PMID: 9664135Jul 17, 1998Paper

Normalization of EGFR mRNA levels following restoration of wild-type p53 in a head and neck squamous cell carcinoma cell line

International Journal of Oncology
J R GrandisD J Tweardy

Abstract

Head and neck squamous cell carcinoma (HNSCC) is frequently characterized by mutation of the p53 tumor suppressor gene and increased expression of the epidermal growth factor receptor (EGFR). To determine the potential link between p53 and EGFR expression, we examined the effect of overexpressing wild-type p53 on EGFR mRNA levels in HNSCC. In these studies, a temperature-sensitive (ts) p53 mutant was transfected into an HNSCC line which contained a deletion of one allele of the p53 gene and a mutation of the remaining allele. Following selection, six clones were isolated, characterized by Southern blot analysis, and stable expression of mutant p53 protein was confirmed by immunoblotting of clones grown at the mutant temperature. Total RNA was isolated from transfectants grown at both wild-type or mutant temperatures followed by Northern blot analysis to determine levels of EGFR mRNA expression at the two p53 conformations. Clones grown at the wild-type temperature (32.5 degreesC) demonstrated a 69% 13% decrease in EGFR mRNA compared with the same cells grown at the mutant temperature (39.5 degreesC; p=0.006) indicating that restoration of wild-type p53 reduces EGFR mRNA levels in this HNSCC cell line. These findings suggest tha...Continue Reading

Citations

Oct 13, 2005·Journal of Clinical Oncology : Official Journal of the American Society of Clinical Oncology·Deirdre O'MahonyMartin E Gutierrez
Jun 10, 2006·Journal of Clinical Oncology : Official Journal of the American Society of Clinical Oncology·Shailaja Kalyankrishna, Jennifer R Grandis

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