The metabolism of cyclic AMP and glucose in isolated islets from Acomys cahirinus.

Abstract:

:Glucose-induced cyclic (3H) AMP accumulation, insulin secretory responses and the metabolism of glucose were studied in pancreatic islets from Acomys cahirinus. 27.7 mmol/l of glucose stimulated neither islet cyclic (3H) AMP accumulation nor insulin release during the first 5 min of incubation. Stimulation by glucose of cyclic (3H) AMP was observed after 15 min of incubation and insulin release was markedly stimulated between 15 and 30 min. The utilization of glucose, measured as the production of (3H)2O from (5--3H) glucose was stimulated by glucose after 10 min and proceeded at an apparently linear rate during a 20 min incubation period. In incubations of 5 min, glibenclamide, glucagon or chloromercuribenzene-p-sulphonic acid failed to stimulate islet cyclic (3H) AMP accumulation. 3-isobutyl-l-methylxanthine in a concentration of 1.0 mmol/l was the only agent tested that elevated rapidly (1 min) islet cyclic (3H) AMP. None of the agents tested elicited an insulin secretory response in 5 min incubations. It is concluded that 1) no gross defect is apparent in the utilization of glucose by Acomys islets, 2) the secretory derangement of the Acomys is associated with a delayed cyclic AMP response to glucose, 3) however a decreased level of cyclic AMP cannot be the sole explanation for the delayed insulin secretion in the Acomys.

journal_name

Diabetologia

journal_title

Diabetologia

authors

Grill V,Cerasi E

doi

10.1007/BF00423150

subject

Has Abstract

pub_date

1979-01-01 00:00:00

pages

47-50

issue

1

eissn

0012-186X

issn

1432-0428

journal_volume

16

pub_type

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