Hair Shaft Miniaturization Causes Stem Cell Depletion Through Mechanosensory Signals Mediated by a Piezo1-Calcium-TNF-α Axis

October 2021 in “ Cell Stem Cell ”

Yuhua Xie, Daoming Chen, Kaiju Jiang, Ling Song, Nannan Qian, Yingxue Du, Yang Yong, Fengchao Wang, Ting Chen

Studysummary This study found that hair shaft miniaturization in aging and genetic hypotrichosis leads to hair follicle stem cell loss through mechanical compression and apoptosis mediated by the Piezo1 channel. Our plain-language summary of this paper — not a Tressless recommendation.

The study "Hair shaft miniaturization causes stem cell depletion through mechanosensory signals mediated by a Piezo1-calcium-TNF-α axis" reveals that hair shaft miniaturization, common in aging, androgenic alopecia, and genetic hypotrichosis disorders, leads to hair follicle stem cell (HFSC) loss. This loss is due to the shrinkage of the physical niche size, causing mechanical compression of HFSCs and triggering their death (apoptosis) through the activation of the mechanosensitive channel Piezo1. The study also found that the presence of tumor necrosis factor alpha (TNF-α), a cell death-promoting signal, in combination with Piezo1 activation, induced robust apoptosis. In experiments with genetically modified mice, the removal of Piezo1 significantly decreased apoptosis, suggesting it as a potential therapeutic target for preventing stem cell loss.

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