结缔组织生长因子在单侧输尿管梗阻大鼠肾组织中的表达

目的：检测大鼠单侧输尿管梗阻（UUO）模型不同时期，肾组织中结缔组织生长因子（CTGF）、转化生长因子β1（TGF-β1）和α-平滑肌肌动蛋白（α-SMA）的表达，观察比较在间质纤维化不同阶段，3者的动态变化及关系。 方法： 采用雄性SD大鼠36只，分为假手术组和模型组，模型组行左侧输尿管结扎术，再分3、7、14、21和28 d共6组，每组6只，于各时点处死大鼠，取肾组织，常规HE、Masson染色，按小管间质损害的特征进行半定量评分。免疫组化检测CTGF、TGF-β1和α-SMA表达。 结果： 随梗阻时间的延长，小管间质纤维化加重，28 d间质已基本被纤维化组织所代替。随间质纤维化程度的加重，CTGF和α-SMA表达逐渐增加，两者与小管间质损害积分呈正相关，CTGF与α-SMA的表达之间也呈正相关。TGF-β1表达在7-14 d达高峰后，逐渐减少，但仍高于对照组。 结论： UUO致CTGF表达增加可能与TGF-β升高有关，CTGF可能通过促进间质中肌成纤维细胞的形成而参与肾间质纤维化。

Expression of connective tissue growth factor in the renal tissue of rats with unilateral ureteral obstruction

AIM: To detect the expression of connective tissue growth factor (CTGF), transforming growth factor-β1 (TGF-β1) and α-smooth muscle actin (α-SMA) in rat unilateral ureteral obstructive (UUO) nephropathy animal model, and to observe the kinetic changes at different stages of firosis. METHODS: Male SD rats were subjected to either left ureteral ligation or sham operation, then killed at 3, 7, 14, 21 or 28 days after UUO or sham operation (n=6 at each time point). HE, Masson or PAS staining were applied to the renal tissue sections. The extent of tubulointerstitial injury was determined by Banff classification. RESULTS: The extent of tubulinterstitial fibrosis became serious with the time of obstruction. Tubules were mostly atropic and replaced by proliferative fibrous tissue at day 28. The expression of CTGF and α-SMA were consistent with the damage of tubulointerstitial. The positive correlation among CTGF or α-SMA and the tubulointerstitial injury scores were significant. The expression of TGF-β1 came to peak at day 7 to 14, and gradually decreased at day 21 and 28. CONCLUSION: These results indicate that the expression of CTGF may be upregulated by TGF-β in UUO rats, and CTGF may be involved in tubulointerstitial fibrosis through the development of myofibroblasts.