摘要目的 探讨姜黄素对脓毒症小鼠急性肺损伤的保护作用及机制.方法 取120只清洁级BALB/c雄性小鼠随机(随机数字法)分成8组,即假手术组、脓毒症组、姜黄素对照组、姜黄素干预组、阴性病毒-脓毒症组、阴性病毒-姜黄素干预组、线粒体融合蛋白(Mfn2)干扰-脓毒症组、Mfn2干扰-姜黄素干预组,每组15只.脓毒症组及姜黄素干预组通过盲肠结扎穿孔术(cecal ligation and puncture,CLP)造模,姜黄素干预组及姜黄素对照组予姜黄素200mg/(kg·d)灌胃1周,阴性病毒-脓毒症组及阴性病毒-姜黄素干预组通过尾静脉注射阴性腺相关病毒来建立,Mfn2干扰-脓毒症组及Mfn2干扰-姜黄素干预组通过尾静脉注射携带Mfn2干扰序列的腺相关病毒建立模型,各组均于24 h后处死小鼠.通过肺湿干比和病理学检查反映肺损伤程度,ELISA法检测肺泡灌洗液的炎症因子TNF-α和IL-6,Westem blot检测细胞凋亡的关键分子caspase-3的活化,并通过TUNEL检测细胞凋亡.采用SPSS 22.0软件进行统计分析,计数资料比较采用x2检验,计量资料组间比较采用单因素方差分析.结果 与假手术组比较,脓毒症组小鼠肺组织湿干重比显著增加(71.11±3.78 vs 31.11±5.61,P=0.002);与假手术组相比,脓毒症组织病理评分明显增加(P=0.006),炎症因子TNF-α(P=0.00l)和IL-6 (P=0.012)显著增高,肺组织细胞凋亡及凋亡相关蛋白caspase-3 cleaved表达同样明显增加(P=0.001).与脓毒症组比较,姜黄素干预组小鼠肺组织湿干重比明显降低(32.84±6.15 vs 71.11±3.78,P=0.004),组织病理评分显著降低(P=0.004),炎症因子TNF-α (P=0.013)和IL-6 (P=0.003)均明显降低,肺组织细胞凋亡及凋亡相关蛋白caspase-3 cleaved表达同样显著减少(P=0.012).在下调Mfn2后,Mfn2干扰-姜黄素干预组与Mfn2干扰-脓毒症组相比,小鼠肺组织干湿重比无明显降低,组织病理评分也无显著降低,炎症因子TNF-α和IL-6均无明显降低,肺组织细胞凋亡及凋亡相关蛋白caspase-3 cleaved表达无显著减少.结论 姜黄素可能通过上调线粒体融合蛋白2的表达减轻脓毒症急性肺损伤.

abstractsObjective To investigate the protective effect and mechanism of curcumin on acute lung injury in septic mice.Methods Totally 120 clean BALB/c male mice were randomly (random number) divided into 8 groups:sham group,sepsis group,curcumin control group,curcumin intervention group,negative virus-sepsis group,negative virus-curcumin intervention group,Mfn2 interference-sepsis group,and Mfn2 interference-curcumin intervention group,15 rats in each group.Mice in the sepsis and the curcumin groups were given the cecal ligation and puncture (CLP) mice in the curcumin intervention and curcumin control groups were given curcumin 200 mg/(kg·d) for 1 week,and mice in the negative virus-sepsis group and negative virus-curcumin intervention groups were established by injection of a negative adeno-associated virus in the tail vein.The Mfn2 interference-sepsis and Mfn2 interference-curcumin intervention groups were established by injecting an adeno-associated virus carrying the Mfn2 interference sequence through the tail vein.Mice were sacrificed after 24 h in each group.The degree of lung injury was examined by lung wet-to-dry weight ratio and pathological examination.The inflammatory factors of alveolar lavage fluid including TNF-α and IL-6 were detected by ELISA,the activation of caspase-3,a key molecule for apoptosis,was detected by Western blot,and apoptosis was detected by TUNEL.The data were analyzed by SPSS 22.0 software,the count data was analyzed by x2 test,and the comparison of measurement data between groups was analyzed by one-way ANOVA.Results Compared with the sham group,the wet-to-dry weight ratio of lung tissue in the sepsis group was significantly increased (71.11 ± 3.78 vs 31.11 ± 5.61,P=0.002),the histopathological score was significantly higher (P=0.006),the inflammatory factors TNF-α (P=0.001) and IL-6 (P=0.012) were dramatically increased,and the apoptosis of lung tissue and the expression of caspase-3 cleaved were also significantly increased (P=0.001).Compared with the sepsis group,the wet-to-dry weight ratio and the histopathological score of lung tissue in the curcumin-treated group was significantly lower (32.84 ± 6.15 vs 71.11 ± 3.78,P=0.004),and the inflammatory factors TNF-α(P=0.013) and IL-6 (P=0.003) were obviously decreased,and apoptosis and apoptosis-related protein caspase-3 cleaved expression were also dramatically decreased (P=0.012).After Mfn2 was down-regulated,Mfn2 interference-curcumin intervention group interfered with Mfn2.Compared with the sepsis group,the dry-to-wet weight ratio and the histopathological score of the lung tissue of the mice was not significantly decreased.Further studies found that after down-regulating Mfn2,compared with the Mfn2 interfere-sepsis group,Mfn2 interfere-curcumin intervention group had no such performance.The inflammatory factors TNF-α and IL-6 were not significantly decreased,and the apoptosis of lung tissue and the expression of apoptosis-related protein caspase-3 cleaved were not significantly reduced.Conclusion Curcumin may attenuate acute lung injury in sepsis by up-regulating the expression of Mfn2.