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黄芩苷和野黄芩苷对 AMPK 和 Akt 的差异化调节促进脂肪细胞葡萄糖摄取。

Differential regulation of baicalin and scutellarin on AMPK and Akt in promoting adipose cell glucose disposal.

机构信息

State Key Laboratory of Natural Medicines, China Pharmaceutical University, No. 24 Tongjia Lane, Nanjing 210009, China.

State Key Laboratory of Precision Spectroscopy, East China Normal University, No. 3663 North Zhongshan Road, Shanghai 200062, China.

出版信息

Biochim Biophys Acta Mol Basis Dis. 2017 Feb;1863(2):598-606. doi: 10.1016/j.bbadis.2016.11.024. Epub 2016 Nov 27.

Abstract

Baicalin and scutellarin, two flavonoid glucuronic acids isolated from Scutellaria baicalensis, exhibit beneficial effects on glucose homeostasis. Baicalin and scutellarin are similar in structure except scutellarin has an additional hydroxyl at composition C-4'. In this work, we observed that baicalin and scutellarin promoted glucose disposal in mice and in adipocytes. Baicalin selectively increased phosphorylation of AMP-activated kinase (AMPK), while scutellarin selectively enhanced Akt phosphorylation. Both of them increased AS160 phosphorylation and glucose uptake in basal condition. AMPK inhibitor or knockdown of AMPK by siRNA blocked baicalin-induced AS160 phosphorylation and glucose uptake, but showed no effects on scutellarin. In contrast, Akt inhibitor and knockdown of Akt with siRNA decreased scutellarin-stimulated glucose uptake but had no effects on baicalin. The molecular dynamic simulations analysis showed that the binding energy of baicalin to AMPK (-34.30kcal/mol) was more favorable than scutellarin (-21.27kcal/mol), while the binding energy of scutellarin (-29.81kcal/mol) to Akt was much more favorable than baicalin (4.04kcal/mol). Interestingly, a combined treatment with baicalin and scutellarin acted synergistically to enhance glucose uptake in adipocytes (combination index: 0.94-0.046). In conclusion, baicalin and scutellarin, though structurally similar, promoted glucose disposal in adipocytes by differential regulation on AMPK and Akt activity. Our data provide insight that multicomponent herbal medicines may act synergistically on multiple targets.

摘要

黄芩苷和野黄芩苷是从黄芩中分离得到的两种黄酮类葡萄糖醛酸,它们对葡萄糖稳态具有有益作用。黄芩苷和野黄芩苷在结构上相似,只是野黄芩苷在 C-4'位上有一个额外的羟基。在这项工作中,我们观察到黄芩苷和野黄芩苷能促进小鼠和脂肪细胞中的葡萄糖摄取。黄芩苷选择性地增加 AMP 激活的蛋白激酶(AMPK)的磷酸化,而野黄芩苷则选择性地增强 Akt 的磷酸化。它们都能增加 AS160 的磷酸化和基础状态下的葡萄糖摄取。AMPK 抑制剂或 siRNA 敲低 AMPK 阻断了黄芩苷诱导的 AS160 磷酸化和葡萄糖摄取,但对野黄芩苷没有影响。相反,Akt 抑制剂和 siRNA 敲低 Akt 降低了野黄芩苷刺激的葡萄糖摄取,但对黄芩苷没有影响。分子动力学模拟分析表明,黄芩苷与 AMPK 的结合能(-34.30kcal/mol)比野黄芩苷(-21.27kcal/mol)更有利,而野黄芩苷与 Akt 的结合能(-29.81kcal/mol)比黄芩苷(4.04kcal/mol)更有利。有趣的是,黄芩苷和野黄芩苷联合处理协同增强脂肪细胞中的葡萄糖摄取(组合指数:0.94-0.046)。总之,黄芩苷和野黄芩苷虽然结构相似,但通过对 AMPK 和 Akt 活性的不同调节,促进了脂肪细胞中的葡萄糖摄取。我们的数据提供了一个见解,即多成分草药可能通过作用于多个靶点而协同发挥作用。

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