BUFFALO, NY- March 6, 2024 – A new #research paper was #published in Aging (listed by MEDLINE/PubMed as "Aging (Albany NY)" and "Aging-US" by Web of Science) Volume 16, Issue 4, entitled, “Exploring the effects of Dasatinib, Quercetin, and Fisetin on DNA methylation clocks: a longitudinal study on senolytic interventions.”

Senolytics, small molecules targeting cellular senescence, have emerged as potential therapeutics to enhance health span. However, their impact on epigenetic age remains unstudied. In this new study, researchers Edwin Lee, Natàlia Carreras-Gallo, Leilani Lopez, Logan Turner, Aaron Lin, Tavis L. Mendez, Hannah Went, Alan Tomusiak, Eric Verdin, Michael Corley, Lishomwa Ndhlovu, Ryan Smith, and Varun B. Dwaraka from the Institute For Hormonal Balance, TruDiagnostic, Buck Institute for Research on Aging, and Cornell University aimed to assess the effects of senolytic treatments on DNA methylation (DNAm), epigenetic age, and immune cell subsets. 

“[...] this study aims to comprehensively assess the impact of senolytic drugs on epigenetic aging through two longitudinal studies to address our research objective. The initial investigation focuses on a combination treatment of Dasatinib and Quercetin, while the subsequent phase incorporates Fisetin into the treatment regimen.”

In a Phase I pilot study, 19 participants received Dasatinib and Quercetin (DQ) for 6 months, with DNAm measured at baseline, 3 months, and 6 months. Significant increases in epigenetic age acceleration were observed in first-generation epigenetic clocks and mitotic clocks at 3 and 6 months, along with a notable decrease in telomere length. However, no significant differences were observed in second and third-generation clocks. 

Building upon these findings, a subsequent investigation evaluated the combination of DQ with Fisetin (DQF), a well-known antioxidant and antiaging senolytic molecule. After one year, 19 participants (including 10 from the initial study) received DQF for 6 months, with DNAm assessed at baseline and 6 months. Remarkably, the addition of Fisetin to the treatment resulted in non-significant increases in epigenetic age acceleration, suggesting a potential mitigating effect of Fisetin on the impact of DQ on epigenetic aging. 

“Furthermore, our analyses unveiled notable differences in immune cell proportions between the DQ and DQF treatment groups, providing a biological basis for the divergent patterns observed in the evolution of epigenetic clocks. These findings warrant further research to validate and comprehensively understand the implications of these combined interventions.”

DOI - https://doi.org/10.18632/aging.205581

Corresponding authors - Varun B. Dwaraka - varun@trudiagnostic.com

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About Aging-US

Launched in 2009, Aging-US publishes papers of general interest and biological significance in all fields of aging research and age-related diseases, including cancer—and now, with a special focus on COVID-19 vulnerability as an age-dependent syndrome. Topics in Aging-US go beyond traditional gerontology, including, but not limited to, cellular and molecular biology, human age-related diseases, pathology in model organisms, signal transduction pathways (e.g., p53, sirtuins, and PI-3K/AKT/mTOR, among others), and approaches to modulating these signaling pathways.

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Aging (Aging-US)

A Longitudinal Study on Dasatinib, Quercetin, and Fisetin Senolytic Interventions

BUFFALO, NY – August 29, 2025 – A new #research paper was #published in Volume 16 of Oncotarget on August 29, 2025, titled “In vivo manipulation of the protein homeostasis network in rhabdomyosarcoma.”

In this study led by first author Kristen Kwong and corresponding author Amit J. Sabnis from the Department of Pediatrics, Division of Oncology, University of California San Francisco, researchers discovered that disrupting the protein quality control system in cancer cells slows tumor growth in rhabdomyosarcoma (RMS), the most common pediatric soft tissue cancer. This finding points to a new strategy for treating high-risk childhood cancers that often resist current therapies.

Rhabdomyosarcoma is a rare and aggressive cancer that primarily affects children and adolescents. Standard treatments like chemotherapy and radiation often have limited long-term success in high-risk cases. This study explored a different approach: targeting the cellular machinery that maintains protein quality, known as the proteostasis network. Cancer cells rely heavily on this system to survive stress caused by rapid growth and genetic instability.

“To examine whether MAL3-101 or more drug-like proteostasis inhibitors represent a new therapeutic strategy for RMS, we screened proteostasis components that might recapitulate the effects of MAL3-101 in vivo.”

The researchers first used a compound called MAL3-101 to disrupt protein control in RMS cells. They then identified which parts of the protein quality system were affected. Based on those findings, they searched for more drug-like compounds that could target the same pathways. 

They focused on a protein called p97, which plays a critical role in removing damaged or misfolded proteins. When they blocked p97 using a drug called CB-5083, the cancer cells could no longer manage internal stress and began to self-destruct. In both laboratory models and mice implanted with human RMS tumors, the treatment significantly slowed or stopped tumor growth. The drug triggered a stress response in the cells known as the unfolded protein response, which can lead to either recovery or programmed cell death.

However, not all tumors responded the same way. Some resisted the treatment by activating a backup system called autophagy, which allows cells to recycle parts of themselves under stress. By comparing tumors that responded well to those that did not, the researchers found that higher autophagy activity could serve as a warning sign for resistance. This insight may help identify which patients are more likely to benefit from therapies that target protein quality control.

While the results are promising, the drug’s effectiveness depended on the tumor’s genetic profile and how it handled stress. Combining p97 inhibition with other treatments or blocking alternative survival pathways like autophagy may improve outcomes. The researchers also noted the importance of developing safer and more targeted drugs to reduce side effects.

This study opens new possibilities for personalized cancer treatment, particularly for children with aggressive or relapsed RMS. By weakening the systems that cancer cells depend on to survive, rather than only using toxic treatments to kill them, scientists aim to develop more effective and less harmful therapies for young patients.

DOI - https://doi.org/10.18632/oncotarget.28764

Correspondence to - Amit J. Sabnis - amit.sabnis@ucsf.edu

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

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Oncotarget

Blocking Protein Control Pathway Slows Rhabdomyosarcoma Growth in Mice

BUFFALO, NY — September 2, 2025 — A new #research paper featured on the #cover of Volume 17, Issue 8 of Aging (Aging-US) was #published on July 30, 2025, titled “Exosomes released from senescent cells and circulatory exosomes isolated from human plasma reveal aging-associated proteomic and lipid signatures.”

In this study, led by first authors Sandip Kumar Patel and Joanna Bons, along with corresponding author Birgit Schilling from The Buck Institute for Research on Aging, researchers found that exosomes—tiny particles released by cells—carry molecular signatures that indicate both biological aging and cellular senescence. These signatures include proteins, lipids, and microRNAs associated with inflammation, oxidative stress, and tissue remodeling. The findings could enhance our understanding of biological aging and help in developing future anti-aging therapies.

Senescence is a state in which cells stop dividing but remain metabolically active. These cells often release harmful substances, known collectively as the senescence-associated secretory phenotype (SASP), that can affect nearby tissues. This study shows that exosomes are an important component of this secretory profile.

The researchers analyzed exosomes from senescent human lung cells and from the blood plasma of both young and older adults. They identified over 1,300 proteins and 247 lipids within these particles. Many of these molecules were significantly altered with age.

“In parallel, a small human plasma cohort from young (20–26 years) and old (65–74 years) individuals revealed 1,350 exosome proteins and 171 plasma exosome proteins were altered in old individuals.”

Exosomes from older individuals contained more inflammation-related proteins and fewer antioxidants, while those from senescent cells showed lipid changes associated with membrane integrity and cellular stress. These changes suggest that exosomes may play a role in spreading senescence to nearby cells, a process known as secondary senescence.

The study also identified distinct patterns in microRNAs—small molecules that regulate gene expression—found in the blood of older adults. Some of these, including miR-27a and miR-874, have previously been associated with cognitive decline and chronic illnesses, highlighting their potential as biomarkers for biological aging.

Although the study involved a limited number of samples, it provides strong early evidence that exosomes reflect the molecular changes associated with aging. By showing how these particles carry and possibly spread aging-related signals throughout the body, the research opens new possibilities for diagnosing and treating age-related diseases.

DOI - https://doi.org/10.18632/aging.206292

Corresponding author - Birgit Schilling – bschilling@buckinstitute.org

Video short - https://www.youtube.com/watch?v=tcyAZahw-g8

Keywords - aging, proteomics, senescence, exosomes, data-independent acquisitions

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New Study Links Exosomes to Biological Aging

BUFFALO, NY — September 4, 2025 — A new #research perspective was #published  in Volume 17, Issue 8 of Aging (Aging-US) on August 16, 2025, titled “Age-related diseases as a testbed for anti-aging therapeutics: the case of idiopathic pulmonary fibrosis.”

In this research perspective, Alex Zhavoronkov, Dominika Wilczok, Feng Ren, and Fedor Galkin, from Insilico Medicine, Buck Institute for Research on Aging, and Duke University, propose a new method to evaluate age-related diseases based on how closely they align with the biological processes of aging. Their analysis shows that idiopathic pulmonary fibrosis (IPF), a progressive lung condition, is one of the diseases most strongly associated with aging. This makes IPF a promising model for testing new anti-aging therapies with the potential to treat multiple age-related conditions.

“This perspective explores how aging-related diseases (ARDs) can serve as experimental platforms for discovering new geroprotective interventions.”

While many age-related diseases are used as models for aging research, not all accurately reflect the biology of aging. To address this, the authors developed a scoring system that measures how closely a disease is connected to the key hallmarks of aging, such as inflammation, genetic instability, and impaired cellular repair. Using this system, they evaluated 13 common age-related diseases and found that IPF had a particularly high overlap with aging biology.

IPF is a chronic disease that causes scarring in the lungs and a rapid decline in lung function. In contrast to the gradual loss of function seen in normal aging, IPF progresses more than five times faster. The authors highlight that IPF shares nearly all of the biological features associated with aging. These similarities make IPF a strong candidate for studying aging and testing therapies that target its underlying causes.

The authors also discuss different therapies currently being developed for IPF that are also designed to address aging itself. These include drugs that clear senescent cells, activate telomerase to maintain chromosome health, or repair damaged signaling between cells. Some of these treatments, such as senolytic combinations and AI-discovered compounds like rentosertib, are already showing early promise in preclinical or clinical trials.

In addition, the authors point out that IPF’s fast progression and clearly measurable outcomes offer an advantage for clinical testing. If a therapy proves effective in IPF, it may also be useful for other conditions that share similar aging-related mechanisms, including diabetes, arthritis, and heart disease. This approach could accelerate drug development and reduce costs by focusing on therapies that target shared biological pathways.

Overall, this perspective supports a shift in pharmaceutical research toward treating aging as an underlying cause of many chronic diseases. By positioning IPF as a model for aging-related drug development, the authors propose a strategic pathway for testing and expanding anti-aging therapies across a wide range of health conditions.

DOI - https://doi.org/10.18632/aging.206301

Corresponding author - Alex Zhavoronkov – alex@insilico.com

Video short - https://www.youtube.com/watch?v=p5ur7itzvSI

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Idiopathic Pulmonary Fibrosis Identified as a Model for Anti-Aging Drug Development

As the global population grows older, understanding what drives the aging process is becoming increasingly important. Diseases like Alzheimer’s, cardiovascular conditions, and cancer are more common with age, yet many current treatments only manage symptoms rather than addressing the underlying biological causes.

One contributor to aging is the buildup of “senescent” cells—cells that have stopped dividing but do not die. These cells can harm nearby tissues by releasing molecular signals, a process known as secondary senescence.

Scientists have found that senescent cells release tiny particles called exosomes. A research team from The Buck Institute for Research on Aging recently discovered that these exosomes carry aging-related messages through the bloodstream. Their study, titled “Exosomes released from senescent cells and circulatory exosomes isolated from human plasma reveal aging-associated proteomic and lipid signatures,” was featured as the cover article in Aging (Aging-US), Volume 17, Issue 8.

Full blog - https://aging-us.org/2025/09/how-exosomes-spread-aging-signals-and-could-support-anti-aging-research/

Paper DOI - https://doi.org/10.18632/aging.206292

Corresponding author - Birgit Schilling - bschilling@buckinstitute.org

Video short - https://www.youtube.com/watch?v=tcyAZahw-g8

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Keywords - aging, proteomics, senescence, exosomes, data-independent acquisitions

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How Exosomes Spread Aging Signals and Could Support Anti-Aging Research

BUFFALO, NY — September 9, 2025 — A new #research paper was #published in Volume 17, Issue 8 of Aging-US on August 1, 2025, titled “Causal relationships between gut microbiome and hundreds of age-related traits: evidence of a replicable effect on ApoM protein levels.”

In this study, Federica Grosso, Daniela Zanetti, and Serena Sanna from the Institute for Genetic and Biomedical Research (IRGB) of the National Research Council (CNR), Italy, uncovered new associations between gut microbiome and the aging process. The researchers found that certain microbial characteristics may causally influence proteins in the blood linked to inflammation and heart health. These findings could help explain how age-related diseases like cardiovascular conditions and macular degeneration are influenced by changes in the gut ecosystem.

The gut microbiome, the collection of microorganisms living in the digestive system, plays a major role in immune function and metabolic health. As people age, this microbial community shifts, often leading to imbalances associated with inflammation and chronic disease. To explore how these changes might affect the body, the researchers used Mendelian Randomization—a method that leverages genetic data—to test over 55,000 possible causal connections between gut microbial characteristics and age-related health indicators.

The study identified 91 significant causal relationships. Among them, the researchers found that higher levels of certain gut bacteria were associated with increased risk of age-related macular degeneration. Another finding was the association between a metabolic pathway in the gut, called “purine nucleotides degradation II,” and lower levels of apolipoprotein M (ApoM), a protein that helps protect against heart disease. This result was validated using data from an independent study, strengthening the evidence.

“Unlike previous studies, we performed replication analyses for the significant results using independent GWAS datasets, a fundamental step that has often been overlooked.”

The study also revealed how some bacteria may affect protein levels differently depending on a person’s blood type. Specifically, in individuals with blood type A, certain gut microbes that can break down a sugar called GalNAc may influence proteins related to inflammation and cardiovascular health. This suggests that personalized approaches to managing age-related diseases could consider both gut microbiota and genetic factors like blood type.

The research team followed strict guidelines to reduce false findings and confirmed its key results in independent datasets. By carefully testing for reverse causality and other biases, the authors provided strong evidence that the gut microbiome can influence critical aspects of aging biology.

Although more research is needed to fully understand the biological pathways involved, these findings suggest that targeting the gut microbiota might help delay or reduce age-related inflammation and disease. The study lays a foundation for future therapeutic strategies that could include diet, probiotics, or other microbiome-based interventions.

DOI - https://doi.org/10.18632/aging.206293

Corresponding author - Serena Sanna - serena.sanna@cnr.it

Abstract video - https://www.youtube.com/watch?v=CWky6jlHKUs

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Aging-US

Gut Microbiome Influences Proteins That Drive Aging and Disease

BUFFALO, NY — September 11, 2025 — A new #research paper was #published  in Volume 17, Issue 8 of Aging-US on August 8, 2025, titled “AI-driven toolset for IPF and aging research associates lung fibrosis with accelerated aging.”

In this study, researchers Fedor Galkin, Shan Chen, Alex Aliper, Alex Zhavoronkov, and Feng Ren from Insilico Medicine used artificial intelligence (AI) to investigate the similarities between idiopathic pulmonary fibrosis (IPF), a severe lung disease, and the aging process. Their findings show that IPF is not simply accelerated aging, but a distinct biological condition shaped by age-related dysfunction. This insight may lead to a new approach in how scientists and clinicians treat this complex disease.

IPF mainly affects individuals over the age of 60. It causes scarring of lung tissue, making it harder to breathe and often leading to respiratory failure. Current treatments can slow the disease but rarely stop or reverse its progression. The researchers used AI to identify shared biological features between aging and fibrosis, finding new potential targets for therapy.

The team developed a “proteomic aging clock” based on protein data from more than 55,000 participants in the UK Biobank. This AI-driven tool accurately measured biological age and found that patients with severe COVID-19, who are at increased risk for lung fibrosis, also showed signs of accelerated aging. This suggests that fibrosis leaves a detectable biological trace, supporting the use of aging clocks in studying age-related diseases.

“For aging clock training, we used the UK Biobank collection of 55319 proteomic Olink NPX profiles annotated with age and gender.”

They also developed a custom AI model, ipf-P3GPT, to compare gene activity in aging lungs versus those with IPF. Although some genes were active in both, many showed opposite behavior. In fact, more than half of the shared genes had inverse effects. This means IPF does not just speed up aging but also disrupts the body’s normal aging pathways.

The study identified unique molecular signatures that distinguish IPF from normal aging. While both involve inflammation and tissue remodeling, IPF drives more damaging changes to lung structure and repair systems. This difference could guide the development of drugs that specifically target fibrosis without affecting normal aging.

By combining AI with large-scale biological data, the study also introduces a powerful toolset for examining other age-related conditions such as liver and kidney fibrosis. These models may support personalized treatments and expand understanding of the relationships between aging and disease, opening new directions for therapy development.

DOI - https://doi.org/10.18632/aging.206295

Corresponding author - Alex Zhavoronkov - alex@insilico.com

Abstract video - https://www.youtube.com/watch?v=24lX2lHbt7o

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Keywords - aging, IPF, generative AI, transformer, proteomics

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AI Tools Uncover New Link Between Idiopathic Pulmonary Fibrosis and Aging

Immunotherapy is not usually effective against pancreatic cancer (PC), but a new study published in Oncotarget (Volume 16, 2025) highlights rare cases where it did help. These examples, though uncommon, may offer valuable insights for future treatment.

Pancreatic Cancer and Immunotherapy

Pancreatic cancer is often diagnosed at an advanced stage, which limits treatment options and contributes to its poor prognosis. While chemotherapy remains the standard treatment, it usually offers only modest benefits in terms of survival. Immunotherapy—an approach that activates the immune system to fight cancer—has been effective in other cancers but has shown limited success in PC.

This is largely due to the tumor’s ability to suppress immune responses and create an environment that protects it from attack. Currently, these drugs are only approved for a small subset of patients whose tumors have a specific genetic feature called high microsatellite instability (MSI-high), found in just 1 to 2 percent of cases.

The Study: Pancreatic Cancer Immunotherapy Responders

The study, titled “Exceptional responders to immunotherapy in pancreatic cancer: A multi-institutional case series of a rare occurrence,” was led by first author Kavin Sugumar and corresponding author Jordan M. Winter, from University Hospitals Seidman Cancer Center. 

The researchers examined medical records from 14 patients with pancreatic ductal adenocarcinoma (PDAC) who had responded unexpectedly well to immune checkpoint inhibitors—drugs that help reactivate immune cells to attack cancer. The drugs included PD-1 inhibitors such as pembrolizumab and nivolumab, CTLA-4 inhibitors like ipilimumab, and agents targeting tumor-associated macrophages. To find these rare cases, the research team contacted 471 oncologists from 91 major U.S. cancer centers between 2020 and 2021.

Full blog - https://www.oncotarget.org/2025/09/11/immunotherapy-response-in-pancreatic-cancer-what-a-new-study-reveals/

Paper DOI - https://doi.org/10.18632/oncotarget.28739

Correspondence to - Jordan M. Winter - jordan.winter@UHHospitals.org

Abstract video - https://www.youtube.com/watch?v=VeWTcuVmqgM

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Keywords - cancer, pancreatic adenocarcinoma, immunotherapy, exceptional responders, microsatellite instability, survival

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Immunotherapy Response in Pancreatic Cancer: What a New Study Reveals

Idiopathic Pulmonary Fibrosis (IPF) is a progressive lung disease that primarily affects people over the age of 60. It causes scarring in the lung tissue, which gradually reduces lung capacity and makes breathing difficult. Despite years of research, the exact causes of IPF remain largely unknown, and current treatments mainly aim to slow its progression rather than reverse or cure the disease.

Because IPF tends to develop later in life, researchers have long suspected a connection with biological aging. This is the focus of a recent study by scientists from Insilico Medicine. Their research, titled “AI-driven toolset for IPF and aging research associates lung fibrosis with accelerated aging,” was published recently in Aging-US, Volume 17, Issue 8.

Full blog - https://aging-us.org/2025/09/ai-tools-reveal-how-ipf-and-aging-are-connected/

Paper DOI - https://doi.org/10.18632/aging.206295

Corresponding author - Alex Zhavoronkov - alex@insilico.com

Abstract video - https://www.youtube.com/watch?v=24lX2lHbt7o

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Keywords - aging, IPF, generative AI, transformer, proteomics

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AI Tools Reveal How IPF and Aging Are Connected

BUFFALO, NY — September 16, 2025 — A new #research paper was #published  in Volume 17, Issue 8 of Aging-US on August 6, 2025, titled “Age-related trends in amyloid positivity in Parkinson’s disease without dementia.”

In this study, led by first author Keiko Hatano and corresponding author Masashi Kameyama from the Tokyo Metropolitan Institute for Geriatrics and Gerontology in Japan, researchers found that patients with Parkinson’s disease (PD) diagnosed in their 80s showed a significantly higher rate of amyloid positivity—an indicator associated with Alzheimer’s disease—compared to those diagnosed at a younger age. Importantly, none of the participants had dementia. These findings suggest that older patients with PD may face a greater risk of future cognitive decline and could benefit from early screening for Alzheimer’s-related brain changes.

Amyloid-beta is considered a key marker of cognitive decline. While it is known that amyloid accumulation contributes to PD with dementia, its role in patients who have not developed cognitive problems remains less understood. This study aimed to explore how age influences amyloid buildup in people with PD who do not yet show signs of dementia.

The researchers analyzed data from 89 individuals with PD and no signs of dementia. Participants were divided into two age-based groups: those diagnosed before age 73 (LOW group) and those diagnosed at age 73 or older (HIGH group). Using cerebrospinal fluid samples, they measured levels of amyloid-beta, a standard method for detecting early Alzheimer’s-related changes. The findings revealed that 30.6% of the older group tested positive for amyloid, compared to just 10.0% in the younger group.

“[…] we elucidated the prevalence of amyloid positivity in patients with PD without dementia, whose mean age at diagnosis was 80.2 years, using CSF Aβ42 levels.”

Interestingly, both age groups of Parkinson’s patients had a lower rate of amyloid positivity than cognitively normal individuals of the same age in the general population. This unexpected result suggests that PD may alter how amyloid accumulates in the brain, possibly shortening the phase in which amyloid builds up silently before symptoms appear. The authors suggest that amyloid buildup could accelerate the transition from healthy cognition to dementia in patients with PD. The study also observed age-related associations with other biological markers of Alzheimer’s disease, such as tau protein levels. 

As the global population continues to age and the number of older adults diagnosed with PD grows, identifying early warning signs of cognitive decline becomes increasingly important. These findings may help inform future screening approaches and support the development of therapies aimed at delaying or preventing dementia in people with Parkinson’s disease.

DOI - https://doi.org/10.18632/aging.206297

Corresponding author - Masashi Kameyama - kame-tky@umin.ac.jp

Abstract video - https://www.youtube.com/watch?v=AP8S9evzCJw

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Keywords - aging, amyloid positivity, Parkinson's disease without dementia, cerebrospinal fluid Aβ42

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Older Adults with Parkinson’s Disease Have Increased Brain Amyloid Without Dementia

BUFFALO, NY — September 18, 2025 — A new #research paper was #published  in Volume 17, Issue 8 of Aging-US on August 9, 2025, titled “The myokine FGF21 associates with enhanced survival in ALS and mitigates stress-induced cytotoxicity.”

In this study, led by first author Abhishek Guha and corresponding author Peter H. King from the University of Alabama at Birmingham and the Birmingham Veterans Affairs Medical Center, researchers discovered that a hormone called FGF21, which is released by muscles, is elevated in people with amyotrophic lateral sclerosis (ALS) and may play a protective role. These findings are especially relevant because ALS is a fatal and currently incurable neurodegenerative disease.

Amyotrophic lateral sclerosis is an age-related and progressive condition that affects the nerve cells responsible for muscle control. While some treatments can slow the disease, there is still a need to understand why ALS progresses at different rates in different individuals.

“In a prior muscle miRNA sequencing investigation, we identified altered FGF pathways in ALS muscle, leading us to investigate FGF21.”

The research team analyzed muscle biopsies, spinal cord tissue, and blood samples from ALS patients and found that FGF21 levels were significantly elevated. This increase was particularly evident in atrophied muscle fibers—those that had shrunk due to nerve loss—and in the surrounding tissue. Importantly, patients with higher plasma levels of FGF21 showed slower loss of function and longer survival, with some living more than six years after diagnosis.

Using animal models and cultured cells, the researchers demonstrated that FGF21 levels rise even in the early, symptom-free stages of ALS. The hormone appeared to protect both muscle and motor neurons from stress-related damage. When added to stressed cells, FGF21 improved cell survival and reduced markers of cell death. In human muscle cells, FGF21 also supported the formation of new muscle fibers, a process known as myogenesis.

Blood tests revealed that patients with higher levels of FGF21 not only experienced slower disease progression but also tended to have a higher body mass index (BMI), a factor previously associated with longer survival in ALS. This suggests that FGF21 may reflect a patient’s ability to counteract ALS through natural protective mechanisms. It could also serve as a biomarker to monitor disease severity and potentially guide treatment decisions.

The study also investigated how FGF21 communicates with cells. It found that the hormone’s activity depends on a protein called β-Klotho, which was also altered in ALS-affected tissues. These changes were especially noticeable in motor neurons and muscle cells under stress, further highlighting FGF21’s role in the body’s response to damage.

While the study does not show that FGF21 can be used as a treatment, it highlights the hormone as a promising target for future research, clinical trials, and strategies to slow ALS progression by leveraging the body’s natural protective systems.

DOI - https://doi.org/10.18632/aging.206298

Corresponding author - Peter H. King - phking@uabmc.edu

Abstract video - https://www.youtube.com/watch?v=zEGMxQrxZxE

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Keywords - aging, fibroblast growth factor, 21 β-Klotho, ALS biomarker, human skeletal muscle, motor neurons

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FGF21 Muscle Hormone Associated with Slow ALS Progression and Extended Survival

Aging-US is dedicated to advancing our understanding of the biological mechanisms that drive aging and the development of age-related diseases. Our mission is to serve as a platform for high-quality research that uncovers the cellular, molecular, and systemic processes underlying aging, and translates these insights into strategies to extend healthspan and delay the onset of chronic disease.

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