Abstract
Evidence shows that there is a synergistic, bidirectional association between cancer and aging with many shared traits. Age itself is a risk factor for the onset of most cancers, while evidence suggests that cancer and its treatments might accelerate aging by causing genotoxic and cytotoxic insults. Aging has been associated with a series of alterations that can be linked to cancer: i) genomic instability caused by DNA damage or epigenetic alterations coupled with repair errors, which lead to progressive accumulation of mutations; ii) telomere attrition with possible impairment of telomerase, shelterin complex, or the trimeric complex (Cdc13, Stn1 and Ten1 - CST) activities associated with abnormalities in DNA replication and repair; iii) altered proteostasis, especially when leading to an augmented proteasome, chaperon and autophagy-lysosome activity; iv) mitochondrial dysfunction causing oxidative stress; v) cellular senescence; vi) stem cells exhaustion, intercellular altered communication and deregulated nutrient sensing which are associated with microenvironmental modifications which may facilitate the subsequential role of cancer stem cells. Nowadays, anti-growth factor agents and epigenetic therapies seem to assume an increasing role in fighting aging-related diseases, especially cancer. This report aims to discuss the impact of age on cancer growth.
Keywords: aging, cancer, epigenetic, genomic instability, microenvironment, oxidative stress.
Graphical Abstract
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