Journal
BIOESSAYS
Volume 27, Issue 11, Pages 1181-1191Publisher
WILEY
DOI: 10.1002/bies.20306
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Proteolytic cleavage of extracellular matrix (ECM) is a critical regulator of many physiological and pathological events. It affects fundamental processes such as cell growth, differentiation, apoptosis and migration. Most proteases are produced as inactive proenzymes that undergo proteolytic cleavage for activation. Proteolytic activity is additionally modified by endogenous inhibitors. Mechanisms that localize and concentrate protease activity in the pericellular microenvironment of cells are prerequisites for processes like angiogenesis, bone development, inflammation and tumor cell invasion. Methods that enable real-time, high-resolution imaging and precise quantification of local proteolytic activity in vitro and in vivo remain major challenges. These methods will play an important role in the understanding of basic principles e.g. in cancer cell invasion, the identification of new therapeutical targets and hence drug design. This review highlights mechanisms and functions of local proteolytic activity with special emphasis on tumor cell invasion and metastasis, and focuses on techniques for the investigation of this process. (c) 2005 Wiley Periodicals, Inc.
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