探讨醒脑灌肠液对心肺复苏后大鼠脑损伤及IL-33/ST2信号通路的影响

目的:研究醒脑灌肠液对心肺复苏后大鼠脑损伤及IL-33/ST2信号通路的影响,以探讨醒脑灌肠液对心肺复苏后大鼠的脑保护作用及机制.方法:SD大鼠随机分为假手术组、模型组、醒脑灌肠液低剂量(5 mL/kg)组、醒脑灌肠液中剂量(10 mL/kg)组、醒脑灌肠液高剂量(20 mL/kg)组和乌司他丁组,每组12只,除假手术...

Effect of Xingnao enema fluid on brain injury and IL-33/ST2 signaling pathway in rats after cardiopulmonary resuscitation

AIM: To study the effects of Xingnao enema fluid on brain injury and IL-33/ST2 signaling pathway in rats after cardiopulmonary resuscitation, and to explore the brain protective effect and mechanism of Xingnao enema fluid. METHODS: SD rats were randomly divided into sham operation group, model group, low-dose(5 mL/kg), middle-dose(10 mL/kg) and high-dose(20 mL/kg) Xingnao enema liquid groups, and ulinastatin group, with 12 rats in each group. Except for the rats in sham operation group, the rats in other groups were used to establish the model of cardiopulmonary resuscitation and were treated with Xingnao enema fluid and ulinastatin. Seven days later, all rats were scored for neurological deficit. The rats were sacrificed, and the water content of brain tissues was calculated. Hematoxylin-eosin(HE) staining was used to detect the pathological changes of brain tissues of the rats in each group. The levels of super-oxide dismutase(SOD) and malondialdehyde(MDA) were detected in the brain tissue. The levels of S100 calcium bin-ding protein beta subunit(S100β) and neuron-specific enolase(NSE) in serum, and interleukin(IL)-1β and tumor necrosis factor(TNF)-α in brain tissue were measured by ELISA. The expression of interleukin-33(IL-33) and growth stimulation expressed gene 2(ST2) in brain tissue was determined by Western blot. RESULTS: Compared with sham operation group, the brain tissue of model group showed tissue disorder, focal hemorrhage, neuronal nucleus contraction, apoptosis and other pathological changes, and the neurological deficit score was increased. The water content of brain tissue, the le-vels of S100β, NSE, MDA, IL-1β, TNF-α, IL-33 and ST2 were significantly increased, and the level of SOD decreased significantly(P<0.05). Compared with model group, the pathological damage of brain tissue in low-, middle-and high-dose Xingnao encma fluid groups and ulinastatin group was reduced, and the neurological deficit score was decreased. The water content of brain tissue, levels of S100β, NSE, MDA, IL-1β, TNF-α, IL-33 and ST2 were significantly decreased, and the level of SOD was increased significantly(P<0.05). There was a dose-dependent relationship in different doses of Xingnao enema fluid groups, and no significant difference between high-dose Xingnao enema fluid group and ulinastatin group was observed(P>0.05). CONCLUSION: Xingnao enema fluid repairs brain injury in rats after cardiopulmonary resuscitation, and down-regulation of IL-33/ST2 signaling pathway may be its mechanism.