Abstract：
:Cellular growth and glucose uptake are regulated by multiple signals generated by the insulin receptor. The mechanisms of individual modulation of these signals remain somewhat elusive. We investigated the role of CaMKII in insulin signalling in a rat skeletal muscle cell line, demonstrating that CaMKII modulates the insulin action on DNA synthesis and the negative feedback that down regulates glucose uptake. Insulin stimulation generated partly independent signals leading to the rapid activation of Akt, Erk-1/2 and CaMKII. Akt activation was followed by Glut-4 translocation to the plasma membrane and increase of glucose uptake. Then, IRS-1 was phosphorylated at S612, the IRS-1/p85PI3K complex was disrupted, Akt was no more phosphorylated and both Glut-4 translocation and glucose uptake were reduced. Inhibition of CaMKII abrogated the insulin-induced Erk-1/2 activation, DNA synthesis and phosphorylation of IRS-1 at S612. Inhibition of CaMKII also abrogated the down-regulation of insulin-stimulated Akt phosphorylation, Glut-4 membrane translocation and glucose uptake. These results demonstrate that: 1 - CaMKII modulates the insulin-induced Erk-1/2 activation and cell proliferation; 2 - after the initial stimulation of the IRS-1/Akt pathway, CaMKII mediates the down-regulation of stimulated glucose uptake. This represents a novel mechanism in the selective control of insulin signals, and a possible site for pharmacological intervention.
journal_name
Cell Signaljournal_title
Cellular signallingauthors
Illario M,Monaco S,Cavallo AL,Esposito I,Formisano P,D'Andrea L,Cipolletta E,Trimarco B,Fenzi G,Rossi G,Vitale Mdoi
10.1016/j.cellsig.2009.01.022subject
Has Abstractpub_date
2009-05-01 00:00:00pages
786-92issue
5eissn
0898-6568issn
1873-3913pii
S0898-6568(09)00024-2journal_volume
21pub_type
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