Breaking the canon: indirect regulation of Wnt signaling in mammary stem cells by MMP3.

LaBarge, Mark A · Cell Stem Cell · 2013

editorial · Level V

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Abstract

Matrix metalloproteases promote tumor cell invasion, epithelial-to-mesenchymal transitions, and metastases, but whether they directly regulate stem cells is unknown. In this issue of Cell Stem Cell, Kessenbrock et al. (2013) now show that MMP3, independent of its proteolytic activity, regulates murine mammary stem cells by sequestering noncanonical Wnt signaling ligands, which has implications for breast cancer pathogenesis.

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