姜黄素对大鼠肾毒血清肾炎肾组织细胞外基质积聚的影响

目的:观察姜黄素是否抑制肾炎大鼠肾组织Ⅳ型胶原和纤维连接蛋白(fibronectin, FN)的积聚而对肾脏起保护作用.方法:72只雄性SD大鼠随机分成3组,每组24只.对照组尾静脉及腹腔注射生理盐水作对照;模型组尾静脉注射肾毒血清0.5 ml/d,连用2 d,腹腔注射二甲亚砜0.5 ml*kg-1*d-1;姜黄素组尾静脉注射肾毒血清0.5 ml/d,连用2 d,同时腹腔注射姜黄素50 mg*kg-1*d-1.分别于第3、7、14、28天各处死6只大鼠,部分肾组织福尔马林固定、石蜡包埋后进行免疫组织化学染色.结果:对照组大鼠肾小球基膜Ⅳ型胶原以及FN染色弱阳性.模型组大鼠肾小球Ⅳ型胶原和FN沉积的范围随着病程的进展逐渐增多,与相应时间对照组比较有显著差异(P ＜0.01).姜黄素组肾小球Ⅳ型胶原和FN沉积的范围亦随时间的发展逐渐扩大,然而Ⅳ型胶原较同期模型组比较染色范围却明显缩小 (P ＜0.01) ,而FN于7 d后才比模型组减少(P ＜0.01). 结论:姜黄素可抑制肾炎组织内Ⅳ型胶原和FN的积聚并可能延缓肾小球硬化的发生发展.

Effect of curcumin on extracellular matrix accumulation in the glomeruli in nephrotoxic sera nephritis rats

OBJECTIVE: To observe whether curcumin could inhibit the accumulation of the collagen IV and fibronectin in the glomeruli in nephrotoxi sera nephritis rats. METHODS: Seventy-two healthy male Sprague-Dawley rats were divided into three groups, with 24 animals in each group. For normal control group, normal saline (0.5 ml/d) was injected through intra-caudal-vein for two days, and at the same time normal saline (0.5 ml/kg) was also daily administered intraperitoneally. For nephrotoxic sera nephritis group, nephrotoxic sera (0.5 ml/d) was injected through the tail vein for two days and dimethyl sulfoxide (0.5 ml/kg) was given intraperitoneally daily. For curcumin group, nephrotoxic sera was injected as above and meanwhile curcumin (50 mg.kg(-1).d(-1)) was administered intraperitoneally every day. Six rats in each group were killed on the 3rd, 7th, 14th and 28th day. Their renal tissue was fixed in 10% formalin for examining the expression of collagen IV and fibronectin. RESULTS: Minimal staining of collagen IV and fibronectin was detected in the basement membrane of normal control rats glomeruli. In the nephrotoxic sera nephritis rats and curcumin treated nephrotoxic sera nephritis rats, the accumulation of collagen IV and fibronectin was increased progressively, with significant difference in the accumulation of collagen IV (P<0.01) between these two groups at the same time points, while the significant difference in fibronectin accumulation (P<0.05) appeared only after the 7th days. CONCLUSION: Curcumin can reduce the accumulation of collagen IV and fibronectin in the glomeruli. Hence we postulated that curcumin might have beneficial effect for retarding glomerulosclerosis.