目的 探讨血管紧张素(1-7)[Ang-(1-7)]对胆管结扎(BDL)大鼠肝纤维化的抑制作用.方法 18只Wister雄性大鼠随机分为假手术(SHAME组)组,BDL组和Ang-(1-7)治疗组.假手术组:行开腹术再关腹,在腹腔埋注射泵,以25μg·kg-1·h-1的速度持续注射生理盐水；BDL组:开腹结扎胆总管建立肝纤维化模型,在腹腔埋注射泵,以25 μg·kg-1·h-1的速度持续注射生理盐水；Ang-(1-7)治疗组:BDL建立肝纤维化模型,同时在腹腔埋注射泵,以25 μg·kg-1·h-1的速度持续注射Ang-(1-7).4周后宰杀动物、取肝组织,行Masson胶原染色,肝纤维化评分,测定羟脯氨酸含量,免疫组织化学检测α-肌动蛋白(α-SMA)的表达.结果 与BDL组相比,Ang-(1-7)治疗组肝纤维化评分(2.33±0.52vs 5.17±0.75)、胶原面积(23.71±3.43vs 89.77±9.92)、羟脯氨酸含量(0.36±0.03 vs 0.52±0.04)、α-SMA的表达(54.11±17.55vs 191.84±31.72)均减少,有统计学意义(P＜0.01).结论 Ang-(1-7)对胆总管结扎所致的肝纤维化具有抑制作用.%Objective To observe the inhibitory effect of angiotensin-(1-7) on liver fibrosis induced by bile duct ligation in Tats. Methods Eighteen Wistar rats were randomized into 3 groups and subject to sham operation, bile duct ligation (BDL), or BDL with angiotensin-(1-7) treatment. An osmotic minipump was implanted intraperitoneally for administration of saline in the sham-operated and BDL groups and angiotensin-(1-7) (25 μg·kg-1·h-1) in angiotensin-(1-7) treatment group. After a 4-week treatments, the fibrosis score, Masson staining, and hydroxyproline assay were used to evaluate the level of liver fibrosis in the rats, and irnrnunohistochemistry was used to detect expression of a-smooth muscle actin (a-SMA) in the liver tissue. Results Compared with BDL group, a 4-week treatment with angiotensin-(1-7) following BDL significantly reduced the fibrosis score (2.33 ±0.52 vs 5.17 +0.75), hydroxyproline content (0.36±0.03 vs 0.52±0.04) and a-SMA expression (54.11±17.55 vs 191.84±31.72) in the liver tissue of the rats (P<0.01). Conclusion Prolonged infusion of angiotensin-(1-7) inhibit the formation of hepatic fibrosis in rats following bile duct ligation.
展开▼
