ASK1-dependent recruitment and activation of macrophages induce hair growth in skin wounds

N. Osaka,Takumi Takahashi,Shiori Murakami,A. Matsuzawa,T. Noguchi,Takeshi Fujiwara,H. Aburatani,K. Moriyama,K. Takeda,H. Ichijo

Published 2007 in Journal of Cell Biology

ABSTRACT

Apoptosis signal-regulating kinase 1 (ASK1) is a member of the mitogen-activated protein 3-kinase family that activates both c-Jun NH2-terminal kinase and p38 pathways in response to inflammatory cytokines and physicochemical stress. We report that ASK1 deficiency in mice results in dramatic retardation of wounding-induced hair regrowth in skin. Oligonucleotide microarray analysis revealed that expression of several chemotactic and activating factors for macrophages, as well as several macrophage-specific marker genes, was reduced in the skin wound area of ASK1-deficient mice. Intracutaneous transplantation of cytokine-activated bone marrow-derived macrophages strongly induced hair growth in both wild-type and ASK1-deficient mice. These findings indicate that ASK1 is required for wounding-induced infiltration and activation of macrophages, which play central roles in inflammation-dependent hair regrowth in skin.

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