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[Cancer Research 63, 3919-3922, July 15, 2003]
© 2003 American Association for Cancer Research

Advances in Brief

SiRNA-mediated Inhibition of Vascular Endothelial Growth Factor Severely Limits Tumor Resistance to Antiangiogenic Thrombospondin-1 and Slows Tumor Vascularization and Growth1

Stéphanie Filleur2, Aurélie Courtin2, Slimane Ait-Si-Ali, Julien Guglielmi, Carole Merle, Annick Harel-Bellan, Philippe Clézardin and Florence Cabon3

CNRS UPR 9079, 94801 Villejuif, France [S. F., A. C., S. A-S-A., C. M., A. H-B., F. C.], and INSERM U403, Faculté Laennec, 69372 Lyon, France [J. G., P. C.]

In the past few years, several laboratories have developed antiangiogenic molecules that starve tumors by targeting their vasculature and we have shown that, when produced in tumors, the antiangiogenic molecule thrombospondin-1 (TSP1) reduces the vascularization and delays tumor onset. Yet over time, tumor cells producing active TSP1 do eventually form exponentially growing tumors. These tumors are composed of cells secreting unusually high amounts of the angiogenic stimulator vascular endothelial growth factor (VEGF) that are sufficient to overcome the inhibitory TSP1. Here, we use short double-stranded RNA (siRNA) to trigger RNA interference and thereby impair the synthesis of VEGF and ask if this inability to produce VEGF prevents the development of TSP1 resistance. Systemic in vivo administration of crude anti-VEGF siRNA reduced the growth of unaltered fibrosarcoma tumor cells, and when the anti-VEGF siRNA was expressed from tumor cells themselves, such inhibition was synergistic with the inhibitory effects derived from TSP1 secretion by the tumor cells. Anti-VEGF siRNA delayed the emergence of TSP1-resistant tumors and strikingly reduced their subsequent growth rate.




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