PubMed:7826623 JSONTXT

{"target":"https://pubannotation.org/docs/sourcedb/PubMed/sourceid/7826623","sourcedb":"PubMed","sourceid":"7826623","source_url":"http://www.ncbi.nlm.nih.gov/pubmed/7826623","text":"T-cell functional regions of the human IL-3 proximal promoter.\nThe human interleukin-3 (IL-3) gene is expressed almost exclusively in activated T cells. Its expression is regulated at both the transcriptional and post-transcriptional level. We have previously shown that treatment of Jurkat T cells with phytohemaglutinin (PHA) and the phorbol ester, PMA, activated transcription initiation from the IL-3 gene. To define the regions of the gene required for transcription activation, we generated a series of reporter constructs containing different regions of the IL-3 gene 5' and 3' flanking sequences. Both positive and negative regulatory elements were identified in the proximal 5' flanking region of the IL-3 gene. The promoter region between -173 and -60 contained the strongest activating elements. The transcription factor AP-1 could bind to this positive activator region of the promoter. We also examined the function of the IL-3 CK-1/CK-2 elements that are present in many cytokine genes and found that they acted as a repressor of basal level expression when cloned upstream of a heterologous promoter but were also inducible by 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