Role of ATP‐conductive anion channel in ATP release from neonatal rat cardiomyocytes in ischaemic or hypoxic conditions

Role of ATP‐conductive anion channel in ATP release from neonatal rat cardiomyocytes in... It is known that the level of ATP in the interstitial spaces within the heart during ischaemia or hypoxia is elevated due to its release from a number of cell types, including cardiomyocytes. However, the mechanism by which ATP is released from these myocytes is not known. In this study, we examined a possible involvement of the ATP‐conductive maxi‐anion channel in ATP release from neonatal rat cardiomyocytes in primary culture upon ischaemic, hypoxic or hypotonic stimulation. Using a luciferin–luciferase assay, it was found that ATP was released into the bulk solution when the cells were subjected to chemical ischaemia, hypoxia or hypotonic stress. The swelling‐induced ATP release was inhibited by the carboxylate‐ and stilbene‐derivative anion channel blockers, arachidonic acid and Gd3+, but not by glibenclamide. The local concentration of ATP released near the cell surface of a single cardiomyocyte, measured by a biosensor technique, was found to exceed the micromolar level. Patch‐clamp studies showed that ischaemia, hypoxia or hypotonic stimulation induced the activation of single‐channel events with a large unitary conductance (∼390 pS). The channel was selective to anions and showed significant permeability to ATP4‐ (PATP/PCl∼ 0.1) and MgATP2‐ (PATP/PCl∼ 0.16). The channel activity exhibited pharmacological properties essentially identical to those of ATP release. These results indicate that neonatal rat cardiomyocytes respond to ischaemia, hypoxia or hypotonic stimulation with ATP release via maxi‐anion channels. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png The Journal of Physiology Wiley

Role of ATP‐conductive anion channel in ATP release from neonatal rat cardiomyocytes in ischaemic or hypoxic conditions

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Publisher
Wiley
Copyright
Copyright © 2004 Wiley Subscription Services, Inc., A Wiley Company
ISSN
0022-3751
eISSN
1469-7793
DOI
10.1113/jphysiol.2004.069245
pmid
15272030
Publisher site
See Article on Publisher Site

Abstract

It is known that the level of ATP in the interstitial spaces within the heart during ischaemia or hypoxia is elevated due to its release from a number of cell types, including cardiomyocytes. However, the mechanism by which ATP is released from these myocytes is not known. In this study, we examined a possible involvement of the ATP‐conductive maxi‐anion channel in ATP release from neonatal rat cardiomyocytes in primary culture upon ischaemic, hypoxic or hypotonic stimulation. Using a luciferin–luciferase assay, it was found that ATP was released into the bulk solution when the cells were subjected to chemical ischaemia, hypoxia or hypotonic stress. The swelling‐induced ATP release was inhibited by the carboxylate‐ and stilbene‐derivative anion channel blockers, arachidonic acid and Gd3+, but not by glibenclamide. The local concentration of ATP released near the cell surface of a single cardiomyocyte, measured by a biosensor technique, was found to exceed the micromolar level. Patch‐clamp studies showed that ischaemia, hypoxia or hypotonic stimulation induced the activation of single‐channel events with a large unitary conductance (∼390 pS). The channel was selective to anions and showed significant permeability to ATP4‐ (PATP/PCl∼ 0.1) and MgATP2‐ (PATP/PCl∼ 0.16). The channel activity exhibited pharmacological properties essentially identical to those of ATP release. These results indicate that neonatal rat cardiomyocytes respond to ischaemia, hypoxia or hypotonic stimulation with ATP release via maxi‐anion channels.

Journal

The Journal of PhysiologyWiley

Published: Sep 1, 2004

References

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