Secretome aging describes age-related changes in the collection of factors secreted by cells, including cytokines, growth factors, enzymes, and metabolites. Aging cells exhibit altered secretory profiles that promote inflammation, fibrosis, and tissue dysfunction. Senescent cells contribute disproportionately through secretion of pro-inflammatory and matrix-modifying factors. Secretome aging disrupts tissue microenvironments and impairs regenerative signaling. These secreted factors influence immune activation, stem cell behavior, and intercellular communication. Understanding secretome aging reveals how altered extracellular signaling environments drive functional decline and disease vulnerability during aging.
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