目的:探讨肝核受体LXRs激动剂T0901317对正常人骨骼肌细胞中FAT/CD36基因mRNA表达的影响。方法:将原代培养的5例成人骨骼肌细胞分为用肝核受体LXRs激动剂T0901317(1μmol/L)作用组、T0901317(0.5μmol/L)作用组和阴性对照组,作用24h后采...目的:探讨肝核受体LXRs激动剂T0901317对正常人骨骼肌细胞中FAT/CD36基因mRNA表达的影响。方法:将原代培养的5例成人骨骼肌细胞分为用肝核受体LXRs激动剂T0901317(1μmol/L)作用组、T0901317(0.5μmol/L)作用组和阴性对照组,作用24h后采用SYBR Green I实时荧光定量PCR法检测各组成人骨骼肌细胞FAT/CD36基因mRNA表达水平,并用2-△△Ct方法进行比较分析。结果:①以浓度为1μmol/L的T0901317作用组和0.5μmol/L的T090131作用组和对照组样本的均数进行方差分析,差别有统计学意义(P<0.01)。②浓度为1μmol/L的T0901317作用组和0.5μmol/L的T090131作用组成人骨骼肌细胞中FAT/CD36基因的mRNA表达分别是对照组的3.03倍和2.91倍。结论:肝核受体LXRs激动剂T0901317能够提高成人骨骼肌细胞中FAT/CD36基因mRNA的表达水平,提示T0901317有加快骨骼肌细胞内脂肪酸的堆积作用,推测LXRs激动剂T0901317可能会增加糖尿病患者骨骼肌胰岛素抵抗的风险。展开更多
目的了解广州地区伊朗籍献血者CD36表型及基因型。方法对2016年在广州血液中心捐献机采血小板的53例伊朗人献血者标本,应用流式细胞仪分别检测血小板和单核细胞上CD36抗原的表达。对CD36抗原表达异常者提取DNA,采用PCR-SBT测序做CD36的...目的了解广州地区伊朗籍献血者CD36表型及基因型。方法对2016年在广州血液中心捐献机采血小板的53例伊朗人献血者标本,应用流式细胞仪分别检测血小板和单核细胞上CD36抗原的表达。对CD36抗原表达异常者提取DNA,采用PCR-SBT测序做CD36的基因型鉴定并做基因突变分析。结果本组伊朗人群的CD36抗原表达异常率7.55%(4/53),其中2例的CD36抗原在血小板上表达含量低,1例为血小板和单核细胞上均无表达(即CD36Ⅰ型缺失),1例为单核细胞上CD36表达量低,由此得出CD36缺失表达的频率为1.89%(1/53)。PCRSBT法分析:CD36抗原表达异常4例的CD36基因型中,血小板上低表达CD36抗原的2例发生基因突变,分别是exon 10-975T/G和exon11 del CTA,且均为新的基因突变;2例CD36基因型正常。结论本组伊朗献血人群里CD36抗原表达异常者中存在新的基因突变,其对CD36抗原表达的影响尚需进一步认证。展开更多
Background As an agonist of peroxisome proliferator-activated receptor-gamma （PPARy）, rosiglitazone can prevent acute fatty acid-induced insulin resistance in rats, however, the precise mechanisms by which rosiglita...Background As an agonist of peroxisome proliferator-activated receptor-gamma （PPARy）, rosiglitazone can prevent acute fatty acid-induced insulin resistance in rats, however, the precise mechanisms by which rosiglitazone alleviates insulin resistance induced by high-fat diet need to be further investigated.Methods Wistar rats aged 23-24 weeks were divided into three groups： （1） aged control group （OC）, （2） high-fat diet （HF） group and （3） high-fat diet plus rosiglitazone maleate tablets （HF＋Rosi） treatment group （n=20 in each group）. Insulin sensitivity was evaluated by conscious hyperinsulinemic-euglycemic clamp technique. mRNA levels of fatty acid translocase （FAT/CD36）, AMP-activated protein kinase α1 （AMPKα1）, AMPKα2 and acetyl CoA carboxylase （ACC） of rat skeletal muscle were determined using real-time PCR, while muscle camitine palmitoyltransferase-1 （CPT-1β） was determined using semi-quantitative PCR. Protein expression levels of FAT/CD36, AMPK phosphorylation （reflecting AMPK activity）, P-ACC （inversely related with ACC activity） and muscle CPT-1M in rat skeletal muscles were measured using Western blotting.Results Aged rats fed by diet rich in fat for more than 8 weeks led to significant increases of plasma lipids, skeletal muscle intramuscular triglyceride and long-chain fatty acyl-CoA （LCACoA） compared to aged rats fed by normal chow diet （OC） （P 〈0.05）, which might correlate with the lower （reduced by 42.4%） whole body insulin sensitivity in HF rats. FAT/CD36 protein concentrations and mRNA levels increased in untreated HF aged rats （P 〈0.01） and high-fat diet induced a significant decrease in P-AMPK, P-ACC, CPT-1M protein concentrations and AMPKα2 and CPT-1β mRNA levels in rat skeletal muscles （P 〈0.05）. No change in AMPKα1 mRNA levels was observed in the HF group.Conclusion High-fat diet in aged rats results in a lipid accumulation and subsequent insulin resistance, while rosiglitazone can alleviate the insulin resistance by reducing fatty acid uptake as well as enhancing lipometabolism.展开更多
文摘目的:探讨肝核受体LXRs激动剂T0901317对正常人骨骼肌细胞中FAT/CD36基因mRNA表达的影响。方法:将原代培养的5例成人骨骼肌细胞分为用肝核受体LXRs激动剂T0901317(1μmol/L)作用组、T0901317(0.5μmol/L)作用组和阴性对照组,作用24h后采用SYBR Green I实时荧光定量PCR法检测各组成人骨骼肌细胞FAT/CD36基因mRNA表达水平,并用2-△△Ct方法进行比较分析。结果:①以浓度为1μmol/L的T0901317作用组和0.5μmol/L的T090131作用组和对照组样本的均数进行方差分析,差别有统计学意义(P<0.01)。②浓度为1μmol/L的T0901317作用组和0.5μmol/L的T090131作用组成人骨骼肌细胞中FAT/CD36基因的mRNA表达分别是对照组的3.03倍和2.91倍。结论:肝核受体LXRs激动剂T0901317能够提高成人骨骼肌细胞中FAT/CD36基因mRNA的表达水平,提示T0901317有加快骨骼肌细胞内脂肪酸的堆积作用,推测LXRs激动剂T0901317可能会增加糖尿病患者骨骼肌胰岛素抵抗的风险。
文摘目的了解广州地区伊朗籍献血者CD36表型及基因型。方法对2016年在广州血液中心捐献机采血小板的53例伊朗人献血者标本,应用流式细胞仪分别检测血小板和单核细胞上CD36抗原的表达。对CD36抗原表达异常者提取DNA,采用PCR-SBT测序做CD36的基因型鉴定并做基因突变分析。结果本组伊朗人群的CD36抗原表达异常率7.55%(4/53),其中2例的CD36抗原在血小板上表达含量低,1例为血小板和单核细胞上均无表达(即CD36Ⅰ型缺失),1例为单核细胞上CD36表达量低,由此得出CD36缺失表达的频率为1.89%(1/53)。PCRSBT法分析:CD36抗原表达异常4例的CD36基因型中,血小板上低表达CD36抗原的2例发生基因突变,分别是exon 10-975T/G和exon11 del CTA,且均为新的基因突变;2例CD36基因型正常。结论本组伊朗献血人群里CD36抗原表达异常者中存在新的基因突变,其对CD36抗原表达的影响尚需进一步认证。
基金This work was supported by a grant from the Hebei Provincial Natural Science Foundation of China （No. 303552）.
文摘Background As an agonist of peroxisome proliferator-activated receptor-gamma （PPARy）, rosiglitazone can prevent acute fatty acid-induced insulin resistance in rats, however, the precise mechanisms by which rosiglitazone alleviates insulin resistance induced by high-fat diet need to be further investigated.Methods Wistar rats aged 23-24 weeks were divided into three groups： （1） aged control group （OC）, （2） high-fat diet （HF） group and （3） high-fat diet plus rosiglitazone maleate tablets （HF＋Rosi） treatment group （n=20 in each group）. Insulin sensitivity was evaluated by conscious hyperinsulinemic-euglycemic clamp technique. mRNA levels of fatty acid translocase （FAT/CD36）, AMP-activated protein kinase α1 （AMPKα1）, AMPKα2 and acetyl CoA carboxylase （ACC） of rat skeletal muscle were determined using real-time PCR, while muscle camitine palmitoyltransferase-1 （CPT-1β） was determined using semi-quantitative PCR. Protein expression levels of FAT/CD36, AMPK phosphorylation （reflecting AMPK activity）, P-ACC （inversely related with ACC activity） and muscle CPT-1M in rat skeletal muscles were measured using Western blotting.Results Aged rats fed by diet rich in fat for more than 8 weeks led to significant increases of plasma lipids, skeletal muscle intramuscular triglyceride and long-chain fatty acyl-CoA （LCACoA） compared to aged rats fed by normal chow diet （OC） （P 〈0.05）, which might correlate with the lower （reduced by 42.4%） whole body insulin sensitivity in HF rats. FAT/CD36 protein concentrations and mRNA levels increased in untreated HF aged rats （P 〈0.01） and high-fat diet induced a significant decrease in P-AMPK, P-ACC, CPT-1M protein concentrations and AMPKα2 and CPT-1β mRNA levels in rat skeletal muscles （P 〈0.05）. No change in AMPKα1 mRNA levels was observed in the HF group.Conclusion High-fat diet in aged rats results in a lipid accumulation and subsequent insulin resistance, while rosiglitazone can alleviate the insulin resistance by reducing fatty acid uptake as well as enhancing lipometabolism.
