Pancreatic Cancer Research Today is a free monthly online journal that collates and summarizes the latest research about Pancreatic Cancer, including details on symptoms, causes, treatment, information.

Regulation of vascular endothelial growth factor receptor-2 expression in pancreatic cancer cells by Sp proteins.

Higgins KJ, Abdelrahim M, Liu S, Yoon K, Safe S

Department of Biochemistry and Biophysics, Texas A&M University, College Station, TX, USA.

Vascular endothelial growth factor receptor-2 (VEGFR2/KDR) is an important mediator of angiogenesis, and VEGFR2 mRNA is expressed in several pancreatic cancer cell lines. Deletion analysis of the VEGFR2 promoter in Panc-1, AsPC-1, and MiaPaCa-2 pancreatic cancer cells shows that the proximal region of the promoter is primarily responsible for VEGFR2 expression, and two GC-rich sites at -58 and -44 are critical elements in all three cell lines. Panc-1, AsPC-1, and MiaPaCa-2 cells also express Sp1, Sp3, and Sp4 proteins which bind to the GC-rich region of the VEGFR2 promoter in electrophoretic mobility shift and chromatin immunoprecipitation assays. RNA interference with small inhibitory RNAs for Sp1, Sp3, and Sp4 decreases VEGFR2 mRNA and reporter gene activity in transfection assays, confirming that VEGFR2 expression in pancreatic cancer cells is regulated by Sp proteins. These results suggest that VEGFR2 cannot only be targeted by receptor tyrosine kinase inhibitors but also by drugs that downregulate Sp proteins or block Sp-dependent transactivation.

Published 17 May 2006 in Biochem Biophys Res Commun, 345(1): 292-301.
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