PMID: 9645958Jul 1, 1998Paper

Enhancement of beta-amyloid precursor protein transcription and expression by the soluble interleukin-6 receptor/interleukin-6 complex

Brain Research. Molecular Brain Research
G E RingheimC C Chao

Abstract

We investigated a potential role for the soluble interleukin-6 receptor (sIL-6R) in modulating interleukin-6 (IL-6) function in the central nervous system by assessing IL-6 and sIL-6R effects on beta-amyloid precursor protein (beta-APP) transcription and expression in cells of human neuronal origin. Cells transfected with a luciferase reporter plasmid containing a 3.8 kb DNA fragment of the beta-APP promoter were shown to have inducible promoter activity when treated with phorbol ester or basic fibroblast growth factor, but not when treated with lipopolysaccharide or Il-6. PCR amplification analysis revealed the presence of mRNA encoding the signaling subunit of the Il-6 receptor complex, the gp130 subunit, at levels approximating that found in human cortical tissue. The mRNA encoding the IL-6 receptor, however, was poorly expressed and was detectable only at high amplification cycles. When purified sIL-6R protein was added together with IL-6, there was a rapid induction of promoter activity within 2 h of stimulation followed by elevations in protein levels of both cell-associated and secreted beta-APP. Analysis of mRNA transcripts from human cortical brain tissue and cell cultures derived from fetal human brain demonstrated th...Continue Reading

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