Metabolism of D-[3-3H]glucose, D-[5-3H]glucose, D-[U-14C]glucose, D-[1-14C]glucose and D-[6-14C]glucose in pancreatic islets in an animal model of type-2 diabetes.
This study aims at exploring specific aspects of D-glucose metabolism, so far not yet investigated, in pancreatic islets from adult control rats and animals (STZ rats) injected with streptozotocin during the neonatal period. The latter animals, which represent a current model of type-2 diabetes, displayed a lower body weight, higher plasma D-glucose concentration and lower insulinogenic index than control rats. The protein, DNA and insulin content were all also lower in islets prepared from STZ, rather than control rats. In the presence of 10.0 mM D-glucose, the paired ratio between D-[U-14C]glucose oxidation and D-[5-3H]glucose utilization was also decreased in the islets from STZ rats. No significant difference between control and STZ rats was observed, however, in terms of the ratios between D-[3-3H]glucose and D-[5-3H]glucose utilization, between the generation of radioactive lactate from 14C-labelled D-glucose and tritiated D-glucose utilization and between D-[1-14C]glucose and D-[6-14C]glucose oxidation. These findings reinforce the view that the previously documented preferential impairment of the oxidative modality of glycolysis in islets from STZ rats contrasts with the absence of any major anomaly in other variables of D-glucose catabolism.
Giroix
Marie-Helene
MH
Laboratory of Nutrition Physiopathology, Unité Mixte de Recherche du Centre National de la Recherche Scientifique 7059, University of Paris 7, F-75251 Paris 05, France.
Nadi
Abdellatif Bakkali
AB
Sener
Abdullah
A
Portha
Bernard
B
Malaisse
Wiily J
WJ
D000818:Animals; D002250:Carbon Radioisotopes; D003924:Diabetes Mellitus, Type 2 / Q000378:metabolism*; D004195:Disease Models, Animal; D005947:Glucose / Q000378:metabolism*; D006019:Glycolysis; D007515:Islets of Langerhans / Q000378:metabolism*; D019344:Lactic Acid / Q000378:metabolism; D008297:Male; D051381:Rats; D017208:Rats, Wistar; D014316:Tritium
D002250:Carbon Radioisotopes; D014316:Tritium; D019344:Lactic Acid; D005947:Glucose