[摘要] 目的:探讨中药升清胶囊在分子层面防治胆石病的机制。方法:雌性豚鼠60只,随机分成正常组(喂正常饮食作为对照)、模型组(喂低蛋白饮食致石)和中药组(喂低蛋白饮食致石加中药升清胶囊治疗)。6周后处死并取材,观察动物成石情况,检测肝组织胆红素尿苷二磷酸葡萄糖醛酸基转移酶(bilirubin UDPglucuronosyltransferase, BUGT)mRNA及胆固醇7α羟化酶(cholesterol 7αhydroxylase, CYP7A1)mRNA表达。结果:各组豚鼠成石比例分别为正常组2/14、模型组为9/11、中药组为4/14,组间有显著差异(P<0.05),正常组和中药组豚鼠的肝组织BUGT mRNA及CYP7A1 mRNA表达明显高于模型组(P<0.05)。结论:中药升清胶囊可能是通过上调肝组织中BUGT mRNA和CYP7A1 mRNA的表达,干预胆红素和胆固醇代谢,抑制致石性胆汁形成,起到预防胆结石的作用。
[关键词] 胆结石; 升清胶囊; BUGT; 胆固醇7α羟化酶; 基因
Effects of Shengqing Capsules on cholelithiasisrelated genes in guinea pigs
ABSTRACT Objective: To explore the molecular mechanisms of Shengqing Capsules in treating cholelithiasis. Methods: Sixty female guinea pigs were randomized into 3 groups: group Ⅰ (fed with normal diet), group Ⅱ (fed with lowprotein diet) and group Ⅲ (fed with lowprotein diet and Shengqing Capsules). After sixweek feeding, the gallstone formation and the expressions of bilirubin UDPglucuronosyltransferase (BUGT) mRNA and cholesterol 7αhydroxylase (CYP7A1) mRNA were observed. Results: The proportions of stoneformed in groups Ⅰ, Ⅱ and Ⅲ were 2/14, 9/12 and 4/14, respectively. There were significant differences among the three groups (P<0.05). The expressions of BUGT and CYP7A1 mRNAs were higher in both group Ⅰ and group Ⅲ as compared with those in the group Ⅱ (P<0.05). Conclusion: Shengqing Capsules can reduce the rate of stoneformation, which may be due to its interference of metabolism of bilirubin and cholesterol and upregulation of the expressions of BUGT and CYP7A1 mRNAs.
KEY WORDS cholelithiasis; Shengqing Capsules; BUGT; cholesterol 7αhdroxylase; gene
胆石病属中医“胁痛”、“黄疸”等范畴,历代医家积累了丰富的治疗经验。作者曾在已故外科专家顾伯华教授和徐长生教授采用疏肝利胆法治疗本病取得较好疗效的经验基础上,总结和开发了治疗肝胆气郁型胆石病的中成药胆宁片。近年,作者又从小复方角度进一步精简胆宁片的药味,研制开发出治疗胆石病的新一代中成药升清胶囊,并在此前的研究中发现该药能从胆石病发病的枢纽环节肝细胞水平阻断致石性病理性胆汁的形成,显著降低实验动物胆色素结石的成石率[1]。为进一步探讨升清胶囊在分子层面防治胆石病的机制,开展了以下研究。
1 材料与方法
1.1 实验材料
1.1.1 实验动物 红目雌性豚鼠,清洁级,共60只,体质量250~300 g,由上海中医药大学实验动物中心提供。
1.1.2 药物 升清胶囊,主要药物组成为大黄、虎杖和陈皮,上海中医药大学龙华医院制剂室提供干粉剂。
1.1.3 饲料 正常饲料,由上海申旺实验动物中心提供。造模用致石性饲料,在正常饲料基础上添加致石药物。具体配方为:正常饲料45.43 g,致石性药物4.57 g(其中酪蛋白1 g、蔗糖1.5 g、猪油1 g、微晶纤维素1 g、胆酸0.02 g、胆固醇0.05 g)。
1.1.4 主要试剂 焦碳酸二乙酯(DEPC),脱氧核苷三磷酸(10 mmol/L),随机引物(100 μmol/L),博彩生物技术公司产品;RNA提取试剂Trizol,Taq聚合酶(5 U/μl),Gibco公司产品;MMuLV逆转录酶(200 U/μl),核糖核酸酶抑制剂(RNAsin,40 U/μl),Promaga公司产品;DNA标记物(100 bp),生工生物技术公司产品。豚鼠胆红素尿苷二磷酸葡萄糖醛酸基转移酶(bilirubin UDPglucuronosyltransferase, BUGT)上游引物(270289, 20 bp): 5’ACT GGG CAA CGC TAA GAA GG3’;下游引物(531512, 20 bp): 5’TAT GCC ACA GGG AAC AGA GC3’;PCR产物长度:262 bp。豚鼠胆固醇7α羟化酶(cholesterol 7αhydroxylase, CYP7A1)上游引物(812832, 21 bp): 5’GTT TCT CAA TGA CAC GCT CTC3’;下游引物(12491229 1 2 3 4 下一页
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