A multiple cytokine- and second messenger-responsive element in the enhancer of the human interleukin-6 gene: similarities with c-fos gene regulation.

Molecular and Cellular Biology
A RayP B Sehgal

Abstract

Interleukin-6 (IL-6) is a major systemic alarm signal that indicates the occurrence of tissue damage. The IL-6 gene is induced in various cell types by serum, inflammation-associated cytokines, viruses, and second-messenger agonists. There is an overall functional similarity between IL-6 and c-fos promoters, since transfection of excess amounts of either promoter DNA into intact HeLa cells modulates the function of the heterologous promoter construct. Furthermore, the transcription regulatory factor Fos transrepresses both the IL-6 and c-fos promoters. The 115-base pair (bp) region from -225 to -111 in the IL-6 5'-flanking region, which shares nucleotide sequence similarity with the c-fos serum response (SRE) and adjacent AP-1-like (the CGTCA motif) elements, confers responsiveness to several reagents, including serum, forskolin, and phorbol ester, upon the heterologous herpesvirus thymidine kinase (TK) promoter. In gel shift assays using nuclear extracts from HeLa cells, the 115-bp IL-6 enhancer formed several complexes that (i) were increased when extracts from induced HeLa cells were used and (ii) were inhibited most efficiently by the fos E DNA fragment (-700 to -100) and by c-fos oligonucleotides containing an intact AP-1-...Continue Reading

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