Abstract
We investigated the presence of β3-adrenoceptor and its functional effects on pacemaker potentials in colonic interstitial cells of Cajal (ICCs) from mice. The whole-cell patch clamp technique was used to record pacemaker potentials in cultured ICCs and reverse transcription polymerase chain reaction (RT-PCR) was performed to detect the mRNA transcript levels β-adrenoceptors. The β3-adrenoceptor agonist, BRL37344, reduced the frequency of pacemaker potentials in a concentration-dependent manner. The inhibitory effects of BRL37344 were blocked by the pretreatment of propranolol, a nonspecific β-adrenoceptor antagonist, but not by the selective β1-adrenoceptor antagonist atenolol and the selective β2-adrenoceptor antagonist butoxamine. β3-adrenoceptor antagonists SR59230A and L748337 blocked the inhibitory effects of BRL37344. RT-PCR revealed mRNA transcripts of β1- and β3-adrenoceptor, but not β2-adrenoceptor, in c-kit- and Ano-1-positive colonic ICCs. The K(+) channel blockers tetraethylammonium, apamin, and glibenclamide did not block the effects of BRL37344. N(ω)-Nitro-l-arginine methyl ester hydrochloride (L-NAME), an NO synthase inhibitor, and chelerythrine, a protein kinase C inhibitor, also did not block the effects of BR...Continue Reading
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