Abstract
1. Actions of histamine on the voltage-dependent Ba2+(Ca2+) currents (IBa, ICa) were investigated using the whole-cell patch-clamp technique on dispersed smooth muscle cells from the rabbit saphenous artery. 2. Histamine (half-maximal dose, EC50 = 530 nM) augmented the IBa evoked by a brief depolarizing pulse (100 ms duration; to +10 mV from a holding potential of -80 mV) in a concentration-dependent manner. The maximum augmentation was obtained with 30 microM-histamine (1.29 times control). This augmentation of IBa was inhibited by the H3-antagonist, thioperamide (Ki = 30 nM, slope of the Schild plot = 1.0), but not by H1- or H2-antagonists (mepyramine or diphenhydramine, or cimetidine, respectively). 3. An H3-agonist, R alpha-methylhistamine (EC50 = 93 nM), also augmented IBa in a concentration-dependent manner at a holding potential of -80 mV and the maximum augmentation (1.25 times control) was obtained with 10 microM. This augmentation was also inhibited by thioperamide, but not by the above H1- and H2- antagonists. 4. Intracellularly applied 500 microM-guanosine 5'-triphosphate (GTP) enhanced, but 1 mM-guanosine 5'-O-(2-thiodiphosphate) (GDP beta S) abolished, the histamine-induced augmentation of IBa. When one of the non-hydrolysable GTP analogues, guanosine 5'-O-(3-thiotriphosphate) (GTP gamma S; greater than 5 microM), guanylyl-imidodiphosphate (GMP-PNP; 200 microM) or guanylyl (beta, gamma-methylene)-diphosphonate (GMP-PCP; 1 mM) was intracellularly applied, the IBa amplitude evoked without the application of histamine was not affected, but the excitatory effect of histamine on IBa was reversed to an inhibition. Pre-treatment with pertussis toxin (PTX: 300 ng/ml and 3 micrograms/ml) did not modify the histamine-induced responses in the absence or presence of GTP gamma S. 5. 4 beta-Phorbol 12,13-dibutylate (PDBu) increased the amplitude of IBa. However, this action of PDBu was not enhanced by the application of GTP (500 microM) in the pipette, but additional application of histamine further increased the amplitude of IBa. Pre-treatment with a potent non-selective protein kinase inhibitor, 1-(5-isoquinolinesulphonyl)-2-methylpiperazine dihydrochloride (H-7; 100 microM), did not modify the histamine-induced current augmentation or inhibition observed in the presence or absence of intracellular GTP gamma S.(ABSTRACT TRUNCATED AT 400 WORDS)
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