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Single cell assay of exocytosis from pancreatic islet B cells.

Authors
Type
Published Article
Journal
Pflügers Archiv : European journal of physiology
Publication Date
Volume
420
Issue
1
Pages
121–123
Identifiers
PMID: 1553260
Source
Medline
License
Unknown

Abstract

We have measured changes in membrane capacitance (delta Cm) in pancreatic B cells as a single cell assay of insulin secretion. Evidence that depolarization evoked delta Cm reflects exocytosis includes it's voltage, temperature and Ca2+ o dependence. Decreases in Cm, presumably reflecting endocytosis, occur on a variable time scale. Two features that make B cells unique among excitable cells are the large magnitude of delta Cm, when normalized to Ca2+ current, and the rapid "fatigue" of the response for even minimal stimulation, perhaps due to the depletion of a readily releasable pool of vesicles.

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