Hypoxia occurs in most solid tumors as a result of inefficient vascular development and/or abnormal vascular architecture. During hypoxia, HIF-1 α acts as the primary transcription factor functioning to activate multiple target genes, including vascular endothelial growth factor (VEGF). Several studies have demonstrated that in tumors HIF-1 α mediates VEGF protein expression at the transcription level. We aimed to establish whether HCT116 colon cancer cell VEGF expression is regulated by HIF-1 levels after transient transfection with a GFP vector encoding the HIF-1α gene. HCT116 cell VEGF expression were therefore assayed by immunohistochemistry and ELISA. After transfection with phMGFP-HIF-1 α, VEGF immunostaining was significantly increased in transfected cells as compared with untransfected HCT116 cells (p=0.024, Student's t test); culture media VEGF levels assayed by ELISA were also significantly increased in transfected cells (p=0.008, Student's t-test). These data suggest that HIF-1 α may play an important role in colon cancer angiogenesis, both as a biomarker of metastatic potential and as a novel target for gene therapy.

Cell-cycle molecules in mesothelioma: an overview

BALDI, Alfonso
2007

Abstract

Hypoxia occurs in most solid tumors as a result of inefficient vascular development and/or abnormal vascular architecture. During hypoxia, HIF-1 α acts as the primary transcription factor functioning to activate multiple target genes, including vascular endothelial growth factor (VEGF). Several studies have demonstrated that in tumors HIF-1 α mediates VEGF protein expression at the transcription level. We aimed to establish whether HCT116 colon cancer cell VEGF expression is regulated by HIF-1 levels after transient transfection with a GFP vector encoding the HIF-1α gene. HCT116 cell VEGF expression were therefore assayed by immunohistochemistry and ELISA. After transfection with phMGFP-HIF-1 α, VEGF immunostaining was significantly increased in transfected cells as compared with untransfected HCT116 cells (p=0.024, Student's t test); culture media VEGF levels assayed by ELISA were also significantly increased in transfected cells (p=0.008, Student's t-test). These data suggest that HIF-1 α may play an important role in colon cancer angiogenesis, both as a biomarker of metastatic potential and as a novel target for gene therapy.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11591/164760
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