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GLUT3 protein and mRNA in autopsy muscle specimensGLUT3 is expressed in rat muscle, but this glucose transporter protein has not been identified previously in adult human skeletal muscle. We quantified the rapidity of disappearance of mRNA and protein from human skeletal muscle at room temperature and at 4 degrees C. Fifty percent of the immunologically detectable GLUT3 protein disappeared by 1 hour at 20 degrees C and by 2 hours at 4 degrees C. mRNA for GLUT3 was decreased 50% by 2.2 hours at 20 degrees C and by 24 hours at 4 degrees C. Half of the measurable mRNAs for GLUT4, glyceraldehyde 3-phosphate dehydrogenase (GAPDH), alpha-actin, and beta-myosin disappeared by 0.8 to 2.1 hours at 20 degrees C and by 5.0 to 16.6 hours at 4 degrees C. Previous conclusions that GLUT3 is not expressed in human muscle were likely drawn because of artifacts related to degradation of GLUT3 protein in the specimens prior to study. Because of the rapid degradation of protein and mRNA, autopsy specimens of muscle must be obtained within 6 hours of death, and even then, protein and mRNA data will likely dramatically underestimate their expression in fresh muscle. Some previously published conclusions and recommendations regarding autopsy specimens are not stringent enough to consistently yield useful protein and mRNA.
Document ID
20040141886
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Stuart, C. A.
(The University of Texas Medical Branch at Galveston 77555-1060, United States)
Wen, G.
Jiang, J.
Date Acquired
August 22, 2013
Publication Date
July 1, 1999
Publication Information
Publication: Metabolism: clinical and experimental
Volume: 48
Issue: 7
ISSN: 0026-0495
Subject Category
Life Sciences (General)
Funding Number(s)
CONTRACT_GRANT: DK33749
Distribution Limits
Public
Copyright
Other
Keywords
Non-NASA Center
NASA Discipline Regulatory Physiology

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