脂肪乳剂模拟“饮食不节”致大鼠高尿酸血症模型

Rats hyperuricemia model established by lipid emulsion simulating irregular of diet

目的:由于"饮食不节、过食膏粱厚味"与高尿酸血症密切相关,采用含高胆固醇的脂肪乳剂的因素诱导,观察对大鼠血清尿酸的影响,并与高嘌呤饲料造模比较,以期得到更加稳定、持续的动物模型,为中药药效评价奠定基础。方法:SD雄性大鼠分为正常对照组、高嘌呤饲料(HPD)组、脂肪乳剂(LE)组。HPD组给予高嘌呤饲料喂养,正常饮水;LE组灌胃给予脂肪乳剂10 m L·kg-1体重,正常水食,连续6周。观察大鼠行为学、摄食量和体重;每隔2周,检测血清UA,Cr,BUN,ALT,AST,HDL-c,LDL-c,TG,TC;造模4周,测血清XOD和ADA含量,收集24 h尿液测大鼠尿UA,Cr含量,计算尿酸清除率/肌酐清除率(Cua/Ccr);停止造模后第2,4周测血清UA。结果:造模2周,LE组大鼠摄食量减少、体重降低,血清UA,CR,BUN,ALT,AST,HDL-c,LDL-c,TC均升高,TG水平显著降低;造模4周,HPD组血清UA无明显变化,血清XOD含量显著升高,ADA含量无明显变化;LE组大鼠血清UA仍明显升高,血清XOD,ADA含量显著升高,Cua/Ccr显著降低;造模6周,HPD组血清UA明显升高;LE组血清UA仍显著升高;停止造模后第2周,HPD组血清UA恢复正常;LE组大鼠血清UA水平仍明显升高,第4周血清UA无统计学差异。结论:与高嘌呤饲料喂养比较,脂肪乳剂致大鼠高尿酸血症成型早、持续久、模型更稳定,与"饮食不节,过食膏粱厚味"所致代谢性疾病的发病特点更吻合,用于研究中药抗高尿酸血症的药效学有较大价值。其机制可能与其升高体内XOD,ADA酶活性,促进尿酸生成有关,同时,抑制尿酸排泄有关。

Due to the irregular of diet and overfeeding greasy and surfeit flavor closely associated with hyperuricemia disease, the lipid emulsion containing high cholesterol was used to model. To obtain a more stable and sustained animal model for the efficacy evaluation of traditional Chinese herbs, we observed the influence on the serum uric acid of rat induced by the lipid emulsion compared with high purine diet. 36 SD male rats were randomized to the normal control group, high purine diet group and lipid emulsion group respectively. The general behavior, body weight and daily food intake of rats were observed. The orbital blood was taken to separate into the serum and 24 hours urine was collected. The serum indexes such as UA, BUN, Cr, ALT, AST, TC, TG, LDL-c were determined every 2 weeks, and XOD, ADA enzyme activity were determined at the 4th week. The urine indexes such as UA, Cr and Cna/Ccr were determined at the 4th week. After stopping modeling, the serum UA were determined two weeks and four weeks later respectively. At the 2nd week, the body weight and daily food intake of rats in the lipid emulsion group reduced significantly, and the level of serum UA, BUN, Cr, TC, LDL-c, ATL, AST raised significantly meanwhile TG reduced. At the 4th week, the serum UA in high purine diet group did not raise, and the serum XOD raised obviously while ADA did not; the serum UA in lipid emulsion group was higher significantly, and the serum XOD and ADA raised while Cua/Ccr reduced obviously. At the 6th weeks, the serum UA in both the high purine diet group and lipid emulsion group raised obviously. After stopping modeling, the serum UA in lipid emulsion group still maintained a high level at the 2nd week and back to the normal level at the 4th week. Compared with high purine diet, the hyperuricemia model induced by lipid emulsion forms earlierand more stable. It maybe has great value to study the pharmacodynamics of traditional Chinese medicine treatment to hyperuricemia disease. Its mechanism may be related to increasing XOD and ADA enzyme activity which can promote uric acid synthesis, meanwhile inhibiting of uric acid excretion.