Telomere Dynamics in Aging and Cancer: Mechanisms, Clinical Implications, and Therapeutic Potential

Telomeres, specialized DNA-protein structures located at the ends of chromosomes, play critical roles in maintaining genomic stability and regulating cellular lifespan. With each cellular division, telomeres gradually shorten, eventually triggering cellular senescence or apoptosis. However, cancer cells often bypass this replicative limit through telomerase activation or alternative lengthening mechanisms, enabling indefinite proliferation and tumor progression. This review systematically discusses the complex relationships between telomeres, cellular aging, and cancer, emphasizing telomere length dynamics, regulatory enzymes such as telomerase, and influencing factors including genetic predispositions, lifestyle, and environmental stressors. It also highlights innovative technological advancements in telomere analysis and potential clinical applications in anti-aging therapies, cancer treatments, and regenerative medicine. Despite promising advances, significant challenges remain, such as ethical considerations and balancing therapeutic telomere extension against cancer risks. Future interdisciplinary research integrating molecular biology, genetics, advanced imaging, and bioinformatics is crucial for translating telomere biology into effective clinical strategies aimed at extending healthy human lifespan and combating age-related diseases.