Senescent human melanocytes drive skin ageing via paracrine telomere dysfunction.

Published on Oct 21, 2019in The EMBO Journal11.227
· DOI :10.15252/embj.2019101982
Stella Victorelli4
Estimated H-index: 4
(Newcastle University),
Anthony Lagnado3
Estimated H-index: 3
(Newcastle University)
+ 15 AuthorsJoão F. Passos29
Estimated H-index: 29
(Newcastle University)
Cellular senescence has been shown to contribute to skin ageing. However, the role of melanocytes in the process is understudied. Our data show that melanocytes are the only epidermal cell type to express the senescence marker p16(INK4A) during human skin ageing. Aged melanocytes also display additional markers of senescence such as reduced HMGB1 and dysfunctional telomeres, without detectable telomere shortening. Additionally, senescent melanocyte SASP induces telomere dysfunction in paracrine manner and limits proliferation of surrounding cells via activation of CXCR3-dependent mitochondrial ROS. Finally, senescent melanocytes impair basal keratinocyte proliferation and contribute to epidermal atrophy in vitro using 3D human epidermal equivalents. Crucially, clearance of senescent melanocytes using the senolytic drug ABT737 or treatment with mitochondria-targeted antioxidant MitoQ suppressed this effect. In conclusion, our study provides proof-of-concept evidence that senescent melanocytes affect keratinocyte function and act as drivers of human skin ageing.
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