MMPs are a group of enzymes involved in matrix degradation. Of the sixteen members of matrix metalloproteinase family ten exist in soluble form whereas MT MMPs exist as integral membrane proteins. MT1 MMp, MT2 MMP and MT3 MMP also known as MMP 14, MMP 15 and MMP 16 respectively. They contain a C-terminal transmembrane domain anchoring them to the cell surface. MT2 MMP plays a minor role in activation of pro-MMP 2 to its active form in breast carcinomas. Coexpression of MT1 MMP and MT2 MMP in advanced stages of breast carcinomas is indicative of possible involvement of MT2 MMP in its metastasis.
