Oral treatment with vanadium of Zucker fatty rats activates muscle glycogen synthesis and insulin-stimulated protein phosphatase-1 activity.

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 Biochem

authors

Semiz S,McNeill JH

doi

10.1023/a:1016116700632

keywords:

subject

Has Abstract

pub_date

2002-07-01 00:00:00

pages

123-31

issue

1-2

eissn

0300-8177

issn

1573-4919

journal_volume

236

pub_type

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