The name EMMPRIN reflects this proteins extracellular metalloproteinase inducer activity. It is a cell surface protein with two extracellular Ig domains, a transmembrane domain, and a cytoplasmic domain. Its expression is often elevated in human tumor cells, which in turn promotes MMP-1, MMP-2 and MMP-3 production in melanoma cells and MMP-2 and MMP-9 production in breast cancer cells. It interacts with several types of molecules such as integrins, caveolin-1 and MCT1. TRA-1-85 is an epitope within EMMPRIN.