The effect of insulin and exercise on c-Cbl protein abundance and phosphorylation in insulin-resistant skeletal muscle in lean and obese Zucker rats.

Abstract:

AIMS/HYPOTHESIS:Recruitment of the protein c-Cbl to the insulin receptor (IR) and its tyrosine phosphorylation via a pathway that is independent from phosphatidylinositol 3'-kinase is necessary for insulin-stimulated GLUT4 translocation in 3T3-L1 adipocytes. The activation of this pathway by insulin or exercise has yet to be reported in skeletal muscle. METHODS:Lean and obese Zucker rats were randomly assigned to one of three treatment groups: (i). control, (ii). insulin-stimulated or (iii). acute, exhaustive exercise. Hind limb skeletal muscle was removed and the phosphorylation state of IR, Akt and c-Cbl measured. RESULTS:Insulin receptor phosphorylation was increased 12-fold after insulin stimulation ( p<0.0001) in lean rats and threefold in obese rats. Acute exercise had no effect on IR tyrosine phosphorylation. Similar results were found for serine phosphorylation of Akt. Exercise did not alter c-Cbl tyrosine phosphorylation in skeletal muscle of lean or obese rats. However, in contrast to previous studies in adipocytes, c-Cbl tyrosine phosphorylation was reduced after insulin treatment ( p<0.001). CONCLUSIONS/INTERPRETATION:We also found that c-Cbl associating protein expression is relatively low in skeletal muscle of Zucker rats compared to 3T3-L1 adipocytes and this could account for the reduced c-Cbl tyrosine phosphorylation after insulin treatment. Interestingly, basal levels of c-Cbl tyrosine phosphorylation were higher in skeletal muscle from insulin-resistant Zucker rats ( p<0.05), but the physiological relevance is not clear. We conclude that the regulation of c-Cbl phosphorylation in skeletal muscle differs from that previously reported in adipocytes.

journal_name

Diabetologia

journal_title

Diabetologia

authors

Wadley GD,Bruce CR,Konstantopoulos N,Macaulay SL,Howlett KF,Hawley JA,Cameron-Smith D

doi

10.1007/s00125-003-1322-2

subject

Has Abstract

pub_date

2004-03-01 00:00:00

pages

412-419

issue

3

eissn

0012-186X

issn

1432-0428

pii

10.1007/s00125-003-1322-2

journal_volume

47

pub_type

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