How Inflammation, Epigenetics, and RNA Stability Drive Aging at the Molecular Level
A comprehensive 2025 review maps the molecular hallmarks of aging—from telomeres to NF-κB—and the therapeutic targets they reveal.
Summary
This 2025 review in Genes synthesizes current understanding of aging biology, focusing on ten interconnected hallmarks including cellular senescence, telomere attrition, epigenetic drift, and chronic inflammation. The authors examine four key molecular modulators—telomere/telomerase dynamics, the Klotho gene, angiotensin-converting enzyme (ACE), and the NF-κB pathway—detailing how each contributes to biological aging and age-related disease. Environmental factors and RNA stability are also explored as modulators. The review concludes by identifying therapeutic strategies such as telomerase activation, Klotho supplementation, ACE inhibition, and NF-κB modulation as promising interventions to extend healthspan and lifespan.
Detailed Summary
Aging remains one of medicine's most complex unsolved problems, driven by the progressive accumulation of molecular and cellular damage across decades. This 2025 narrative review by Dragoumani and colleagues, published in Genes, provides a thorough mechanistic synthesis of aging biology, integrating molecular pathways, environmental modulators, and emerging therapeutic targets.
The authors begin by cataloguing ten recognized hallmarks of aging: cellular senescence, genomic instability, telomere attrition, epigenetic alterations, loss of proteostasis, mitochondrial dysfunction, stem cell exhaustion, altered intercellular communication, chronic inflammation (inflammaging), and gut dysbiosis. These hallmarks are presented as synergistic and mutually reinforcing, collectively creating the biological landscape of aging. Importantly, the review emphasizes that senescent cells secrete a pro-inflammatory senescence-associated secretory phenotype (SASP)—including IL-6, IL-1α/β, TNF-α, VEGF, and TGF-β—which perpetuates tissue dysfunction far beyond the originally damaged cell.
Four molecular modulators receive especially detailed treatment. Telomere dynamics are central: telomeres shorten with each cell division, eventually triggering DNA damage responses that enforce irreversible cell cycle arrest via the p53/p21 and p16INK4a/Rb pathways. Telomerase, the enzyme that replenishes telomeric repeats, is highlighted as a key longevity regulator, with its activation representing a potential anti-aging intervention. The Klotho gene encodes a transmembrane protein that suppresses insulin/IGF-1 signaling, exhibits antioxidant properties, and protects against oxidative stress; reduced Klotho expression correlates with accelerated aging phenotypes and age-related diseases. ACE plays a dual role—regulating blood pressure through the renin-angiotensin system and degrading amyloid-beta peptides—making ACE inhibition relevant to both cardiovascular and neurodegenerative aging pathologies. The NF-κB transcription factor pathway is positioned as a master driver of inflammaging, as its chronic activation by senescent cells and environmental stressors sustains the low-grade pro-inflammatory state characteristic of aged tissues.
The review also addresses epigenetic clocks (notably the Horvath clock) as quantitative tools for measuring biological aging rate, and discusses how DNA methylation shifts, histone modification changes, and chromatin remodeling alter gene expression trajectories over time. RNA stability and post-transcriptional regulation emerge as underappreciated modulators, with mRNA decay pathways influencing the longevity of inflammatory mediator transcripts. Environmental inputs—including oxidative stress, dietary patterns, physical activity, microbiome composition, and toxin exposure—are integrated as upstream modulators that interact with all molecular pathways described.
Therapeutically, the authors argue that the convergence of these pathways offers multiple druggable nodes: telomerase activators, recombinant or gene-therapy-based Klotho supplementation, established ACE inhibitors repurposed for longevity, and small-molecule NF-κB inhibitors. Senolytics and senomorphics targeting SASP are also noted as promising. The authors acknowledge that most evidence derives from model organisms and that human translation remains challenging.
Key Findings
- Ten synergistic aging hallmarks—including SASP, telomere attrition, and inflammaging—collectively drive functional decline.
- Telomerase activation may counteract replicative senescence by maintaining telomere length across cell divisions.
- Klotho suppresses insulin/IGF-1 signaling and oxidative stress; its decline accelerates multiple aging phenotypes.
- NF-κB chronic activation is the central driver of inflammaging, linking senescent cell secretome to age-related disease.
- ACE inhibition may provide dual benefit by lowering blood pressure and reducing amyloid-beta accumulation in aging brains.
Methodology
This is a narrative review article synthesizing published literature across molecular biology, genetics, and aging research. No primary experimental data were generated; evidence is drawn from mechanistic studies, epidemiological findings, and prior reviews. The authors integrate findings across model organisms and human studies without formal meta-analytic methodology.
Study Limitations
As a narrative rather than systematic review, the paper does not apply formal inclusion/exclusion criteria or quantitative synthesis, which limits reproducibility of its conclusions. Most mechanistic evidence cited derives from animal models or in vitro studies, with limited randomized human trial data supporting the proposed interventions. The interplay between pathways is described conceptually but causal hierarchies and effect sizes in humans remain poorly defined.
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