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PMID: 1645520 Published · ppublish English Journal Article Research Support, Non-U.S. Gov't

Bovine adrenal chromaffin cells contain an inositol 1,4,5-trisphosphate-insensitive but caffeine-sensitive Ca2+ store that can be regulated by intraluminal free Ca2+.

The Biochemical journal ·Vol. 275 ( Pt 3) ·1991-05-01 ·Pages 697-701

Cheek TR, Barry VA, Berridge MJ, Missiaen L

Abstract

We have characterized some properties of the caffeine-sensitive Ca2+ store in bovine chromaffin cells. Addition of 10 mM-caffeine to permeabilized cells that were allowed to sequester Ca2+ in the presence of the precipitating anion pyrophosphate induced a transient rise in free Ca2+ concentration that was blocked by 10 microM-Ruthenium Red. Caffeine was able to release Ca2+ after the InsP3-sensitive Ca2+ pool had been completely emptied, and 10 microM-InsP3 still released Ca2+ in the presence of a high dose (50 mM) of caffeine, indicating that there are selectively sensitive Ca2+ pools in these cells. The progressive hydrolysis of pyrophosphate by a cytosolic pyrophosphatase induced a spontaneous Ca2+ release after a latency. Caffeine prevented this spontaneous Ca2+ release, indicating that the pyrophosphate-sensitive Ca2+ pool was caffeine-sensitive. On varying the free Ca2+ concentration within the caffeine-sensitive pool (by using methylenediphosphonic acid, pyrophosphate or no precipitating anion), we observed that the Ca(2+)-releasing effect of caffeine was dependent on an elevated intraluminal free Ca2+ concentration. In conclusion, the caffeine-sensitive Ca2+ store in bovine chromaffin cells is largely distinct from the InsP3-sensitive Ca2+ store, and its release mechanism shares characteristics with the ryanodine receptor of muscle cells.

MeSH Terms

Adrenal Medulla/metabolism Animals Caffeine/pharmacology Calcium/metabolism Cattle Cell Membrane Permeability Chromaffin System/drug effects,metabolism Diphosphates/pharmacology Inositol 1,4,5-Trisphosphate/pharmacology

Chemicals

Diphosphates Caffeine Inositol 1,4,5-Trisphosphate Calcium

Authors & Affiliations

4 authors, click to expand affiliations / ORCID

Cheek T R

AFRC Laboratory of Molecular Signalling, Department of Zoology, University of Cambridge, U.K.

Barry V A

Berridge M J

Missiaen L

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Article Info

Journal

The Biochemical journal

Abbr.

Biochem J

ISSN

0264-6021

DOI

10.1042/bj2750697

Published

1991-05-01

Pages

697-701

Language

English

Region

England

NLM ID

2984726R

PMCID

PMC1150110

Subset

External Links

PubMed source DOI: 10.1042/bj2750697 PMC Full Text View journal details

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Bovine adrenal chromaffin cells contain an inositol 1,4,5-trisphosphate-insensitive but caffeine-sensitive Ca2+ store that can be regulated by intraluminal free Ca2+.

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