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• W2019931945 abstract "SUMMARY In the present study, the role of nitric oxide (NO) produced by constitutive and inducible nitric oxide synthases (cNOS and iNOS, resepctively) on the contraction and relaxation of fundus in normal and lipopolysaccharide (LPS)‐treated mice was examined. A whole fundic ring isolated from mice pretreated with reserpine was mounted in an organ bath containing Krebs’ solution with 0.001 mmol/L atropine. Rings were contracted initially by 5‐hydroxytryptamine (5‐HT; 0.03 mmol/L) before relaxation was induced using ATP (0.03 mmol/L), ADP (0.03 mmol/L), pentoxifylline (0.002 mmol/L), electrical field stimulation (EFS; 50 V, 1 msec, 50 Hz, 3 min) and l ‐arginine (0.05 mmol/L). All drugs and EFS induced significant relaxation of isolated rings. The relaxations induced were significantly inhibited by N G ‐nitro‐ l ‐arginine methyl ester ( l ‐NAME; 1.0 mmol/L). However, the iNOS inhibitors l ‐ N 6 ‐(1‐iminoethyl) lysine hydrochloride ( l ‐NIL; 1.0 mmol/L) and amino guanidine (AMG; 1.0 mmol/L) had no significant effect on tissue relaxation. Then, the relaxant effects of 0.03 mmol/L ATP were tested on precontracted isolated fundic rings taken from 10 mg/kg LPS‐treated animals. The non‐selective NOS inhibitor l ‐NAME (10 mg/kg), the iNOS inhibitors l ‐NIL (3 mg/kg) and AMG (20 mg/kg) and betamethasone (0.1 mg/kg) were used to examine the role of NO produced by iNOS in the relaxation responses. It was found that the level of contraction induced by 0.03 mmol/L 5‐HT in rings isolated from LPS‐treated animals was significantly ( P < 0.5) less than that in rings from untreated mice. However, precontracted tissues from LPS‐treated mice were significantly relaxed by ATP and the relaxation response to ATP was significantly inhibited by l ‐NIL, ANG and betamethasone, but not by l ‐NAME. We suggest that, in LPS‐treated mice, the production of NO from iNOS produces a reduction in the contractile response, as well as a decrease in NO formation by cNOS, resulting in changes to smooth muscle cell function." @default.
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• W2019931945 date "2008-08-01" @default.
• W2019931945 modified "2023-10-12" @default.
• W2019931945 title "ROLE OF NITRIC OXIDE PRODUCED BY CONSTITUTIVE AND INDUCIBLE NITRIC OXIDE SYNTHASES IN THE MOUSE GASTRIC FUNDUS" @default.
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• W2019931945 doi "https://doi.org/10.1111/j.1440-1681.2008.04956.x" @default.
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