|galactosidase, beta 1|
|Locus||Chr. 3 p22.3|
Senescence-associated beta-galactosidase (SA-β-gal or SABG) is a hypothetical hydrolase enzyme that catalyzes the hydrolysis of β-galactosides into monosaccharides only in senescent cells. Senescence-associated beta-galactosidase, along with p16Ink4A, is regarded to be a biomarker of cellular senescence.
Its existence was proposed in 1995 by Dimri et al. following the observation that when beta-galactosidase assays were carried out at pH 6.0, only cells in senescence state develop staining. They proposed a cytochemical assay based on production of a blue-dyed precipitate that results from the cleavage of the chromogenic substrate X-Gal. Since then, even more specific quantitative assays were developed for its detection at pH 6.0.
Today this phenomenon is explained by the overexpression and accumulation of the endogenous lysosomal beta-galactosidase specifically in senescent cells. Its expression is not required for senescence. However, it remains as the most widely used biomarker for senescent and aging cells, because it is easy to detect and reliable both in situ and in vitro.
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- Lee BY, Han JA, Im JS, Morrone A, Johung K, Goodwin EC, Kleijer WJ, DiMaio D, Hwang ES (April 2006). "Senescence-associated beta-galactosidase is lysosomal beta-galactosidase". Aging Cell. 5 (2): 187–95. PMID 16626397. doi:10.1111/j.1474-9726.2006.00199.x.
- Yang NC, Hu ML (October 2005). "The limitations and validities of senescence associated-beta-galactosidase activity as an aging marker for human foreskin fibroblast Hs68 cells". Exp. Gerontol. 40 (10): 813–9. PMID 16154306. doi:10.1016/j.exger.2005.07.011.
- "SA-β-galactosidase expressing cells from human renal proximal tubular epithelial cells". www.sciencellonline.com. Archived from the original on March 13, 2012. Retrieved 2009-05-22.
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