Activation of AMPK by bitter melon triterpenoids involves CaMKKβ.

Activation of AMPK by bitter melon triterpenoids involves CaMKKβ.
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DOI:
10.1371/journal.pone.0062309
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发表时间:
2013
期刊:
影响因子:
3.7
通讯作者:
Ye JM
Ye JM
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Iseli TJ;Turner N;Zeng XY;Cooney GJ;Kraegen EW;Yao S;Ye Y;James DE;Ye JM

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我们最近发现苦瓜衍生的三萜类化合物(BMTs)在体外激活AMPK并增加GLUT 4向质膜的转运,并在体内改善胰岛素抵抗模型中的葡萄糖处理。在这里,我们询问了这些新化合物激活AMPK(一种主要的抗糖尿病药物靶点)的机制。BMT不像AMP或Abbott化合物(A-769662)那样以变构方式直接激活AMPK,也不像许多常用的抗糖尿病药物那样通过抑制细胞呼吸来激活AMPK。BMT使L 6肌管和LKB 1缺陷型HeLa细胞中的AMPK活性增加20- 35%。与CaMKKβ抑制剂STO-609一起孵育完全减弱了这种作用,表明CaMKKβ在这种激活中起关键作用。用钙螯合剂EGTA-AM孵育L 6肌管并没有改变这种激活,这表明BMT依赖性激活是不依赖于Ca 2+的。因此,我们认为CaMKKβ是BMT诱导AMPK活化的关键上游激酶。
We recently showed that bitter melon-derived triterpenoids (BMTs) activate AMPK and increase GLUT4 translocation to the plasma membrane in vitro, and improve glucose disposal in insulin resistant models in vivo. Here we interrogated the mechanism by which these novel compounds activate AMPK, a leading anti-diabetic drug target. BMTs did not activate AMPK directly in an allosteric manner as AMP or the Abbott compound (A-769662) does, nor did they activate AMPK by inhibiting cellular respiration like many commonly used anti-diabetic medications. BMTs increased AMPK activity in both L6 myotubes and LKB1-deficient HeLa cells by 20–35%. Incubation with the CaMKKβ inhibitor, STO-609, completely attenuated this effect suggesting a key role for CaMKKβ in this activation. Incubation of L6 myotubes with the calcium chelator EGTA-AM did not alter this activation suggesting that the BMT-dependent activation was Ca2+-independent. We therefore propose that CaMKKβ is a key upstream kinase for BMT-induced activation of AMPK.
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