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Expression of MAEG, a novel basement membrane protein, in mouse hair follicle morphogenesis.

Exp. Cell Res.2005 Feb 1;303(1):148-59
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摘要


We screened for genes specifically expressed in the mesenchymes of developing hair follicles using representational differential analysis; one gene identified was MAEG, which encodes a protein consisting of five EGF-like repeats, a linker segment containing a cell-adhesive Arg-Gly-Asp (RGD) motif, and a MAM domain. Immunohistochemistry showed that MAEG protein was localized at the basement membrane of embryonic skin and developing hair follicles, while MAEG expression diminished at the tip of the hair bud. A recombinant MAEG fragment containing the RGD motif was active in mediating adhesion of keratinocytes to the substratum in an RGD-dependent manner. One of the adhesion receptors recognizing the RGD motif was found to be the alpha8beta1 integrin, the expression of which was detected in the placode close to MAEG-positive mesenchymal cells, but later became restricted to the tip of the developing hair bud. Given its localized expression at the basement membrane in developing hair follicles and the RGD-dependent cell-adhesive activity, MAEG may play a role as a mediator regulating epithelial-mesenchymal interaction through binding to RGD-binding integrins including alpha8beta1 during hair follicle development.

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