Fast calcium transients in rat peritoneal mast cells are not sufficient to trigger exocytosis.

E. Neher; W. Almers

doi:10.1002/j.1460-2075.1986.tb04176.x

Fast calcium transients in rat peritoneal mast cells are not sufficient to trigger exocytosis.

E. Neher, W. Almers

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Abstract

The calcium concentration, [Ca]i, in single rat peritoneal mast cells was measured by means of the new Ca indicator dye fura-2. Upon stimulation with antigen or compound 48/80, [Ca]i rose for seconds to values greater than 5 microM. These Ca transients did not depend on the presence of extracellular Ca, and they sometimes occurred spontaneously, especially in the presence of exogenous phosphatidylserine. Calcium transients did not necessarily lead to degranulation. Degranulation usually occurred during periods of somewhat elevated [Ca] (0.5-1 microM) following transients but was sometimes observed at [Ca]i less than or equal to 250 nM. We found no evidence that an antigen-induced Ca influx is required for degranulation.

Original language	English (US)
Pages (from-to)	51-53
Number of pages	3
Journal	The EMBO journal
Volume	5
Issue number	1
DOIs	https://doi.org/10.1002/j.1460-2075.1986.tb04176.x
State	Published - Jan 1986
Externally published	Yes

ASJC Scopus subject areas

General Neuroscience
Molecular Biology
General Biochemistry, Genetics and Molecular Biology
General Immunology and Microbiology

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10.1002/j.1460-2075.1986.tb04176.x

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abstract = "The calcium concentration, [Ca]i, in single rat peritoneal mast cells was measured by means of the new Ca indicator dye fura-2. Upon stimulation with antigen or compound 48/80, [Ca]i rose for seconds to values greater than 5 microM. These Ca transients did not depend on the presence of extracellular Ca, and they sometimes occurred spontaneously, especially in the presence of exogenous phosphatidylserine. Calcium transients did not necessarily lead to degranulation. Degranulation usually occurred during periods of somewhat elevated [Ca] (0.5-1 microM) following transients but was sometimes observed at [Ca]i less than or equal to 250 nM. We found no evidence that an antigen-induced Ca influx is required for degranulation.",

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AU - Almers, W.

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AB - The calcium concentration, [Ca]i, in single rat peritoneal mast cells was measured by means of the new Ca indicator dye fura-2. Upon stimulation with antigen or compound 48/80, [Ca]i rose for seconds to values greater than 5 microM. These Ca transients did not depend on the presence of extracellular Ca, and they sometimes occurred spontaneously, especially in the presence of exogenous phosphatidylserine. Calcium transients did not necessarily lead to degranulation. Degranulation usually occurred during periods of somewhat elevated [Ca] (0.5-1 microM) following transients but was sometimes observed at [Ca]i less than or equal to 250 nM. We found no evidence that an antigen-induced Ca influx is required for degranulation.

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Fast calcium transients in rat peritoneal mast cells are not sufficient to trigger exocytosis.

Abstract

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