TY - JOUR T1 - Role of Nuclear Factor-κB and Protein Kinase C Signaling in the Expression of the Kinin B<sub>1</sub> Receptor in Human Vascular Smooth Muscle Cells JF - Molecular Pharmacology JO - Mol Pharmacol SP - 949 LP - 956 DO - 10.1124/mol.106.030684 VL - 71 IS - 3 AU - Marie Eve Moreau AU - Marie-Thérèse Bawolak AU - Guillaume Morissette AU - Albert Adam AU - François Marceau Y1 - 2007/03/01 UR - http://molpharm.aspetjournals.org/content/71/3/949.abstract N2 - Kinin B1 receptor expression was characterized in human umbilical artery smooth muscle cells to further elucidate the function and specificity of three previously proposed pathways [nuclear factor-κB (NF-κB), protein kinase C, and agonist autoregulation] that regulate this inducible G protein-coupled receptor. Radioligand binding assays, real-time reverser transcription/polymerase chain reaction with an optional actinomycin D treatment period, and NF-κB immunofluorescence were primarily employed in these primary cell cultures. Various stimulatory compounds that increase receptor mRNA stability only (human and bovine sera, cycloheximide) or that stimulate NF-κB nuclear translocation and both mRNA concentration and stability [interleukin (IL)-1β, phorbol 12-myristate 13-acetate (PMA)] all increased the density of binding sites for the tritiated B1 receptor agonist [3H]Lys-des-Arg9-bradykinin (without change in receptor affinity) in cell-based assays. Small interfering RNA assays indicated that NF-κB p65 is necessary for the effective expression of the cell surface B1 receptor under basal or IL-1β, fetal bovine serum (FBS), or PMA stimulation conditions. Dexamethasone cotreatment reproduced these effects. IL-1β-, FBS-, or PMA-induced stabilization of B1 receptor mRNA was inhibited by the addition of the protein kinase C inhibitor 3-[1-[3-(dimethylamino)propyl]-1H-indol-3-yl]-4-(1H-indol-3-yl)-1H-pyrrole-2,5-dione monohydrochloride (GF-109203x), which also diminished the Bmax under FBS or PMA treatment. Lys-des-Arg9-bradykinin had little effect on NF-κB activation, the Bmax, or receptor mRNA abundance or stability. Both NF-κB and protein kinase C signaling are required for the effective expression of the kinin B1 receptor in human umbilical artery smooth muscle cells. The American Society for Pharmacology and Experimental Therapeutics ER -