PubMed:1541828 JSONTXT

{"target":"https://pubannotation.org/docs/sourcedb/PubMed/sourceid/1541828","sourcedb":"PubMed","sourceid":"1541828","source_url":"http://www.ncbi.nlm.nih.gov/pubmed/1541828","text":"T cell-specific negative regulation of transcription of the human cytokine IL-4.\nIL-4 secreted by activated T cells is a pleiotropic cytokine affecting growth and differentiation of diverse cell types such as T cells, B cells, and mast cells. We investigated the upstream regulatory elements of the human IL-4 promoter. A novel T cell-specific negative regulatory element (NRE) composed of two protein-binding sites were mapped in the 5' flanking region of the IL-4 gene: -311CTCCCTTCT-303 (NRE-I) and -288CTTTTTGCTT-TGC-300 (NRE-II). A T cell-specific protein Neg-1 and a ubiquitous protein Neg-2 binding to NRE-I and NRE-II, respectively, were identified. Furthermore, a positive regulatory element was found 45 bp downstream of the NRE. The enhancer activity of the PRE was completely suppressed when the NRE was present. These data suggest that IL-4 promoter activity is normally down-regulated by an NRE via repression of the enhancer positive regulatory element. These data may have implications for the stringent control of IL-4 expression in T 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