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Originally published as MBC in Press, 10.1091/mbc.E01-09-0066 on April 17, 2002
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Vol. 13, Issue 6, 1893-1905, June 2002

Thrombospondin 2 Inhibits Microvascular Endothelial Cell Proliferation by a Caspase-independent Mechanism

Lucas C. Armstrong,* Benny Björkblom,* Kurt D. Hankenson,* Anthony W. Siadak,dagger Charlotte E. Stiles,* and Paul Bornstein*Dagger §

Departments of  *Biochemistry and  Dagger Medicine, University of Washington, Seattle, Washington 98195; and  dagger Monoclonal Antibody Core Facility, Hope Heart Institute, Seattle, Washington 98104

The matricellular protein thrombospondin 2 (TSP2) regulates a variety of cell-matrix interactions. A prominent feature of TSP2-null mice is increased microvascular density, particularly in connective tissues synthesized after injury. We investigated the cellular basis for the regulation of angiogenesis by TSP2 in cultures of murine and human fibroblasts and endothelial cells. Fibroblasts isolated from murine and human dermis synthesize TSP2 mRNA and secrete significant amounts of immunoreactive TSP2, whereas endothelial cells from mouse lung and human dermis did not synthesize TSP2 mRNA or protein. Recombinant mouse TSP2 inhibited growth of human microvascular endothelial cells (HMVECs) mediated by basic fibroblast growth factor, insulin-like growth factor-1, epidermal growth factor, and vascular endothelial growth factor (VEGF). HMVECs exposed to TSP2 in the presence of these growth factors had a decreased proportion of cells in S and G2/M phases. HMVECs cultured with a combination of basic fibroblast growth factor, insulin-like growth factor-1, and epidermal growth factor displayed an increased proportion of nonviable cells in the presence of TSP2, but the addition of VEGF blocked this TSP2-mediated impairment of cell viability. TSP2-mediated inhibition of DNA synthesis by HMVECs in the presence of VEGF was not affected by the broad-spectrum caspase inhibitor zVAD-fmk. Similar findings were obtained with TSP1. Taken together, these observations indicate that either TSP2 or TSP1 can inhibit HMVEC proliferation by inhibition of cell cycle progression and induction of cell death, but the mechanisms responsible for TSP2-mediated inhibition of cell cycle progression are independent from those leading to cell death.

§ Corresponding author. E-mail address: bornsten{at}u.washington.edu.

Molecular Biology of the Cell
Vol. 13, 1893-1905, June 2002
Copyright © 2002 by The American Society for Cell Biology


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