Abstract
Bradykinin B1 receptor (BKB1R) is involved in a variety of pathophysiological processes, particularly those related to inflammation. The gene for this receptor is known to be upregulated by interleukin (IL)-1beta, a proinflammatory cytokine. However, the molecular mechanisms involved in the regulation of the BKB1R gene expression have not been defined. We demonstrated that IL-1beta induces a rapid increase in BKB1R mRNA level and the binding of desArg10-kallidin in human embryo lung fibroblasts (IMR90). This increase in BKB1R mRNA level is protein synthesis-independent as indicated by treatment of cells with cycloheximide (CHX) or puromycin (PUR). By testing the IL-1beta effect on BKB1R mRNA degradation, we showed that the IL-1beta upregulation of BKB1R expression is achieved through both transcriptional activation and post-transcriptional mRNA stabilization. In addition to the IL-1beta effects, translation inhibitors, CHX and PUR increase the steady state BKB1R mRNA level by inhibiting BKB1R mRNA degradation. Removal of the CHX block with subsequent resumption of protein synthesis results in a sizable increase of desArg10-kallidin binding. Using signalling pathway inhibitors, we show that IL-1beta functions through a protein tyrosine kinase, not protein kinase C or protein kinase A. However, activation of protein kinase C by phorbol 12-myristate 13-acetate increases the level of BKB1R mRNA and the binding of desArg10-kallidin. This increase is blocked by NF-kappaB activation inhibitors.
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