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Effects of diabetes, vanadium, and insulin on glycogen synthase activation in Wistar rats

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Abstract

In vivo effects of insulin and vanadium treatment on glycogen synthase (GS), glycogen synthase kinase-3 (GSK-3) and protein phosphatase-1 (PP1) activity were determined in Wistar rats with streptozotocin (STZ)-induced diabetes. The skeletal muscle was freeze-clamped before or following an insulin injection (5 U/kg i.v.). Diabetes, vanadium, and insulin in vivo treatment did not affect muscle GSK-3β activity as compared to controls. Following insulin stimulation in 4-week STZ-diabetic rats muscle GS fractional activity (GSFA) was increased 3 fold (p < 0.05), while in 7-week diabetic rats it remained unchanged, suggesting development of insulin resistance in longer term diabetes. Muscle PP1 activity was increased in diabetic rats and returned to normal after vanadium treatment, while muscle GSFA remained unchanged. Therefore, it is possible that PP1 is involved in the regulation of some other cellular events of vanadium (other than regulation of glycogen synthesis). The lack of effect of vanadium treatment in stimulating glycogen synthesis in skeletal muscle suggests the involvement of other metabolic pathways in the observed glucoregulatory effect of vanadium.

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Authors
  1. Sabina Semiz
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  2. Chris Orvig
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  3. John H. McNeill
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Semiz, S., Orvig, C. & McNeill, J.H. Effects of diabetes, vanadium, and insulin on glycogen synthase activation in Wistar rats. Mol Cell Biochem 231, 23–35 (2002). https://doi.org/10.1023/A:1014437019586

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