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Does glucose decrease cytosolic free calcium in normal pancreatic islet cells?
1Laboratory of Pharmacology, Brussels University School of Medicine, Belgium.
Research Communications in Chemical Pathology and Pharmacology
|February 1, 1989
Summary
Glucose affects cytosolic free calcium concentration ([Ca2+]i) in rat pancreatic islet cells. It initially decreases [Ca2+]i before causing a secondary rise, suggesting dual regulatory effects.
Area of Science:
- Endocrinology
- Cell Physiology
- Calcium Signaling
Background:
- Cytosolic free calcium concentration ([Ca2+]i) is crucial for pancreatic islet cell function.
- Glucose metabolism regulates insulin secretion and intracellular calcium dynamics.
Purpose of the Study:
- To investigate the dynamic changes in [Ca2+]i in response to glucose in normal rat pancreatic islet cells.
- To elucidate the mechanisms underlying glucose-induced alterations in [Ca2+]i.
Main Methods:
- Measurement of [Ca2+]i using the fura 2 intracellular calcium indicator.
- Utilizing isolated normal rat pancreatic islet cells.
Main Results:
- Glucose induced a biphasic response in [Ca2+]i: an initial decrease followed by a secondary rise.
- The initial decrease in [Ca2+]i mirrored glucose-induced 45Ca efflux.
- The secondary rise in [Ca2+]i was attributed to increased calcium influx.
Conclusions:
- Glucose exerts a dual effect on [Ca2+]i in pancreatic islet cells.
- Glucose may inhibit and stimulate [Ca2+]i through distinct mechanisms.
- These findings contribute to understanding glucose-mediated calcium signaling in islets.