Calcium-dependent release of NO from intracellular S-nitrosothiols

The paper describes a novel cellular mechanism for rapid calcium‐dependent nitric oxide (NO) release. This release occurs due to NO liberation from S ‐nitrosothiols. We have analysed the changes of NO concentration in acutely isolated pancreatic acinar cells. Supramaximal acetylcholine (ACh) stimula...

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Veröffentlicht in:The EMBO journal 2006-07, Vol.25 (13), p.3024-3032
Hauptverfasser: Chvanov, Michael, Gerasimenko, Oleg V, Petersen, Ole H, Tepikin, Alexei V
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Gerasimenko, Oleg V
Petersen, Ole H
Tepikin, Alexei V
description The paper describes a novel cellular mechanism for rapid calcium‐dependent nitric oxide (NO) release. This release occurs due to NO liberation from S ‐nitrosothiols. We have analysed the changes of NO concentration in acutely isolated pancreatic acinar cells. Supramaximal acetylcholine (ACh) stimulation induced a Ca 2+ ‐dependent increase in the fluorescence in the majority of cells loaded with the NO probe DAF‐FM via a patch pipette. The ACh‐induced NO signals were insensitive to inhibitors of calmodulin and protein kinase C but were inhibited by calpain antagonists. The initial part of the NO signals induced by 10 μM ACh showed little sensitivity to inhibition of NO synthase (NOS); however, cell pretreatment with NO donors (increasing cellular S ‐nitrosothiol contents) substantially enhanced the initial component of NO responses. Pancreatic acinar cells were able to generate fast calcium‐dependent NO responses when stimulated with physiological or supramaximal doses of secretagogues. Importantly, the source of this NO is the already available S ‐nitrosothiol store rather than de novo synthesis by NOS. A similar mechanism of NO release was found in dorsal root ganglia neurons.
doi_str_mv 10.1038/sj.emboj.7601207
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This release occurs due to NO liberation from S ‐nitrosothiols. We have analysed the changes of NO concentration in acutely isolated pancreatic acinar cells. Supramaximal acetylcholine (ACh) stimulation induced a Ca 2+ ‐dependent increase in the fluorescence in the majority of cells loaded with the NO probe DAF‐FM via a patch pipette. The ACh‐induced NO signals were insensitive to inhibitors of calmodulin and protein kinase C but were inhibited by calpain antagonists. The initial part of the NO signals induced by 10 μM ACh showed little sensitivity to inhibition of NO synthase (NOS); however, cell pretreatment with NO donors (increasing cellular S ‐nitrosothiol contents) substantially enhanced the initial component of NO responses. Pancreatic acinar cells were able to generate fast calcium‐dependent NO responses when stimulated with physiological or supramaximal doses of secretagogues. Importantly, the source of this NO is the already available S ‐nitrosothiol store rather than de novo synthesis by NOS. 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This release occurs due to NO liberation from S ‐nitrosothiols. We have analysed the changes of NO concentration in acutely isolated pancreatic acinar cells. Supramaximal acetylcholine (ACh) stimulation induced a Ca 2+ ‐dependent increase in the fluorescence in the majority of cells loaded with the NO probe DAF‐FM via a patch pipette. The ACh‐induced NO signals were insensitive to inhibitors of calmodulin and protein kinase C but were inhibited by calpain antagonists. The initial part of the NO signals induced by 10 μM ACh showed little sensitivity to inhibition of NO synthase (NOS); however, cell pretreatment with NO donors (increasing cellular S ‐nitrosothiol contents) substantially enhanced the initial component of NO responses. Pancreatic acinar cells were able to generate fast calcium‐dependent NO responses when stimulated with physiological or supramaximal doses of secretagogues. Importantly, the source of this NO is the already available S ‐nitrosothiol store rather than de novo synthesis by NOS. A similar mechanism of NO release was found in dorsal root ganglia neurons.</abstract><cop>Chichester, UK</cop><pub>John Wiley &amp; Sons, Ltd</pub><pmid>16810320</pmid><doi>10.1038/sj.emboj.7601207</doi><tpages>9</tpages><oa>free_for_read</oa></addata></record>
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subjects Acetylcholine - pharmacology
Acrylates - pharmacology
Animals
Biochemistry
Calcium
Calcium - physiology
Calmodulin - antagonists & inhibitors
Calmodulin - metabolism
Calpain - antagonists & inhibitors
Calpain - metabolism
Cells, Cultured
EMBO37
Fluoresceins
Fluorescence
Fluorescent Dyes
glutathione
Glutathione - metabolism
Intracellular Space - metabolism
Male
Mice
Neurons - cytology
Neurons - physiology
Nitric oxide
Nitric Oxide - biosynthesis
Nitric Oxide Donors - pharmacology
Nitric Oxide Synthase - antagonists & inhibitors
Nitric Oxide Synthase - metabolism
NOS
Pancreas
Pancreas - cytology
Physiology
Protein Kinase C - antagonists & inhibitors
Protein Kinase C - metabolism
S-nitrosothiols
S-Nitrosothiols - metabolism
Signal transduction
title Calcium-dependent release of NO from intracellular S-nitrosothiols
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