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| Content Provider | PubMed Central |
|---|---|
| Author | Sener, A. Levy, J. Malaisse, W. J. |
| Abstract | 1. The metabolism of glucose and the exchangeable Ca2+ pool were measured in rat pancreatic islets, in order to assess the possible significance of glycolysis in the process of glucose-induced insulin release. 2. At high glucose concentration (16.7 mM), glucose was metabolized at the following rate (pmol of glucose residue/h per islet +/- S.E.M.): 131 +/- 11 for glucose uptake, 129+/-8 for glucose utilization, as judged by the conversion of [5-3H]glucose into 3H2O,60+/-2 for lactate output and 25+/-2 for glucose oxidation. 3. The secretory pattern usually correlated with the metabolic data. For instance, the ability of different sugars (glucose, mannose, fructose, galactose, D-glyceraldehyde) to stimulate lactate output closely paralleled their relative insulinotropic capacity. A disparity between metabolic and secretory responses was, however, encountered in the presence of dibutyryl cyclic AMP and theophylline. 4. Despite this contrasting behaviour, the size of the Ca2+- exchangeable pool (net uptake of 45Ca2+) was invariably proportional to the rate of lactate output under all experimental conditions examined. It is concluded that glycolysis usually exerts a tight control on the rate constant for Ca2+ transport across the B-cell membrane. |
| Starting Page | 521 |
| File Format | |
| ISSN | 14708728 |
| e-ISSN | 14708728 |
| Journal | Biochemical Journal |
| Issue Number | 3 |
| Volume Number | 156 |
| Language | English |
| Publisher Date | 1976-06-15 |
| Access Restriction | Open |
| Subject Keyword | Research in Higher Education |
| Content Type | Text |
| Resource Type | Article |
| Subject | Cell Biology Molecular Biology Biochemistry |
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