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      How matrix metalloproteinases regulate cell behavior.

      Annual review of cell and developmental biology

      Animals, Bone and Bones, cytology, enzymology, Cell Communication, Extracellular Matrix, physiology, Extracellular Matrix Proteins, metabolism, Humans, Matrix Metalloproteinases, genetics, Neoplasms, pathology, Neovascularization, Physiologic, Protein Processing, Post-Translational, Signal Transduction, Tissue Inhibitor of Metalloproteinases, antagonists & inhibitors, Transcription, Genetic

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          The matrix metalloproteinases (MMPs) constitute a multigene family of over 25 secreted and cell surface enzymes that process or degrade numerous pericellular substrates. Their targets include other proteinases, proteinase inhibitors, clotting factors, chemotactic molecules, latent growth factors, growth factor-binding proteins, cell surface receptors, cell-cell adhesion molecules, and virtually all structural extracellular matrix proteins. Thus MMPs are able to regulate many biologic processes and are closely regulated themselves. We review recent advances that help to explain how MMPs work, how they are controlled, and how they influence biologic behavior. These advances shed light on how the structure and function of the MMPs are related and on how their transcription, secretion, activation, inhibition, localization, and clearance are controlled. MMPs participate in numerous normal and abnormal processes, and there are new insights into the key substrates and mechanisms responsible for regulating some of these processes in vivo. Our knowledge in the field of MMP biology is rapidly expanding, yet we still do not fully understand how these enzymes regulate most processes of development, homeostasis, and disease.

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