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p38 MAPK Regulates Ischemia-Reperfusion-Induced Recruitment of Leukocytes in the Colon

p38 MAPK Regulates Ischemia-Reperfusion-Induced Recruitment of Leukocytes in the Colon

Stefan Santén, Andrada Mihaescu, Matthias W Laschke, Michael D Menger, Yousheng Wang, Bengt Jeppsson, Henrik Thorlacius

Surgery. 2009 Mar;145(3):303-12.

PMID: 19231583

Abstract:

Background:
Our objective was to examine the role of p38 mitogen-activated protein kinase (MAPK) in ischemia-reperfusion (I/R)-induced recruitment or leukocytes in the colon.
Methods:
C57/Bl6 mice were subjected to 30 minutes of ischemia by clamping the superior mesenteric artery followed by 2 hours of reperfusion. Animals were pretreated with the selective p38 MAPK inhibitors SB 239063 and SKF 86002 before induction of I/R. Leukocyte-endothelium interactions were quantified by use of intravital fluorescence microscopy. Additionally, the role of p38 MAPK in mast cell-generated tumor necrosis factor-alpha (TNF-alpha) as well as neutrophil adhesion and P-selectin expression were examined in vitro.
Results:
SB 239063 and SKF 86002 decreased both I/R-provoked leukocyte rolling and adhesion by > 75%. Inhibition of p38 MAPK decreased dose-dependently the mast cell generated TNF-alpha production as well as TNF-alpha-induced expression of P-selectin and neutrophil adhesion on endothelial cells.
Conclusion:
We conclude that p38 MAPK regulates leukocyte rolling and adhesion in colonic I/R. Moreover, inhibition of p38 MAPK activity decreases formation of TNF-alpha and P-selectin-dependent leukocyte attachment to activated endothelial cells. Thus, our findings suggest that interference with the p38 MAPK signaling pathway could be an effective strategy to protect against I/R-induced inflammation in the colon.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP72873746-A	SKF-86002		72873-74-6	Price

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