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Nitric oxide levels in the intestines of mice submitted to ischemia and reperfusion: L-arginine effects.

Abstract：

OBJECTIVE:Usually an experimental necrotizing enterocolitis experimental model, we Investigated nitric oxide levels in intestinal tissues of newborn mice with or without l-arginine therapy during sessions of ischemia and reoxygenation. METHODS:Twenty-six newborn mice from the Wistar EPM-1 lineage, weighing from 4.5 to 6.2 g, were randomly assigned to three groups: G-I/R, hypoxia and reoxygenation; G-Arg, l-arginine treatment I/R; and G-CTL, controls. G-I/R and G-Arg mice underwent twice a day during their first 3 days of life exposure to gas chambers with 100% CO(2) for 5 minutes at 22 degrees C before reoxygenation with 100% O(2) for another 5 minutes. After 12 hours, all animals were sedated, laparotomized, and had samples of ileum and colon taken and- either formalin fixed histopathologic examinations or frozen to -80 degrees C for estimation of tissue nitric oxide levels. Intestinal injuries were classified according to the criteria of Chiu et al. RESULTS:The G-I/R and G-Arg groups showed injuries characteristic of necrotizing enterocolitis (NEC) with an improved structural preservation rate in G-Arg. The concentration of nitric oxide in the Ileum was much higher with G-Arg (16.5 +/- 4.9; P = 0.0019) G-I/R (7.3 +/- 2.0). This effect was not observed in the colon: G-I/R = 10.7 +/- 4.6 versus G-Arg = 15.5 +/- 8.7 (P = .2480). CONCLUSION:Supply of L-arginine increased tissue levels of nitricoxide and reduced morphologic intestinal injury among mice undergoing I/R.

journal_name

Transplant Proc

journal_title

Transplantation proceedings

authors

Cintra AE,Martins JL,Patrício FR,Higa EM,Montero EF

doi

10.1016/j.transproceed.2008.02.044

subject

Has Abstract

pub_date

2008-04-01 00:00:00

pages

830-5

issue

3

eissn

0041-1345

issn

1873-2623

pii

S0041-1345(08)00153-X

journal_volume

40

pub_type

杂志文章

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