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The Journal of Immunology, 2003, 171: 1085-1093.
Copyright © 2003 by The American Association of Immunologists

Osteopontin (Eta-1) and Fibroblast Growth Factor-2 Cross-Talk in Angiogenesis1

Daria Leali*, Patrizia Dell’Era*, Helena Stabile*, Barbara Sennino*, Ann F. Chambers{dagger}, Antonella Naldini{ddagger}, Silvano Sozzani*, Beatrice Nico§, Domenico Ribatti§ and Marco Presta2,*

* Unit of General Pathology and Immunology, Department of Biomedical Sciences and Biotechnology, University of Brescia, Brescia, Italy; {dagger} Department of Oncology, London Regional Cancer Center, London, Ontario, Canada; {ddagger} Department of Physiology; University of Siena, Siena, Italy; and § Department of Human Anatomy and Histology, University of Bari, Bari, Italy

The cytokine/extracellular matrix protein osteopontin (OPN/Eta-1) is an important component of cellular immunity and inflammation. It also acts as a survival, cell-adhesive, and chemotactic factor for endothelial cells. Here, subtractive suppression hybridization showed that serum-deprived murine aortic endothelial (MAE) cells transfected with the angiogenic fibroblast growth factor-2 (FGF2) overexpress OPN compared with parental cells. This was confirmed by Northern blotting and Western blot analysis of the conditioned media in different clones of endothelial cells overexpressing FGF2 and in endothelial cells treated with the recombinant growth factor. In vivo, FGF2 caused OPN expression in newly formed endothelium of the chick embryo chorioallantoic membrane (CAM) and of murine s.c. Matrigel plug implants. Recombinant OPN (rOPN), the fusion protein GST-OPN, and the deletion mutant GST-{Delta}RGD-OPN were angiogenic in the CAM assay. Angiogenesis was also triggered by OPN-transfected MAE cells grafted onto the CAM. OPN-driven neovascularization was independent from endothelial {alpha}v{beta}3 integrin engagement and was always paralleled by the appearance of a massive mononuclear cell infiltrate. Accordingly, rOPN, GST-OPN, GST-{Delta}RGD-OPN, and the conditioned medium of OPN-overexpressing MAE cells were chemotactic for isolated human monocytes. Also, rOPN triggered a proangiogenic phenotype in human monocytes by inducing the expression of the angiogenic cytokines TNF-{alpha} and IL-8. OPN-mediated recruitment of proangiogenic monocytes may represent a mechanism of amplification of FGF2-induced neovascularization during inflammation, wound healing, and tumor growth.




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