Senescence burden refers to accumulation of senescent cells within tissues over time. Senescent cells permanently exit the cell cycle and resist apoptosis while remaining metabolically active. With aging, clearance mechanisms become less efficient, allowing senescent cells to persist. Increased senescence burden contributes to chronic inflammation, tissue dysfunction, and impaired regeneration. Senescent cells influence neighboring cells through inflammatory signaling and matrix remodeling. Senescence burden varies across tissues and correlates with biological aging rather than chronological age. Understanding senescence burden supports strategies aimed at reducing age-associated functional decline by targeting senescent cell accumulation.
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