Objective:To observe the effects of puerarin on the expressions of leptin receptor mRNA and phosphorylated Janus kinase 2 / phosphorylated signal transducers and activators of transcription 3 (P-JAK2/P-STAT3) proteins...Objective:To observe the effects of puerarin on the expressions of leptin receptor mRNA and phosphorylated Janus kinase 2 / phosphorylated signal transducers and activators of transcription 3 (P-JAK2/P-STAT3) proteins in the liver of rats with non-alcoholic fatty liver (NAFLD). Methods: A rat model of NAFLD was successfully established by feeding high-fat diet. All SD rats were randomly divided into blank control group, untreated group, simvastatin-treated group and puerarin-treated group. After four-week treatment, the levels of hepatic triglyceride and total cholesterol were analyzed by using an automatic biochemical analyzer. The pathology of the liver tissue was observed by light microscopy. Serum leptin level was detected by enzyme-linked immunosorbent assay, and the expressions of leptin receptor mRNA and P-JAK2/P-STAT3 proteins in the liver of NAFLD rats were quantified by reverse transcription polymerase chain reaction (RT-PCR) and Western blot analysis respectively. Results: Puerarin significantly decreased the levels of hepatic triglyceride and total cholesterol in NAFLD rats. Fat degeneration and inflammatory reaction in liver tissues of NAFLD rats were ameliorated after puerarin treatment. The serum leptin level was increased and the expressions of leptin receptor mRNA and P-JAK2/P-STAT3 proteins were up-regulated in puerarin-treated group. Conclusion: Puerarin can effectively attenuate liver lipid disorder and inflammation by improving the leptin resistance and enhancing the expressions of leptin receptor mRNA and P-JAK2/P-STAT3展开更多
目的研究寻常型银屑病皮损中磷酸化信号转导和转录激活因子-3(phosphorylated signal transducer and acti-vator of transcription-3,P-Stat3)与白介素-17(Interleukin-17,IL-17)的表达及意义。方法实验组23例,对照组14例。两组均采用...目的研究寻常型银屑病皮损中磷酸化信号转导和转录激活因子-3(phosphorylated signal transducer and acti-vator of transcription-3,P-Stat3)与白介素-17(Interleukin-17,IL-17)的表达及意义。方法实验组23例,对照组14例。两组均采用免疫组织化学法检测寻常型银屑病皮损组织和正常皮肤组织中P-Stat3与IL-17的表达。结果实验组银屑病皮损中P-Stat3和IL-17均高于对照组(Z值分别为-5.043和-4.324,均P<0.01),并且与PASI评分呈正相关(分别为rs=0.713和rs=0.797,均P<0.001),P-Stat3和IL-17呈正相关(rs=0.762,P<0.001)。结论 P-Stat3和IL-17在银屑病皮损中明显升高,且与疾病的严重程度呈正相关。展开更多
文摘Objective:To observe the effects of puerarin on the expressions of leptin receptor mRNA and phosphorylated Janus kinase 2 / phosphorylated signal transducers and activators of transcription 3 (P-JAK2/P-STAT3) proteins in the liver of rats with non-alcoholic fatty liver (NAFLD). Methods: A rat model of NAFLD was successfully established by feeding high-fat diet. All SD rats were randomly divided into blank control group, untreated group, simvastatin-treated group and puerarin-treated group. After four-week treatment, the levels of hepatic triglyceride and total cholesterol were analyzed by using an automatic biochemical analyzer. The pathology of the liver tissue was observed by light microscopy. Serum leptin level was detected by enzyme-linked immunosorbent assay, and the expressions of leptin receptor mRNA and P-JAK2/P-STAT3 proteins in the liver of NAFLD rats were quantified by reverse transcription polymerase chain reaction (RT-PCR) and Western blot analysis respectively. Results: Puerarin significantly decreased the levels of hepatic triglyceride and total cholesterol in NAFLD rats. Fat degeneration and inflammatory reaction in liver tissues of NAFLD rats were ameliorated after puerarin treatment. The serum leptin level was increased and the expressions of leptin receptor mRNA and P-JAK2/P-STAT3 proteins were up-regulated in puerarin-treated group. Conclusion: Puerarin can effectively attenuate liver lipid disorder and inflammation by improving the leptin resistance and enhancing the expressions of leptin receptor mRNA and P-JAK2/P-STAT3
文摘目的研究寻常型银屑病皮损中磷酸化信号转导和转录激活因子-3(phosphorylated signal transducer and acti-vator of transcription-3,P-Stat3)与白介素-17(Interleukin-17,IL-17)的表达及意义。方法实验组23例,对照组14例。两组均采用免疫组织化学法检测寻常型银屑病皮损组织和正常皮肤组织中P-Stat3与IL-17的表达。结果实验组银屑病皮损中P-Stat3和IL-17均高于对照组(Z值分别为-5.043和-4.324,均P<0.01),并且与PASI评分呈正相关(分别为rs=0.713和rs=0.797,均P<0.001),P-Stat3和IL-17呈正相关(rs=0.762,P<0.001)。结论 P-Stat3和IL-17在银屑病皮损中明显升高,且与疾病的严重程度呈正相关。
文摘目的观察信号转导及转录激活因子3(STAT3)磷酸化在树鼩脑缺血后适应(PC)神经保护中的作用,并探讨其可能机制。方法将50只健康成年树鼩随机分为对照组、脑缺血4 h组、脑缺血24 h组、后适应4 h组和后适应24 h组(每组n=5),其中10只动物做HE染色(n=5)及电子显微镜观察(n=5)。本实验通过光化学反应建立树鼩血栓性脑缺血模型;于缺血后4 h夹闭患侧颈总动脉3次(每次5 min)实施缺血PC。采用TTC染色观察树鼩脑梗死面积的变化,通过HE和电子显微镜观察脑皮质和海马组织学改变及其超微结构变化,应用Western blotting检测皮层总STAT3(t-STAT3)及磷酸化STAT3(p-STAT3)蛋白表达变化。结果脑缺血后皮层血管内皮细胞肿胀,皮层及海马神经元损伤,线粒体肿胀、嵴溶解,以缺血24 h损伤最为明显,脑梗死面积达到(24.78±2.06)%。而皮层p-STAT3蛋白表达随缺血时间延长呈增高趋势,缺血4 h p-STAT3蛋白表达明显增高(0.24±0.1,P<0.01),缺血24 h p-STAT3蛋白表达则持续增高(0.32±0.1,P<0.01)。缺血PC处理后皮层血管内皮细胞水肿好转,皮层及海马神经元损伤减轻,脑梗死面积减小为(17.67±1.90)%(P<0.01)。与缺血组相比,缺血PC 4 h p-STAT3蛋白表达进一步升高(0.41±0.09,P<0.01),缺血PC 24 h p-STAT3蛋白表达增高更加显著(0.70±0.11,P<0.01)。结论树鼩脑缺血可导致STAT3磷酸化代偿性增强,缺血PC的脑保护作用可能与其促进STAT3过磷酸化有关。
文摘主动脉瘤(aortic aneurysm,AA)是一种在中老年男性患者中常见的大血管疾病,在65岁以上男性患者中发病率高达9%。主要表现为各种原因导致的局部主动脉血管壁扩张或膨出,超过正常直径1.5倍以上[1]。动脉粥样硬化、感染、外伤等均有可能导致AA的发生发展,而血管平滑肌细胞(vascular smooth muscular cells,VSMC)凋亡、主动脉中膜退行性病变一直被认为是AA发生的主要病理标志[2]。信号转导和转录激活因子(signal transducer and activator of transcription,STAT)3作为一种常见的急性反应因子,在多种组织器官中表达,参与细胞增殖、凋亡、免疫调节等多种生物学过程[3]。近年研究表明,STAT3及其相关信号转导参与调控VSMC的增殖凋亡及表型转化,进而参与AA的发生发展,现就STAT3对AA调控机制以及STAT3抑制剂对AA疗效研究进展进行综述。
