1. Stromal cell-derived factor-1 stimulates vasculogenesis and enhances Ewing's sarcoma tumor growth in the absence of vascular endothelial growth factor.
- Author
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Reddy K, Zhou Z, Jia SF, Lee TH, Morales-Arias J, Cao Y, and Kleinerman ES
- Subjects
- Adenoviridae genetics, Animals, Antigens, CD34 biosynthesis, Becaplermin, Bone Marrow Cells pathology, Cell Growth Processes drug effects, Cell Growth Processes physiology, Cell Movement drug effects, Chemokine CXCL12 biosynthesis, Chemokine CXCL12 genetics, Endothelium, Vascular pathology, Female, Humans, Mice, Mice, Inbred BALB C, Mice, Nude, Neovascularization, Pathologic genetics, Neovascularization, Pathologic metabolism, Neovascularization, Pathologic pathology, Pericytes pathology, Platelet-Derived Growth Factor biosynthesis, Platelet-Derived Growth Factor genetics, Proto-Oncogene Proteins c-sis, Recombinant Proteins pharmacology, Sarcoma, Ewing genetics, Sarcoma, Ewing pathology, Transfection, Up-Regulation, Vascular Endothelial Growth Factor A antagonists & inhibitors, Vascular Endothelial Growth Factor A biosynthesis, Vascular Endothelial Growth Factor A genetics, Vascular Endothelial Growth Factor A metabolism, Chemokine CXCL12 pharmacology, Sarcoma, Ewing blood supply, Vascular Endothelial Growth Factor A deficiency
- Abstract
Stromal cell-derived Factor-1alpha (SDF-1alpha) stimulates the migration of bone marrow (BM) cells, similar to vascular endothelial growth factor (VEGF). We previously demonstrated that inhibition of VEGF(165) by small interfering RNA inhibited Ewing's sarcoma tumor growth, tumor vessel formation and recruitment of BM cells to the tumor. To determine the importance of BM cells in tumor vessel development, we investigated the effects of SDF-1alpha on VEGF-inhibited TC/siVEGF(7-1) Ewing's tumor neovasculature formation and growth. The effect of SDF-1alpha on CD34(+) progenitor cell chemotaxis was determined in vivo. Using a BM transplantation model with GFP(+) transgenic mice as BM donors and nude mice as recipients, we evaluated the effect of SDF-1alpha on the recruitment of BM-derived cells to VEGF(165)-inhibited TC/siVEGF(7-1) tumors, as well as its effect on neovasculature development, vessel morphology and tumor growth. SDF-1alpha stimulated the migration of CD34(+) progenitor cells to Matrigel plugs in vivo and promoted the retainment of BM-derived pericytes in close association with perfused, functional tumor vessels. Intratumor inoculation of Ad-SDF-1alpha into TC/siVEGF(7-1) tumors resulted in increased SDF-1 and PDGF-BB expression, augmented tumor growth, an increase in the number of large, lumen-bearing vascular structures, and enhanced vessel pericyte coverage, with no change in VEGF(165). SDF-1alpha stimulates BM cell chemotaxis and the association of these cells with functional tumor vessels. Furthermore, SDF-1alpha enhances tumor neovascularization and growth with no alteration in VEGF(165). Our work suggests that SDF-1-mediated vasculogenesis may represent an alternate pathway that could potentially be utilized by tumors to sustain growth and neovasculature expansion after anti-VEGF therapy., ((c) 2008 Wiley-Liss, Inc.)
- Published
- 2008
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