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Chronic Hypoxia Increases Endothelial Nitric Oxide Synthase Generation of Nitric Oxide by Increasing Heat Shock Protein 90 Association and Serine Phosphorylation
ABSTRACT—Chronic hypoxia increases endothelial nitric oxide synthase (eNOS) production of nitric oxide (·NO) and cardioprotection in neonatal rabbit hearts. However, the mechanism by which this occurs remains unclear. Recent studies suggest that heat shock protein 90 (hsp90) alters eNOS function. In...
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Published in: | Circulation research 2002-08, Vol.91 (4), p.300-306 |
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description | ABSTRACT—Chronic hypoxia increases endothelial nitric oxide synthase (eNOS) production of nitric oxide (·NO) and cardioprotection in neonatal rabbit hearts. However, the mechanism by which this occurs remains unclear. Recent studies suggest that heat shock protein 90 (hsp90) alters eNOS function. In the present study, we examined the role of hsp90 in eNOS-dependent cardioprotection in neonatal rabbit hearts. Chronic hypoxia increased recovery of postischemic left ventricular developed pressure (LVDP). Geldanamycin (GA), which inhibits hsp90 and increases oxidative stress, decreased functional recovery in normoxic and hypoxic hearts. To determine if a loss in ·NO, afforded by GA, decreased recovery, GA-treated hearts were perfused with S-nitrosoglutathione (GSNO) as a source of ·NO. GSNO increased recovery of postischemic LVDP in GA-treated normoxic and hypoxic hearts to baseline levels. Although chronic hypoxia decreased phosphorylated eNOS (S1177) levels by ≈4- to 5-fold and total Akt and phosphorylated Akt by 4- and 5-fold, it also increased hsp90 association with eNOS by more than 3-fold. Using hydroethidine (HEt), a fluorescent probe for superoxide, we found that hypoxic hearts contained less ethidine (Et) staining than normoxic hearts. Normoxic hearts generated 3 times more superoxide by an N-nitro-l-arginine methyl ester (L-NAME)-inhibitable mechanism than hypoxic hearts. Taken together, these data indicate that the association of hsp90 with eNOS is important for increasing ·NO production and limiting eNOS-dependent superoxide anion generation. Such changes in eNOS function appear to play a critical role in protecting the myocardium against ischemic injury. |
doi_str_mv | 10.1161/01.RES.0000031799.12850.1E |
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However, the mechanism by which this occurs remains unclear. Recent studies suggest that heat shock protein 90 (hsp90) alters eNOS function. In the present study, we examined the role of hsp90 in eNOS-dependent cardioprotection in neonatal rabbit hearts. Chronic hypoxia increased recovery of postischemic left ventricular developed pressure (LVDP). Geldanamycin (GA), which inhibits hsp90 and increases oxidative stress, decreased functional recovery in normoxic and hypoxic hearts. To determine if a loss in ·NO, afforded by GA, decreased recovery, GA-treated hearts were perfused with S-nitrosoglutathione (GSNO) as a source of ·NO. GSNO increased recovery of postischemic LVDP in GA-treated normoxic and hypoxic hearts to baseline levels. Although chronic hypoxia decreased phosphorylated eNOS (S1177) levels by ≈4- to 5-fold and total Akt and phosphorylated Akt by 4- and 5-fold, it also increased hsp90 association with eNOS by more than 3-fold. Using hydroethidine (HEt), a fluorescent probe for superoxide, we found that hypoxic hearts contained less ethidine (Et) staining than normoxic hearts. Normoxic hearts generated 3 times more superoxide by an N-nitro-l-arginine methyl ester (L-NAME)-inhibitable mechanism than hypoxic hearts. Taken together, these data indicate that the association of hsp90 with eNOS is important for increasing ·NO production and limiting eNOS-dependent superoxide anion generation. Such changes in eNOS function appear to play a critical role in protecting the myocardium against ischemic injury.</description><identifier>ISSN: 0009-7330</identifier><identifier>EISSN: 1524-4571</identifier><identifier>DOI: 10.1161/01.RES.0000031799.12850.1E</identifier><identifier>PMID: 12193462</identifier><identifier>CODEN: CIRUAL</identifier><language>eng</language><publisher>Hagerstown, MD: American Heart Association, Inc</publisher><subject>Animals ; Animals, Newborn ; Benzoquinones ; Biological and medical sciences ; Blotting, Western ; Cardiology. Vascular system ; Chronic Disease ; Coronary heart disease ; Enzyme Activation - drug effects ; Enzyme Inhibitors - pharmacology ; Fluorescent Dyes ; Heart ; HSP90 Heat-Shock Proteins - antagonists & inhibitors ; HSP90 Heat-Shock Proteins - metabolism ; Hypoxia - complications ; Hypoxia - metabolism ; In Vitro Techniques ; Lactams, Macrocyclic ; Medical sciences ; Myocardial Ischemia - complications ; Myocardial Ischemia - metabolism ; Nitric Oxide - metabolism ; Nitric Oxide Synthase - antagonists & inhibitors ; Nitric Oxide Synthase - metabolism ; Nitric Oxide Synthase Type III ; Oxidative Stress - drug effects ; Phosphorylation - drug effects ; Protein Binding ; Protein-Serine-Threonine Kinases ; Proto-Oncogene Proteins - metabolism ; Proto-Oncogene Proteins c-akt ; Quinones - pharmacology ; Rabbits ; Recovery of Function - drug effects ; Serine - metabolism ; Superoxides - metabolism ; Ventricular Function, Left - drug effects</subject><ispartof>Circulation research, 2002-08, Vol.91 (4), p.300-306</ispartof><rights>2002 American Heart Association, Inc.</rights><rights>2002 INIST-CNRS</rights><rights>Copyright American Heart Association, Inc. Aug 23, 2002</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c5716-3dc0d179c910d43b68652d463c2acba811f25add94ffc7e55a219962480ee3ec3</citedby><cites>FETCH-LOGICAL-c5716-3dc0d179c910d43b68652d463c2acba811f25add94ffc7e55a219962480ee3ec3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,780,784,27924,27925</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=13884690$$DView record in Pascal Francis$$Hfree_for_read</backlink><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/12193462$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink></links><search><creatorcontrib>Shi, Yang</creatorcontrib><creatorcontrib>Baker, John E</creatorcontrib><creatorcontrib>Zhang, Chenyang</creatorcontrib><creatorcontrib>Tweddell, James S</creatorcontrib><creatorcontrib>Su, Jidong</creatorcontrib><creatorcontrib>Pritchard, Kirkwood A</creatorcontrib><title>Chronic Hypoxia Increases Endothelial Nitric Oxide Synthase Generation of Nitric Oxide by Increasing Heat Shock Protein 90 Association and Serine Phosphorylation</title><title>Circulation research</title><addtitle>Circ Res</addtitle><description>ABSTRACT—Chronic hypoxia increases endothelial nitric oxide synthase (eNOS) production of nitric oxide (·NO) and cardioprotection in neonatal rabbit hearts. However, the mechanism by which this occurs remains unclear. Recent studies suggest that heat shock protein 90 (hsp90) alters eNOS function. In the present study, we examined the role of hsp90 in eNOS-dependent cardioprotection in neonatal rabbit hearts. Chronic hypoxia increased recovery of postischemic left ventricular developed pressure (LVDP). Geldanamycin (GA), which inhibits hsp90 and increases oxidative stress, decreased functional recovery in normoxic and hypoxic hearts. To determine if a loss in ·NO, afforded by GA, decreased recovery, GA-treated hearts were perfused with S-nitrosoglutathione (GSNO) as a source of ·NO. GSNO increased recovery of postischemic LVDP in GA-treated normoxic and hypoxic hearts to baseline levels. Although chronic hypoxia decreased phosphorylated eNOS (S1177) levels by ≈4- to 5-fold and total Akt and phosphorylated Akt by 4- and 5-fold, it also increased hsp90 association with eNOS by more than 3-fold. Using hydroethidine (HEt), a fluorescent probe for superoxide, we found that hypoxic hearts contained less ethidine (Et) staining than normoxic hearts. Normoxic hearts generated 3 times more superoxide by an N-nitro-l-arginine methyl ester (L-NAME)-inhibitable mechanism than hypoxic hearts. Taken together, these data indicate that the association of hsp90 with eNOS is important for increasing ·NO production and limiting eNOS-dependent superoxide anion generation. Such changes in eNOS function appear to play a critical role in protecting the myocardium against ischemic injury.</description><subject>Animals</subject><subject>Animals, Newborn</subject><subject>Benzoquinones</subject><subject>Biological and medical sciences</subject><subject>Blotting, Western</subject><subject>Cardiology. Vascular system</subject><subject>Chronic Disease</subject><subject>Coronary heart disease</subject><subject>Enzyme Activation - drug effects</subject><subject>Enzyme Inhibitors - pharmacology</subject><subject>Fluorescent Dyes</subject><subject>Heart</subject><subject>HSP90 Heat-Shock Proteins - antagonists & inhibitors</subject><subject>HSP90 Heat-Shock Proteins - metabolism</subject><subject>Hypoxia - complications</subject><subject>Hypoxia - metabolism</subject><subject>In Vitro Techniques</subject><subject>Lactams, Macrocyclic</subject><subject>Medical sciences</subject><subject>Myocardial Ischemia - complications</subject><subject>Myocardial Ischemia - metabolism</subject><subject>Nitric Oxide - metabolism</subject><subject>Nitric Oxide Synthase - antagonists & inhibitors</subject><subject>Nitric Oxide Synthase - metabolism</subject><subject>Nitric Oxide Synthase Type III</subject><subject>Oxidative Stress - drug effects</subject><subject>Phosphorylation - drug effects</subject><subject>Protein Binding</subject><subject>Protein-Serine-Threonine Kinases</subject><subject>Proto-Oncogene Proteins - metabolism</subject><subject>Proto-Oncogene Proteins c-akt</subject><subject>Quinones - pharmacology</subject><subject>Rabbits</subject><subject>Recovery of Function - drug effects</subject><subject>Serine - metabolism</subject><subject>Superoxides - metabolism</subject><subject>Ventricular Function, Left - drug effects</subject><issn>0009-7330</issn><issn>1524-4571</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2002</creationdate><recordtype>article</recordtype><recordid>eNpdkd1u1DAQhSMEokvhFZBVCe6yeGznj7tqFbqVKlqxcG15nQlxm7UXO1Gbx-FN6_2pVuAbSz7fmRnPSZILoHOAHL5QmP-oV3O6OxyKqpoDK7Mo1q-SGWRMpCIr4HUyi3qVFpzTs-RdCPeUguCsepucAYOKi5zNkr-LzjtrNFlOW_dkFLm22qMKGEhtGzd02BvVk-9m8BG6fTINktVkhy4i5AotejUYZ4lr_2XW00slY3-TJaqBrDqnH8iddwMaSypKLkNw2hz8yjZkhd5YJHedC9vO-anfS--TN63qA3443ufJr2_1z8Uyvbm9ul5c3qQ6fjZPeaNpE5ehK6CN4Ou8zDPWiJxrpvRalQAty1TTVKJtdYFZpuIOqpyJkiJy1Pw8-Xyou_Xuz4hhkBsTNPa9sujGIAtGmcgriODFf-C9G72Ns0kGTDCWFzvo6wHS3oXgsZVbbzbKTxKo3KUoKciYojylKPcpSqij-eOxw7jeYHOyHmOLwKcjoIJWfeuV1SacOF6WcVQaOXHgHl0_oA8P_fiIXnao-qHbt-YUWMooZbRknKa7p5w_A3Vsts8</recordid><startdate>20020823</startdate><enddate>20020823</enddate><creator>Shi, Yang</creator><creator>Baker, John E</creator><creator>Zhang, Chenyang</creator><creator>Tweddell, James S</creator><creator>Su, Jidong</creator><creator>Pritchard, Kirkwood A</creator><general>American Heart Association, Inc</general><general>Lippincott</general><general>Lippincott Williams & Wilkins Ovid Technologies</general><scope>IQODW</scope><scope>CGR</scope><scope>CUY</scope><scope>CVF</scope><scope>ECM</scope><scope>EIF</scope><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7QP</scope><scope>7T5</scope><scope>7TK</scope><scope>H94</scope><scope>K9.</scope><scope>7X8</scope></search><sort><creationdate>20020823</creationdate><title>Chronic Hypoxia Increases Endothelial Nitric Oxide Synthase Generation of Nitric Oxide by Increasing Heat Shock Protein 90 Association and Serine Phosphorylation</title><author>Shi, Yang ; Baker, John E ; Zhang, Chenyang ; Tweddell, James S ; Su, Jidong ; Pritchard, Kirkwood A</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c5716-3dc0d179c910d43b68652d463c2acba811f25add94ffc7e55a219962480ee3ec3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2002</creationdate><topic>Animals</topic><topic>Animals, Newborn</topic><topic>Benzoquinones</topic><topic>Biological and medical sciences</topic><topic>Blotting, Western</topic><topic>Cardiology. Vascular system</topic><topic>Chronic Disease</topic><topic>Coronary heart disease</topic><topic>Enzyme Activation - drug effects</topic><topic>Enzyme Inhibitors - pharmacology</topic><topic>Fluorescent Dyes</topic><topic>Heart</topic><topic>HSP90 Heat-Shock Proteins - antagonists & inhibitors</topic><topic>HSP90 Heat-Shock Proteins - metabolism</topic><topic>Hypoxia - complications</topic><topic>Hypoxia - metabolism</topic><topic>In Vitro Techniques</topic><topic>Lactams, Macrocyclic</topic><topic>Medical sciences</topic><topic>Myocardial Ischemia - complications</topic><topic>Myocardial Ischemia - metabolism</topic><topic>Nitric Oxide - metabolism</topic><topic>Nitric Oxide Synthase - antagonists & inhibitors</topic><topic>Nitric Oxide Synthase - metabolism</topic><topic>Nitric Oxide Synthase Type III</topic><topic>Oxidative Stress - drug effects</topic><topic>Phosphorylation - drug effects</topic><topic>Protein Binding</topic><topic>Protein-Serine-Threonine Kinases</topic><topic>Proto-Oncogene Proteins - metabolism</topic><topic>Proto-Oncogene Proteins c-akt</topic><topic>Quinones - pharmacology</topic><topic>Rabbits</topic><topic>Recovery of Function - drug effects</topic><topic>Serine - metabolism</topic><topic>Superoxides - metabolism</topic><topic>Ventricular Function, Left - drug effects</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Shi, Yang</creatorcontrib><creatorcontrib>Baker, John E</creatorcontrib><creatorcontrib>Zhang, Chenyang</creatorcontrib><creatorcontrib>Tweddell, James S</creatorcontrib><creatorcontrib>Su, Jidong</creatorcontrib><creatorcontrib>Pritchard, Kirkwood A</creatorcontrib><collection>Pascal-Francis</collection><collection>Medline</collection><collection>MEDLINE</collection><collection>MEDLINE (Ovid)</collection><collection>MEDLINE</collection><collection>MEDLINE</collection><collection>PubMed</collection><collection>CrossRef</collection><collection>Calcium & Calcified Tissue Abstracts</collection><collection>Immunology Abstracts</collection><collection>Neurosciences Abstracts</collection><collection>AIDS and Cancer Research Abstracts</collection><collection>ProQuest Health & Medical Complete (Alumni)</collection><collection>MEDLINE - Academic</collection><jtitle>Circulation research</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Shi, Yang</au><au>Baker, John E</au><au>Zhang, Chenyang</au><au>Tweddell, James S</au><au>Su, Jidong</au><au>Pritchard, Kirkwood A</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Chronic Hypoxia Increases Endothelial Nitric Oxide Synthase Generation of Nitric Oxide by Increasing Heat Shock Protein 90 Association and Serine Phosphorylation</atitle><jtitle>Circulation research</jtitle><addtitle>Circ Res</addtitle><date>2002-08-23</date><risdate>2002</risdate><volume>91</volume><issue>4</issue><spage>300</spage><epage>306</epage><pages>300-306</pages><issn>0009-7330</issn><eissn>1524-4571</eissn><coden>CIRUAL</coden><abstract>ABSTRACT—Chronic hypoxia increases endothelial nitric oxide synthase (eNOS) production of nitric oxide (·NO) and cardioprotection in neonatal rabbit hearts. However, the mechanism by which this occurs remains unclear. Recent studies suggest that heat shock protein 90 (hsp90) alters eNOS function. In the present study, we examined the role of hsp90 in eNOS-dependent cardioprotection in neonatal rabbit hearts. Chronic hypoxia increased recovery of postischemic left ventricular developed pressure (LVDP). Geldanamycin (GA), which inhibits hsp90 and increases oxidative stress, decreased functional recovery in normoxic and hypoxic hearts. To determine if a loss in ·NO, afforded by GA, decreased recovery, GA-treated hearts were perfused with S-nitrosoglutathione (GSNO) as a source of ·NO. GSNO increased recovery of postischemic LVDP in GA-treated normoxic and hypoxic hearts to baseline levels. Although chronic hypoxia decreased phosphorylated eNOS (S1177) levels by ≈4- to 5-fold and total Akt and phosphorylated Akt by 4- and 5-fold, it also increased hsp90 association with eNOS by more than 3-fold. Using hydroethidine (HEt), a fluorescent probe for superoxide, we found that hypoxic hearts contained less ethidine (Et) staining than normoxic hearts. Normoxic hearts generated 3 times more superoxide by an N-nitro-l-arginine methyl ester (L-NAME)-inhibitable mechanism than hypoxic hearts. Taken together, these data indicate that the association of hsp90 with eNOS is important for increasing ·NO production and limiting eNOS-dependent superoxide anion generation. Such changes in eNOS function appear to play a critical role in protecting the myocardium against ischemic injury.</abstract><cop>Hagerstown, MD</cop><pub>American Heart Association, Inc</pub><pmid>12193462</pmid><doi>10.1161/01.RES.0000031799.12850.1E</doi><tpages>7</tpages><oa>free_for_read</oa></addata></record> |
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subjects | Animals Animals, Newborn Benzoquinones Biological and medical sciences Blotting, Western Cardiology. Vascular system Chronic Disease Coronary heart disease Enzyme Activation - drug effects Enzyme Inhibitors - pharmacology Fluorescent Dyes Heart HSP90 Heat-Shock Proteins - antagonists & inhibitors HSP90 Heat-Shock Proteins - metabolism Hypoxia - complications Hypoxia - metabolism In Vitro Techniques Lactams, Macrocyclic Medical sciences Myocardial Ischemia - complications Myocardial Ischemia - metabolism Nitric Oxide - metabolism Nitric Oxide Synthase - antagonists & inhibitors Nitric Oxide Synthase - metabolism Nitric Oxide Synthase Type III Oxidative Stress - drug effects Phosphorylation - drug effects Protein Binding Protein-Serine-Threonine Kinases Proto-Oncogene Proteins - metabolism Proto-Oncogene Proteins c-akt Quinones - pharmacology Rabbits Recovery of Function - drug effects Serine - metabolism Superoxides - metabolism Ventricular Function, Left - drug effects |
title | Chronic Hypoxia Increases Endothelial Nitric Oxide Synthase Generation of Nitric Oxide by Increasing Heat Shock Protein 90 Association and Serine Phosphorylation |
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