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In studies using subtraction cloning to screen for alterations in mRNA expression in skeletal muscle from humans with Type 2 diabetes mellitus and control subjects, one of the most prominent differences was in the mRNA for elongation factor (EF)-1alpha. With Northern blot analysis, EF-1alpha expression was enhanced by 2- to 6-fold in both Types 1 and 2 human diabetics. In contrast, no changes in expression of EF-1beta or -gamma were noted. We observed similar results in animal models of Type 1 diabetes. EF-1alpha expression, but not EF-1beta or -gamma expression, was also enhanced in streptozotocin-induced diabetic rats, and this effect was reversed by insulin treatment. An increased level of EF-1alpha mRNA was also observed in nonobese diabetic mice. This unbalanced regulation of the expression of the different subunits of EF-1 may contribute to alterations not only in protein synthesis but also in other cellular events observed in the diabetic state.

Unbalanced expression of the different subunits of elongation factor 1 in diabetic skeletal muscle