Unfolded protein response aging describes age-related impairment of adaptive signaling pathways activated by protein misfolding stress. The unfolded protein response restores balance by reducing protein synthesis and enhancing folding capacity. With aging, this response becomes less effective and more prolonged. Impaired unfolded protein response aging leads to chronic stress signaling rather than resolution. This contributes to proteotoxicity, inflammation, and cell death. Reduced adaptability of this response limits cellular resilience under metabolic or environmental stress. Understanding unfolded protein response aging reveals how declining stress adaptation accelerates functional decline during aging.
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