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Calmodulin-like skin protein suppresses the increase in senescence-associated β-galactosidase induced by hydrogen peroxide or ultraviolet irradiation in keratinocytes.

Cell Biol. Int.2019 Jul;43(7):835-843. doi:10.1002/cbin.11159. Epub 2019 May 18
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摘要


Calmodulin-like skin protein (CLSP) is a secreted peptide that is produced by skin keratinocytes and some related epithelial cells. It has previously been shown that CLSP is recruited via the bloodstream into the central nervous system where it likely exerts a neuroprotective effect against toxicity related to Alzheimer's disease (AD) by binding to the heterotrimeric humanin receptor and activating intracellular survival signaling. However, it remains to be elucidated whether secreted CLSP shows a protective effect in the skin tissues. In the current study, using primary keratinocytes treated with hydrogen peroxide (H2 O2 ) or exposed to ultraviolet (UV) irradiation as senescence models of keratinocytes, we addressed whether CLSP affects senescence in skin keratinocytes. We found that CLSP expression was upregulated by H2 O2 or UV in keratinocytes. Furthermore, co-incubation with recombinant CLSP reduced the increase in senescence-associated β-galactosidase-positivity in keratinocytes that were induced by H2 O2 or UV. These results suggest that CLSP may function as a senescence-suppressing factor in keratinocytes.

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