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Published 23 May 2005. doi:10.1083/jcb.200409115
The Rockefeller University Press, 0021-9525 $8.00
JCB, Volume 169, Number 4, 681-691
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Article

Processing of VEGF-A by matrix metalloproteinases regulates bioavailability and vascular patterning in tumors



Sunyoung Lee1, Shahla M. Jilani1, Ganka V. Nikolova1, Darren Carpizo1, and M. Luisa Iruela-Arispe1,2,3

1 Department of Molecular, Cell, and Developmental Biology
2 Molecular Biology Institute, University of California, Los Angeles, Los Angeles, CA 90095
3 Jonsson Comprehensive Cancer Center, University of California, Los Angeles, Los Angeles, CA 90095

Correspondence to M. Luisa Iruela-Arispe: arispe{at}mbi.ucla.edu

Vascular endothelial growth factor (VEGF) is a critical mediator of blood vessel formation during development and in pathological conditions. In this study, we demonstrate that VEGF bioavailability is regulated extracellularly by matrix metalloproteinases (MMPs) through intramolecular processing. Specifically, we show that a subset of MMPs can cleave matrix-bound isoforms of VEGF, releasing soluble fragments. We have mapped the region of MMP processing, have generated recombinant forms that mimic MMP-cleaved and MMP-resistant VEGF, and have explored their biological impact in tumors. Although all forms induced similar VEGF receptor 2 phosphorylation levels, the angiogenic outcomes were distinct. MMP-cleaved VEGF promoted the capillary dilation of existent vessels but mediated a marginal neovascular response within the tumor. In contrast, MMP-resistant VEGF supported extensive growth of thin vessels with multiple and frequent branch points. Our findings support the view that matrix-bound VEGF and nontethered VEGF provide different signaling outcomes. These findings reveal a novel aspect in the regulation of extracellular VEGF that holds significance for vascular patterning.

Abbreviations used in this paper: CAM, chorioallantoic membrane; HEK, human embryonic kidney; MALDI-TOF MS, matrix-assisted laser desorption time-of-flight MS; MMP, matrix metalloproteinase; µLC/MSn, capillary and microcapillary nano–liquid chromatography MS; µLC/MS/MS, microcapillary reverse-phase HPLC nano-electrospray tandem MS; MS, mass spectrometry; PAE, porcine aortic endothelial; PAE-VEGFR2, PAE cells expressing VEGFR2; PECAM, platelet/endothelial cell adhesion molecule 1; TIMP, tissue inhibitor of MPs; VEGFR2, VEGF receptor 2.


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