Citation

Shwartz Y, Gonzalez-Celeiro M, Chen CL, Pasolli HA, Sheu SH, Fan SM, Shamsi F, Assaad S, Lin ET, Zhang B, Tsai PC, He M, Tseng YH, Lin SJ, Hsu YC. 2020. Cell Types Promoting Goosebumps Form a Niche to Regulate Hair Follicle Stem Cells. Cell. 182(3):578-593.e19. Pubmed: 32679029 DOI:10.1016/j.cell.2020.06.031

Abstract

Piloerection (goosebumps) requires concerted actions of the hair follicle, the arrector pili muscle (APM), and the sympathetic nerve, providing a model to study interactions across epithelium, mesenchyme, and nerves. Here, we show that APMs and sympathetic nerves form a dual-component niche to modulate hair follicle stem cell (HFSC) activity. Sympathetic nerves form synapse-like structures with HFSCs and regulate HFSCs through norepinephrine, whereas APMs maintain sympathetic innervation to HFSCs. Without norepinephrine signaling, HFSCs enter deep quiescence by down-regulating the cell cycle and metabolism while up-regulating quiescence regulators Foxp1 and Fgf18. During development, HFSC progeny secretes Sonic Hedgehog (SHH) to direct the formation of this APM-sympathetic nerve niche, which in turn controls hair follicle regeneration in adults. Our results reveal a reciprocal interdependence between a regenerative tissue and its niche at different stages and demonstrate sympathetic nerves can modulate stem cells through synapse-like connections and neurotransmitters to couple tissue production with demands.
Copyright © 2020 Elsevier Inc. All rights reserved.

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Photo of Ya-Chieh Hsu

Ya-Chieh Hsu studies the principles and molecular nature of cell-cell interactions governing development, regeneration, and injury repair in the skin.

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