Role of interleukin-18 in the development of acute pulmonary injury induced by intestinal ischemia/reperfusion and its possible mechanism.

Abstract:

BACKGROUND AND AIMS:Lung injury is an important target for the systemic inflammatory response associated with intestinal ischemia/reperfusion (I/R). In the present study, the role of interleukin (IL)-18 in the development of acute pulmonary injury induced by intestinal I/R and its possible mechanism in relation to the increased activity of inducible nitric oxide synthase and tumor necrosis factor (TNF)-alpha were investigated. METHODS:Mice were randomly divided into three groups: normal control group without operation; sham group with sham operation; and I/R group in which mice underwent superior mesenteric artery occlusion for 30 min followed by reperfusion for 3 h. Each group received pretreatment with exogenous IL-18, anti-IL-18 neutralizing antibody or L-NIL, the selective inhibitor of inducible nitric oxide synthase, 30 min before ischemia. The expression of TNF-alpha was detected by reverse transcription-polymerase chain reaction (RT-PCR) and enzyme-linked immunosorbent assay (ELISA). Lung injury was evaluated by means of Evans blue dye (EBD) concentration, myeloperoxidase (MPO) activity and morphological analysis. RESULTS:The experimental results showed that both in the sham-operated and I/R groups of animals, pretreatment with exogenous IL-18 clearly enhanced pulmonary MPO activity, microvascular leakage and the expression of TNF-alpha mRNA and protein. In contrast, IL-18 did not increase the TNF-alpha level and degree of lung injury, although it clearly enhanced the pulmonary MPO activity in normal animals. Meanwhile, IL-18 antibody given prior to ischemia led to a reduction in the sequestration of neutrophils, extravasation of EBD and downregulation of the serum level of TNF-alpha in the I/R group of animals. In addition, selective inhibition of inducible nitric oxide synthase (iNOS) that inhibited plasma extravasation and pulmonary injury without affecting the MPO activity could be demonstrated in all treated animals. CONCLUSIONS:These data suggested a role of IL-18 in the activation and sequestration of neutrophils in lungs. Our results were consistent with the hypothesis that increased sequestration of neutrophils and microvascular leakage might, respectively, relate to the increased IL-18 level and the elevation of TNF-alpha/iNOS activity, and these two aspects might synergically contribute to intestinal I/R-induced pulmonary dysfunction.

authors

Yang YJ,Chen SH,Ge XR

doi

10.1111/j.1440-1746.2006.04612.x

subject

Has Abstract

pub_date

2007-02-01 00:00:00

pages

253-60

issue

2

eissn

0815-9319

issn

1440-1746

pii

JGH4612

journal_volume

22

pub_type

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