Expression and function of hypoxia inducible factor-1 alpha in human melanoma under non-hypoxic conditions.

Molecular Cancer
Caroline N MillsRichard M Niles

Abstract

Hypoxia inducible factor-1 alpha (HIF-1alpha) protein is rapidly degraded under normoxic conditions. When oxygen tensions fall HIF-1alpha protein stabilizes and transactivates genes involved in adaptation to hypoxic conditions. We have examined the normoxic expression of HIF-1alpha RNA and protein in normal human melanocytes and a series of human melanoma cell lines isolated from radial growth phase (RGP), vertical growth phase (VGP) and metastatic (MET) melanomas. HIF-1alpha mRNA and protein was increased in RGP vs melanocytes, VGP vs RGP and MET vs VGP melanoma cell lines. We also detected expression of a HIF-1alpha mRNA splice variant that lacks part of the oxygen-dependent regulation domain in WM1366 and WM9 melanoma cells. Over-expression of HIF-1alpha and its splice variant in the RGP cell line SbCl2 resulted in a small increase in soft agar colony formation and a large increase in matrigel invasion relative to control transfected cells. Knockdown of HIF-1alpha expression by siRNA in the MET WM9 melanoma cell line resulted in a large decrease in both soft agar colony formation and matrigel invasion relative to cells treated with non-specific siRNA. There is a high level of ERK1/2 phosphorylation in WM9 cells, indicating a...Continue Reading

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Citations

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Methods Mentioned

BETA
ubiquitination
acetylation
PCR
transfection
Assay
protein assay

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