Inhibition of inducible nitric oxide synthase delays gastric ulcer healing in the rat.

Abstract:

:We sought to clarify the role of nitric oxide (NO) generated from inducible NO synthase (iNOS) during healing of rat gastric ulcers. After gastric ulcers were induced by acetic acid, rats were treated with vehicle, N(G)-nitro-L-arginine methyl ester (L-NAME), aminoguanidine (AG), and dexamethasone (Dex) by gastric intubation twice a day for 3 days to 1 week. L-NAME significantly delayed healing compared with vehicle. AG and Dex significantly reduced ulcer size 3 days after ulcer induction but did not further reduce ulcer size 1 week after induction. iNOS expression was present in inflammatory cells, some epithelial cells, and in vascular smooth muscle in the regenerating mucosa of the vehicle-treated group. However, the number of iNOS-positive inflammatory cells increased in the AG- and L-NAME-treated groups. AG and L-NAME significantly increased the number of inflammatory cells with endogenous peroxidase and significantly reduced the number of apoptotic inflammatory cells compared with vehicle. In conclusion, inhibition of iNOS increases the number of inflammatory cells in the ulcer margin and delays ulcer healing. These observations suggest that NO generated from iNOS not only participates in ulcer formation but also plays a beneficial role in ulcer healing, in part by the exclusion of iNOS-positive inflammatory cells from the regenerating mucosa.

journal_name

J Clin Gastroenterol

authors

Akiba Y,Nakamura M,Mori M,Suzuki H,Oda M,Kimura H,Miura S,Tsuchiya M,Ishii H

doi

10.1097/00004836-199800001-00011

subject

Has Abstract

pub_date

1998-01-01 00:00:00

pages

S64-73

eissn

0192-0790

issn

1539-2031

journal_volume

27 Suppl 1

pub_type

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