mTORC1 aging refers to age-associated hyperactivation of mechanistic target of rapamycin complex 1 signaling. mTORC1 regulates protein synthesis, cell growth, and nutrient utilization. With aging, persistent mTORC1 activity suppresses autophagy and promotes accumulation of damaged proteins and organelles. This shift accelerates cellular dysfunction and metabolic imbalance. mTORC1 aging is linked to reduced stress resistance, stem cell decline, and increased disease risk. Understanding mTORC1 aging reveals how growth-favoring signaling drives biological aging and limits cellular repair capacity.
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