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Increased Akt protein expression is associated with decreased ceramide content in skeletal muscle of troglitazone-treated mice.

Abstract：

:Although it is generally believed that thiazolidinediones ameliorate insulin resistance by lowering circulating free fatty acids, direct effects of these drugs in skeletal muscle may also contribute to their antidiabetic action. We report that troglitazone administration to mice for 1 day increased the protein expression of Akt (two-fold induction, P<0.001) in skeletal muscle without significant changes in the levels of free fatty acids in plasma. Increased Akt protein expression was associated with reduced phospho-AMP-activated protein kinase abundance and with a fall in the phosphorylation of acetyl-CoA carboxylase, which in turn resulted in an increase in the content of muscular malonyl-CoA (2.4-fold, P<0.05) and lactate (1.4-fold, P<0.05). Troglitazone treatment did not affect the mRNA levels of either Akt1 or Akt2, suggesting that a transcriptional mechanism was not involved, but caused a dramatic reduction in the content of muscular ceramides (76%, P<0.001), lipid-derived second messengers known to increase Akt degradation. Our data indicate that troglitazone treatment inhibited de novo ceramide synthesis, since the content of its precursor, palmitoyl-CoA, was reduced (55%, P=0.05). These results were confirmed in C2C12 myotubes, where troglitazone treatment increased Akt protein expression and prevented the reduction of this protein and the increase in ceramide levels caused by palmitate. These findings implicate ceramide as an important intermediate in the regulation of Akt after troglitazone treatment.

journal_name

Biochem Pharmacol

journal_title

Biochemical pharmacology

authors

Planavila A,Alegret M,Sánchez RM,Rodríguez-Calvo R,Laguna JC,Vázquez-Carrera M

doi

10.1016/j.bcp.2005.01.015

subject

Has Abstract

pub_date

2005-04-15 00:00:00

pages

1195-204

issue

8

eissn

0006-2952

issn

1873-2968

pii

S0006-2952(05)00069-9

journal_volume

69

pub_type

杂志文章

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