Oxidative stress induces GLUT4 translocation by activation of PI3-K/Akt and dual AMPK kinase in cardiac myocytes.

Abstract:

:In response to metabolic stress, GLUT4, the most abundant glucose transporter, translocates from intracellular vesicles to the plasma membrane. This appears to play an important role in protecting cardiac myocytes from ischemic injury. To investigate the precise mechanisms of GLUT4 translocation in cardiomyocytes, we have established a method for quantifying the relative proportion of sarcolemmal GLUT4 to total GLUT4 in these cells. Stimulation with H2O2 resulted in a concentration-dependent increase in GLUT4 translocation, which peaked at 15 min after stimulation. The dominant-negative form (DN) of AMP-activated protein kinase (AMPK) alpha2 inhibited the H2O2-induced translocation of GLUT4. We further examined the role of two known AMPK kinases (AMPKKs), calmodulin-dependent protein kinase kinase (CaMKK)beta and LKB1. The DN of CaMKKbeta or LKB1 alone inhibited H2O2-induced GLUT4 translocation only partially compared to the inhibition produced by the DN of AMPKalpha2. However, the combination of DN-LKB1 and DN-CaMKKbeta inhibited translocation to an extent similar to with DN-AMPKalpha2. Stimulation with H2O2 also activated Akt and the inhibition of PI3-K/Akt prevented GLUT4 translocation to the same extent as with AMPK inhibition. When the DN of AMPKalpha2 was applied with DN-PI3-K, there was a complete reduction in the GLUT4 membrane level similar to that seen at the 0 time-point. These results demonstrate that AMPK and PI3-K/Akt have an additive effect on oxidative stress-mediated GLUT4 translocation.

journal_name

J Cell Physiol

authors

Horie T,Ono K,Nagao K,Nishi H,Kinoshita M,Kawamura T,Wada H,Shimatsu A,Kita T,Hasegawa K

doi

10.1002/jcp.21353

subject

Has Abstract

pub_date

2008-06-01 00:00:00

pages

733-42

issue

3

eissn

0021-9541

issn

1097-4652

journal_volume

215

pub_type

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