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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Carlier, P. G. Bloch, G. Velho, G. Roussel, R. Robert, J. J. |
| Description | Author Affiliation: Roussel R ( Commissariat à l'Energie Atomique, Service Hospitalier Frédéric Joliot, Département de Recherche Médicale, Orsay, Paris, France.); |
| Abstract | The muscle intracellular (IC) free glucose concentration and the rate of muscle glycogen synthesis were measured by using in vivo 13C and 31P NMR spectroscopy in normal volunteers under hyperinsulinemic ( approximately 300 pM) clamp conditions at the following three plasma glucose levels: euglycemia ( approximately 6 mM), mild ( approximately 10 mM), and high ( approximately 16 mM) hyperglycemia. In keeping with biopsy studies, muscle IC free glucose concentration at euglycemia (-0.03 +/- 0.03 mmol/kg of muscle, mean +/- SEM, n = 10) was not statistically different from zero. A small but statistically significant amount of IC free glucose was observed during mild and high hyperglycemia: 0.15 +/- 0.08 (n = 5) and 0.43 +/- 0.20 mmol/kg of muscle (n = 5), respectively. Muscle glycogen synthesis rate, in mmol per kg of muscle per min, was 111 +/- 11 at euglycemia (n = 10), 263 +/- 29 during mild hyperglycemia (n = 5), and 338 +/- 42 during high hyperglycemia (n = 5), these three rates being significantly different from each other. As previous in vitro and in vivo studies, these rates suggest a Km (concentration at which unidirectional glucose transport reaches half-maximal rate) of the muscle glucose transport system in the 15-25 mM range under hyperinsulinemic conditions. The low concentrations of muscle IC free glucose observed under hyperinsulinemic conditions were interpreted, with this estimate and in the framework of metabolic control theory, as glucose transport being the predominant step controlling muscle glucose flux not only at euglycemia but also during hyperglycemia. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 3 |
| Volume Number | 95 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 1998-03-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Glucose Metabolism Monosaccharide Transport Proteins Muscle, Skeletal Biological Transport Blood Glucose Carbon Isotopes Insulin Blood Magnetic Resonance Spectroscopy Phosphorus Isotopes Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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