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- W2000953793 abstract "There is growing evidence that nitric oxide serves as a neurotransmitter released from enteric inhibitory nerves in the gastrointestinal tract. The distribution of nitric oxide synthase suggests that nitric oxide may also be a neurotransmitter within enteric ganglia. Since many actions of nitric oxide are mediated by stimulation of soluble guanylate cyclase and a subsequent increase in 3',5'-cyclic guanosine monophosphate (cGMP) concentration, targets for nitric oxide in the canine proximal colon were investigated by immunohistochemical localization of cGMP. In the presence of phosphodiesterase inhibitors (M&B 22948, 100 microM and 3-isobutyl-1-methyl-xanthine, 1 mM), exogenous nitric oxide and electrical field stimulation caused an accumulation of cGMP-like immunoreactivity in several cell-types including colonic smooth muscle cells. cGMP-like immunoreactivity was also observed in a subpopulation of neurons in both myenteric and submucosal ganglia. Sequential labeling with the NADPH diaphorase technique showed that 94% of neurons that responded to exogenous nitric oxide with an increase in cGMP-like immunoreactivity were NADPH diaphorase negative. None of the myenteric neurons that responded to electrical field stimulation with an increase in cGMP-like immunoreactivity were NADPH diaphorase positive, and only one submucosal neuron with cGMP-like immunoreactivity was also NADPH diaphorase positive. The electrical field-stimulated increase in cGMP-like immunoreactivity was blocked by nitroarginine (100 microM). An increase in cGMP-like immunoreactivity also occurred in interstitial cells located at the submucosal surface of the circular muscle layer. These cells are interposed between nerve varicosities and smooth muscle cells and may partially mediate neuromuscular transmission. Sodium nitroprusside and nitric oxide also caused an accumulation of cGMP-like immunoreactivity in smooth muscle cells of intramural arterioles and venules. The results of this study further support the role of nitric oxide as a neurotransmitter in colonic muscles, and provide support for the hypothesis that interstitial cells are functionally innervated by enteric inhibitory neurons. The data also suggest that nitric oxide may serve as a neurotransmitter in enteric ganglia." @default.
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- W2000953793 date "1993-09-01" @default.
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- W2000953793 title "Immunohistochemical localization of 3',5'-cyclic guanosine monophosphate in the canine proximal colon: Responses to nitric oxide and electrical stimulation of enteric inhibitory neurons" @default.
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- W2000953793 doi "https://doi.org/10.1016/0306-4522(93)90350-o" @default.
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