摘要目的 评价盐酸戊乙奎醚对大鼠创伤性急性肺损伤时肿瘤坏死因子α诱导蛋白8样分子2(TIPE2)-Toll样受体4(TLR4)-髓样分化因子88(MyD88)信号通路的影响.方法 SPF级健康雄性SD大鼠30只,8周龄,体重190～210 g,采用随机数字表法分为3组(n＝10):假手术组(Sham组)、创伤性急性肺损伤组(ALI组)和盐酸戊乙奎醚组(PHCD组).Sham组只麻醉不撞击;ALI组和PHCD组制备胸部撞击致大鼠创伤性急性肺损伤模型;PHCD组大鼠于胸部撞击后即刻腹腔注射盐酸戊乙奎醚2 mg∕kg.于模型制备成功后8 h后处死大鼠取肺,光镜下观察肺组织病理学结果,电镜下观察肺组织超微结构,确定肺组织湿干重(W∕D)比值,采用Western blot法检测肺组织TLR4和MyD88表达.结果 与 Sham组比较,ALI组和 PHCD组肺组织 W∕D 比值升高,TIPE2 表达下调,TLR4和MyD88表达上调(P＜0.05);与ALI组比较,PHCD组肺组织W∕D比值降低,TIPE2表达上调,TLR4和MyD88表达下调(P＜0.05).PHCD组肺组织病理学损伤和超微结构损伤较ALI组减轻.结论 盐酸戊乙奎醚减轻大鼠创伤性急性肺损伤的机制与激活TIPE2-TLR4-MyD88信号通路有关.

abstractsObjective To evaluate the effect of penehyelidine hydrochloride(PHCD)on tumor necrosis factor α-induced protein 8-like-2(TIPE2)-Toll-like receptor 4(TLR4)-myeloid differentiation fac-tor 88(MyD88)signaling pathway in a rat model of traumatic acute lung injury(ALI).Methods Thirty SPF healthy male Sprague-Dawley rats,aged 8 weeks,weighing 190-210 g,were divided into 3 groups(n＝15 each)by a random number table method: sham operation group(group Sham),traumatic ALI group(group ALI)and group PHCD.ALI was induced by blunt chest trauma in ALI and PHCD groups.PHCD 2 mg/kg was intraperitoneally injected immediately after blunt chest trauma in group PHCD.The rats were sacrificed and lung tissues were removed at 8 h after the model was successfully established for exami-nation of the pathological changes and ultrastructure of lung tissues(with a light microscope or an electron microscope)and for determination of the wet to dry weight ratio(W/D ratio)and expression of TLR4 and MyD88 in lung tissues.Results Compared with group Sham,the W/D ratio was significantly increased,TIPE2 expression was down-regulated,and the expression of TLR4 and MyD88 was up-regulated in ALI and PHCD groups(P＜0.05).Compared with group ALI,the W/D ratio was significantly decreased,TIPE2 expression was up-regulated,and the expression of TLR4 and MyD88 was down-regulated(P＜0.05),and the pathological changes of lung tissues and ultrastructure were significantly attenuated in group PHCD.Conclusion The mechanism by which PHCD reduces traumatic AIL is related to activating TIPE2-TLR4-MyD88 signaling pathway in rats.