Abrogation of Hyperosmotic Impairment of Insulin Signaling by a Novel Class of 1,2-Dithiole-3-thiones through the Inhibition of S6K1 Activation
作者:Eun Ju Bae、Yoon Mee Yang、Sang Geon Kim
DOI:10.1124/mol.107.044347
日期:2008.5
factor-alpha-induced hepatic insulin resistance via AMP-activated protein kinase-dependent p70S6 kinase (S6K) 1 inhibitory pathway. This study investigated whether oltipraz and a novel class of 1,2-dithiole-3-thiones were capable of preventing insulin resistance induced by hyperosmotic stress, thereby enhancing insulin-dependent signals, and, if so, whether the restoration of insulin signal was mediated
来自该实验室的先前研究表明,吡喹硫酮和合成的二硫代硫酮通过AMP激活的蛋白激酶依赖性p70S6激酶(S6K)1抑制途径预防肿瘤坏死因子-α诱导的肝胰岛素抵抗。这项研究调查了oltipraz和一类新型的1,2-二硫代3-硫酮是否能够预防高渗应激诱导的胰岛素抵抗,从而增强胰岛素依赖性信号,如果可以,是否介导了胰岛素信号的恢复抑制高渗应激刺激的S6K1活性。在HepG2细胞中,oltipraz处理抑制了胰岛素受体底物(IRS)1丝氨酸磷酸化,这是山梨糖醇,甘露醇或氯化钠诱导的高渗应激诱导的胰岛素抵抗的标志。所以,这可以使细胞恢复胰岛素信号,这可以通过IRS1的丝氨酸与酪氨酸磷酸化比率的降低以及Akt和糖原合酶激酶(GSK)3beta磷酸化的增加来证明。高渗胁迫明显激活了S6K1;oltipraz预处理完全消除了S6K1激活。使用显性阴性S6K1的实验支持S6K1在高渗透压刺激的IRS1磷酸化