Effects of anoxic stress on prostaglandin H synthase isoforms in piglet brain
We examined effects of ischemia and asphyxia on levels of prostaglandin H synthase-1 (PGHS-1) and prostaglandin H synthase-2 (PGHS-2) in piglet brain. Ischemia was induced by increasing intracranial pressure and asphyxia was induced by turning off the respirator. Duration of anoxic stress was 10 min...
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Veröffentlicht in: | Brain research. Developmental brain research 1998-05, Vol.107 (2), p.265-276 |
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description | We examined effects of ischemia and asphyxia on levels of prostaglandin H synthase-1 (PGHS-1) and prostaglandin H synthase-2 (PGHS-2) in piglet brain. Ischemia was induced by increasing intracranial pressure and asphyxia was induced by turning off the respirator. Duration of anoxic stress was 10 min. In some animals, indomethacin (5 mg/kg, i.v.) or 7-nitroindazole (7-NI) was administered prior to ischemia to block PGHS or brain nitric oxide synthase (bNOS), respectively. Tissues from cerebral cortex and hippocampus were removed and fixed and/or frozen after 1, 2, 4 and 8 h of recovery from anoxic stress. In addition, tissues were obtained from untreated animals or from time control animals. Levels of mRNA and proteins were determined using RNase protection assay and immunohistochemical approaches, respectively. In the tissues studied, only a few neurons were immunopositive for PGHS-1, and neither ischemia or asphyxia affected PGHS-1 immunostaining at 8 h after recovery. Likewise, PGHS-1 mRNA did not increase following anoxic stress. In contrast, substantial PGHS-2 immunoreactivity was present in neurons and glial cells in the cerebral cortex and hippocampus and there was no difference between time control and non treated animals. PGHS-2 mRNA increased by 2–4 h after ischemia, and heightened immunoreactivity for PGHS-2 was present at 8 h after ischemia in cerebral cortex and hippocampus. However, asphyxia did not increase PGHS-2 mRNA or immunostaining. Indomethacin pretreatment inhibited increases in mRNA and protein for PGHS-2 after ischemia, while 7-NI had little effect on increases in PGHS-2 immunoreactivity. We conclude that: (1) PGHS-2 is the predominant isoform present in piglet cerebral cortex and hippocampus; (2) Ischemia but not asphyxia increases levels of PGHS-2; (3) Ischemia does not increase levels of PGHS-1; and (4) Indomethacin but not 7-NI attenuates ischemia-induced increases in PGHS-2. |
doi_str_mv | 10.1016/S0165-3806(98)00022-4 |
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Ischemia was induced by increasing intracranial pressure and asphyxia was induced by turning off the respirator. Duration of anoxic stress was 10 min. In some animals, indomethacin (5 mg/kg, i.v.) or 7-nitroindazole (7-NI) was administered prior to ischemia to block PGHS or brain nitric oxide synthase (bNOS), respectively. Tissues from cerebral cortex and hippocampus were removed and fixed and/or frozen after 1, 2, 4 and 8 h of recovery from anoxic stress. In addition, tissues were obtained from untreated animals or from time control animals. Levels of mRNA and proteins were determined using RNase protection assay and immunohistochemical approaches, respectively. In the tissues studied, only a few neurons were immunopositive for PGHS-1, and neither ischemia or asphyxia affected PGHS-1 immunostaining at 8 h after recovery. Likewise, PGHS-1 mRNA did not increase following anoxic stress. In contrast, substantial PGHS-2 immunoreactivity was present in neurons and glial cells in the cerebral cortex and hippocampus and there was no difference between time control and non treated animals. PGHS-2 mRNA increased by 2–4 h after ischemia, and heightened immunoreactivity for PGHS-2 was present at 8 h after ischemia in cerebral cortex and hippocampus. However, asphyxia did not increase PGHS-2 mRNA or immunostaining. Indomethacin pretreatment inhibited increases in mRNA and protein for PGHS-2 after ischemia, while 7-NI had little effect on increases in PGHS-2 immunoreactivity. We conclude that: (1) PGHS-2 is the predominant isoform present in piglet cerebral cortex and hippocampus; (2) Ischemia but not asphyxia increases levels of PGHS-2; (3) Ischemia does not increase levels of PGHS-1; and (4) Indomethacin but not 7-NI attenuates ischemia-induced increases in PGHS-2.</description><identifier>ISSN: 0165-3806</identifier><identifier>DOI: 10.1016/S0165-3806(98)00022-4</identifier><identifier>PMID: 9593932</identifier><language>eng</language><publisher>Netherlands: Elsevier B.V</publisher><subject>Animals ; Asphyxia ; Body Temperature ; Brain - enzymology ; Cerebellum ; Cerebral cortex ; Cerebral Cortex - drug effects ; Cerebral Cortex - enzymology ; Cyclooxygenase ; Cyclooxygenase Inhibitors - pharmacology ; Enzyme Inhibitors - pharmacology ; Female ; Hippocampus ; Hippocampus - drug effects ; Hippocampus - enzymology ; Hypoxia, Brain - enzymology ; Immunohistochemistry ; Indazoles - pharmacology ; Indomethacin ; Indomethacin - pharmacology ; Ischemia ; Isoenzymes - biosynthesis ; Male ; Nitric oxide synthase ; Nitric Oxide Synthase - antagonists & inhibitors ; Prostaglandin H synthase-1 ; Prostaglandin H synthase-2 ; Prostaglandin-Endoperoxide Synthases - biosynthesis ; Ribonucleases - metabolism ; Swine</subject><ispartof>Brain research. Developmental brain research, 1998-05, Vol.107 (2), p.265-276</ispartof><rights>1998 Elsevier Science B.V.</rights><rights>Copyright 1998 Elsevier Science B.V.</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c391t-11d978f9a14e9bfeac280b9b4b334fea2fb4ca99be05160f432fe3ac310296083</citedby><cites>FETCH-LOGICAL-c391t-11d978f9a14e9bfeac280b9b4b334fea2fb4ca99be05160f432fe3ac310296083</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,776,780,27901,27902</link.rule.ids><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/9593932$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink></links><search><creatorcontrib>Dégı̀, Rózsa</creatorcontrib><creatorcontrib>Bari, Ferenc</creatorcontrib><creatorcontrib>Thrikawala, Nishadi</creatorcontrib><creatorcontrib>Beasley, Tracy C</creatorcontrib><creatorcontrib>Thore, Clara</creatorcontrib><creatorcontrib>Louis, Thomas M</creatorcontrib><creatorcontrib>Busija, David W</creatorcontrib><title>Effects of anoxic stress on prostaglandin H synthase isoforms in piglet brain</title><title>Brain research. Developmental brain research</title><addtitle>Brain Res Dev Brain Res</addtitle><description>We examined effects of ischemia and asphyxia on levels of prostaglandin H synthase-1 (PGHS-1) and prostaglandin H synthase-2 (PGHS-2) in piglet brain. Ischemia was induced by increasing intracranial pressure and asphyxia was induced by turning off the respirator. Duration of anoxic stress was 10 min. In some animals, indomethacin (5 mg/kg, i.v.) or 7-nitroindazole (7-NI) was administered prior to ischemia to block PGHS or brain nitric oxide synthase (bNOS), respectively. Tissues from cerebral cortex and hippocampus were removed and fixed and/or frozen after 1, 2, 4 and 8 h of recovery from anoxic stress. In addition, tissues were obtained from untreated animals or from time control animals. Levels of mRNA and proteins were determined using RNase protection assay and immunohistochemical approaches, respectively. In the tissues studied, only a few neurons were immunopositive for PGHS-1, and neither ischemia or asphyxia affected PGHS-1 immunostaining at 8 h after recovery. Likewise, PGHS-1 mRNA did not increase following anoxic stress. In contrast, substantial PGHS-2 immunoreactivity was present in neurons and glial cells in the cerebral cortex and hippocampus and there was no difference between time control and non treated animals. PGHS-2 mRNA increased by 2–4 h after ischemia, and heightened immunoreactivity for PGHS-2 was present at 8 h after ischemia in cerebral cortex and hippocampus. However, asphyxia did not increase PGHS-2 mRNA or immunostaining. Indomethacin pretreatment inhibited increases in mRNA and protein for PGHS-2 after ischemia, while 7-NI had little effect on increases in PGHS-2 immunoreactivity. We conclude that: (1) PGHS-2 is the predominant isoform present in piglet cerebral cortex and hippocampus; (2) Ischemia but not asphyxia increases levels of PGHS-2; (3) Ischemia does not increase levels of PGHS-1; and (4) Indomethacin but not 7-NI attenuates ischemia-induced increases in PGHS-2.</description><subject>Animals</subject><subject>Asphyxia</subject><subject>Body Temperature</subject><subject>Brain - enzymology</subject><subject>Cerebellum</subject><subject>Cerebral cortex</subject><subject>Cerebral Cortex - drug effects</subject><subject>Cerebral Cortex - enzymology</subject><subject>Cyclooxygenase</subject><subject>Cyclooxygenase Inhibitors - pharmacology</subject><subject>Enzyme Inhibitors - pharmacology</subject><subject>Female</subject><subject>Hippocampus</subject><subject>Hippocampus - drug effects</subject><subject>Hippocampus - enzymology</subject><subject>Hypoxia, Brain - enzymology</subject><subject>Immunohistochemistry</subject><subject>Indazoles - pharmacology</subject><subject>Indomethacin</subject><subject>Indomethacin - pharmacology</subject><subject>Ischemia</subject><subject>Isoenzymes - biosynthesis</subject><subject>Male</subject><subject>Nitric oxide synthase</subject><subject>Nitric Oxide Synthase - antagonists & inhibitors</subject><subject>Prostaglandin H synthase-1</subject><subject>Prostaglandin H synthase-2</subject><subject>Prostaglandin-Endoperoxide Synthases - biosynthesis</subject><subject>Ribonucleases - metabolism</subject><subject>Swine</subject><issn>0165-3806</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1998</creationdate><recordtype>article</recordtype><sourceid>EIF</sourceid><recordid>eNqFkEtPAyEUhVloaq3-hCasjC5GecwDVsY01ZrUuFDXBJhLxXRmKkyN_fdS23TbDYRzzn3wITSm5JYSWt69paPIuCDltRQ3hBDGsvwEDQ_yGTqP8SsZlAs6QANZSC45G6KXqXNg-4g7h3Xb_XqLYx8gJqHFq9DFXi-Wuq19i2c4btr-U0fAPnauC03ESV75xRJ6bIL27QU6dXoZ4XJ_j9DH4_R9Msvmr0_Pk4d5ZrmkfUZpLSvhpKY5SONAWyaIkSY3nOfpyZzJrZbSACloSVzOmQOuLaeEyZIIPkJXu75pw-81xF41PlpYpk2hW0dVSVHxgrKjQVrmFSGCpGCxC9r05xjAqVXwjQ4bRYnaMlb_jNUWppJC_TNWeaob7wesTQP1oWoPOPn3Ox8Sjh8PQUXrobVQ-5C4q7rzRyb8AXTUjcg</recordid><startdate>19980515</startdate><enddate>19980515</enddate><creator>Dégı̀, Rózsa</creator><creator>Bari, Ferenc</creator><creator>Thrikawala, Nishadi</creator><creator>Beasley, Tracy C</creator><creator>Thore, Clara</creator><creator>Louis, Thomas M</creator><creator>Busija, David W</creator><general>Elsevier B.V</general><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>7TK</scope><scope>7X8</scope></search><sort><creationdate>19980515</creationdate><title>Effects of anoxic stress on prostaglandin H synthase isoforms in piglet brain</title><author>Dégı̀, Rózsa ; Bari, Ferenc ; Thrikawala, Nishadi ; Beasley, Tracy C ; Thore, Clara ; Louis, Thomas M ; Busija, David W</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c391t-11d978f9a14e9bfeac280b9b4b334fea2fb4ca99be05160f432fe3ac310296083</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>1998</creationdate><topic>Animals</topic><topic>Asphyxia</topic><topic>Body Temperature</topic><topic>Brain - enzymology</topic><topic>Cerebellum</topic><topic>Cerebral cortex</topic><topic>Cerebral Cortex - drug effects</topic><topic>Cerebral Cortex - enzymology</topic><topic>Cyclooxygenase</topic><topic>Cyclooxygenase Inhibitors - pharmacology</topic><topic>Enzyme Inhibitors - pharmacology</topic><topic>Female</topic><topic>Hippocampus</topic><topic>Hippocampus - drug effects</topic><topic>Hippocampus - enzymology</topic><topic>Hypoxia, Brain - enzymology</topic><topic>Immunohistochemistry</topic><topic>Indazoles - pharmacology</topic><topic>Indomethacin</topic><topic>Indomethacin - pharmacology</topic><topic>Ischemia</topic><topic>Isoenzymes - biosynthesis</topic><topic>Male</topic><topic>Nitric oxide synthase</topic><topic>Nitric Oxide Synthase - antagonists & inhibitors</topic><topic>Prostaglandin H synthase-1</topic><topic>Prostaglandin H synthase-2</topic><topic>Prostaglandin-Endoperoxide Synthases - biosynthesis</topic><topic>Ribonucleases - metabolism</topic><topic>Swine</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Dégı̀, Rózsa</creatorcontrib><creatorcontrib>Bari, Ferenc</creatorcontrib><creatorcontrib>Thrikawala, Nishadi</creatorcontrib><creatorcontrib>Beasley, Tracy C</creatorcontrib><creatorcontrib>Thore, Clara</creatorcontrib><creatorcontrib>Louis, Thomas M</creatorcontrib><creatorcontrib>Busija, David W</creatorcontrib><collection>Medline</collection><collection>MEDLINE</collection><collection>MEDLINE (Ovid)</collection><collection>MEDLINE</collection><collection>MEDLINE</collection><collection>PubMed</collection><collection>CrossRef</collection><collection>Neurosciences Abstracts</collection><collection>MEDLINE - Academic</collection><jtitle>Brain research. Developmental brain research</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Dégı̀, Rózsa</au><au>Bari, Ferenc</au><au>Thrikawala, Nishadi</au><au>Beasley, Tracy C</au><au>Thore, Clara</au><au>Louis, Thomas M</au><au>Busija, David W</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Effects of anoxic stress on prostaglandin H synthase isoforms in piglet brain</atitle><jtitle>Brain research. Developmental brain research</jtitle><addtitle>Brain Res Dev Brain Res</addtitle><date>1998-05-15</date><risdate>1998</risdate><volume>107</volume><issue>2</issue><spage>265</spage><epage>276</epage><pages>265-276</pages><issn>0165-3806</issn><abstract>We examined effects of ischemia and asphyxia on levels of prostaglandin H synthase-1 (PGHS-1) and prostaglandin H synthase-2 (PGHS-2) in piglet brain. Ischemia was induced by increasing intracranial pressure and asphyxia was induced by turning off the respirator. Duration of anoxic stress was 10 min. In some animals, indomethacin (5 mg/kg, i.v.) or 7-nitroindazole (7-NI) was administered prior to ischemia to block PGHS or brain nitric oxide synthase (bNOS), respectively. Tissues from cerebral cortex and hippocampus were removed and fixed and/or frozen after 1, 2, 4 and 8 h of recovery from anoxic stress. In addition, tissues were obtained from untreated animals or from time control animals. Levels of mRNA and proteins were determined using RNase protection assay and immunohistochemical approaches, respectively. In the tissues studied, only a few neurons were immunopositive for PGHS-1, and neither ischemia or asphyxia affected PGHS-1 immunostaining at 8 h after recovery. Likewise, PGHS-1 mRNA did not increase following anoxic stress. In contrast, substantial PGHS-2 immunoreactivity was present in neurons and glial cells in the cerebral cortex and hippocampus and there was no difference between time control and non treated animals. PGHS-2 mRNA increased by 2–4 h after ischemia, and heightened immunoreactivity for PGHS-2 was present at 8 h after ischemia in cerebral cortex and hippocampus. However, asphyxia did not increase PGHS-2 mRNA or immunostaining. Indomethacin pretreatment inhibited increases in mRNA and protein for PGHS-2 after ischemia, while 7-NI had little effect on increases in PGHS-2 immunoreactivity. We conclude that: (1) PGHS-2 is the predominant isoform present in piglet cerebral cortex and hippocampus; (2) Ischemia but not asphyxia increases levels of PGHS-2; (3) Ischemia does not increase levels of PGHS-1; and (4) Indomethacin but not 7-NI attenuates ischemia-induced increases in PGHS-2.</abstract><cop>Netherlands</cop><pub>Elsevier B.V</pub><pmid>9593932</pmid><doi>10.1016/S0165-3806(98)00022-4</doi><tpages>12</tpages></addata></record> |
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subjects | Animals Asphyxia Body Temperature Brain - enzymology Cerebellum Cerebral cortex Cerebral Cortex - drug effects Cerebral Cortex - enzymology Cyclooxygenase Cyclooxygenase Inhibitors - pharmacology Enzyme Inhibitors - pharmacology Female Hippocampus Hippocampus - drug effects Hippocampus - enzymology Hypoxia, Brain - enzymology Immunohistochemistry Indazoles - pharmacology Indomethacin Indomethacin - pharmacology Ischemia Isoenzymes - biosynthesis Male Nitric oxide synthase Nitric Oxide Synthase - antagonists & inhibitors Prostaglandin H synthase-1 Prostaglandin H synthase-2 Prostaglandin-Endoperoxide Synthases - biosynthesis Ribonucleases - metabolism Swine |
title | Effects of anoxic stress on prostaglandin H synthase isoforms in piglet brain |
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