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Vanadium increases GLUT4 in diabetic rat skeletal muscle
Askar Mohammad1, Vijay Sharma, John H McNeill
1Division of Pharmacology and Toxicology, Faculty of Pharmaceutical Sciences, University of British Columbia, Vancouver, Canada.
Molecular and Cellular Biochemistry
|June 27, 2002
Summary
Vanadium compounds like BMOV rapidly lower blood glucose in diabetic animals. This study shows BMOV restores normal glucose transporter (GLUT4) levels in muscle, explaining vanadium's blood sugar-lowering effects in vivo.
Area of Science:
- Biochemistry
- Pharmacology
- Endocrinology
Background:
- Vanadium's ability to lower blood glucose in diabetic models is known, but its mechanism remains unclear.
- In vitro studies suggest vanadium affects insulin signaling, but in vivo evidence is lacking.
- Glucose transporters (GLUTs), particularly insulin-dependent GLUT4, are crucial for glucose regulation.
Purpose of the Study:
- To investigate the in vivo mechanism of vanadium's glucose-lowering effect in diabetic animals.
- To determine if vanadium impacts glucose transporter 4 (GLUT4) expression in vivo.
Main Methods:
- Streptozotocin (STZ)-induced diabetic rats were treated with a single oral dose of BMOV (an organic vanadium compound).
- Plasma glucose levels were monitored over 72 hours.
- Skeletal muscle membrane fractions were analyzed for GLUT4 levels using a specific antibody.
Main Results:
- A single oral dose of BMOV rapidly normalized plasma glucose in STZ-diabetic rats within 24 hours, with effects lasting over 72 hours.
- Diabetic animals showed reduced GLUT4 levels in skeletal muscle membranes.
- BMOV treatment restored normal GLUT4 levels in the muscle membrane fraction.
Conclusions:
- This study provides the first in vivo evidence that vanadium directly regulates GLUT4 expression in diabetic animals.
- The restoration of GLUT4 levels by BMOV may partially explain its potent glucoregulatory effects.