AIMTo determine whether small interfering RNA (siRNA) of PGC-1α could inhibit vascular endothelial growth factor (VEGF) expression and tube formation in human retinal vascular endothelial cells (hRVECs).ME...AIMTo determine whether small interfering RNA (siRNA) of PGC-1α could inhibit vascular endothelial growth factor (VEGF) expression and tube formation in human retinal vascular endothelial cells (hRVECs).METHODShRVECs transfected with peroxisome proliferator-activated receptor-γ coactivator-1α (PGC-1α) siRNA were incubated for 24h and then placed into a normoxic (20%, O<sub>2</sub>) or hypoxic (1%, O<sub>2</sub>) environment for another 16h. PGC-1α mRNA and protein levels were detected by real-time PCR and Western blot. VEGF mRNA and protein levels were detected by real-time PCR and ELISA. Cell proliferation was evaluated by BrdU incorporation assay. Forty-eight hours after siRNA transfection, hRVECs were planted into Matrigel-coated plates and cultured under normoxic (20%, O<sub>2</sub>) or hypoxic (1%, O<sub>2</sub>) conditions for another 48h. The tube formation of hRVECs was observed under an optical microscope and quantified by counting the number of branch points and calculating the total tube length.RESULTSPGC-1α mRNA and protein levels were significantly reduced by PGC-1α siRNA, and VEGF mRNA and protein levels also decreased significantly. The percentage of BrdU-labeled cells in siPGC-1α groups were significantly decreased compared with control siRNA groups under normoxia and hypoxia in cell proliferation assay. In the tube formation assay, PGC-1α siRNA treated cells formed significantly fewer tubes.CONCLUSIONBlocking PGC-1α expression can inhibit VEGF expression in hRVECs and inhibit their ability to form tubes under both normoxic and hypoxic conditions.展开更多
目的:通过观察丹参多酚酸盐对膜性肾病(MN)大鼠肾组织中腺苷酸活化蛋白激酶(AMPK)、沉默信息调节因子(Sirt1)、过氧化物酶体增殖物激活受体γ辅激活因子-1α(PGC-1α)蛋白的表达及细胞自噬和凋亡的情况,探讨其治疗MN的可能的分子机制。...目的:通过观察丹参多酚酸盐对膜性肾病(MN)大鼠肾组织中腺苷酸活化蛋白激酶(AMPK)、沉默信息调节因子(Sirt1)、过氧化物酶体增殖物激活受体γ辅激活因子-1α(PGC-1α)蛋白的表达及细胞自噬和凋亡的情况,探讨其治疗MN的可能的分子机制。方法:80只雄性SD大鼠随机分为正常组,模型组,盐酸贝那普利组(10 mg·kg^(-1)),丹参多酚酸盐低、中、高剂量组(16.7、33.3、66.7 mg·kg^(-1)),通过尾静脉注射阳离子化牛血清白蛋白(C-BSA)的方法造模。造模成功后,各组按照相应比例剂量连续给药4周后留取24 h尿、血清和肾组织,尿液用于检测24 h尿蛋白定量(24 h UTP)、血清用于检测血尿素氮(BUN)、血肌酐(SCr)、白细胞介素-6(IL-6)、肿瘤坏死因子-α(TNF-α)、C反应蛋白(CRP)、谷胱甘肽过氧化物酶(GSH-Px)、超氧化物歧化酶(SOD)、丙二醛(MDA)的含量。采用光镜、电镜、免疫荧光法观察肾脏病理学变化,蛋白免疫印迹法(Western blot)检测大鼠肾组织磷酸化(p)-AMPK、AMPK、p-Sirt1、Sirt1、PGC-1α蛋白表达水平;免疫组化(IHC)检测大鼠肾组织自噬特异性基因-1(Beclin-1)、微管相关蛋白1轻链3(LC3)Ⅱ、泛素结合蛋白(p62)、B细胞淋巴瘤(Bcl)-2、Bcl-2相关X蛋白(Bax)、胱天蛋白酶(Caspase)-7蛋白表达水平。结果:与正常组比较,模型组大鼠24 h UTP、IL-6、TNF-α、CRP、MDA水平显著升高(P<0.01),SOD和GSH-Px水平显著降低(P<0.01),BUN、SCr变化差异无统计学意义;与模型组比较,丹参多酚酸盐低中高剂量组和贝那普利组大鼠24 h UTP、IL-6、TNF-α、CRP、MDA水平显著降低(P<0.01),SOD和GSH-Px水平显著升高(P<0.01)。在苏木素-伊红(HE)、马松(Masson)染色、免疫荧光及电镜下观察可见模型组大鼠肾组织病理损伤明显,贝那普利和丹参多酚酸盐治疗后,肾组织细胞的病理损伤逐渐改善。与正常组比较,模型组大鼠肾脏p-AMPK/AMPK、p-Sirt1/Sirt1、PGC-1α、Bcl-2、Beclin-1、LC3Ⅱ�展开更多
Background Prenatal hyperglycaemia may increase metabolic syndrome susceptibility of the offspring. An underlying component of the development of these morbidities is hepatic gluconeogenic molecular dysfunction. We hy...Background Prenatal hyperglycaemia may increase metabolic syndrome susceptibility of the offspring. An underlying component of the development of these morbidities is hepatic gluconeogenic molecular dysfunction. We hypothesized that maternal hyperglycaemia will influence her offsprings hepatic peroxisome proliferator-activated receptor coactivator-la （PGC-la） expression, a key regulator of glucose production in hepatocytes. Method We established maternal hyperglycaemia by streptozotocin injection to induce the maternal hyperglycaemic Wistar rat model. Offspring from the severe hyperglycemia group （SDO） and control group （CO） were monitored until 180 days after birth. Blood pressure, lipid metabolism indicators and insulin resistance （IR） were measured. Hepatic PGC-la expression was analyzed by reverse transcription polymerase chain reaction and Western blotting, mRNA expression of two key enzymes in gluconeogenesis, glucose-6-phospha-tase （G-6-Pase） and phosphoenolpyruvate carboxykinase （PEPCK）, were analyzed and compared. Results In the SDO group, PGC-la expression at protein and mRNA levels were increased, so were expression of G-6-Pase and PEPCK （P〈0.05）. The above effects were seen prior to the onset of IR. Conclusion The hepatic gluconeogenic molecular dysfunction may contribute to the metabolic morbidities experienced by this population.展开更多
INTRODUCTIONAccording to the demographics, the world population over 60 years will double from 605 million to 2 billion people between 2000 and 2050. Aging is a complex process in which the organism and its ability to...INTRODUCTIONAccording to the demographics, the world population over 60 years will double from 605 million to 2 billion people between 2000 and 2050. Aging is a complex process in which the organism and its ability to respond to external stresses become progressive decline.展开更多
基金Supported by National Natural Science Fundation of China(No.81000387)
文摘AIMTo determine whether small interfering RNA (siRNA) of PGC-1α could inhibit vascular endothelial growth factor (VEGF) expression and tube formation in human retinal vascular endothelial cells (hRVECs).METHODShRVECs transfected with peroxisome proliferator-activated receptor-γ coactivator-1α (PGC-1α) siRNA were incubated for 24h and then placed into a normoxic (20%, O<sub>2</sub>) or hypoxic (1%, O<sub>2</sub>) environment for another 16h. PGC-1α mRNA and protein levels were detected by real-time PCR and Western blot. VEGF mRNA and protein levels were detected by real-time PCR and ELISA. Cell proliferation was evaluated by BrdU incorporation assay. Forty-eight hours after siRNA transfection, hRVECs were planted into Matrigel-coated plates and cultured under normoxic (20%, O<sub>2</sub>) or hypoxic (1%, O<sub>2</sub>) conditions for another 48h. The tube formation of hRVECs was observed under an optical microscope and quantified by counting the number of branch points and calculating the total tube length.RESULTSPGC-1α mRNA and protein levels were significantly reduced by PGC-1α siRNA, and VEGF mRNA and protein levels also decreased significantly. The percentage of BrdU-labeled cells in siPGC-1α groups were significantly decreased compared with control siRNA groups under normoxia and hypoxia in cell proliferation assay. In the tube formation assay, PGC-1α siRNA treated cells formed significantly fewer tubes.CONCLUSIONBlocking PGC-1α expression can inhibit VEGF expression in hRVECs and inhibit their ability to form tubes under both normoxic and hypoxic conditions.
文摘目的:通过观察丹参多酚酸盐对膜性肾病(MN)大鼠肾组织中腺苷酸活化蛋白激酶(AMPK)、沉默信息调节因子(Sirt1)、过氧化物酶体增殖物激活受体γ辅激活因子-1α(PGC-1α)蛋白的表达及细胞自噬和凋亡的情况,探讨其治疗MN的可能的分子机制。方法:80只雄性SD大鼠随机分为正常组,模型组,盐酸贝那普利组(10 mg·kg^(-1)),丹参多酚酸盐低、中、高剂量组(16.7、33.3、66.7 mg·kg^(-1)),通过尾静脉注射阳离子化牛血清白蛋白(C-BSA)的方法造模。造模成功后,各组按照相应比例剂量连续给药4周后留取24 h尿、血清和肾组织,尿液用于检测24 h尿蛋白定量(24 h UTP)、血清用于检测血尿素氮(BUN)、血肌酐(SCr)、白细胞介素-6(IL-6)、肿瘤坏死因子-α(TNF-α)、C反应蛋白(CRP)、谷胱甘肽过氧化物酶(GSH-Px)、超氧化物歧化酶(SOD)、丙二醛(MDA)的含量。采用光镜、电镜、免疫荧光法观察肾脏病理学变化,蛋白免疫印迹法(Western blot)检测大鼠肾组织磷酸化(p)-AMPK、AMPK、p-Sirt1、Sirt1、PGC-1α蛋白表达水平;免疫组化(IHC)检测大鼠肾组织自噬特异性基因-1(Beclin-1)、微管相关蛋白1轻链3(LC3)Ⅱ、泛素结合蛋白(p62)、B细胞淋巴瘤(Bcl)-2、Bcl-2相关X蛋白(Bax)、胱天蛋白酶(Caspase)-7蛋白表达水平。结果:与正常组比较,模型组大鼠24 h UTP、IL-6、TNF-α、CRP、MDA水平显著升高(P<0.01),SOD和GSH-Px水平显著降低(P<0.01),BUN、SCr变化差异无统计学意义;与模型组比较,丹参多酚酸盐低中高剂量组和贝那普利组大鼠24 h UTP、IL-6、TNF-α、CRP、MDA水平显著降低(P<0.01),SOD和GSH-Px水平显著升高(P<0.01)。在苏木素-伊红(HE)、马松(Masson)染色、免疫荧光及电镜下观察可见模型组大鼠肾组织病理损伤明显,贝那普利和丹参多酚酸盐治疗后,肾组织细胞的病理损伤逐渐改善。与正常组比较,模型组大鼠肾脏p-AMPK/AMPK、p-Sirt1/Sirt1、PGC-1α、Bcl-2、Beclin-1、LC3Ⅱ�
文摘Background Prenatal hyperglycaemia may increase metabolic syndrome susceptibility of the offspring. An underlying component of the development of these morbidities is hepatic gluconeogenic molecular dysfunction. We hypothesized that maternal hyperglycaemia will influence her offsprings hepatic peroxisome proliferator-activated receptor coactivator-la （PGC-la） expression, a key regulator of glucose production in hepatocytes. Method We established maternal hyperglycaemia by streptozotocin injection to induce the maternal hyperglycaemic Wistar rat model. Offspring from the severe hyperglycemia group （SDO） and control group （CO） were monitored until 180 days after birth. Blood pressure, lipid metabolism indicators and insulin resistance （IR） were measured. Hepatic PGC-la expression was analyzed by reverse transcription polymerase chain reaction and Western blotting, mRNA expression of two key enzymes in gluconeogenesis, glucose-6-phospha-tase （G-6-Pase） and phosphoenolpyruvate carboxykinase （PEPCK）, were analyzed and compared. Results In the SDO group, PGC-la expression at protein and mRNA levels were increased, so were expression of G-6-Pase and PEPCK （P〈0.05）. The above effects were seen prior to the onset of IR. Conclusion The hepatic gluconeogenic molecular dysfunction may contribute to the metabolic morbidities experienced by this population.
基金This work was supported by grants from the National I Natural Science Foundation of China （No. 20971063） and doctoral scientific research funds （No. 318051315）.
文摘INTRODUCTIONAccording to the demographics, the world population over 60 years will double from 605 million to 2 billion people between 2000 and 2050. Aging is a complex process in which the organism and its ability to respond to external stresses become progressive decline.
