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    Hair follicle bulge stem cells appear dispensable for the acute phase of wound re-epithelialization

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    Ansell_Stem_Cells.pdf (747.4Kb)
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    Publication date
    2016-05
    Author
    Garcin, C.L.
    Ansell, David M.
    Headon, D.J.
    Paus, R.
    Hardman, M.J.
    Keyword
    Skin
    Hair follicle
    Bulge
    Wound healing
    Rights
    © 2016 The Authors. Stem Cells published by Wiley Periodicals, Inc. on behalf of AlphaMed Press. This is an open access article under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
    Peer-Reviewed
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    Abstract
    The cutaneous healing response has evolved to occur rapidly, in order to minimize infection and to re‐establish epithelial homeostasis. Rapid healing is achieved through complex coordination of multiple cell types, which importantly includes specific cell populations within the hair follicle (HF). Under physiological conditions, the epithelial compartments of HF and interfollicular epidermis remain discrete, with K15+ve bulge stem cells contributing progeny for HF reconstruction during the hair cycle and as a basis for hair shaft production during anagen. Only upon wounding do HF cells migrate from the follicle to contribute to the neo‐epidermis. However, the identity of the first‐responding cells, and in particular whether this process involves a direct contribution of K15+ve bulge cells to the early stage of epidermal wound repair remains unclear. Here we demonstrate that epidermal injury in murine skin does not induce bulge activation during early epidermal wound repair. Specifically, bulge cells of uninjured HFs neither proliferate nor appear to migrate out of the bulge niche upon epidermal wounding. In support of these observations, Diphtheria toxin‐mediated partial ablation of K15+ve bulge cells fails to delay wound healing. Our data suggest that bulge cells only respond to epidermal wounding during later stages of repair. We discuss that this response may have evolved as a protective safeguarding mechanism against bulge stem cell exhaust and tumorigenesis.
    URI
    http://hdl.handle.net/10454/17829
    Version
    Published version
    Citation
    Garcin CL, Ansell DM, Headon DJ et al (2016) Hair follicle bulge stem cells appear dispensable for the acute phase of wound re-epithelialization. Stem Cells. 34(5): 1377-1385.
    Link to publisher’s version
    https://doi.org/10.1002/stem.2289
    Type
    Article
    Collections
    Life Sciences Publications

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