@article {499, title = {Effects of diabetes, vanadium, and insulin on glycogen synthase activation in Wistar rats}, journal = {Molecular and Cellular Biochemistry}, volume = {231}, number = {1-2}, year = {2002}, note = {ISI Document Delivery No.: 527LATimes Cited: 21Cited Reference Count: 51}, month = {Feb}, pages = {23-35}, type = {Article}, 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-3beta 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.}, keywords = {BLOOD-GLUCOSE, GLUCOSE-TRANSPORT, glycogen, IN-VITRO, insulin resistance, MELLITUS, MOLECULAR MECHANISM, PHOSPHORYLATION, PROTEIN-KINASE-B, RABBIT SKELETAL-MUSCLE, S6 KINASE, serine/threonine kinases and phosphatases, streptozotocin-induced diabetes, SYNTHESIS, VANADATE}, isbn = {0300-8177}, url = {://000174186500004}, author = {Semiz, S. and Orvig, Chris and McNeill, J. H.} } @article {2940, title = {GLUCOSE-LOWERING EFFECTS OF A NEW ORGANIC VANADIUM COMPLEX, BIS(MALTOLATO)OXOVANADIUM(IV)}, journal = {Canadian Journal of Physiology and Pharmacology}, volume = {71}, number = {3-4}, year = {1993}, note = {ISI Document Delivery No.: LN775Times Cited: 84Cited Reference Count: 39}, month = {Mar-Apr}, pages = {263-269}, type = {Article}, abstract = {Inorganic vanadium has been shown, both in vivo and in vitro, to have insulin-mimetic properties. A new organic vanadium complex, bis(maltolato)oxovanadium(IV) (BMOV), was developed to increase the absorption of vanadium from the gastrointestinal tract, thereby reducing the dose of vanadium necessary to produce glucose-lowering effects. BMOV was administered in the drinking water for 25 weeks to control and streptozotocin-induced diabetic, male Wistar rats. BMOV treatment produced a stable euglycemic state in 70\% of diabetic treated animals. The other 30\% of the diabetic treated animals demonstrated fluctuations in glucose control over the entire study period. The initial effective dose of BMOV was 0.45 mmol/kg, which decreased to an effective maintenance dose of 0. 18 mmol/kg, significantly lower than the dose of inorganic vanadium salts used in previous studies. BMOV treatment did significantly reduce fluid consumption levels in control treated animals after 10 weeks of therapy; however, the food consumption for control treated animals was only intermittently lower than that for controls. Plasma cholesterol and triglyceride levels were normalized with BMOV treatment for all diabetic treated animals, without a concomitant increase in plasma insulin levels. An oral glucose tolerance test demonstrated that glucose homeostasis in control-treated animals occurred at significantly lower plasma insulin levels than in control animals. BMOV effectively produced the glucose-lowering effects at significantly lower dose than previously used for inorganic vanadium salts, without any overt signs of toxicity.}, keywords = {ACTIVATION, ADIPOCYTES, BIS(MALTOLATO)OXOVANADIUM(IV), BLOOD-GLUCOSE, DIABETES TREATMENT, DIABETIC RATS, GLYCOLYSIS, INSULIN, SENSITIVITY, SKELETAL-MUSCLE, STIMULATION, streptozotocin-induced diabetes, VANADATE}, isbn = {0008-4212}, url = {://A1993LN77500013}, author = {Yuen, V. G. and Orvig, Chris and McNeill, J. H.} }