The short-chain fatty acid receptor GPR43 is transcriptionally regulated by XBP1 in human monocytes.

ABSTRACT: G-protein coupled receptor 43 (GPR43) recognizes short chain fatty acids and is implicated in obesity, colitis, asthma and arthritis. Here, we present the first full characterization of the GPR43 promoter and 5'-UTR. 5'-RACE of the GPR43 transcript identified the transcription start site (TSS) and a 124 bp 5'-UTR followed by a 1335 bp intron upstream of the ATG start codon. The sequence spanning -4560 to +68 bp relative to the GPR43 TSS was found to contain strong promoter activity, increasing luciferase reporter expression by >100-fold in U937 monocytes. Stepwise deletions further narrowed the putative GPR43 promoter (-451 to +68). Site-directed mutagenesis identified XBP1 as a core cis element, the mutation of which abrogated transcriptional activity. Mutations of predicted CREB, CHOP, N

SUBMITTER: Ang Z 

PROVIDER: S-EPMC4311239 | biostudies-literature | 2015 Jan

REPOSITORIES: biostudies-literature