Zhou JL, Jin GH, Yi YL, Zhang JL, Huang XL. Role of nitric oxide and peroxynitrite anion in lung injury induced by intestinal ischemia-reperfusion in rats.
World J Gastroenterol 2003;
9:1318-22. [PMID:
12800248 PMCID:
PMC4611808 DOI:
10.3748/wjg.v9.i6.1318]
[Citation(s) in RCA: 36] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
AIM: To evaluate effects of nitric oxide (NO) and peroxynitrite anion (ONOO-) on lung injury following intestinal ischemia-reperfusion (IR) in rats.
METHODS: A rat model of intestinal ischemia was made by clamping superior mesenteric artery and lung injury was resulted from reperfusion. The animals were randomly divided into 3 groups: sham operation (Sham), 2 h ischemia followed by 2 h reperfusion (IR) and IR pretreated with aminoguanidine (AG) - an inhibitor of inducible NO synthase (iNOS) 15 min before reperfusion (IR + AG). The lung malondialdehyde (MDA) and nitrate/nitrite (NO2-/NO3-) contents and morphological changes were examined. Western blot was used to detect the iNOS protein expression. Immunohistochemical staining was used to determine the change of nitrotyrosine (NT)- a specific "footprint" of ONOO-.
RESULTS: The morphology revealed evidence for lung edema, hemorrhage and polymorphonuclear sequestration after intestinal IR. Compared with sham group, lung contents of MDA and NO2-/NO3- in IR group were significantly increased (12.00 ± 2.18 vs 23.44 ± 1.25 and 76.39 ± 6.08 vs 140.40 ± 4.34, P < 0.01) and the positive signals of iNOS and NT were also increased in the lung. Compared with IR group, the contents of MDA and NO2-/NO3- in IR+AG group were significantly decreased (23.44 ± 1.25 vs 14.66 ± 1.66 and 140.40 ± 4.34 vs 80.00 ± 8.56, P < 0.01) and NT staining was also decreased.
CONCLUSION: Intestinal IR increases NO and ONOO- production in the lung, which may be involved in intestinal IR-mediated lung injury.
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