Hypoxia induces intracellular [Ca.sup.2+] release by causing reactive oxygen species-mediated dissociation of FK506-binding protein 12.6 from ryanodine receptor 2 in pulmonary artery myocytes
Here we attempted to test a novel hypothesis that hypoxia may induce [Ca.sup.2+] release through reactive oxygen species (ROS)-mediated dissociation of FK506-binding protein 12.6 (FKBP12.6) from ryanodine receptors (RyRs) on the sarcoplasmic reticulum (SR) in pulmonary artery smooth muscle cells (PA...
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Veröffentlicht in: | Antioxidants & redox signaling 2011-01, Vol.14 (1), p.37 |
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creator | Liao, Bo Zheng, Yun-Min Yadav, Vishal R Korde, Amit S Wang, Yong-Xiao |
description | Here we attempted to test a novel hypothesis that hypoxia may induce [Ca.sup.2+] release through reactive oxygen species (ROS)-mediated dissociation of FK506-binding protein 12.6 (FKBP12.6) from ryanodine receptors (RyRs) on the sarcoplasmic reticulum (SR) in pulmonary artery smooth muscle cells (PASMCs). The results reveal that hypoxic exposure significantly decreased the amount of FKBP12.6 on the SR of PAs and increased FKBP12.6 in the cytosol. The colocalization of FKBP12.6 with RyRs was decreased in intact PASMCs. Pharmacological and genetic inhibition of intracellular ROS generation prevented hypoxia from decreasing FKBP12.6 on the SR and increasing FKBP12.6 in the cytosol. Exogenous ROS ([H.sub.2][O.sub.2]) reduced FKBP12.6 on the SR and augmented FKBP12.6 in the cytosol. Oxidized FKBP12.6 was absent on the SR from PAs pretreated with and without hypoxia, but it was present with a higher amount in the cytosol from PAs pretreated with than without hypoxia. Hypoxia and [H.sub.2][O.sub.2] diminished the association of FKBP12.6 from type 2 RyRs (RyR2). The activity of RyRs was increased in PAs pretreated with hypoxia or [H.sub.2][O.sub.2]. FKBP12.6 removal enhanced, whereas RyR2 gene deletion blocked the hypoxic increase in [[[Ca.sup.2+]].sub.i] in PASMCs. Collectively, we conclude that hypoxia may induce [Ca.sup.2+] release by causing ROS-mediated dissociation of FKBP12.6 from RyR2 in PASMCs. Antioxid. Redox Signal. 14, 37-47. |
doi_str_mv | 10.1089/ars.2009.3047 |
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The results reveal that hypoxic exposure significantly decreased the amount of FKBP12.6 on the SR of PAs and increased FKBP12.6 in the cytosol. The colocalization of FKBP12.6 with RyRs was decreased in intact PASMCs. Pharmacological and genetic inhibition of intracellular ROS generation prevented hypoxia from decreasing FKBP12.6 on the SR and increasing FKBP12.6 in the cytosol. Exogenous ROS ([H.sub.2][O.sub.2]) reduced FKBP12.6 on the SR and augmented FKBP12.6 in the cytosol. Oxidized FKBP12.6 was absent on the SR from PAs pretreated with and without hypoxia, but it was present with a higher amount in the cytosol from PAs pretreated with than without hypoxia. Hypoxia and [H.sub.2][O.sub.2] diminished the association of FKBP12.6 from type 2 RyRs (RyR2). The activity of RyRs was increased in PAs pretreated with hypoxia or [H.sub.2][O.sub.2]. FKBP12.6 removal enhanced, whereas RyR2 gene deletion blocked the hypoxic increase in [[[Ca.sup.2+]].sub.i] in PASMCs. Collectively, we conclude that hypoxia may induce [Ca.sup.2+] release by causing ROS-mediated dissociation of FKBP12.6 from RyR2 in PASMCs. Antioxid. Redox Signal. 14, 37-47.</description><identifier>ISSN: 1523-0864</identifier><identifier>DOI: 10.1089/ars.2009.3047</identifier><language>eng</language><publisher>Mary Ann Liebert, Inc</publisher><subject>Binding proteins ; Calcium ions ; Complications and side effects ; Hypoxia ; Physiological aspects ; Proteolysis</subject><ispartof>Antioxidants & redox signaling, 2011-01, Vol.14 (1), p.37</ispartof><rights>COPYRIGHT 2011 Mary Ann Liebert, Inc.</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,780,784,27924,27925</link.rule.ids></links><search><creatorcontrib>Liao, Bo</creatorcontrib><creatorcontrib>Zheng, Yun-Min</creatorcontrib><creatorcontrib>Yadav, Vishal R</creatorcontrib><creatorcontrib>Korde, Amit S</creatorcontrib><creatorcontrib>Wang, Yong-Xiao</creatorcontrib><title>Hypoxia induces intracellular [Ca.sup.2+] release by causing reactive oxygen species-mediated dissociation of FK506-binding protein 12.6 from ryanodine receptor 2 in pulmonary artery myocytes</title><title>Antioxidants & redox signaling</title><description>Here we attempted to test a novel hypothesis that hypoxia may induce [Ca.sup.2+] release through reactive oxygen species (ROS)-mediated dissociation of FK506-binding protein 12.6 (FKBP12.6) from ryanodine receptors (RyRs) on the sarcoplasmic reticulum (SR) in pulmonary artery smooth muscle cells (PASMCs). The results reveal that hypoxic exposure significantly decreased the amount of FKBP12.6 on the SR of PAs and increased FKBP12.6 in the cytosol. The colocalization of FKBP12.6 with RyRs was decreased in intact PASMCs. Pharmacological and genetic inhibition of intracellular ROS generation prevented hypoxia from decreasing FKBP12.6 on the SR and increasing FKBP12.6 in the cytosol. Exogenous ROS ([H.sub.2][O.sub.2]) reduced FKBP12.6 on the SR and augmented FKBP12.6 in the cytosol. Oxidized FKBP12.6 was absent on the SR from PAs pretreated with and without hypoxia, but it was present with a higher amount in the cytosol from PAs pretreated with than without hypoxia. Hypoxia and [H.sub.2][O.sub.2] diminished the association of FKBP12.6 from type 2 RyRs (RyR2). The activity of RyRs was increased in PAs pretreated with hypoxia or [H.sub.2][O.sub.2]. FKBP12.6 removal enhanced, whereas RyR2 gene deletion blocked the hypoxic increase in [[[Ca.sup.2+]].sub.i] in PASMCs. Collectively, we conclude that hypoxia may induce [Ca.sup.2+] release by causing ROS-mediated dissociation of FKBP12.6 from RyR2 in PASMCs. Antioxid. Redox Signal. 14, 37-47.</description><subject>Binding proteins</subject><subject>Calcium ions</subject><subject>Complications and side effects</subject><subject>Hypoxia</subject><subject>Physiological aspects</subject><subject>Proteolysis</subject><issn>1523-0864</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2011</creationdate><recordtype>article</recordtype><sourceid/><recordid>eNptUD1LxUAQvEJBfVraH1hK4n0kl6SUh18o2NiJyGazeZwkd-EuEfPr_GueaGEhW8wyuzO7DGOnUuRS1M0FhJgrIZpci6LaY4eyVDoTtSkO2FGMb0IIJaU4ZJ-36-Q_LHDrugUpJpwDIA3DMkDgz1vI4zLl6vyFBxoIIvF25QhLtG6XKMDZvhP3H-uOHI8ToaWYjdRZmKnjnY3RY-qtd9z3_Pq-FCZr07Fv-RT8TNZxqXLD--BHHlZwPs0oWSNNsw9cpZf4tAyjdxBWDmGmBOPqcZ0pHrP9HoZIJ7-4YU_XV0_b2-zh8eZue_mQ7UylslJT3ZBEkC1KMKZC07QFdEWjDXZt35a9NimisjFY10r3NWmjm1JWSFWNpDfs7Md2BwO9Wtf775RGG_H1UhVJWNQp4A3L_9lK1dFo0TvqbeL_CL4A5AyG4A</recordid><startdate>20110101</startdate><enddate>20110101</enddate><creator>Liao, Bo</creator><creator>Zheng, Yun-Min</creator><creator>Yadav, Vishal R</creator><creator>Korde, Amit S</creator><creator>Wang, Yong-Xiao</creator><general>Mary Ann Liebert, Inc</general><scope/></search><sort><creationdate>20110101</creationdate><title>Hypoxia induces intracellular [Ca.sup.2+] release by causing reactive oxygen species-mediated dissociation of FK506-binding protein 12.6 from ryanodine receptor 2 in pulmonary artery myocytes</title><author>Liao, Bo ; Zheng, Yun-Min ; Yadav, Vishal R ; Korde, Amit S ; Wang, Yong-Xiao</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-g672-53e89e1ca1bc1a667c69b4ad4936cdbfb5f36152596c8823f8e3639517ce78ce3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2011</creationdate><topic>Binding proteins</topic><topic>Calcium ions</topic><topic>Complications and side effects</topic><topic>Hypoxia</topic><topic>Physiological aspects</topic><topic>Proteolysis</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Liao, Bo</creatorcontrib><creatorcontrib>Zheng, Yun-Min</creatorcontrib><creatorcontrib>Yadav, Vishal R</creatorcontrib><creatorcontrib>Korde, Amit S</creatorcontrib><creatorcontrib>Wang, Yong-Xiao</creatorcontrib><jtitle>Antioxidants & redox signaling</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Liao, Bo</au><au>Zheng, Yun-Min</au><au>Yadav, Vishal R</au><au>Korde, Amit S</au><au>Wang, Yong-Xiao</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Hypoxia induces intracellular [Ca.sup.2+] release by causing reactive oxygen species-mediated dissociation of FK506-binding protein 12.6 from ryanodine receptor 2 in pulmonary artery myocytes</atitle><jtitle>Antioxidants & redox signaling</jtitle><date>2011-01-01</date><risdate>2011</risdate><volume>14</volume><issue>1</issue><spage>37</spage><pages>37-</pages><issn>1523-0864</issn><abstract>Here we attempted to test a novel hypothesis that hypoxia may induce [Ca.sup.2+] release through reactive oxygen species (ROS)-mediated dissociation of FK506-binding protein 12.6 (FKBP12.6) from ryanodine receptors (RyRs) on the sarcoplasmic reticulum (SR) in pulmonary artery smooth muscle cells (PASMCs). The results reveal that hypoxic exposure significantly decreased the amount of FKBP12.6 on the SR of PAs and increased FKBP12.6 in the cytosol. The colocalization of FKBP12.6 with RyRs was decreased in intact PASMCs. Pharmacological and genetic inhibition of intracellular ROS generation prevented hypoxia from decreasing FKBP12.6 on the SR and increasing FKBP12.6 in the cytosol. Exogenous ROS ([H.sub.2][O.sub.2]) reduced FKBP12.6 on the SR and augmented FKBP12.6 in the cytosol. Oxidized FKBP12.6 was absent on the SR from PAs pretreated with and without hypoxia, but it was present with a higher amount in the cytosol from PAs pretreated with than without hypoxia. Hypoxia and [H.sub.2][O.sub.2] diminished the association of FKBP12.6 from type 2 RyRs (RyR2). The activity of RyRs was increased in PAs pretreated with hypoxia or [H.sub.2][O.sub.2]. FKBP12.6 removal enhanced, whereas RyR2 gene deletion blocked the hypoxic increase in [[[Ca.sup.2+]].sub.i] in PASMCs. Collectively, we conclude that hypoxia may induce [Ca.sup.2+] release by causing ROS-mediated dissociation of FKBP12.6 from RyR2 in PASMCs. Antioxid. Redox Signal. 14, 37-47.</abstract><pub>Mary Ann Liebert, Inc</pub><doi>10.1089/ars.2009.3047</doi></addata></record> |
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subjects | Binding proteins Calcium ions Complications and side effects Hypoxia Physiological aspects Proteolysis |
title | Hypoxia induces intracellular [Ca.sup.2+] release by causing reactive oxygen species-mediated dissociation of FK506-binding protein 12.6 from ryanodine receptor 2 in pulmonary artery myocytes |
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