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• W2094670345 abstract "Nitric oxide (NO) is a cotransmitter of inhibitory motor neurons of the enteric nervous system. This study examined the effect of 7-nitroindazole (7-NI), an inhibitor of neuronal NO synthase (NOS), on intestinal peristalsis and muscle activity and compared 7-NI with N(G)-nitro-L-arginine methyl ester (L-NAME), a nonselective inhibitor of NOS isoforms. Peristalsis in isolated segments of the guinea pig small intestine was triggered by a perfusion-induced rise of the intraluminal pressure. While L-NAME (10-300 micromol/l) lowered the peristaltic pressure threshold (PPT) at which propulsive muscle contractions were elicited, 7-NI (10-300 micromol/l) caused a concentration-related increase in PPT. L-Arginine (1-3 mmol/l) failed to reverse peristaltic motor depression evoked by 7-NI but annulled the L-NAME-evoked stimulation of peristalsis. Drugs which stimulated peristalsis, such as L-NAME, naloxone, apamin and suramin plus pyridoxal phosphate-6-azophenyl-2'-4'-disulphonic acid counteracted the inhibitory effect of submaximally effective concentrations of 7-NI on peristalsis. 7-NI (100-300 micromol/l) inhibited circular muscle contractions evoked by cholecystokinin octapeptide, the NK(1) receptor agonist GR-73,632 and indomethacin whereas L-NAME (100-300 micromol/l) failed to inhibit any drug-evoked contraction. These data show that 7-NI, unlike L-NAME, inhibits circular muscle contractions of the gut and depresses intestinal peristalsis. It is concluded that the inhibitory motor action of 7-NI is unrelated to inhibition of neuronal NOS and arises from depression of smooth muscle activity." @default.
• W2094670345 created "2016-06-24" @default.
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• W2094670345 date "1999-01-01" @default.
• W2094670345 modified "2023-09-27" @default.
• W2094670345 title "Intestinal Motor Depression by 7-Nitroindazole through an Action Unrelated to Nitric Oxide Synthase Inhibition" @default.
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• W2094670345 doi "https://doi.org/10.1159/000028334" @default.
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