An EGFP-Col4a2 Mouse Model Reveals Basement Membrane Dynamics Underlying Hair Follicle Morphogenesis

    November 2024 in “ The Journal of Cell Biology
    Duligengaowa Wuergezhen, Eleonore Gindroz, Ritsuko Morita, Kei Hashimoto, Takaya Abe, Hiroshi Kiyonari, Hironobu Fujiwara
    TLDR Basement membrane changes are crucial for hair follicle development.
    The study using an eGFP-Col4a2 mouse model uncovers the dynamics of basement membrane (BM) remodeling during hair follicle morphogenesis. By tagging the collagen IV gene with a fluorescent marker, researchers observed that the turnover rate of COL4A2 is spatially graded and linked to BM expansion and epithelial progenitor proliferation. Epithelial progenitors are displaced by expanding BMs but remain stationary on non-expanding BMs. Inhibiting matrix metalloproteinase delays COL4A2 turnover, restricts BM expansion, and alters progenitor cell division, impacting hair follicle shape. These findings emphasize the importance of BM dynamics in shaping organ development.
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