AIM:To explore the role of aloperine in ischemia-reperfusion(I/R)-induced H9c2 cardiomyocyte injury and inflammation.METHODS: The H9c2 cardiomyocytes were cultured under hypoxia and re-oxygenation condi-tions to simulate ischemia-reperfusion(SI/R)injury.After treatment with aloperine at various doses,the cell viability was measured by MTT assay.The cell apoptosis was analyzed by flow cytometry.Simultaneously,the levels of lactate dehydro-genase(LDH),malonaldehyde(MDA)and caspase-3 activity were detected by the commercial kits.The levels of inflam-matory cytokines were also detected by ELISA.Moreover,the effects of aloperine on the activation of PI 3K/AKT signaling pathway were determined by Western blot.RESULTS:Pre-treatment with aloperine remarkably abated the inhibitory effect of SI/R on H9c2 cell viability,and decreased the elevations of LDH and MDA triggered by SI /R(P<0.05).Pre-treat-ment with aloperine dramatically suppressed the cell apoptosis induced by SI /R treatment(P<0.05), concomitant with the decrease in caspase-3 activity and increase in Bcl-2/Bax ratio(P<0.05).In contrast to SI/R group,aloperine treat-ment notably restrained the concentrations of pro-inflammatory cytokines, including interleukin-6, tumor necrosis factor-α and interleukin-1β(P<0.05).Furthermore, aloperine remarkably increased the protein levels of p-PI3K and p-AKT. While blocking the PI3K/AKT pathway with its specific inhibitor LY294002, the viability-promoting, anti-apoptotic and anti-inflammatory effects of aloperine on the H 9c2 cells were obviously attenuated(P<0.05).CONCLUSION: Alope-rine protects against cardiomyocytes from I/R injury and inhibits inflammatory responses by activating the PI 3K/AKT signa-ling pathway,implying a potential benefic role of aloperine against myocardial I /R injury.%目的:明确苦豆碱对缺血再灌注(I/R)引起的大鼠心肌H9c2细胞损伤和炎症应答的作用及其机制.方法:采用缺氧/复氧的方法体外模拟缺血再灌注(SI/R)心肌损伤,用不同浓度苦豆碱处理,MTT实验分析苦豆碱对H9c2细胞存活率的影响;流式细胞术检测细胞凋亡;试剂盒检测乳酸脱氢酶(LDH)和丙二醛(MDA)的水平及caspase-3的活性;ELISA分析多种炎性因子水平;同时用Western blot法分析苦豆碱对PI3K/AKT信号通路的影响.结果:苦豆碱可对抗SI/R抑制的H9c2细胞存活率,同时明显降低SI/R引起的LDH及MDA浓度的增加(P<0.05).此外,苦豆碱能够显著抑制SI/R触发的细胞凋亡(P<0.05),同时降低SI/R处理后引起的caspase-3活性的增加,并上调Bcl-2/Bax比值(P<0.05).与SI/R组相比,苦豆碱处理可显著性降低H9c2心肌细胞炎性因子白细胞介素6、肿瘤坏死因子α和白细胞介素1β的浓度(P<0.05).此外,与SI/R组相比,苦豆碱处理后可显著增加p-PI3K和p-AKT的蛋白水平(P<0.05);当用LY294002抑制PI3K/AKT通路后,苦豆碱促心肌细胞存活、抗凋亡及抗炎症的作用明显减弱(P<0.05).结论:苦豆碱可通过激活PI3K/AKT信号通路对抗心肌细胞缺血再灌注引起的损伤及炎症应答,提示其对心肌缺血再灌注损伤的防治具有潜在应用价值.
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