Document Detail

Contraction-activated glucose uptake is normal in insulin-resistant muscle of the obese Zucker rat.
MedLine Citation:
PMID:  1506395     Owner:  NLM     Status:  MEDLINE    
The rates of muscle glucose uptake of lean and obese Zucker rats were assessed via hindlimb perfusion under basal conditions (no insulin), in the presence of a maximal insulin concentration (10 mU/ml), and after electrically stimulated muscle contraction in the absence of insulin. The perfusate contained 28 mM glucose and 7.5 microCi/mmol of 2-deoxy-D-[3H-(G)]glucose. Glucose uptake rates in the soleus (slow-twitch oxidative fibers), red gastrocnemius (fast-twitch oxidative-glycolytic fibers), and white gastrocnemius (fast-twitch glycolytic fibers) under basal conditions and after electrically stimulated muscle contraction were not significantly different between the lean and obese rats. However, the rate of glucose uptake during insulin stimulation was significantly lower for obese than for lean rats in all three fiber types. Significant correlations were found for insulin-stimulated glucose uptake and glucose transporter protein isoform (GLUT-4) content of soleus, red gastrocnemius, and white gastrocnemius of lean (r = 0.79) and obese (r = 0.65) rats. In contrast, the relationships between contraction-stimulated glucose uptake and muscle GLUT-4 content of lean and obese rats were negligible because of inordinately low contraction-stimulated glucose uptakes by the solei. These results suggest that maximal skeletal muscle glucose uptake of obese Zucker rats is resistant to stimulation by insulin but not to contractile activity. In addition, the relationship between contraction-stimulated glucose uptake and GLUT-4 content appears to be fiber-type specific.
J T Brozinick; G J Etgen; B B Yaspelkis; J L Ivy
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of applied physiology (Bethesda, Md. : 1985)     Volume:  73     ISSN:  8750-7587     ISO Abbreviation:  J. Appl. Physiol.     Publication Date:  1992 Jul 
Date Detail:
Created Date:  1992-09-21     Completed Date:  1992-09-21     Revised Date:  2013-09-26    
Medline Journal Info:
Nlm Unique ID:  8502536     Medline TA:  J Appl Physiol (1985)     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  382-7     Citation Subset:  IM    
Department of Kinesiology, University of Texas, Austin 78712.
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MeSH Terms
Deoxyglucose / pharmacology
Electric Stimulation
Glucose / metabolism*
Insulin Resistance / physiology*
Monosaccharide Transport Proteins / metabolism
Muscle Contraction / drug effects
Muscles / metabolism*,  physiology
Obesity / metabolism*
Rats, Zucker
Reg. No./Substance:
0/Monosaccharide Transport Proteins; 154-17-6/Deoxyglucose; 50-99-7/Glucose

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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