Mixed
Senescent human cells in vivo can be identified and quantified using a biomarker for senescence-associated beta-galactosidase (SA-β-Gal) activity at pH 6, which correlates with replicative age and accumulates in aging skin.
This research establishes a reliable method to identify senescent cells in human tissue using a specific enzyme activity (SA-β-Gal at pH 6). It confirms that these cells accumulate in the skin with age, providing a biological basis for age-related changes. For longevity research, this biomarker is a critical tool for validating interventions aimed at clearing senescent cells (senolytics) or preventing their accumulation.
We show that several human cells express a β-galactosidase, histochemically detectable at pH 6, upon senescence in culture... In skin samples from human donors of different age, there was an age-dependent increase in this marker in dermal fibroblasts and epidermal keratinocytes. This marker provides in situ evidence that senescent cells may exist and accumulate with age in vivo.
Why this rating
The study uses rigorous in vitro controls (distinguishing senescence from quiescence/differentiation) and in vivo human tissue samples from multiple donors, though it is a single observational study without longitudinal intervention data.
Source
A biomarker that identifies senescent human cells in culture and in aging skin in vivo.
Goberdhan P. Dimri et al. · Proceedings of the National Academy of Sciences · 1995
DOI 10.1073/pnas.92.20.9363
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