Maspin is an extracellular matrix tumor supressor that blocks the growth, invasion, and metastatic properties of mammary and prostate tumors. Structurally Maspin is a serine protease inhibitor (Serpin), but it does not undergo the stressed to relaxed conformational transition characteristic of active serpins and exhibits no serine protease inhibitory activity. Maspin is also expressed by the corneal epithelium and regulates migration and adhesion of corneal stromal fibroblasts and myofibroblasts during corneal wound healing.
