基于内质网应激PERK/eIF2α/ATF4/CHOP通路探讨枳葛口服液含药血清对乙醇诱导BRL-3A损伤的保护作用及机制研究

Exploring the Protective Effect and Mechanism of Serum Containing Zhige Oral Solution Ameliorate Ethanol-Induced BRL-3A Damage Based on Endoplasmic Reticulum Stress PERK/eIF2α/ATF4/CHOP Pathway

目的基于内质网应激(Endoplasmic reticulum stress,ERS)信号通路PERK/eIF2α/ATF4/CHOP探讨枳葛口服液含药血清对BRL-3A大鼠肝细胞损伤的保护作用及机制。方法(1)制备含药血清:SD雄性大鼠随机分为3组:枳葛口服液组、美他多辛组、正常组,分别予以枳葛口服液、美他多辛及生理盐水灌胃,连续干预5天,腹主动脉取血制备含药血清。(2)培养正常BRL-3A大鼠肝细胞,用不同浓度乙醇(1.0%、1.5%、2.0%、2.5%、3.0%、5.0%、7.0%、10.0%)干预细胞24 h后用CCK-8法测定各组细胞存活率。(3)BRL-3A大鼠肝细胞分为正常组,模型组,美他多辛组,枳葛口服液低、中、高剂量组(后简称为低剂量组、中剂量组、高剂量组)。24 h后测定各组细胞上清液中γ-谷氨酰转肽酶(GGT)、乳酸脱氢酶(LDH)水平,CCK-8检测BRL-3A细胞存活率,Real-time PCR及Western blot检测各组细胞内PERK/eIF2α/ATF4/CHOP通路相关mRNA及蛋白表达水平。结果(1)不同浓度乙醇(1.0%、1.5%、2.0%、2.5%、3.0%、5.0%、7.0%、10.0%)干预细胞24 h后,细胞存活率随着乙醇浓度的升高呈逐渐下降趋势,当乙醇浓度为5%时,细胞存活率明显下降(P<0.05),故选择乙醇浓度为1.0%、1.5%、2.0%、2.5.0%、3.0%、5.0%进行后续实验。(2)与正常组相比,模型组上清液中GGT、LDH含量显著升高(P<0.05),PERK/eIF2α/ATF4/CHOP通路相关因子mRNA和蛋白的表达显著升高(P<0.05),呈现明显肝损伤状态。(3)与模型组相比,枳葛口服液组及美他多辛组以上指标均呈现不同程度的降低,其中枳葛口服高剂量组效果最显著(P<0.05)。结论枳葛口服液含药血清能够改善乙醇诱导的BRL-3A大鼠肝细胞损伤,其机制可能与抑制内质网应激PERK/eIF2α/ATF4/CHOP信号通路有关。

Objective To explore the protective effect and mechanism of endoplasmic reticulum stress(ERS)signaling pathway PERK/eIF2α/ATF4/CHOP on BRL-3A cell injury by serum containing Zhige oral solution.Methods①Preparation of drugcontaining serum:SD male rats were randomly divided into 3 groups:Zhige oral solution group,Metadoxine group and normal group,and were gavaged with Zhige oral solution,Metadoxine and saline respectively,and the drug-containing serum was prepared by blood sampling from the abdominal aorta for 5 consecutive days of intervention.②Normal BRL-3A cells were cultured,and the cell survival rate of each group was determined by CCK-8 after 24h of cell intervention with different concentrations of ethanol(1.0%,1.5%,2.0%,2.5%,3.0%,5.0%,7.0%,10.0%).③Cultured normal BRL-3A cells were divided into normal group,model group,metadoxine group,and Zhige oral solution low,medium and high dose group(later referred to as low dose group,medium dose group and high dose group),After 24 h,the levels ofγ-glutamyl transpeptidase(GGT)and lactate dehydrogenase(LDH)in the supernatant of each group were measured,and the survival rate of BRL-3A cells was measured by CCK-8.The expression levels of PERK/eIF2α/ATF4/CHOP pathway-related mRNA and protein in each group were measured by Real-time PCR and Western blot.Results①After 24 h of cell intervention with the same concentration of ethanol(1.0%,1.5%,2.0%,2.5%,3.0%,5.0%,7.0%,10.0%),the cell survival rate gradually decreased with the increase of ethanol concentration,and when the ethanol concentration was 5%,the cell survival rate decreased significantly(P<0.05),so the ethanol concentrations of 1.0%,1.5%,2.0%,2.5%,3.0%,5.0%were chosen for the subsequent experiments.②Compared with the normal group,the GGT and LDH contents in the supernatant of the model group were significantly higher(P<0.05),and the expression of PERK/eIF2α/ATF4/CHOP pathway-related factors mRNA and protein were significantly higher(P<0.05),showing a significant state of liver injury.③Compared with the model group,the Zhige oral solution group and the metadoxine group showed different degrees of reduction in the above indexes,with the most significant effect in the Zhige oral solution high-dose group(P<0.05).Conclusion Serum containing Zhige oral solution ameliorated ethanol-induced hepatocyte injury in BRL-3A rats,and the mechanism may be related to the inhibition of endoplasmic reticulum stress PERK/eIF2α/ATF4/CHOP signaling pathway.