AIM: To investigate the effects of AT1 (Type 1 angiotensin Ⅱ receptor) antagonist (Losartan) on the apoptosis,proliferation and migration of the human pancreaticstellate cells (hPSCs).METHODS: hPSCs were isolated fro...AIM: To investigate the effects of AT1 (Type 1 angiotensin Ⅱ receptor) antagonist (Losartan) on the apoptosis,proliferation and migration of the human pancreaticstellate cells (hPSCs).METHODS: hPSCs were isolated from pancreatic sample of patients with pancreatic carcinoma using radioimmunoassay (RIA) technique to detect the concentration of AngⅡ in culture media and cell homogenate. Immunocytochemistry (ICC) and in situ hybridization (ISH) methods were utilized to test AT1 expression in hPSCs. Effects of Losartan on hPSCs proliferation, apoptosis and migration were investigated using BrdU incorporation, TUNEL, flow cytometry (FCM),and phase-contrast microscope separately when cells treated with Losartan. Immunofluorescence and Western blot were applied to quantify the expression of type Ⅰ collagen in hPSCs.RESULTS: There exists AT1 expression in hPSCs, while no AngⅡ was detected in culture media and cell homogenate. Losartan induces cell apoptosis in a doseand time-dependent manner (apparently at 10-5 mol/L),no pro-proliferative effect was observed in the same condition.Corresponding dosage of Losartan can also alleviate the motion capability and type Ⅰ collagen content of hPSCs compared with AngⅡ treatment and non-treatment control groups.CONCLUSION: These findings suggest that paracrine not autocrine functions of AngⅡ may have effects on hPSCs,which was mediated by AT1 expressed on cells, while Losartan may exert anti-fibrotic effects by inhibiting hPSCs motion and partly by inducing apoptosis.展开更多
AIM To investigate effect of losartan,an AT1receptor antagonist,on hepatic fibrosis induced byCCl<sub>;</sub>and to determine whether or not AT1receptors are expressed on hepatic stellate cells,METHODS AND...AIM To investigate effect of losartan,an AT1receptor antagonist,on hepatic fibrosis induced byCCl<sub>;</sub>and to determine whether or not AT1receptors are expressed on hepatic stellate cells,METHODS AND RESULTS Fifty male Sprague-Dawley rats,weighing（180±20）g,wererandomized into five groups（control group,modelgroup,and three losartan treated groups）,inwhich all rats were given the subcutaneousinjection of 40% CCl<sub>4</sub>（every 3 days for 6 weeks）except for rats of control group.Rats of losartan-treated groups were treated with losartan（20 mg/kg,10 mg/kg,5 mg/kg,daily gavage）,After 6weeks liver tissue and serum samples of all ratswere examined.Serum hyaluronic acid（HA）,procollagen typeⅢ（PCⅢ）were detected byradioimmunoassays,van Giesion collagen stainingwas used to evaluate the extracellular matrix of ratswith liver fibrosis.The expression of AT1receptors,transforming growth factor-beta（TGF-β）,and alpha-smooth muscle actin（a-SMA）inliver tissue were determined byimmunohistochemical techniques.Compared withmodel group,serum ALT and AST of losartan-treated groups were significantly reduced（t=4.20,P【0.01 and t=4.57,P【0.01）.Serum HAand PCⅢalso had significant differences（t=3.53,P【0.01 and t=2.20,P【0.05）.Thedegree of fibrosis was improved by losartan and correlated with the expressions of AT1 receptors,TGF-β,and α-SMA in liver tissue.CONCLUSION AT1 receptor antagonist,losartan,could limit the progression of the hepatic fibrosisinduced by CCl<sub>4</sub>.The mechanism may be related tothe decrease in the expression of AT1 receptorsand TGF-β,ameliorating the injury of hepatocytes;activation of local renin-angiotensin system mightrelate to hepatic fibrosis;and during progressionof fibrosis,activated hepatic stellate cells mightexpress AT1 receptors.展开更多
目的探讨应激性心肌病发生时血清血管紧张素Ⅱ水平的变化,并观察血管紧张素Ⅱ受体拮抗药缬沙坦在防治应激性心肌病的作用。方法 18只2周龄的雌性大白兔随机分为对照组、实验组和干预组,在0、7和14 d抽血,酶联免疫法吸附试验(enzymelinke...目的探讨应激性心肌病发生时血清血管紧张素Ⅱ水平的变化,并观察血管紧张素Ⅱ受体拮抗药缬沙坦在防治应激性心肌病的作用。方法 18只2周龄的雌性大白兔随机分为对照组、实验组和干预组,在0、7和14 d抽血,酶联免疫法吸附试验(enzymelinked immunosorbent assay,ELISA)检测血管紧张素Ⅱ(angiotensinⅡ,AngⅡ)浓度变化;第14天Western blot检测血管紧张素Ⅱ一型受体(angiotensinⅡreceptor t y pe 1,AT1)、血管紧张素Ⅱ二型受体(angiotensinⅡreceptor type 2,AT2)的表达;HE染色观察各组心肌组织变化情况。结果在0、7和14 d,实验组和干预组的血清中A ngⅡ浓度显著高于对照组(P<0.05);第14天实验组心尖组织AT1表达较对照组显著降低(P<0.05),而干预组与对照组相比差异无统计学意义。实验组和干预组AT2表达较对照组显著升高(P<0.05)。HE染色显示实验组动物心尖部游离壁较对照组显著变薄(P<0.05),而干预组与对照组差异无统计学意义;实验组心尖部心肌组织可见典型的应激性心肌病心肌改变,干预组无此变化。结论 AngⅡ可能参与了应激性心肌病的发生,AT1受体拮抗药缬沙坦可以防治应激性心肌病的发生。展开更多
基金Supported by Shanghai Sanitary Bureau Foundation, No. 40306
文摘AIM: To investigate the effects of AT1 (Type 1 angiotensin Ⅱ receptor) antagonist (Losartan) on the apoptosis,proliferation and migration of the human pancreaticstellate cells (hPSCs).METHODS: hPSCs were isolated from pancreatic sample of patients with pancreatic carcinoma using radioimmunoassay (RIA) technique to detect the concentration of AngⅡ in culture media and cell homogenate. Immunocytochemistry (ICC) and in situ hybridization (ISH) methods were utilized to test AT1 expression in hPSCs. Effects of Losartan on hPSCs proliferation, apoptosis and migration were investigated using BrdU incorporation, TUNEL, flow cytometry (FCM),and phase-contrast microscope separately when cells treated with Losartan. Immunofluorescence and Western blot were applied to quantify the expression of type Ⅰ collagen in hPSCs.RESULTS: There exists AT1 expression in hPSCs, while no AngⅡ was detected in culture media and cell homogenate. Losartan induces cell apoptosis in a doseand time-dependent manner (apparently at 10-5 mol/L),no pro-proliferative effect was observed in the same condition.Corresponding dosage of Losartan can also alleviate the motion capability and type Ⅰ collagen content of hPSCs compared with AngⅡ treatment and non-treatment control groups.CONCLUSION: These findings suggest that paracrine not autocrine functions of AngⅡ may have effects on hPSCs,which was mediated by AT1 expressed on cells, while Losartan may exert anti-fibrotic effects by inhibiting hPSCs motion and partly by inducing apoptosis.
文摘AIM To investigate effect of losartan,an AT1receptor antagonist,on hepatic fibrosis induced byCCl<sub>;</sub>and to determine whether or not AT1receptors are expressed on hepatic stellate cells,METHODS AND RESULTS Fifty male Sprague-Dawley rats,weighing（180±20）g,wererandomized into five groups（control group,modelgroup,and three losartan treated groups）,inwhich all rats were given the subcutaneousinjection of 40% CCl<sub>4</sub>（every 3 days for 6 weeks）except for rats of control group.Rats of losartan-treated groups were treated with losartan（20 mg/kg,10 mg/kg,5 mg/kg,daily gavage）,After 6weeks liver tissue and serum samples of all ratswere examined.Serum hyaluronic acid（HA）,procollagen typeⅢ（PCⅢ）were detected byradioimmunoassays,van Giesion collagen stainingwas used to evaluate the extracellular matrix of ratswith liver fibrosis.The expression of AT1receptors,transforming growth factor-beta（TGF-β）,and alpha-smooth muscle actin（a-SMA）inliver tissue were determined byimmunohistochemical techniques.Compared withmodel group,serum ALT and AST of losartan-treated groups were significantly reduced（t=4.20,P【0.01 and t=4.57,P【0.01）.Serum HAand PCⅢalso had significant differences（t=3.53,P【0.01 and t=2.20,P【0.05）.Thedegree of fibrosis was improved by losartan and correlated with the expressions of AT1 receptors,TGF-β,and α-SMA in liver tissue.CONCLUSION AT1 receptor antagonist,losartan,could limit the progression of the hepatic fibrosisinduced by CCl<sub>4</sub>.The mechanism may be related tothe decrease in the expression of AT1 receptorsand TGF-β,ameliorating the injury of hepatocytes;activation of local renin-angiotensin system mightrelate to hepatic fibrosis;and during progressionof fibrosis,activated hepatic stellate cells mightexpress AT1 receptors.
文摘目的探讨应激性心肌病发生时血清血管紧张素Ⅱ水平的变化,并观察血管紧张素Ⅱ受体拮抗药缬沙坦在防治应激性心肌病的作用。方法 18只2周龄的雌性大白兔随机分为对照组、实验组和干预组,在0、7和14 d抽血,酶联免疫法吸附试验(enzymelinked immunosorbent assay,ELISA)检测血管紧张素Ⅱ(angiotensinⅡ,AngⅡ)浓度变化;第14天Western blot检测血管紧张素Ⅱ一型受体(angiotensinⅡreceptor t y pe 1,AT1)、血管紧张素Ⅱ二型受体(angiotensinⅡreceptor type 2,AT2)的表达;HE染色观察各组心肌组织变化情况。结果在0、7和14 d,实验组和干预组的血清中A ngⅡ浓度显著高于对照组(P<0.05);第14天实验组心尖组织AT1表达较对照组显著降低(P<0.05),而干预组与对照组相比差异无统计学意义。实验组和干预组AT2表达较对照组显著升高(P<0.05)。HE染色显示实验组动物心尖部游离壁较对照组显著变薄(P<0.05),而干预组与对照组差异无统计学意义;实验组心尖部心肌组织可见典型的应激性心肌病心肌改变,干预组无此变化。结论 AngⅡ可能参与了应激性心肌病的发生,AT1受体拮抗药缬沙坦可以防治应激性心肌病的发生。
