Estrogen stimulates transcription of c-jun protooncogene

Molecular Endocrinology
A WeiszF Bresciani

Abstract

Estrogen is a mitogen for the rat uterus, where it induces transient activation of c-fos and c-myc protooncogene expression, followed by increases in DNA synthesis and cell proliferation. JUN-C, the product of the c-jun protooncogene, is a nuclear protein that can interact with FOS to modulate the activity of AP-1-responsive promoters. To test whether c-jun is a target for estrogen regulation, we measured the effects of 17 beta-estradiol on the expression of this gene in rat uterus. A human c-jun cDNA probe detects in rat uterus two mRNA species of 2.5 and 3.2 kilobases. Treatment of the animals with estrogen results in a rapid transient increase in the concentrations of these mRNAs; a 4- to 5-fold increase over the prestimulation level was detected starting 30 min after estrogen injection and lasting for 2 h, with a return to the prestimulation level after 4 h. In accordance with the results obtained by analysis of the mRNA, we found that estrogen increases 3- to 4-fold c-jun gene transcription in the uterus, at the same time it induces its mRNA accumulation. The ability of estrogen to induce c-jun gene expression was not abolished by the protein synthesis inhibitor cycloheximide, suggesting that transcriptional activation of ...Continue Reading

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