Abstract:
:Since the glucose-lowering effects of vanadium could be related to increased muscle glycogen synthesis, we examined the in vivo effects of vanadium and insulin treatment on glycogen synthase (GS) activation in Zucker fatty rats. The GS fractional activity (GSFA), protein phosphatase-1 (PP1), and glycogen synthase kinase-3 (GSK-3) activity were determined in fatty and lean rats following treatment with bis(maltolato)oxovanadium(IV) (BMOV) for 3 weeks (0.2 mmol/kg/day) administered in drinking water. Skeletal muscle was freeze-clamped before or following an insulin injection (5 U/kg i.v.). In both lean and fatty rats, muscle GSFA was significantly increased at 15 min following insulin stimulation. Vanadium treatment resulted in decreased insulin levels and improved insulin sensitivity in the fatty rats. Interestingly, this treatment stimulated muscle GSFA by 2-fold (p < 0.05) and increased insulin-stimulated PP1 activity by 77% (p < 0.05) in the fatty rats as compared to untreated rats. Insulin resistance, vanadium and insulin in vivo treatment did not affect muscle GSK-3beta activity in either fatty or lean rats. Therefore, an impaired insulin sensitivity in the Zucker fatty rats was improved following vanadium treatment, resulting in an enhanced muscle glucose metabolism through increased GS and insulin-stimulated PPI activity.
journal_name
Mol Cell Biochemjournal_title
Molecular and cellular biochemistryauthors
Semiz S,McNeill JHdoi
10.1023/a:1016116700632keywords:
subject
Has Abstractpub_date
2002-07-01 00:00:00pages
123-31issue
1-2eissn
0300-8177issn
1573-4919journal_volume
236pub_type
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