Rho相关的卷曲蛋白激酶(Rho-associated coiled-coil protein kinase,ROCK)是新近发现的与细胞凋亡相关的激酶,在多种细胞中均有表达,ROCK参与调节细胞的多种行为与功能,包括收缩、游走黏附、增殖及调亡。研究表明ROCK与血管再狭窄、心...Rho相关的卷曲蛋白激酶(Rho-associated coiled-coil protein kinase,ROCK)是新近发现的与细胞凋亡相关的激酶,在多种细胞中均有表达,ROCK参与调节细胞的多种行为与功能,包括收缩、游走黏附、增殖及调亡。研究表明ROCK与血管再狭窄、心肌损伤、心肌细胞凋亡及心力衰竭等有关联。展开更多
目的:观察Rho激酶抑制剂法舒地尔(Fasudil)对人高侵袭潜能HCC细胞株3(human high metastatic liver cancer cells 3,HCCLM3)侵袭转移的影响,并且探讨其作用的机制。方法:应用100 mol/L Fasudil作用于HCCLM3细胞,采用肌动蛋白微丝荧光染...目的:观察Rho激酶抑制剂法舒地尔(Fasudil)对人高侵袭潜能HCC细胞株3(human high metastatic liver cancer cells 3,HCCLM3)侵袭转移的影响,并且探讨其作用的机制。方法:应用100 mol/L Fasudil作用于HCCLM3细胞,采用肌动蛋白微丝荧光染色和侵袭小室实验观察HCCLM3细胞的运动侵袭能力。HCCLM3细胞经过处理后分为阴性对照组、Fasudil作用组、BTBD7干扰组,通过Western印迹检测BTB/POZ结构域蛋白7(BR-C,ttk and bab/pox virus domain containing 7,BTBD7)、Ras同系物家族成员C(ras homolog family member C,Rho C)、Rho关联卷曲螺旋蛋白激酶2(Rhoassociated,coiled-coil containing protein kinase 2,ROCK2)、MMP2和MMP9蛋白表达水平,酶谱分析法检测MMP2和MMP9活性水平。BTBD7干扰组作为阳性对照。结果:Fasudil处理后HCCLM3侵袭运动能力下降,BTBD7,Rho C,ROCK2蛋白表达下调,MMP2和MMP9活性降低,与阴性对照组比较差异有统计学意义(均P<0.01)。结论:Fasudil具有干预BTBD7-ROCK2信号通路、抑制HCC侵袭转移的重要作用。展开更多
The Rho/Rho-associated coiled-coil containing protein kinase（Rho/ROCK） pathway is a major signaling pathway in the central nervous system, transducing inhibitory signals to block regeneration. After central nervous ...The Rho/Rho-associated coiled-coil containing protein kinase（Rho/ROCK） pathway is a major signaling pathway in the central nervous system, transducing inhibitory signals to block regeneration. After central nervous system damage, the main cause of impaired regeneration is the presence of factors that strongly inhibit regeneration in the surrounding microenvironment. These factors signal through the Rho/ROCK signaling pathway to inhibit regeneration. Therefore, a thorough understanding of the Rho/ROCK signaling pathway is crucial for advancing studies on regeneration and repair of the injured central nervous system.展开更多
BACKGROUND: The increased β-arrestin-2 and its combination with G-protein-coupled receptors (GPCRs) lead to GPCRs desensitization. The latter may be responsible for decreased contractile reactivity in the mesenteric ...BACKGROUND: The increased β-arrestin-2 and its combination with G-protein-coupled receptors (GPCRs) lead to GPCRs desensitization. The latter may be responsible for decreased contractile reactivity in the mesenteric arteries of cirrhotic patients and rats. The present study is to investigate the machinery changes of α-adrenergic receptors and G proteins and their roles in the contractility of mesenteric arteries of cirrhotic patients and animal models. METHODS: Patients with cirrhosis due to hepatitis B and cirrhotic rats induced by CCl 4 were studied. Mesenteric artery contractility in response to norepinephrine was determined by a vessel perfusion system. The contractile effect of G protein-coupled receptor kinase-2 (GRK-2) inhibitor on the mesenteric artery was evaluated. The protein expression of the α 1 adrenergic receptor, G proteins, β-arrestin-2, GRK-2 as well as the activity of Rho associated coiled-coil forming protein kinase-1 (ROCK-1) were measured by Western blot. In addition, the interaction of α 1 adrenergic receptor with β-arrestin-2 was assessed by co-immunoprecipitation. RESULTS: The portal vein pressure of cirrhotic patients and rats was significantly higher than that of controls. The doseresponse curve to norepinephrine in mesenteric arteriole was shifted to the right, and EC 50 was significantly increased in cirrhotic patients and rats. There were no significant differences in the expressions of the α 1 adrenergic receptor and G proteins in the cirrhotic group compared with the controls. However, the protein expressions of GRK-2 and β-arrestin-2 were significantly elevated in cirrhotic patients and rats compared with those of the controls. The interaction of the α 1 adrenergic receptor and β-arrestin-2 was significantly aggravated. This interaction was significantly reversed by GRK-2 inhibitor. Both the protein expression and activity of ROCK-1 were significantly decreased in the mesenteric artery in patients with cirrhosis compared with those of the controls, and this phenomenon was not shown in the cirrhotic rats. Norepinephrine significantly increased the activity of ROCK-1 in normal rats but not in cirrhotic ones. Norepinephrine significantly increased ROCK-1 activity in cirrhotic rats when GRK-2 inhibitor was used. CONCLUSIONS: β-arrestin-2 expression and its interaction with GPCRs are significantly upregulated in the mesenteric arteries in patients and rats with cirrhosis. These upregulations result in GPCR desensitization, G-protein dysfunction and ROCK inhibition. These may explain the decreased contractility of the mesenteric artery in response to vasoconstrictors.展开更多
文摘Rho相关的卷曲蛋白激酶(Rho-associated coiled-coil protein kinase,ROCK)是新近发现的与细胞凋亡相关的激酶,在多种细胞中均有表达,ROCK参与调节细胞的多种行为与功能,包括收缩、游走黏附、增殖及调亡。研究表明ROCK与血管再狭窄、心肌损伤、心肌细胞凋亡及心力衰竭等有关联。
文摘目的:观察Rho激酶抑制剂法舒地尔(Fasudil)对人高侵袭潜能HCC细胞株3(human high metastatic liver cancer cells 3,HCCLM3)侵袭转移的影响,并且探讨其作用的机制。方法:应用100 mol/L Fasudil作用于HCCLM3细胞,采用肌动蛋白微丝荧光染色和侵袭小室实验观察HCCLM3细胞的运动侵袭能力。HCCLM3细胞经过处理后分为阴性对照组、Fasudil作用组、BTBD7干扰组,通过Western印迹检测BTB/POZ结构域蛋白7(BR-C,ttk and bab/pox virus domain containing 7,BTBD7)、Ras同系物家族成员C(ras homolog family member C,Rho C)、Rho关联卷曲螺旋蛋白激酶2(Rhoassociated,coiled-coil containing protein kinase 2,ROCK2)、MMP2和MMP9蛋白表达水平,酶谱分析法检测MMP2和MMP9活性水平。BTBD7干扰组作为阳性对照。结果:Fasudil处理后HCCLM3侵袭运动能力下降,BTBD7,Rho C,ROCK2蛋白表达下调,MMP2和MMP9活性降低,与阴性对照组比较差异有统计学意义(均P<0.01)。结论:Fasudil具有干预BTBD7-ROCK2信号通路、抑制HCC侵袭转移的重要作用。
基金supported by a grant from the National Natural Science Foundation of ChinaNo.8147108781170577
文摘The Rho/Rho-associated coiled-coil containing protein kinase（Rho/ROCK） pathway is a major signaling pathway in the central nervous system, transducing inhibitory signals to block regeneration. After central nervous system damage, the main cause of impaired regeneration is the presence of factors that strongly inhibit regeneration in the surrounding microenvironment. These factors signal through the Rho/ROCK signaling pathway to inhibit regeneration. Therefore, a thorough understanding of the Rho/ROCK signaling pathway is crucial for advancing studies on regeneration and repair of the injured central nervous system.
基金supported by a grant from the National Natural Science Foundation of China (30972920)
文摘BACKGROUND: The increased β-arrestin-2 and its combination with G-protein-coupled receptors (GPCRs) lead to GPCRs desensitization. The latter may be responsible for decreased contractile reactivity in the mesenteric arteries of cirrhotic patients and rats. The present study is to investigate the machinery changes of α-adrenergic receptors and G proteins and their roles in the contractility of mesenteric arteries of cirrhotic patients and animal models. METHODS: Patients with cirrhosis due to hepatitis B and cirrhotic rats induced by CCl 4 were studied. Mesenteric artery contractility in response to norepinephrine was determined by a vessel perfusion system. The contractile effect of G protein-coupled receptor kinase-2 (GRK-2) inhibitor on the mesenteric artery was evaluated. The protein expression of the α 1 adrenergic receptor, G proteins, β-arrestin-2, GRK-2 as well as the activity of Rho associated coiled-coil forming protein kinase-1 (ROCK-1) were measured by Western blot. In addition, the interaction of α 1 adrenergic receptor with β-arrestin-2 was assessed by co-immunoprecipitation. RESULTS: The portal vein pressure of cirrhotic patients and rats was significantly higher than that of controls. The doseresponse curve to norepinephrine in mesenteric arteriole was shifted to the right, and EC 50 was significantly increased in cirrhotic patients and rats. There were no significant differences in the expressions of the α 1 adrenergic receptor and G proteins in the cirrhotic group compared with the controls. However, the protein expressions of GRK-2 and β-arrestin-2 were significantly elevated in cirrhotic patients and rats compared with those of the controls. The interaction of the α 1 adrenergic receptor and β-arrestin-2 was significantly aggravated. This interaction was significantly reversed by GRK-2 inhibitor. Both the protein expression and activity of ROCK-1 were significantly decreased in the mesenteric artery in patients with cirrhosis compared with those of the controls, and this phenomenon was not shown in the cirrhotic rats. Norepinephrine significantly increased the activity of ROCK-1 in normal rats but not in cirrhotic ones. Norepinephrine significantly increased ROCK-1 activity in cirrhotic rats when GRK-2 inhibitor was used. CONCLUSIONS: β-arrestin-2 expression and its interaction with GPCRs are significantly upregulated in the mesenteric arteries in patients and rats with cirrhosis. These upregulations result in GPCR desensitization, G-protein dysfunction and ROCK inhibition. These may explain the decreased contractility of the mesenteric artery in response to vasoconstrictors.
