Administration of SB239063, a potent p38 MAPK inhibitor, alleviates acute lung injury induced by intestinal ischemia reperfusion in rats associated with AQP4 downregulation.

Abstract:

:Acute lung injury (ALI), induced by intestinal ischemia reperfusion (II/R) injury, is characterized by pulmonary edema and inflammation. Aquaporin 4 (AQP4), has been pointed out recently involving in edema development. Previous studies have shown that p38 mitogen activated protein kinase (MAPK) activation resulted in lung inflammation, while p38 MAPK inhibitor can alleviate the pathology injury of lung tissue. However, the regulated mechanism of p38 MAPK in ALI induced by II/R is unclear. In this study, we established II/R rats' model by clamping the superior mesenteric artery (SMA) and coeliac artery (CA) for 40min and subsequent reperfusion for 16h, 24h, 48h. Subsequently, SB239063, a specific inhibitor of the activity of p38 MAPK, was injected (10mg/kg) intraperitoneally 60min before the operation. The severity of ALI was determined by histology analysis (HE staining and ALI scoring) and lung edema (lung wet/dry weight ratio) assessment. Western blot (WB) was applied to detect the expression level of AQP4 and phosphorylated (P)-p38 MAPK, and the localization of AQP4 was detected by immunofluorescent staining (IF). We found that AQP4 could express in the lung tissue. II/R could significantly induce lung injury, confirmed by lung injury scores and lung wet/dry weight ratios. The level of P-p38 MAPK and AQP4 were largely up-regulated in lung tissues. Moreover, inhibition of p38 MAPK activity could effectively down-regulate AQP4 expression and diminish the severity of II/R-induced ALI. These novel findings suggest that inhibition of p38 MAPK function should be a potential strategy for the prevention or treatment of ALI, by targeting AQP4 in future clinic trial.

journal_name

Int Immunopharmacol

authors

Xiong LL,Tan Y,Ma HY,Dai P,Qin YX,Yang RA,Xu YY,Deng Z,Zhao W,Xia QJ,Wang TH,Zhang YH

doi

10.1016/j.intimp.2016.03.036

subject

Has Abstract

pub_date

2016-09-01 00:00:00

pages

54-60

eissn

1567-5769

issn

1878-1705

pii

S1567-5769(16)30127-8

journal_volume

38

pub_type

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