Pannexin-I/P2X 7 Purinergic Receptor Channels Mediate the Release of Cardioprotectants Induced by Ischemic Pre- and Postconditioning

Ischemic pre- and postconditioning protect ex vivo rat hearts from ischemia/reperfusion injury by promoting the release of cardioprotective agents by an unknown mechanism. Because P2X 7 purinergic receptors are known to combine with pannexin-1 to form channels that allow adenosine triphosphate (ATP)...

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Veröffentlicht in:Journal of cardiovascular pharmacology and therapeutics 2010-06, Vol.15 (2), p.190-195
Hauptverfasser: Vessey, Donald A., Li, Luyi, Kelley, Michael
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container_title Journal of cardiovascular pharmacology and therapeutics
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creator Vessey, Donald A.
Li, Luyi
Kelley, Michael
description Ischemic pre- and postconditioning protect ex vivo rat hearts from ischemia/reperfusion injury by promoting the release of cardioprotective agents by an unknown mechanism. Because P2X 7 purinergic receptors are known to combine with pannexin-1 to form channels that allow adenosine triphosphate (ATP) release from cells, we hypothesized that these channels have a role in the release of multiple cardioprotectants during ischemic preconditioning (IPC). Addition of either a pannexin-1 hemichannel blocker (5 μmol/L carbenoxolone [CBX] or 0.4 μmol/L mefloquine [MF]) or a selective antagonist of the rat P2X7 purinergic receptor (2 μmol/L brilliant blue G [BBG]) blocked IPC. These antagonists also blocked ischemic postconditioning. Preconditioning by exogenous addition of either sphingosine-1-phosphate or adenosine was not blocked by either CBX or BBG, indicating that they only affected the release of endogenous mediators, not any subsequent steps. To determine if only ATP release was mediated by pannexin-1/P2X7 channels, we added an extra cycle of IPC to release sufficient quantities of additional cardioprotectants to eliminate the dependence on adenosine derivatives. This did not override the inhibition of IPC by CBX or MF, suggesting that the channel mediates the release of multiple cardioprotectants. Inhibitors of other P2X receptors, P2Y receptors, or connexins did not affect IPC. We conclude that a pannexin-1/P2X7 channel is responsible for the release of cardioprotectants induced by ischemic pre- and postconditioning.
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To determine if only ATP release was mediated by pannexin-1/P2X7 channels, we added an extra cycle of IPC to release sufficient quantities of additional cardioprotectants to eliminate the dependence on adenosine derivatives. This did not override the inhibition of IPC by CBX or MF, suggesting that the channel mediates the release of multiple cardioprotectants. Inhibitors of other P2X receptors, P2Y receptors, or connexins did not affect IPC. 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To determine if only ATP release was mediated by pannexin-1/P2X7 channels, we added an extra cycle of IPC to release sufficient quantities of additional cardioprotectants to eliminate the dependence on adenosine derivatives. This did not override the inhibition of IPC by CBX or MF, suggesting that the channel mediates the release of multiple cardioprotectants. Inhibitors of other P2X receptors, P2Y receptors, or connexins did not affect IPC. 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Li, Luyi ; Kelley, Michael</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c3256-cd34c38bda27f88e199188a552a27ef7c3586c6d0e7d76d0153c025ba2ee04b03</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2010</creationdate><topic>Adenosine - pharmacology</topic><topic>Adenosine Triphosphate - metabolism</topic><topic>Animals</topic><topic>Carbenoxolone - pharmacology</topic><topic>Connexins - antagonists &amp; inhibitors</topic><topic>Connexins - metabolism</topic><topic>Ischemic Preconditioning, Myocardial</topic><topic>Lysophospholipids - pharmacology</topic><topic>Mefloquine - pharmacology</topic><topic>Myocardial Reperfusion Injury - metabolism</topic><topic>Nerve Tissue Proteins - antagonists &amp; inhibitors</topic><topic>Nerve Tissue Proteins - metabolism</topic><topic>Purinergic P2 Receptor Antagonists</topic><topic>Rats</topic><topic>Receptors, Purinergic P2 - metabolism</topic><topic>Receptors, Purinergic P2X7</topic><topic>Rosaniline Dyes - pharmacology</topic><topic>Sphingosine - analogs &amp; derivatives</topic><topic>Sphingosine - pharmacology</topic><toplevel>online_resources</toplevel><creatorcontrib>Vessey, Donald A.</creatorcontrib><creatorcontrib>Li, Luyi</creatorcontrib><creatorcontrib>Kelley, Michael</creatorcontrib><collection>Medline</collection><collection>MEDLINE</collection><collection>MEDLINE (Ovid)</collection><collection>MEDLINE</collection><collection>MEDLINE</collection><collection>PubMed</collection><collection>CrossRef</collection><collection>MEDLINE - Academic</collection><collection>Nucleic Acids Abstracts</collection><jtitle>Journal of cardiovascular pharmacology and therapeutics</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext_linktorsrc</fulltext></delivery><addata><au>Vessey, Donald A.</au><au>Li, Luyi</au><au>Kelley, Michael</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Pannexin-I/P2X 7 Purinergic Receptor Channels Mediate the Release of Cardioprotectants Induced by Ischemic Pre- and Postconditioning</atitle><jtitle>Journal of cardiovascular pharmacology and therapeutics</jtitle><addtitle>J Cardiovasc Pharmacol Ther</addtitle><date>2010-06</date><risdate>2010</risdate><volume>15</volume><issue>2</issue><spage>190</spage><epage>195</epage><pages>190-195</pages><issn>1074-2484</issn><eissn>1940-4034</eissn><abstract>Ischemic pre- and postconditioning protect ex vivo rat hearts from ischemia/reperfusion injury by promoting the release of cardioprotective agents by an unknown mechanism. Because P2X 7 purinergic receptors are known to combine with pannexin-1 to form channels that allow adenosine triphosphate (ATP) release from cells, we hypothesized that these channels have a role in the release of multiple cardioprotectants during ischemic preconditioning (IPC). Addition of either a pannexin-1 hemichannel blocker (5 μmol/L carbenoxolone [CBX] or 0.4 μmol/L mefloquine [MF]) or a selective antagonist of the rat P2X7 purinergic receptor (2 μmol/L brilliant blue G [BBG]) blocked IPC. These antagonists also blocked ischemic postconditioning. Preconditioning by exogenous addition of either sphingosine-1-phosphate or adenosine was not blocked by either CBX or BBG, indicating that they only affected the release of endogenous mediators, not any subsequent steps. To determine if only ATP release was mediated by pannexin-1/P2X7 channels, we added an extra cycle of IPC to release sufficient quantities of additional cardioprotectants to eliminate the dependence on adenosine derivatives. This did not override the inhibition of IPC by CBX or MF, suggesting that the channel mediates the release of multiple cardioprotectants. Inhibitors of other P2X receptors, P2Y receptors, or connexins did not affect IPC. We conclude that a pannexin-1/P2X7 channel is responsible for the release of cardioprotectants induced by ischemic pre- and postconditioning.</abstract><cop>Los Angeles, CA</cop><pub>SAGE Publications</pub><pmid>20200324</pmid><doi>10.1177/1074248409360356</doi><tpages>6</tpages><oa>free_for_read</oa></addata></record>
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ispartof Journal of cardiovascular pharmacology and therapeutics, 2010-06, Vol.15 (2), p.190-195
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subjects Adenosine - pharmacology
Adenosine Triphosphate - metabolism
Animals
Carbenoxolone - pharmacology
Connexins - antagonists & inhibitors
Connexins - metabolism
Ischemic Preconditioning, Myocardial
Lysophospholipids - pharmacology
Mefloquine - pharmacology
Myocardial Reperfusion Injury - metabolism
Nerve Tissue Proteins - antagonists & inhibitors
Nerve Tissue Proteins - metabolism
Purinergic P2 Receptor Antagonists
Rats
Receptors, Purinergic P2 - metabolism
Receptors, Purinergic P2X7
Rosaniline Dyes - pharmacology
Sphingosine - analogs & derivatives
Sphingosine - pharmacology
title Pannexin-I/P2X 7 Purinergic Receptor Channels Mediate the Release of Cardioprotectants Induced by Ischemic Pre- and Postconditioning
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