We conclude that MMP-1 expression is essential for the ability of MDA-231 cells to invade and destroy a collagen matrix and in vivo experiments suggest an important role for MMP-1 in breast tumor growth.
Matrix metalloproteinase Mmp-1a is dispensable for normal growth and fertility in mice and promotes lung cancer progression by modulating inflammatory responses.
Promotion of metastasis in response to miR-224 downregulation was associated with derepression of the stroma-associated RKIP target genes, CXCR4, MMP1, and OPN, which are involved in breast tumor metastasis to the bone.
MMP-1 (interstitial collagenase) has been associated with MDA-MB-231 invasion in vitro, while MMP-3 (stromelysin-1) has been localised around invasive cells of breast tumours in vivo.
The levels of the matrix metalloproteinase MMP1 mRNA in three breast tumour cell lines with varying numbers of epidermal growth factor (EGF) receptors, MDA-MB-231, T47D and MCF7, were investigated following treatment with EGF or TGF alpha in serum-free medium for up to 24 h. A higher level of MMP1 mRNA was found in both control and treated MDA-MB-231 cells compared with the other two cell lines.