Document Detail

Expression of equine glucose transporter type 4 in skeletal muscle after glycogen-depleting exercise.
MedLine Citation:
PMID:  15822579     Owner:  NLM     Status:  MEDLINE    
OBJECTIVES: To clone and sequence cDNA for equine insulin-responsive glucose transporter (glucose transporter type 4 [GLUT-4]) and determine effects of glycogen-depleting exercise and meal type after exercise on GLUT-4 gene expression in skeletal muscle of horses. SAMPLE POPULATION: Muscle biopsy specimens from 7 healthy adult horses. PROCEDURES: Total RNA was extracted from specimens, and GLUT-4 cDNA was synthesized and sequenced. Horses were exercised on 3 consecutive days. On the third day of exercise, for 8 hours after exercise, horses were either not fed, fed half of daily energy requirements as hay, or fed an isocaloric amount of corn. The GLUT-4 mRNA was determined by use of real-time reverse transcriptase-polymerase chain reaction in muscle biopsy specimens obtained before 3 consecutive days of exercise and within 10 minutes and 4, 8, and 24 hours after the third exercise bout. RESULTS: A 1,629-bp segment was sequenced, of which 1,530 bp corresponded to the coding region end encoded a protein of 509 amino acids. Expression of GLUT-4 gene increased by 2.3, 4.3, 3.3, and 2.6 times 10 minutes and 4, 8, and 24 hours after exercise, respectively, compared with that prior to exercise. No differences were observed in GLUT-4 gene expression among conditions of feed withholding, corn feeding, and hay feeding during the 8 hours postexercise. CONCLUSIONS AND CLINICAL RELEVANCE: Lack of increase of GLUT-4 gene expression after grain feeding and exercise may explain the apparently slower rate of glycogen synthesis after exercise in horses relative to that of other species.
Eduard Jose-Cunilleras; Kathleen A Hayes; Ramiro E Toribio; Lawrence E Mathes; Kenneth W Hinchcliff
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  American journal of veterinary research     Volume:  66     ISSN:  0002-9645     ISO Abbreviation:  Am. J. Vet. Res.     Publication Date:  2005 Mar 
Date Detail:
Created Date:  2005-04-12     Completed Date:  2005-05-02     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0375011     Medline TA:  Am J Vet Res     Country:  United States    
Other Details:
Languages:  eng     Pagination:  379-85     Citation Subset:  IM    
Department of Veterinary Clinical Sciences, College of Veterinary Medicine, The Ohio State University, Columbus, OH 43210, USA.
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MeSH Terms
Amino Acid Sequence
Analysis of Variance
Base Sequence
Cloning, Molecular
Cluster Analysis
DNA Primers
DNA, Complementary / genetics
Gene Expression Regulation / physiology*
Glucose Transporter Type 4
Glycogen / metabolism
Horses / metabolism*
Molecular Sequence Data
Monosaccharide Transport Proteins / genetics,  metabolism*
Muscle Proteins / genetics,  metabolism*
Muscle, Skeletal / metabolism*
Physical Conditioning, Animal
RNA, Messenger / metabolism*
Reverse Transcriptase Polymerase Chain Reaction
Sequence Alignment
Sequence Analysis, DNA
Sequence Homology
Reg. No./Substance:
0/DNA Primers; 0/DNA, Complementary; 0/Glucose Transporter Type 4; 0/Monosaccharide Transport Proteins; 0/Muscle Proteins; 0/RNA, Messenger; 9005-79-2/Glycogen

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

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