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J. Biol. Chem., Vol. 281, Issue 36, 26069-26080, September 8, 2006

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CD47 Is Necessary for Inhibition of Nitric Oxide-stimulated Vascular Cell Responses by Thrombospondin-1^*

Jeff S. Isenberg, Lisa A. Ridnour, Julie Dimitry^¶, William A. Frazier^¶, David A. Wink, and David D. Roberts¹

From the Laboratory of Pathology and Radiation Biology Branch, Center for Cancer Research, NCI, National Institutes of Health, Bethesda, Maryland 20892 and the ^¶Department of Biochemistry and Molecular Biophysics, Washington University School of Medicine, St. Louis, Missouri 63110

CD36 is necessary for inhibition of some angiogenic responses by the matricellular glycoprotein thrombospondin-1 and is therefore assumed to be the receptor that mediates its anti-angiogenic activities. Although ligation of CD36 by antibodies, recombinant type 1 repeats of thrombospondin-1, or CD36-binding peptides was sufficient to inhibit nitric oxide (NO)-stimulated responses in both endothelial and vascular smooth muscle cells, picomolar concentrations of native thrombospondin-1 similarly inhibited NO signaling in vascular cells from wild-type and CD36-null mice. Ligation of the thrombospondin-1 receptor CD47 by recombinant C-terminal regions of thrombospondin-1, thrombospondin-1 peptides, or CD47 antibodies was also sufficient to inhibit NO-stimulated phenotypic responses and cGMP signaling in vascular cells. Thrombospondin-1 did not inhibit NO signaling in CD47-null vascular cells or NO-stimulated vascular outgrowth from CD47-null muscle explants in three-dimensional cultures. Furthermore, the CD36-binding domain of thrombospondin-1 and anti-angiogenic peptides derived from this domain failed to inhibit NO signaling in CD47-null cells. Therefore, ligation of either CD36 or CD47 is sufficient to inhibit NO-stimulated vascular cell responses and cGMP signaling, but only CD47 is necessary for this activity of thrombospondin-1 at physiological concentrations.

Received for publication, May 25, 2006 , and in revised form, July 11, 2006.

^* This work was supported by the Intramural Research Program of the NCI, National Institutes of Health (NIH), Center for Cancer Research (to D. D. R. and D. A. W.) and NIH Grants HL54390 and GM57573 (to W. A. F.). The costs of publication of this article were defrayed in part by the payment of page charges. This article must therefore be hereby marked "advertisement" in accordance with 18 U.S.C. Section 1734 solely to indicate this fact.

¹ To whom correspondence should be addressed: Laboratory of Pathology, Center for Cancer Research, NCI, NIH, Bldg. 10, Rm. 2A33, 10 Center Dr., MSC1500, Bethesda, MD 20892-1500. Tel.: 301-496-6264; Fax: 301-402-0043; E-mail: droberts{at}helix.nih.gov.

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