Tumor necrosis factor- (cid:1) directly stimulates the overproduction of hepatic apolipoprotein B100-containing VLDL via impairment of hepatic insulin signaling

Tumor necrosis factor- (cid:1) directly stimulates the overproduction of hepatic apolipoprotein B100-containing VLDL via impairment of hepatic insulin signaling
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肿瘤坏死因子- (cid:1) 通过损害肝脏胰岛素信号传导直接刺激含载脂蛋白 B100 的肝载脂蛋白 B100 的过量产生

DOI:
10.1152/ajpgi.00407.2007
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发表时间:
2008
期刊:
影响因子:
4.5
通讯作者:
Khosrow Adeli
Khosrow Adeli
中科院分区:
医学3区
文献类型:
--
作者:
B. Qin;Richard A. Anderson;Khosrow Adeli

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秦K。肿瘤坏死因子-(cid:1)通过损伤肝脏胰岛素信号直接刺激含有载脂蛋白B100的VLDL的过量产生。Am J Physiol doi:10.1152/ajpgi.00407.2007.-胰岛素抵抗状态通常与肿瘤坏死因子(TNF)-(cid:1)的循环水平增加和极低密度脂蛋白(VLDL)的肝脏过度产生两者相关。在这里,我们提供的证据表明,增加TNF-(cid:1)可以直接刺激肝脏装配和分泌载脂蛋白B(apoB)100-含有VLDL 1,使用叙利亚金黄地鼠,一种动物模型,非常类似于人类的肝脏VLDL-apoB 100代谢。在正常血糖高胰岛素钳夹研究的基础上,在体内向喂食仓鼠的4小时内输注TNF-(cid:1)诱导全身胰岛素抵抗。TNF-(cid:1)处理仓鼠肝脏的免疫沉淀和免疫印迹分析表明胰岛素受体(IR)-(cid:2)、IR底物-1(Tyr)、Akt(Ser 473)、p38、ERK 1/2和JNK的酪氨酸磷酸化降低,但IRS-1(Ser 307)和Shc的丝氨酸磷酸化增加。TNF-(cid:1)输注还显著增加了空腹和餐后(脂肪负荷)状态下总循环apoB 100和VLDL-apoB 100的肝脏生成。使用培养的仓鼠原代肝细胞进行的离体实验也显示TNF-(cid:1)诱导的VLDL-apoB 100过度分泌,该作用可被TNF受体2抗体阻断。出乎意料的是,TNF-(cid:1)降低了原代肝细胞中固醇调节元件结合蛋白-1c的质量和mRNA水平,但显著增加了微粒体甘油三酯转移蛋白的质量和mRNA水平。总之,这些数据提供了直接证据,表明TNF-(cid:1)诱导全身胰岛素抵抗并损害肝脏胰岛素信号传导,伴随着含apoB 100的VLDL颗粒的过度产生,这种作用可能通过TNF受体2介导。跨体甘油三酯转移蛋白(MTP)引物,5(cid:6)-GTCAG-GAAGCTGTGTCAGAATG-3(cid:6)和5(cid:6)-CTCCTTTTTCTCTGCC-TTTTCA-3(cid:6);和18 S引物,5(cid:6)-TAAGTCCCTGCCC TTTG TA-CACA-3(cid:6)和5(cid:6)-GATCCGAGGGCCTCACTAAAC-3(cid:6)。
Qin K. Tumor necrosis factor- (cid:1) directly stimulates the overproduction of hepatic apolipoprotein B100-con-taining VLDL via impairment of hepatic insulin signaling. Am J Physiol doi:10.1152/ajpgi.00407.2007.—Insulin-resistant states are commonly associated with both increased circulating levels of tumor necrosis factor (TNF)- (cid:1) and hepatic overproduction of very low density lipoproteins (VLDL). Here, we provide evidence that increased TNF- (cid:1) can directly stimulate the hepatic assembly and secretion of apolipoprotein B (apoB) 100-containing VLDL 1 , using the Syrian golden hamster, an animal model that closely resembles humans in hepatic VLDL-apoB100 metabolism. In vivo TNF- (cid:1) infusion fo r 4 h inchow-fed hamsters induced whole-body insulin resistance on the basis of euglycemic hyperinsulinemic clamp studies. Immunoprecipitation and immunoblotting analysis of livers from TNF- (cid:1) -treated hamsters indicated decreased tyrosine phosphorylation of insulin receptor (IR)- (cid:2) , IR substrate-1 (Tyr), Akt (Ser 473 ), p38, ERK1/2, and JNK but increased serine phosphorylation of IRS-1 (Ser 307 ) and Shc. TNF- (cid:1) infusion also significantly increased hepatic production of total circulating apoB100 and VLDL-apoB100 in both fasting and postprandial (fat load) states. Ex vivo experiments, using cultured primary hepatocytes from hamsters, also showed TNF- (cid:1) -induced VLDL-apoB100 oversecretion, an effect that was blocked by TNF receptor 2 antibody. Unexpectedly, TNF- (cid:1) decreased the sterol regulatory element-binding protein-1c mass and mRNA levels but significantly increased microsomal triglyceride transfer protein mass and mRNA levels in primary hepatocytes. In summary, these data provide direct evidence that TNF- (cid:1) induces whole-body insulin resistance and impairs hepatic insulin signaling accompanied by overproduction of apoB100-containing VLDL particles, an effect likely mediated via TNF receptor 2. crosomal triglyceride transfer protein (MTP) primers, 5 (cid:6) -GTCAG-GAAGCTGTGTCAGAATG-3 (cid:6) and 5 (cid:6) - CTCCTTTTTCTCTGGC-TTTTCA-3 (cid:6) ; and 18S primers, 5 (cid:6) -TAAGTCCCTGCCC TTTG TA-CACA-3 (cid:6) and 5 (cid:6) -GATCCGAGGGCCTCACTAAAC-3 (cid:6) .
完整细胞中渥曼青霉素对胰岛素刺激的 IRS-1 和 SHC 酪氨酸磷酸化的差异调节。
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