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Am J Physiol Heart Circ Physiol 283: H1430-H1438, 2002. First published June 13, 2002; doi:10.1152/ajpheart.00082.2002
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Vol. 283, Issue 4, H1430-H1438, October 2002

Differential involvement of MMP-2 and VEGF during muscle stretch- versus shear stress-induced angiogenesis

Irina Rivilis1, Malgorzata Milkiewicz2, Pamela Boyd1, Jason Goldstein1, Margaret D. Brown2, Stuart Egginton2, Fay M. Hansen3, Olga Hudlicka2, and Tara L. Haas1

1 Department of Kinesiology and Health Sciences, York University, Toronto, Ontario, Canada M3J 1P3; 2 Department of Physiology, University of Birmingham, Birmingham, United Kingdom B15 2TT; and 3 Department of Biological Sciences, Oakland University, Rochester, Michigan 48309-4401

Capillary growth in skeletal muscle occurs via the dissimilar processes of abluminal sprouting or longitudinal splitting, which can be initiated by muscle stretch and elevated shear stress, respectively. The distinct morphological hallmarks of these types of capillary growth suggest that discrete sets of angiogenic mediators play a role in each situation. Because proteolysis and proliferation are two key steps associated with capillary growth, we tested whether differences in the regulation of matrix metalloproteinases (MMPs) or VEGF may be associated with the two types of capillary growth. We found significant increases in MMP-2 total protein and percent activation, and membrane type-1 MMP mRNA levels, compared with controls after muscle stretch but not after shear stress stimulation. In contrast, VEGF protein and endothelial cell proliferation increased after either angiogenic stimulus. We observed that MMP-2 regulation occurs independent of VEGF signaling, because VEGF did not induce MMP-2 production or activation in isolated endothelial cells. Our data suggest that the involvement of MMPs in capillary growth is dependent on the nature of the angiogenic stimulus.

matrix metalloproteinase


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