高效快速降脂动物模型研究

探讨斑马鱼作为降脂药物筛选模型的可行性以及盐酸小檗碱(BBR)对高脂斑马鱼的影响。用含4%胆固醇饲料喂养3月龄斑马鱼0,2,4,8,14,20,25,30 d,检测血清总胆固醇含量的变化;测定对照组、高胆固醇组、0.01%辛伐他汀组、0.1%BBR组和0.2%BBR组斑马鱼血清总胆固醇(TC)、总甘油三酯(TG)、低密度脂蛋白胆固醇(LDL-c)和高密度脂蛋白胆固醇(HDL-c)的水平;RT-PCR检测肝脏HMGCR,LDLR和CYP7A1a mRNA的表达水平;油红O染色检测肝脏中脂肪含量的变化。结果显示4%胆固醇喂养斑马鱼后血清TC水平升高且有时间依赖性,20 d基本达到稳定水平;BBR组斑马鱼血清TC,TG和LDL-c水平显著下降,肝脏HMGCR mRNA的表达下降,LDLR和CYP7A1a mRNA的表达升高,脂肪含量减少。4%胆固醇饲料喂养斑马鱼20 d即可建立高脂斑马鱼模型,研究结果为进一步开展降脂药物的筛选奠定基础。

Efficient and rapid liquid reduction animal model

To investigate the practicability of establishing zebrafish lipid-lowering drug screening model and the effect of berberine (BBR) on hyperlipidemic zebrafish. Three-month-old zebrafishes were fed with 4% cholesterol for 0, 2, 4, 8, 14, 20, 25, 30 days, and the level of total cholesterol in serum was measured. Zebrafish were randomly divided into four groups:the control group, the high cholesterol diet group, the 0.01% simvastatin-treated group, the 0.1% berberine-treated group and the 0.2% berberine-treated group. The levels of total cholesterol (TC), triglyceride (TG), low density lipoprotein cholesterol (LDL-c) and high-density lipoprotein cholesterol (HDL-c) in serum were measured; the expression of hepatic HMGCR, LDLR and CYP7A1a mRNA expressions were detected by real time PCR. Oil red O staining was performed to observe the changes in fat content in the liver. According to the result, the level of serum TC in the 4% cholesterol diet group significantly was higher than that of the normal control group in a time-dependent manner and reached a stable level at the 20th day. The BBR group showed significant decreases in the levels of TC, TG and LDL-c, HMGCR mRNA expression and fat content and increases in LDLR and CYP7A1a mRNA. The hyperlipidemia zebrafish model was successfully established by feeding with 4% cholesterol for 20 days. The findings lay a foundation for further screenings on lipid-lowering drugs.