摘要
目的观察大豆蛋白饮食对5/6肾切除大鼠血管早期病变的影响并探讨其可能的机制。方法把40只大鼠随机分为手术组和假手术组,手术组大鼠行5/6肾切除术后又随机分为对照组(20%酪蛋白),低蛋白组(6%酪蛋白),大豆蛋白组(6%大豆蛋白)。假手术组予以普通酪蛋白饲料饮食。于术前、术后4周、8周及12周观察大鼠的营养状况,并检测其血清尿素氮(BUN)、肌酐(Scr)、胆固醇(TC)、三酰甘油(TG)、白蛋白(Alb)以及尿蛋白量(24h)等指标。12周后处死所有大鼠,并留取其主动脉弓组织,行HE染色观察主动脉弓病理变化,并行免疫组化染色检测其单核细胞趋化蛋白(MCP)1和植物血凝素样氧化低密度脂蛋白受体(LOX)1的表达水平。结果5/6肾切除大鼠各组BUN、Scr从第4周起均开始升高,但低蛋白组及大豆蛋白组BUN、Scr上升的程度较对照组缓慢,且以大豆蛋白组最为显著[12周Scr,(111.44±5.50)比(172.00±9.54)μmol/L,P〈0.01]。与假手术组相比,5/6肾切除大鼠各组血白蛋白水平均显著降低(P〈0.01),但各手术组间差异无统计学意义。5/6肾切除大鼠各组尿蛋白量(24h)随时间的延长持续增加,但低蛋白组、大豆蛋白组的增加幅度较小(P〈0.01)。各组大鼠主动脉弓组织未见明显病理改变。免疫组化检查发现,大豆蛋白组大鼠主动脉弓内膜MCP-1(155.68±4.84比132.80±5.67)和LOX-1(195.48±4.95比167.46±7.62)染色灰度值明显高于对照组(P〈0.01)。结论大豆蛋白饮食能有效抑制5/6肾切除大鼠的大动脉内膜的MCP-1和LOX-1的表达,提示大豆蛋白饮食有助于减轻慢性肾衰大鼠的早期血管病变。
Objective To investigate the impact of the soy protein diet on the early vasculopathy of the 5/6 nephrectomized rats and explore its mechanism. Methods The 5/6 nephrectomized SD rats were used. After operation, 20% casein diet (control group), 6% casein diet and 6% soy protein diet were delivered respectively. Serum albumin, Scr, BUN, triglyceride, cholesterol and urine albumin were measured before the operation, four, eight and twelve weeks after operation. All the rats were killed after twelve weeks. The pathological changes of aortic arch were evaluated and immunohisttochemistry was used to examine the expression of monocyte chemoattractant protein-1(MCP-1) and lectin-like oxidized low density lipoprotein receptor-1(LOX-1). Results The soy protein diet could lower the urine albumin, Scr, BUN, serum cholesterol and triglyceride. Scr at the 12th week was (111.44 ±5.50) μmol/L in soy group and (172.00±9.54) μmol/L in control group (P〈0.01). There was no significant pathological changes in the aortic arch. The soy protein diet could decrease the expression of the MCP-1 (155.68±4.84 vs 5.67)and the LOX-1 (195.48±4.95 vs 167.46±7.62) in the aortic arch. Conclusion protein diet can inhibit the inflammation in aortic intima and delay the progression 132.80± The soy of early vasculopathy of the 5/6 nephrectomized SD rats.
出处
《中华肾脏病杂志》
CAS
CSCD
北大核心
2007年第8期529-533,共5页
Chinese Journal of Nephrology