BUFFALO, NY – June 20, 2025 – A new #review was #published in Volume 16 of Oncotarget on June 10, 2025, titled “Beyond DNA damage response: Immunomodulatory attributes of CHEK2 in solid tumors.”

In this paper, led by first author Helen Qian and corresponding author Crismita Dmello from Northwestern University Feinberg School of Medicine, researchers compiled growing evidence that the CHEK2 gene, long known for its role in repairing DNA damage, may also influence how tumors respond to immunotherapy. Their analysis suggests that problems in CHEK2 function might make cancer cells more vulnerable to immune system attacks, highlighting a new opportunity to improve treatment outcomes in solid tumors.

Immune checkpoint inhibitors (ICIs) have transformed cancer treatment; however, they are effective in only a subset of patients. This review suggests that tumors with reduced CHEK2 activity may accumulate more mutations that produce signals the immune system can recognize. These signals, known as neoantigens, help immune cells identify and destroy cancer cells more effectively. The review connects this process not only to CHEK2’s established role in the DNA damage response but also to a newly proposed function in shaping the immune environment of tumors.

CHEK2 normally helps maintain genomic stability by enabling precise DNA repair. When this function is lost, cells rely on more error-prone repair methods, leading to additional mutations. These mutations can increase tumor mutational burden, which has been linked to better outcomes with immunotherapy. Beyond DNA repair, the review highlights a second mechanism: activation of the cGAS-STING pathway. This pathway detects fragments of damaged DNA and triggers inflammation that attracts immune cells to the tumor.

The authors highlight studies where CHEK2-deficient tumors responded better to PD-1 inhibitors, a common type of immune checkpoint inhibitor. In both lab models and early-stage clinical settings, CHEK2 loss was associated with increased infiltration of CD8+ T cells—immune cells essential for attacking cancer cells. In cancers such as glioblastoma and renal cell carcinoma, which are typically resistant to immunotherapy, reduced CHEK2 expression was linked with more favorable immune activity and higher expression of interferon-related genes.

The compiled evidence points to CHEK2 as a potential biomarker for identifying patients likely to respond to immunotherapy. In addition, combining CHEK2 inhibitors with existing immunotherapies may enhance anti-tumor effects, particularly in cancers with limited treatment options. The review notes that some clinical trials using the CHEK1/2 inhibitor prexasertib alongside immune checkpoint therapies have already shown promising early results.

“The initial results from this Phase I clinical trial support the immunomodulatory role of CHEK2 expression and even suggest CHEK2 potentiates immunosuppression.”

Although more research is needed to confirm these mechanisms and improve treatment approaches, this review underscores the expanding role of DNA repair genes like CHEK2—not only in maintaining genome integrity but also in helping the immune system fight cancer.

DOI - https://doi.org/10.18632/oncotarget.28740

Correspondence to - Crismita Dmello - stellacpak@outlook.com

Video short - https://www.youtube.com/watch?v=C26pEBc0itk

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CHEK2 Identified as a Potential Target to Improve Immunotherapy in Solid Tumors

BUFFALO, NY — June 24, 2025 — A new #research paper was #published in Aging (Aging-US) Volume 17, Issue 5, on May 20, 2025, titled “Short-term moderate caloric restriction in the rhesus macaque attenuates markers of ovarian aging in select populations.”

In this study, led by first author Emma S. Gargus and corresponding author Francesca E. Duncan from Feinberg School of Medicine at Northwestern University, researchers explored how dietary changes impact ovarian aging in female rhesus macaques. They found that a three-year moderate reduction in caloric intake preserved a youthful distribution of ovarian follicles and reduced age-related tissue stiffness. These findings are relevant to women’s health as they suggest that caloric restriction (CR) may help delay the decline in reproductive function associated with aging.

Ovarian aging, which leads to reduced fertility and hormone production, is one of the earliest signs of aging in women. This study investigated whether a 30% reduction in caloric intake could protect the ovaries from age-related damage in nonhuman primates (NHP), whose reproductive biology closely mirrors that of humans. Ovaries were collected from young (10–13 years) and old (19–26 years) rhesus macaques who were either on a diet of moderate caloric restriction or a control diet for three years.

“To test the effect of CR on follicle number, follicles were analyzed in histological sections from animals across experimental cohorts: Young Control, Young CR, Old Control, Old CR (n = 4–8/group).”

Although total follicle numbers still declined with age, caloric restriction helped maintain the types of follicles most associated with reproductive potential. In older monkeys who were still cycling, even if irregularly, caloric restriction preserved more primordial follicles, the key indicators of ovarian reserve, than in those on a normal diet.

The benefits of caloric restriction were also seen in the structure of ovarian tissue. Normally, aging leads to fibrosis, a stiffening of the ovarian environment caused by increased collagen and decreased hyaluronic acid. This study showed that caloric restriction reduced this fibrotic process, suggesting a more supportive environment for maintaining reproductive health.

While the diet did not stop the overall loss of follicles with age, it improved the proportion of younger, more viable follicles in aging ovaries. The timing of the dietary intervention also appeared to matter. Positive effects were more noticeable in older animals with irregular cycles than in those who had completely stopped cycling. This indicates that starting caloric restriction at a certain point in the reproductive lifespan may yield the best results.

This research is an important step to identifying lifestyle-based strategies that can extend reproductive longevity. Although further studies are needed to test these findings in humans, the work supports the potential of moderate dietary changes to delay ovarian aging and help preserve fertility later in life.

DOI - https://doi.org/10.18632/aging.206253

Corresponding author - Francesca E. Duncan - f-duncan@northwestern.edu

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Moderate Caloric Restriction May Slow Ovarian Aging in Primates

BUFFALO, NY – June 24, 2025 – A new precision #oncology paper was #published in Volume 16 of Oncotarget on June 17, 2025, titled “Case Report WIN-MTB-2023001 WIN International Molecular Tumor Board A 62-year-old male with metastatic colorectal cancer with 5 prior lines of treatment.”

In this report, led by Alberto Hernando-Calvo from Vall d’Hebron University Hospital and Vall d’Hebron Institute of Oncology; Razelle Kurzrock from WIN Consortium and Medical College of Wisconsin; Oncotarget Editor-in-Chief Wafik S. El-Deiry from WIN Consortium and Legorreta Cancer Center at Brown University; and corresponding author Shai Magidi, also from WIN Consortium, along with colleagues, describe the case of a 62-year-old man with metastatic colorectal cancer who underwent multiple lines of therapy. After analysis, the WIN International Molecular Tumor Board proposed different personalized treatment plans based on the tumor’s unique genetic mutations. This case highlights the growing role of precision oncology in guiding therapies for patients with treatment-resistant cancers.

Colorectal cancer is one of the deadliest cancers worldwide, and managing advanced cases remains a significant challenge. This patient had already received five prior treatment regimens, including chemotherapy and targeted therapies. Although some treatments were initially beneficial, the cancer eventually developed resistance. Molecular analysis revealed key mutations in genes such as BRAF, MET, APC, TP53, and NRAS, which are often linked to aggressive tumor behavior and reduced treatment effectiveness.

With limited standard options left, the patient’s case was presented and reviewed by the WIN International Molecular Tumor Board, a global panel of cancer experts. The team analyzed the clinical history and genetic profile to design new treatment approaches. These involved off-label drug combinations tailored to the specific mutations found in the tumor. For example, one approach combined trametinib, a drug that blocks cancer cell growth signals, with amivantamab, an antibody that attacks cancer-related proteins MET and EGFR, and regorafenib, which helps cut off blood supply to tumors and may counteract effects from APC and TP53 mutations.

“Another option was trametinib at 1 mg daily, cetuximab (EGFR antibody), 250 mg/m² IV every two-weeks, and cabozantinib (MET and VEGFR inhibitor), 40 mg po daily.”

This case reflects a shift in cancer care from standardized protocols to precision approaches, where therapy is selected based on a tumor’s molecular features. Such strategies aim to delay resistance and slow disease progression more effectively. The WIN International Molecular Tumor Board also discussed practical challenges, including access to medications, combining off-label drugs, and the difficulties of enrolling patients in clinical trials after multiple prior treatments.

Although the ultimate treatment decision remained with the patient’s physician, this report shows how international collaboration and precision oncology can expand options for patients facing limited alternatives. It also emphasizes the value of repeat genetic analysis during disease progression to monitor new mutations in the tumor that may impact treatment.

While the patient ultimately died from cancer progression, this case serves as a model for how molecular analysis and expert input can be used to guide treatment even in complex and metastatic colorectal cancer. As personalized cancer strategies continue to evolve, they may offer potential pathways for patients who have exhausted standard treatment options.

DOI - https://doi.org/10.18632/oncotarget.28744

Correspondence to - Shai Magidi - shai.magidi@winconsortium.org

Video short - https://www.youtube.com/watch?v=uWDtWNgpK7A

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WIN International Molecular Tumor Board Recommends Tailored Treatment for Advanced Colorectal Cancer

BUFFALO, NY — June 25, 2025 — A new #research paper was #published in Aging (Aging-US) Volume 17, Issue 5, on May 28, 2025, titled “Investigating telomere length in progeroid syndromes: implications for aging disorders.”

In this study, led by first author Luma Srour and corresponding authors Yosra Bejaoui and Nady El Hajj, from Hamad Bin Khalifa University, Qatar Foundation, researchers investigated whether shortened telomeres, a marker of cellular aging, are present across various rare genetic disorders that mimic early aging, known as progeroid syndromes. The study found that telomere shortening, also called telomere attrition, is not a shared characteristic of all these disorders. This finding is important because it challenges the belief that telomere loss is a common thread in premature aging and could help refine how these syndromes are studied and treated.

Progeroid syndromes are rare conditions that cause individuals to display symptoms of aging far earlier than expected. While some of these syndromes share signs of typical aging, others arise from very different genetic alterations. Researchers focused on comparing telomere length in individuals with several of these syndromes to better understand how aging develops at the cellular level. Telomeres are protective ends of chromosomes that shorten as cells divide, acting as a biological clock linked to aging and disease.

Using DNA methylation data from blood samples, the team analyzed telomere length in patients with six progeroid syndromes: Werner Syndrome, Hutchinson-Gilford Progeria Syndrome, Berardinelli-Seip Congenital Lipodystrophy type 2, Dyskeratosis Congenita, Cerebroretinal Microangiopathy with Calcifications and Cysts, and Wiedemann-Rautenstrauch Syndrome. They found significant telomere shortening only in classical Werner Syndrome, Berardinelli-Seip Congenital Lipodystrophy type 2, and Dyskeratosis Congenita. Other syndromes, including the widely studied Hutchinson-Gilford Progeria Syndrome, did not show this pattern.

“To investigate whether progeroid syndromes have telomere attrition, we calculated telomere length using the DNAmAge web-based calculator.”

The findings suggest that telomere shortening cannot be used as a universal marker for all forms of premature aging. In fact, some syndromes linked to DNA repair problems showed telomere damage, while others with different genetic mutations did not. These results indicate that the underlying biology of each syndrome is crucial in determining whether telomere shortening plays a role. Researchers also compared telomere lengths in people with genetic variants known to protect against age-related diseases. Those with protective genes had longer telomeres than people with progeroid syndromes.

This study challenges assumptions about aging in rare disorders and highlights the need for more personalized approaches in aging research. By identifying which syndromes involve telomere attrition, it opens new avenues for treating or delaying aging-related symptoms. Future research may explore other biological factors behind premature aging and how genetic differences influence the aging process.

DOI - https://doi.org/10.18632/aging.206255

Corresponding authors - Yosra Bejaoui - yob4003@qatar-med.cornell.edu, and Nady El Hajj - nelhajj@hbku.edu.qa

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New Research Finds Telomere Shortening Not Consistent Across Premature Aging Disorders

Recent discoveries in #aging research reveal a powerful insight: the biological changes that lead to chronic #diseases begin far earlier than most people realize—often in midlife, well before symptoms appear. This early phase offers a valuable opportunity for prevention. As highlighted in a recent editorial by Marco Demaria, Editor-in-Chief of Aging and a researcher at the European Research Institute for the Biology of Ageing (ERIBA), University Medical Center Groningen, and the University of Groningen (RUG), the aging process itself – not just the diseases it produces – can and should be a primary focus of healthcare. 

The Problem with Traditional Medicine

While modern healthcare has extended lifespan and improved treatment for many diseases, it tends to be insufficient in addressing the complex needs of aging populations. Older individuals frequently experience multiple chronic conditions simultaneously, such as cardiovascular disease, diabetes, cancer, and neurodegenerative disorders. This state of multimorbidity complicates care, increases the use of multiple medications, and reduces quality of life. The dominant traditional healthcare system, which typically begins only after symptoms appear, is costly and insufficient for addressing the interconnected nature of these conditions.

A New Model for Healthcare: Insights from the Editorial

In his recent editorial, “Rethinking healthcare through aging biology,” published in Aging Volume 17, Issue 5, Dr. Demaria outlines a shift from disease-specific treatment to targeting the biological mechanisms of aging itself, a more integrated and forward-looking approach. He presents three evolving healthcare models.

Full blog - https://aging-us.org/2025/06/a-new-vision-for-healthcare-addressing-aging-before-disease-begins/

Paper DOI - https://doi.org/10.18632/aging.206262

Corresponding author - Marco Demaria - m.demaria@umcg.nl

Video short - https://www.youtube.com/watch?v=xR-16cjHnQY

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Keywords - aging, healthcare, senolytics, epigenetics, medical education

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A New Vision for Healthcare: Addressing Aging Before Disease Begins

Oncotarget is a primarily oncology-focused, peer-reviewed, open access journal. Papers are published continuously within yearly volumes in their final and complete form and then quickly released to Pubmed.

Oncotarget is now indexed by MEDLINE, PubMed and PMC/PubMed.

Read about the Oncotarget Scientific Integrity Process: https://www.oncotarget.com/scientific_integrity/

Targeting PCNA-Androgen Receptor Interaction Suppresses Prostate Cancer Cell Growth

Oncotarget Podcast