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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Differential effects of des IGF-1 on Erks, AKT-1 and P70 S6K activation in mouse skeletal and cardiac muscle.

Alterations in the degree of the phosphorylation of ERKI/2, Akt-1 and p70 S6K in mouse skeletal and cardiac muscle was examined in vivo following an intraperitoneal injection of des IGF-I. Plasma levels of insulin, IGF-I and glucose were measured. The administration of des IGF-I had no effect on plasma levels of insulin, or IGF-I, but plasma glucose levels were decreased about 50% (p < 0.01). In both skeletal and cardiac muscle, des IGF-I increased the phosphorylation of Akt-1 at Ser 473 (p < 0.01) with no change in the phosphorylation of p44 and p42 MAP kinases at Thr202/Tyr204. The phosphorylation of p70 S6K at Thr421/Ser424 was increased in skeletal muscle (p < 0.01), but not in cardiac muscle. The phosphorylation of the nuclear transcription factor CREB phosphorylation at Ser 133 was not significantly changed in either skeletal or cardiac muscle. Des IGF-I increased the phosphorylation of the transcription factor FKHR in cardiac muscle only (p < 0.05). These data demonstrate that the administration of des IGF-I had differential effects on the activation of the MAP kinase and PI 3-kinase pathways in mouse skeletal and cardiac muscle.[1]


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