摘要
目的 探讨加味四君子汤(党参、茯苓、白术、炙甘草、黄芪、阿胶、茜草)通过影响 5-羟色胺(5-HT)及其受体(5-HT2aR、5-HT2bR)对斑马鱼肠道出血模型的止血作用及其机制.方法 以受精后4 d的斑马鱼为研究对象,6 μmol/L辛伐他汀诱导24 h建立肠道出血模型.将斑马鱼利用随机数字表法分为正常组,模型组,加味四君子汤低、中、高质量浓度组(55.6、167、500 mg/L),造模后,给予相应质量浓度加味四君子汤,24 h后收样.观察血小板计数(PLT)及出血情况,比色法检测5-HT含量及Caspase 3/7 活性,实时PCR法检测 5-HT2aR、5-HT2bR、5-HT转运蛋白(SERT)基因表达,蛋白质印迹法检测蛋白激酶B(AKT)、磷酸化AKT(p-AKT)、细胞外调解蛋白激酶(ERK)、磷酸化ERK(p-ERK)蛋白表达.结果 模型组肠道出血发生率为 70.0%,加味四君子汤低、中、高质量浓度组出血发生率为36.7%、40.0%、80.0%,肠道止血作用分别为 54%、52%、7%.与模型组比较,加味四君子汤低、中质量浓度组 PLT 减少;各质量浓度组 5-HT 含量升高、5-HT2aR 及5-HT2bR基因表达上调,低、中质量浓度组SERT基因表达上调;中、高质量浓度组Caspase 3/7 活性降低;低、中质量浓度组p-AKT、p-ERK蛋白表达上调(均P<0.05).结论 加味四君子汤可减少斑马鱼肠道出血模型的出血发生率及出血程度,其机制可能是通过 5-HT及其受体激活AKT和ERK信号通路实现的.
Abstract
Objective We aimed to investigate the hemostatic effect and mechanism of modified Sijunzi Decoction(MSJZT),consisting of tangshen,India bread,largehead atractylodes rhizome,liquorice root,milkvetch root,ass hide glue,and India madder root,on the zebrafish intestinal bleeding model through 5-hydroxytryptamine(5-HT)and its receptors(5-HT2aR,5-HT2bR).Methods Zebrafish at 4 days post fertilization were used as the research object.An intestinal bleeding model was established by induction with 6 μmol/L simvastatin for 24 hours.The zebrafish were divided into normal group,model group,MSJZT low-,mid-and high-concentration groups(55.6,167,500 mg/L),and after modeling,the corresponding concentration of MSJZT was administered.The samples were collected after 24 hours.Platelet count(PLT)and bleeding status were observed.The content of 5-HT and Caspase 3/7 activity were detected by colorimetry.The gene expressions of 5-HT2aR,5-HT2bR and serotonin transporter(SERT)were detected by real-time PCR.The protein expressions of protein kinase B(AKT),phosphorylated AKT(p-AKT),extracellular signal-regulated protein kinase(ERK),and phosphorylated ERK(p-ERK)were detected by Western blotting.Results The intestinal bleeding rate in the model group was 70.0%,and that in the MSJZT low-,mid-and high-concentration groups was 36.7%,40.0%,and 80.0%,respectively;the intestinal hemostatic effect was 54%,52%,and 7%,respectively.Compared with the model group,the PLT in the MSJZT low-and mid-concentration groups decreased;the content of 5-HT in all MSJZT groups increased,and the gene expressions of 5-HT2aR and 5-HT2bR were up-regulated.The gene expression of SERT was up-regulated in the low-and mid-concentration groups;the Caspase 3/7 activity in the mid-and high-concentration groups was reduced;the expressions of p-AKT and p-ERK proteins were up-regulated in the low-and mid-concentration groups(all P<0.05).Conclusion MSJZT can reduce the incidence and severity of intestinal bleeding in zebrafish intestinal bleeding models.The mechanism may be achieved by activating AKT and ERK signaling pathways through 5-HT and its receptors.
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