Background Some single nucleotide polymorphisms （SNPs） in the peroxisome proliferator-activated receptor-y coactivator （PGC）-1α gene have been reported to be associated with type 2 diabetes in different populatio...Background Some single nucleotide polymorphisms （SNPs） in the peroxisome proliferator-activated receptor-y coactivator （PGC）-1α gene have been reported to be associated with type 2 diabetes in different populations, and studies on Chinese patients yielded controversial results. The objective of this case-control study was to explore the relationship between SNPs of PGC-1α and type 2 diabetes in the southern Chinese population and to determine whether the common variants： Gly482Ser and Thr394Thr, in the PGC-1α gene have any impacts on interaction with myocyte enhancer factor （MEF） 2C. Methods The SNPs in all exons of the PGC-1α gene was investigated in 50 type 2 diabetic patients using polymerase chain reaction-single strand conformational polymorphism （PCR-SSCP） and direct sequencing. Thereafter, 263 type 2 diabetic patients and 282 healthy controls were genotyped by polymerase chain reaction-restriction fragment length polymorphism （PCR-RFLP）. A bacterial two-hybrid system and site-directed mutagenesis were used to investigate whether Gly482Ser and Thr394Thr variants in the PGC-1α gene alter the interaction with MEF2C. Results Three frequent SNPs （Thr394Thr, Gly482Ser and Thr528Thr） were found in exons of the PGC-1α gene. Only the Gly482Ser variant had a different distribution between diabetic patients and healthy subjects, with the 482Ser allele more frequent in patients than in controls （40.1% vs 29.3%, P〈0.01）. Even in controls, the 482Ser（A） carriers were more likely to have higher levels of total cholesterol and low-density lipoprotein cholesterol than the 482Gly（G） carriers. The 394A-482G-528A haplotype was associated with protection from diabetes, while the 394A-482A-528A was associated with the susceptibility to diabetes. The bacterial two-hybrid system and site-directed mutagenesis revealed that the 482Ser variant was less efficient than the 482Gly variant to interact with MEF2C, whereas the 394Thr （A） had a synergic effect on the interaction between 482Ser variant and MEF2C. Conclusions The results suggested that the 482Ser variant of PGC-1α conferred the susceptibility to type 2 diabetes in the southern Chinese population. The underlying mechanism may be attributable, at least in part, to the altered interaction between the different variants （Gly482Ser, Thr394Thr） in the PGC-1α gene and MEF2C.展开更多
目的探讨长链非编码RNA(lncRNA)TCONS_00016478通过调控过氧化物酶增殖物激活受体γ辅助激活因子1α(PGC-1α)/过氧化物酶增殖物激活受体γ(PPARγ)信号通路影响实验性房颤兔心房肌能量代谢重构的机制。方法采用高通量二代测序技术检测...目的探讨长链非编码RNA(lncRNA)TCONS_00016478通过调控过氧化物酶增殖物激活受体γ辅助激活因子1α(PGC-1α)/过氧化物酶增殖物激活受体γ(PPARγ)信号通路影响实验性房颤兔心房肌能量代谢重构的机制。方法采用高通量二代测序技术检测房颤兔/非房颤兔右心房组织差异性表达lncRNAs,成年新西兰白兔18只,体质量2.0～2.5 kg,雌雄不拘,随机分为假手术组(行开胸术但不注射病毒)、阴性对照慢病毒组(右心房注射阴性对照慢病毒)和TCONS_00016478沉默慢病毒组(右心房注射TCONS_00016478沉默慢病毒),每组6只。感染病毒前及感染1周后分别使用心脏电生理仪行程序电刺激,检测心房有效不应期(AERP)与房颤诱发性。感染病毒1周后处死动物,取心房肌组织,采用qRT-PCR法检测RNA的表达,采用Western blotting法检测蛋白质的表达,采用PAS染色法和油红O染色法分别检测糖原和脂滴沉积。结果与感染病毒前相比,感染病毒1周后,TCONS_00016478沉默慢病毒组AERP缩短(80.667±1.453 vs 71.750±2.411,t=3.168,P=0.034);假手术组(80.083±1.044 vs 79.333±0.333,t=0.684,P=0.531)与阴性对照慢病毒组(81.083±2.599 vs 80.000±2.646,t=0.022,P=0.983)手术前后AERP差异无统计学意义。TCONS_00016478沉默慢病毒组病毒感染1周后,3只诱发房颤,假手术组和阴性对照慢病毒组均未诱发房颤。假手术组、阴性对照慢病毒组及TCONS_00016478沉默慢病毒组心房肌TCONS_00016478(F=126.042,P<0.001)、PGC-1α(F=43.998,P<0.001)、PPARγ(F=417.863,P<0.001)、葡萄糖转运蛋白-4(GLUT4)(F=98.043,P<0.001)及碱棕榈酰转移酶-1(CPT1)(F=105.096,P<0.001)基因表达量均差异有统计学意义。与假手术组相比,TCONS_00016478沉默慢病毒组心房肌TCONS_00016478在基因水平表达量降低(P<0.001),与能量代谢相关的蛋白质PGC-1α、PPARγ、GLUT4、CPT1在基因水平表达量降低(P<0.001),蛋白质水平表达量亦下降,差异有统计学意义(P<0.001);生物信息学分析表明,lncRNA TCONS_00016478及其靶基因PGC-1α与心肌能量代谢密切相关。心房肌细胞糖原和脂滴异常沉积。结论 TCONS_00016478通过调控PGC-1α/PPARγ信号通路影响心房肌能量代谢重构,进而调控房颤发生。展开更多
文摘Background Some single nucleotide polymorphisms （SNPs） in the peroxisome proliferator-activated receptor-y coactivator （PGC）-1α gene have been reported to be associated with type 2 diabetes in different populations, and studies on Chinese patients yielded controversial results. The objective of this case-control study was to explore the relationship between SNPs of PGC-1α and type 2 diabetes in the southern Chinese population and to determine whether the common variants： Gly482Ser and Thr394Thr, in the PGC-1α gene have any impacts on interaction with myocyte enhancer factor （MEF） 2C. Methods The SNPs in all exons of the PGC-1α gene was investigated in 50 type 2 diabetic patients using polymerase chain reaction-single strand conformational polymorphism （PCR-SSCP） and direct sequencing. Thereafter, 263 type 2 diabetic patients and 282 healthy controls were genotyped by polymerase chain reaction-restriction fragment length polymorphism （PCR-RFLP）. A bacterial two-hybrid system and site-directed mutagenesis were used to investigate whether Gly482Ser and Thr394Thr variants in the PGC-1α gene alter the interaction with MEF2C. Results Three frequent SNPs （Thr394Thr, Gly482Ser and Thr528Thr） were found in exons of the PGC-1α gene. Only the Gly482Ser variant had a different distribution between diabetic patients and healthy subjects, with the 482Ser allele more frequent in patients than in controls （40.1% vs 29.3%, P〈0.01）. Even in controls, the 482Ser（A） carriers were more likely to have higher levels of total cholesterol and low-density lipoprotein cholesterol than the 482Gly（G） carriers. The 394A-482G-528A haplotype was associated with protection from diabetes, while the 394A-482A-528A was associated with the susceptibility to diabetes. The bacterial two-hybrid system and site-directed mutagenesis revealed that the 482Ser variant was less efficient than the 482Gly variant to interact with MEF2C, whereas the 394Thr （A） had a synergic effect on the interaction between 482Ser variant and MEF2C. Conclusions The results suggested that the 482Ser variant of PGC-1α conferred the susceptibility to type 2 diabetes in the southern Chinese population. The underlying mechanism may be attributable, at least in part, to the altered interaction between the different variants （Gly482Ser, Thr394Thr） in the PGC-1α gene and MEF2C.
文摘目的探讨长链非编码RNA(lncRNA)TCONS_00016478通过调控过氧化物酶增殖物激活受体γ辅助激活因子1α(PGC-1α)/过氧化物酶增殖物激活受体γ(PPARγ)信号通路影响实验性房颤兔心房肌能量代谢重构的机制。方法采用高通量二代测序技术检测房颤兔/非房颤兔右心房组织差异性表达lncRNAs,成年新西兰白兔18只,体质量2.0～2.5 kg,雌雄不拘,随机分为假手术组(行开胸术但不注射病毒)、阴性对照慢病毒组(右心房注射阴性对照慢病毒)和TCONS_00016478沉默慢病毒组(右心房注射TCONS_00016478沉默慢病毒),每组6只。感染病毒前及感染1周后分别使用心脏电生理仪行程序电刺激,检测心房有效不应期(AERP)与房颤诱发性。感染病毒1周后处死动物,取心房肌组织,采用qRT-PCR法检测RNA的表达,采用Western blotting法检测蛋白质的表达,采用PAS染色法和油红O染色法分别检测糖原和脂滴沉积。结果与感染病毒前相比,感染病毒1周后,TCONS_00016478沉默慢病毒组AERP缩短(80.667±1.453 vs 71.750±2.411,t=3.168,P=0.034);假手术组(80.083±1.044 vs 79.333±0.333,t=0.684,P=0.531)与阴性对照慢病毒组(81.083±2.599 vs 80.000±2.646,t=0.022,P=0.983)手术前后AERP差异无统计学意义。TCONS_00016478沉默慢病毒组病毒感染1周后,3只诱发房颤,假手术组和阴性对照慢病毒组均未诱发房颤。假手术组、阴性对照慢病毒组及TCONS_00016478沉默慢病毒组心房肌TCONS_00016478(F=126.042,P<0.001)、PGC-1α(F=43.998,P<0.001)、PPARγ(F=417.863,P<0.001)、葡萄糖转运蛋白-4(GLUT4)(F=98.043,P<0.001)及碱棕榈酰转移酶-1(CPT1)(F=105.096,P<0.001)基因表达量均差异有统计学意义。与假手术组相比,TCONS_00016478沉默慢病毒组心房肌TCONS_00016478在基因水平表达量降低(P<0.001),与能量代谢相关的蛋白质PGC-1α、PPARγ、GLUT4、CPT1在基因水平表达量降低(P<0.001),蛋白质水平表达量亦下降,差异有统计学意义(P<0.001);生物信息学分析表明,lncRNA TCONS_00016478及其靶基因PGC-1α与心肌能量代谢密切相关。心房肌细胞糖原和脂滴异常沉积。结论 TCONS_00016478通过调控PGC-1α/PPARγ信号通路影响心房肌能量代谢重构,进而调控房颤发生。
