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Calcium-antagonists and islet function. IV. Effect of D600
Diabetologia
|March 1, 1976
Summary
The drug D600 rapidly and reversibly inhibits glucose-stimulated insulin release by blocking calcium (Ca2+) entry into pancreatic beta cells. This action affects insulin secretion but not glucose recognition.
Area of Science:
- Pharmacology
- Endocrinology
- Cell Biology
Background:
- Insulin release from pancreatic beta cells is a calcium-dependent process.
- Understanding modulators of insulin secretion is crucial for diabetes research.
Purpose of the Study:
- To investigate the mechanism of action of D600 on glucose-induced insulin release.
- To determine if D600 affects calcium (Ca2+) handling in beta cells.
Main Methods:
- Dose-response studies of D600 on insulin release.
- Assays measuring 45Ca2+ uptake and efflux in isolated pancreatic islets.
- Evaluation of D600's effect on the action of other insulin secretagogues.
Main Results:
- D600 caused a dose-related, rapid, and reversible inhibition of glucose-induced insulin release.
- The drug suppressed sulphonylurea action but not theophylline's effect on insulin release.
- D600 reduced basal and glucose-stimulated 45Ca2+ uptake without altering 45Ca2+ efflux.
- Glucose recognition by beta cells remained unaffected by D600.
Conclusions:
- D600 primarily acts by inhibiting calcium (Ca2+) entry into pancreatic beta cells.
- This inhibition of Ca2+ influx is the likely mechanism behind D600's effect on insulin secretion.