Further Studies Concerning Possible Transmitters from NANC Nerves in the Circular Muscle of the Rat Stomach Fundus
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概要
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We examined the characteristics of the non-adrenergic, non-cholinergic (NANC) inhibitory response of the circular muscle of the rat stomach fundus to transmural nerve stimulation or high K^+. Treatments with isotonic high K^+ (20mM), nitric oxide (NO) and sodium nitroprusside (SNP) all elevated cyclic GMP levels in the rat stomach fundus in the presence of atropine and guanethidine. Isotonic high K^+-induced formation of cyclic GMP was completely inhibited by tetrodotoxin (TTX) or N^G-nitro-L-arginine (L-NNA). The K^+ also increased cyclic AMP levels and this response was completely inhibited by TTX. Dose-dependent relaxation of the fundus in response to SNP was shifted to the right by a prior incubation with high concentration of SNP (10^<-4> M) for 2 hrs. Incubating the fundus with SNP for 2 hrs significantly inhibited NO-induced cyclic GMP formation. Relaxation responses to transmural stimulation (1Hz or 30Hz), isotonic high K^+ and NO were significantly reduced by a prior incubation with SNP. Isotonic high K^+ (20mM)-induced relaxation of circular muscle strips was not completely inhibited by combined treatment with 10^<-5> M L-NNA, 5×10^<-5> M oxyhemoglobin and anti-VIP (1:200). These results suggest that NO as well as VIP is possible transmitter from NANC nerves in the circular muscle of the rat stomach fundus and there should be one or more inhibitory mediators other than VIP and NO.
- 日本平滑筋学会の論文
著者
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KASUYA YUTAKA
Department of Chemical Pharmacology, Faculty of Pharmaceutical Sciences, University of Tokyo
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KAMATA Katsuo
Department of Pharmacology, School of Pharmacy, Hoshi University
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Kamata Katsuo
Department Of Pharmacology School Of Pharmacy Hoshi University:department Of Chemical Pharmacology F
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Kasuya Yutaka
Department Of Chemical Pharmacology Faculty Of Pharmaceutical Sciences The University Of Tokyo
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Kasuya Y
Department Of Physiology And Morphology Institute Of Medicinal Chemistry Hoshi University
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KOHZUKI Maya
Department of Physiology and Morphology, Institute of Medicinal Chemistry, Hoshi University
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Kohzuki Maya
Department Of Physiology And Morphology Institute Of Medicinal Chemistry Hoshi University
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KASUYA Yutaka
Department of Physiology and Morphology, Institute of Medicinal Chemistry, Hoshi University
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KAMATA Katsuo
Department of Chemical Pharmacology, Faculty of Pharmaceutical Sciences, Meijo University
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