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Early Growth Response-1 Gene Mediates Up-Regulation of Epidermal Growth Factor Receptor Expression during Hypoxia

Laboratory of Molecular Biology, Center for Cancer Research, National Cancer Institute, NIH, Bethesda, Maryland 20892-4255

Hypoxia occurs during development of cancers and is correlated with cancer progression. Hypoxia also induces epidermal growth factor receptor (EGFR) expression. The EGFR plays a vital role in cell growth, and its overexpression can lead to transformation. We sought to determine the regulator(s) of EGFR expression during hypoxia. We demonstrate that early growth response factor 1 (Egr-1), which is induced by hypoxia, can activate the basal transcriptional activity of the EGFR promoter. Egr-1 not only transactivates the EGFR promoter activity but also enhances endogenous EGFR expression. Using a series of EGFR promoter deletion mutants, we show that the region between -484 and -389, which contains a putative Egr-1 consensus motif, is crucial for EGFR transactivation by Egr-1. Electrophoretic mobility shift assays show that Egr-1 binds to the oligonucleotide containing this Egr-1 motif. Also, introduction of an antisense oligonucleotide for Egr-1 diminishes EGFR expression during hypoxia, indicating that the up-regulation of EGFR by hypoxia is mediated through Egr-1. Our results provide evidence that regulation of EGFR promoter activity by Egr-1 represents a mechanism for epidermal cell growth during hypoxia.

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