[Role of p38 mitogen activated protein kinase signaling pathway in lung ischemia-reperfusion protection offered by HOE642]

Abstract

To explore the protective effect of sodium channels antagonists HOE642 on lung ischemia reperfusion and the role of the p38 mitogen activated protein kinase (p38MAPK) signaling pathway in this process. Methods: A total of 36 mice were randomly divided into a sham operation group (SHAM group), a lung ischemia reperfusion group (I/R group) and a lung ischemia reperfusion+HOE642 group (HOE group). The water content was detected by electronic scales, and the lung tissue pathological changes were observed under optical microscope. The inflammatory cytokines including IL-6 and TNF-α were examined by ELISA. The intracellular calcium fluorescence intensity was examined and observed under fluorescence microscope, and the protein expression of p38MAPK was detected by Western blot. Results: Lung water content in the HOE group was lower than that in the I/R group, but higher than that in the SHAM group (both P<0.05). Lung interstitial edema, hemorrhage, lung tissue inflammatory cells infiltration were significantly alleviated in the HOE group than those in the I/R group, while the injury in the HOE group was aggravated than those in the SHAM group (both P<0.05). The IL-6 and TNF-α in lung tissues in the HOE group were lower than those in the I/R group, but higher than those in the SHAM group (both P<0.05). Intracellular calcium fluorescence intensity in the HOE group was lower than that in the I/R group, but higher than that in the SHAM group (both P<0.05). The protein expression of p38MAPK in lung tissues in the HOE group was lower than that in the I/R group, but higher than that in the SHAM group (both P<0.05). Conclusion: HOE642 may exert protective effect on pulmonary I/R injury through regulation of the p38MAPK signaling pathway, resulting in reduction of intracellular calcium ion concentration and calcium overload, and decrease of inflammatory response.