Objective： To investigate the expressions of GSK-3beta, Beta-catenin and PPAR-gamma, and their relationship in medulloblastoma, and to explore their value in clinic application. Methods： Immunohistochemical stainin...Objective： To investigate the expressions of GSK-3beta, Beta-catenin and PPAR-gamma, and their relationship in medulloblastoma, and to explore their value in clinic application. Methods： Immunohistochemical staining with SP method was conducted to determine the expressions of GSK-3beta, Beta-catenin and PPAR-gamma in 48 cases of medulloblastoma and 10 normal cerebellar tissues. Results： The rate of abnormal expressions of beta-catenin and PPAR-gamma in MB was higher than that in normal. Conversely, GSK-3beta in MB was lower than that in the normal （P〈0.05）. Furthermore, in medulloblastoma, beta-catenin and GSK-3beta showed a negative correlation, PPAR-gamma and beta-catenin had a positive correlation. Conclusion： Abnormal expression of beta-catenin plays a crucial role in the development of medulloblastoma. Meanwhile, PPAR-gamma and GSK-3beta which are tightly related with beta-catenin are both involved in the genesis and development of medulloblastoma.展开更多
Perilipin1(PLIN1)is a major phosphorylated protein that specifically coats the surface of neutral lipid droplets(LDs)in adipocytes and plays a crucial role in regulating the accumulation and hydrolysis of triacylglyce...Perilipin1(PLIN1)is a major phosphorylated protein that specifically coats the surface of neutral lipid droplets(LDs)in adipocytes and plays a crucial role in regulating the accumulation and hydrolysis of triacylglycerol(TG).Mammalian studies have shown that Plin1 gene transcription is mainly regulated by peroxisome proliferator-activated receptorgamma(PPARγ),the master regulator of adipogenesis.However,the regulatory mechanism of the chicken Plin1(c Plin1)gene is poorly understood.The present study aimed to investigate whether Plin1 is regulated by PPARγin chickens and identify its exact molecular mechanism.Reporter gene and expression assays showed that PPARγ2,but not PPARγ1,activated(P<0.01)the cPlin1 gene promoter.An electrophoretic mobility shift assay and mutational analysis revealed that PPARγ2 bound to a special site in the cPlin1 gene promoter to enhance its expression.In summary,our results show that PPARγpromotes the expression of the cPlin1 gene and that PPARγ2 is the main regulatory isoform.展开更多
目的检测过氧化物酶体增殖激活性受体γ(PPARγ)在肝癌组织中有无差异性表达且有无突变。方法用半定量RT- PCR,Western blot,FISH,PCR-SSCP等方法进行鉴定。结果用半定量RT-PCR检测,有8/14为癌中高表达;Western blot 方法检测,9/15为癌...目的检测过氧化物酶体增殖激活性受体γ(PPARγ)在肝癌组织中有无差异性表达且有无突变。方法用半定量RT- PCR,Western blot,FISH,PCR-SSCP等方法进行鉴定。结果用半定量RT-PCR检测,有8/14为癌中高表达;Western blot 方法检测,9/15为癌中高表达。免疫组化显示PPARγ在所有的癌旁组织中定位于细胞浆中;而在5个癌组织中定位于细胞核中;突变热点PPARγ外显子3和5在34对肝癌标本中没有突变。结论过氧化物酶体增殖激活性受体γ在肝癌组织中有差异性表达并且在肝癌标本中没有突变。提示PPARγ可能与肝癌的发展有一定的相关性。展开更多
目的探讨PPARγ上调miR-16的机制及其抑制脓毒症炎症反应的作用。方法经Real time RT-PCR检测脓毒症患者和健康者的外周血单核细胞PPARγ和miR-16的表达,分析其相关性;分别用PPARγ激动剂RGZ、PPARγsiRNA或miR-16抑制剂(antagomir-16)...目的探讨PPARγ上调miR-16的机制及其抑制脓毒症炎症反应的作用。方法经Real time RT-PCR检测脓毒症患者和健康者的外周血单核细胞PPARγ和miR-16的表达,分析其相关性;分别用PPARγ激动剂RGZ、PPARγsiRNA或miR-16抑制剂(antagomir-16)处理THP-1和RAW246.7,经real time RT-PCR和Western blot检测miR-16及其靶基因IKKα的表达;细胞转染含miR-16启动子的报告基因质粒,经PPARγ激动剂RGZ或拮抗剂GW9662处理后,检测细胞报告基因活性;细胞经PPARγ激动剂RGZ处理,再经LPS处理,ELISA检测炎症因子TNFα和IL-6的表达;LPS诱导的脓毒症小鼠经PPARγ激动剂RGZ,或经antagomir-16预处理后,再经PPARγ激动剂RGZ处理小鼠,real time RT-PCR检测小鼠外周血单核细胞中miR-16的表达,ELISA检测血清炎症因子TNFα和IL-6的表达。结果脓毒症患者外周血单核细胞中PPARγ与miR-16的表达均降低且二者的表达呈显著负相关(P<0.05);PPARγ通过促进miR-16的启动子活性上调miR-16的表达,进而抑制miR-16靶分子IKKα的表达(P<0.05);PPARγ上调miR-16后显著抑制炎症细胞产生TNFα和IL-6(P<0.05);PPARγ上调miR-16抑制脓毒症小鼠血清TNFα和IL-6的表达(P<0.05)。结论激动剂活化的PPARγ上调miR-16进而抑制细胞炎症因子表达及脓毒症小鼠炎症反应。展开更多
文摘Objective： To investigate the expressions of GSK-3beta, Beta-catenin and PPAR-gamma, and their relationship in medulloblastoma, and to explore their value in clinic application. Methods： Immunohistochemical staining with SP method was conducted to determine the expressions of GSK-3beta, Beta-catenin and PPAR-gamma in 48 cases of medulloblastoma and 10 normal cerebellar tissues. Results： The rate of abnormal expressions of beta-catenin and PPAR-gamma in MB was higher than that in normal. Conversely, GSK-3beta in MB was lower than that in the normal （P〈0.05）. Furthermore, in medulloblastoma, beta-catenin and GSK-3beta showed a negative correlation, PPAR-gamma and beta-catenin had a positive correlation. Conclusion： Abnormal expression of beta-catenin plays a crucial role in the development of medulloblastoma. Meanwhile, PPAR-gamma and GSK-3beta which are tightly related with beta-catenin are both involved in the genesis and development of medulloblastoma.
基金supported by the National Natural Science Foundation of China(31201796 and 32072704)the China Agriculture Research System of MOF and MARA(CARS-41)the Natural Science Foundation of Heilongjiang Province,China(LH2020C017)。
文摘Perilipin1(PLIN1)is a major phosphorylated protein that specifically coats the surface of neutral lipid droplets(LDs)in adipocytes and plays a crucial role in regulating the accumulation and hydrolysis of triacylglycerol(TG).Mammalian studies have shown that Plin1 gene transcription is mainly regulated by peroxisome proliferator-activated receptorgamma(PPARγ),the master regulator of adipogenesis.However,the regulatory mechanism of the chicken Plin1(c Plin1)gene is poorly understood.The present study aimed to investigate whether Plin1 is regulated by PPARγin chickens and identify its exact molecular mechanism.Reporter gene and expression assays showed that PPARγ2,but not PPARγ1,activated(P<0.01)the cPlin1 gene promoter.An electrophoretic mobility shift assay and mutational analysis revealed that PPARγ2 bound to a special site in the cPlin1 gene promoter to enhance its expression.In summary,our results show that PPARγpromotes the expression of the cPlin1 gene and that PPARγ2 is the main regulatory isoform.
文摘目的检测过氧化物酶体增殖激活性受体γ(PPARγ)在肝癌组织中有无差异性表达且有无突变。方法用半定量RT- PCR,Western blot,FISH,PCR-SSCP等方法进行鉴定。结果用半定量RT-PCR检测,有8/14为癌中高表达;Western blot 方法检测,9/15为癌中高表达。免疫组化显示PPARγ在所有的癌旁组织中定位于细胞浆中;而在5个癌组织中定位于细胞核中;突变热点PPARγ外显子3和5在34对肝癌标本中没有突变。结论过氧化物酶体增殖激活性受体γ在肝癌组织中有差异性表达并且在肝癌标本中没有突变。提示PPARγ可能与肝癌的发展有一定的相关性。
文摘目的探讨PPARγ上调miR-16的机制及其抑制脓毒症炎症反应的作用。方法经Real time RT-PCR检测脓毒症患者和健康者的外周血单核细胞PPARγ和miR-16的表达,分析其相关性;分别用PPARγ激动剂RGZ、PPARγsiRNA或miR-16抑制剂(antagomir-16)处理THP-1和RAW246.7,经real time RT-PCR和Western blot检测miR-16及其靶基因IKKα的表达;细胞转染含miR-16启动子的报告基因质粒,经PPARγ激动剂RGZ或拮抗剂GW9662处理后,检测细胞报告基因活性;细胞经PPARγ激动剂RGZ处理,再经LPS处理,ELISA检测炎症因子TNFα和IL-6的表达;LPS诱导的脓毒症小鼠经PPARγ激动剂RGZ,或经antagomir-16预处理后,再经PPARγ激动剂RGZ处理小鼠,real time RT-PCR检测小鼠外周血单核细胞中miR-16的表达,ELISA检测血清炎症因子TNFα和IL-6的表达。结果脓毒症患者外周血单核细胞中PPARγ与miR-16的表达均降低且二者的表达呈显著负相关(P<0.05);PPARγ通过促进miR-16的启动子活性上调miR-16的表达,进而抑制miR-16靶分子IKKα的表达(P<0.05);PPARγ上调miR-16后显著抑制炎症细胞产生TNFα和IL-6(P<0.05);PPARγ上调miR-16抑制脓毒症小鼠血清TNFα和IL-6的表达(P<0.05)。结论激动剂活化的PPARγ上调miR-16进而抑制细胞炎症因子表达及脓毒症小鼠炎症反应。
文摘[目的]观察三七皂苷(Panax notoginseng saponin,PNS)对激素耐药狼疮肾炎(lupus nephritis,LN)小鼠脾淋巴细胞过氧化物酶增殖体活化受体γ(peroxidase proliferator activated receptor gamma,PPARγ)、沉默信息调节因子相关酶1(silent information regulation factor related enzyme 1,SIRT1)和三磷酸腺苷结合盒转运体A1(adenosine triphosphate binding cassette transporter A1,ABCA1)表达的影响,探索PNS改善激素耐药和脂代谢紊乱的双重作用,为运用活血化瘀中药提高难治性LN临床疗效提供科学依据。[方法]采用密度梯度法分离NZB/WF1小鼠的脾淋巴细胞,用小剂量甲基强的松龙诱导细胞产生激素耐药,将诱导后的细胞分为模型组、PPARγ质粒转染组、PPARγsi RNA+PNS组和PNS组,并以未诱导耐药的NZB/WF1小鼠脾淋巴细胞作为对照组,各组细胞培养72h后以Real-time PCR检测各组淋巴细胞PPARγ和SIRT1 m RNA表达,Western blot检测PPARγ和SIRT1蛋白表达,荧光分光光度法检测细胞内胆固醇酯含量,流式细胞术检测ABCA1蛋白表达。[结果](1)上调PPARγ能抑制SIRT1高表达,模型组PPARγm RNA和蛋白表达水平均低于对照组,SIRT1 m RNA和蛋白表达水平均高于对照组(P<0.05);通过质粒转染上调PPARγ水平后,PPARγ质粒转染组的SIRT1 m RNA和蛋白表达水平均低于模型组(P<0.05);(2)PNS组PPARγ表达高于模型组,SIRT1表达则减低(P<0.05)。尽管PNS组PPARγm RNA表达水平低于PPARγ质粒转染组,但两组SIRT1 m RNA表达水平无统计学差异(P>0.05);与模型组比较,PPARγsi RNA+PNS组的SIRT1 m RNA和蛋白表达水平均下降(P<0.05)。(3)PNS具有调节细胞内脂代谢紊乱作用,模型组细胞内胆固醇酯含量低于对照组(P<0.05);PNS组细胞内胆固醇酯含量高于对照组,ABCA1蛋白表达则低于对照组(P<0.05)。[结论](1)激素耐药的LN小鼠脾淋巴细胞内存在脂代谢紊乱。(2)PNS具有逆转激素耐药和调节细胞内脂代谢紊乱的双重效应。
