Alteration of Egr-1 mRNA during multistage carcinogenesis in mouse skin

✍ Scribed by Penny K. Riggs; Okkyung Rho; John DiGiovanni

• Publisher: John Wiley and Sons
• Year: 2000
• Tongue: English
• Weight: 130 KB
• Volume: 27
• Category: Article
• ISSN: 0899-1987
• DOI: 10.1002/(sici)1098-2744(200004)27:4<247::aid-mc1>3.0.co;2-4

✦ Synopsis

Immediate early genes, including fos, jun, and early growth response-1 (Egr-1), are induced during cellular response to changes in extracellular environment. These immediate early genes are believed to mediate processes of cell growth and differentiation. In particular, Egr-1 is induced during mitogenic stimulation of a variety of cell types, including fibroblasts, B cells, and epithelial cells. In the present study, we examined Egr-1 gene expression during multistage carcinogenesis in mouse skin. After a single topical treatment with the tumor promoter 12-O-tetradecanoylphorbol-13-acetate (TPA) to SENCAR mouse skin, Egr-1 mRNA was induced, and maximal induction was observed at 2 h in both epidermis and dermis. Induction of Egr-1 mRNA by TPA was inhibited by fluocinolone acetonide, a potent inhibitor of tumor promotion by TPA. Egr-1 mRNA was present in primary keratinocytes derived from adult SENCAR mice. The keratinocyte cultures were maintained in low Ca 2 medium, and Egr-1 mRNA levels became significantly elevated after the cultures were switched to high Ca 2 medium. Additionally, a large proportion of primary papillomas and carcinomas generated from SENCAR mice by standard initiation-promotion regimens exhibited elevated Egr-1 mRNA compared with normal epidermis. Taken together, these data suggest a possible role of Egr-1 during multistage carcinogenesis in mouse skin.