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- W2023353218 abstract "5-lipoxygenase (5LO) catalyzes formation of leukotrienes, mediators with roles in several inflammatory disorders, including atherosclerosis. The human 5LO gene promoter contain multiple GC-boxes. The relevance of these for expression of 5LO in the human monocytic cell line Mono Mac 6 (MM6) was studied. A downregulating effect of the GC-box binding compound mithramycin indicated that GC-rich sequences in the 5LO gene promoter are important for expression of native 5LO. In DNase I footprinting, mithramycin and Sp1 protected known GC-boxes, but also a novel Sp1 binding site was found, comprising 20 bp upstream of the major transcription initiation site, beside an Initiator-like sequence. Mutation of this site reduced Sp1 binding and expression of reporter genes in MM6 cells, compatible with a function as basal promoter element for the TATA-less 5LO gene. When differentiation was induced by TGFbeta and vitamin D(3), 5LO expression became prominent, but expression levels of Sp1/3 and Egr-1 were the same as for control cells. Also, 5LO reporter gene activity in transiently transfected MM6 cells was insensitive to differentiation. Thus, the GC-rich part of the 5LO gene promoter, including a novel Sp1 site, appear important for basal (rather than upregulated) transcription of 5LO in MM6 cells." @default.
- W2023353218 created "2016-06-24" @default.
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- W2023353218 date "2005-12-30" @default.
- W2023353218 modified "2023-10-05" @default.
- W2023353218 title "GC-rich sequences in the 5-lipoxygenase gene promoter are required for expression in Mono Mac 6 cells, characterization of a novel Sp1 binding site" @default.
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- W2023353218 doi "https://doi.org/10.1016/j.bbalip.2005.11.008" @default.
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