The effect of acidosis on adenosine release from cultured rat forebrain neurons.
Identifieur interne : 002707 ( Main/Exploration ); précédent : 002706; suivant : 002708The effect of acidosis on adenosine release from cultured rat forebrain neurons.
Auteurs : Christina R. Zamzow [Canada] ; Ratna Bose ; Fiona E. ParkinsonSource :
- Brain research [ 0006-8993 ] ; 2006.
English descriptors
- KwdEn :
- Acetates (pharmacology), Acidosis (physiopathology), Adenosine (metabolism), Amiloride (analogs & derivatives), Amiloride (pharmacology), Analysis of Variance, Animals, Cells, Cultured, Dose-Response Relationship, Drug, Drug Interactions, Embryo, Mammalian, Excitatory Amino Acid Agonists (pharmacology), Fluoresceins (pharmacokinetics), Hydrogen-Ion Concentration, Methylamines (pharmacology), Models, Biological, N-Methylaspartate (pharmacology), Neurons (drug effects), Neurons (metabolism), Neuroprotective Agents (pharmacology), Prosencephalon (cytology), Purines (pharmacokinetics), Rats, Time Factors, Tritium (pharmacokinetics).
- MESH :
- chemical , analogs & derivatives : Amiloride.
- chemical , metabolism : Adenosine.
- chemical , pharmacokinetics : Fluoresceins, Purines, Tritium.
- chemical , pharmacology : Acetates, Amiloride, Excitatory Amino Acid Agonists, Methylamines, N-Methylaspartate, Neuroprotective Agents.
- cytology : Prosencephalon.
- drug effects : Neurons.
- metabolism : Neurons.
- physiopathology : Acidosis.
- Analysis of Variance, Animals, Cells, Cultured, Dose-Response Relationship, Drug, Drug Interactions, Embryo, Mammalian, Hydrogen-Ion Concentration, Models, Biological, Rats, Time Factors.
Abstract
During cerebral ischemia, dysregulated glutamate release activates N-methyl-d-aspartate (NMDA) receptors which promotes excitotoxicity and intracellular acidosis. Ischemia also induces cellular adenosine (ADO) release, which activates ADO receptors and reduces neuronal injury. The aim of this research was to determine if decreasing intracellular pH (pH(i)) enhances ADO release from neurons. Rat forebrain neurons were incubated with NMDA, acetate, propionate, 5-(N)-ethyl-N-isopropyl amiloride (EIPA) or low pH buffer. pH(i) was determined with the fluorescent dye 2',7'-bis(2-carboxyethyl)-5(6)-carboxyfluorescein acetoxymethyl ester (BCECF-AM) and cellular release of ADO was assayed. NMDA decreased pH(i) and increased ADO release from neurons. Acetate and propionate decreased pH(i) and evoked ADO release from neurons. EIPA, an inhibitor of sodium hydrogen exchanger 1 (NHE1), enhanced the acidosis in neurons but did not enhance ADO release. Decreasing extracellular pH (pH(e)) to 6.8 or 6.45 significantly decreased pH(i) in neurons, but was not consistently associated with increased ADO release. The main finding of this study was that acidosis per se did not enhance ADO release from neurons.
DOI: 10.1016/j.brainres.2006.01.115
PubMed: 16516170
Affiliations:
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Le document en format XML
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Zamzow</name><affiliation wicri:level="4"><nlm:affiliation>Department of Pharmacology and Therapeutics, University of Manitoba, A203-753 McDermot Avenue, Winnipeg, MB, Canada R3E 0T6.</nlm:affiliation><country>Canada</country><wicri:regionArea>Department of Pharmacology and Therapeutics, University of Manitoba, A203-753 McDermot Avenue, Winnipeg, MB</wicri:regionArea><orgName type="university">Université du Manitoba</orgName><placeName><settlement type="city">Winnipeg</settlement><region type="state">Manitoba</region></placeName></affiliation></author><author><name sortKey="Bose, Ratna" sort="Bose, Ratna" uniqKey="Bose R" first="Ratna" last="Bose">Ratna Bose</name></author><author><name sortKey="Parkinson, Fiona E" sort="Parkinson, Fiona E" uniqKey="Parkinson F" first="Fiona E" last="Parkinson">Fiona E. 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Zamzow</name><affiliation wicri:level="4"><nlm:affiliation>Department of Pharmacology and Therapeutics, University of Manitoba, A203-753 McDermot Avenue, Winnipeg, MB, Canada R3E 0T6.</nlm:affiliation><country>Canada</country><wicri:regionArea>Department of Pharmacology and Therapeutics, University of Manitoba, A203-753 McDermot Avenue, Winnipeg, MB</wicri:regionArea><orgName type="university">Université du Manitoba</orgName><placeName><settlement type="city">Winnipeg</settlement><region type="state">Manitoba</region></placeName></affiliation></author><author><name sortKey="Bose, Ratna" sort="Bose, Ratna" uniqKey="Bose R" first="Ratna" last="Bose">Ratna Bose</name></author><author><name sortKey="Parkinson, Fiona E" sort="Parkinson, Fiona E" uniqKey="Parkinson F" first="Fiona E" last="Parkinson">Fiona E. Parkinson</name></author></analytic><series><title level="j">Brain research</title><idno type="ISSN">0006-8993</idno><imprint><date when="2006" type="published">2006</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Acetates (pharmacology)</term><term>Acidosis (physiopathology)</term><term>Adenosine (metabolism)</term><term>Amiloride (analogs & derivatives)</term><term>Amiloride (pharmacology)</term><term>Analysis of Variance</term><term>Animals</term><term>Cells, Cultured</term><term>Dose-Response Relationship, Drug</term><term>Drug Interactions</term><term>Embryo, Mammalian</term><term>Excitatory Amino Acid Agonists (pharmacology)</term><term>Fluoresceins (pharmacokinetics)</term><term>Hydrogen-Ion Concentration</term><term>Methylamines (pharmacology)</term><term>Models, Biological</term><term>N-Methylaspartate (pharmacology)</term><term>Neurons (drug effects)</term><term>Neurons (metabolism)</term><term>Neuroprotective Agents (pharmacology)</term><term>Prosencephalon (cytology)</term><term>Purines (pharmacokinetics)</term><term>Rats</term><term>Time Factors</term><term>Tritium (pharmacokinetics)</term></keywords><keywords scheme="MESH" type="chemical" qualifier="analogs & derivatives" xml:lang="en"><term>Amiloride</term></keywords><keywords scheme="MESH" type="chemical" qualifier="metabolism" xml:lang="en"><term>Adenosine</term></keywords><keywords scheme="MESH" type="chemical" qualifier="pharmacokinetics" xml:lang="en"><term>Fluoresceins</term><term>Purines</term><term>Tritium</term></keywords><keywords scheme="MESH" type="chemical" qualifier="pharmacology" xml:lang="en"><term>Acetates</term><term>Amiloride</term><term>Excitatory Amino Acid Agonists</term><term>Methylamines</term><term>N-Methylaspartate</term><term>Neuroprotective Agents</term></keywords><keywords scheme="MESH" qualifier="cytology" xml:lang="en"><term>Prosencephalon</term></keywords><keywords scheme="MESH" qualifier="drug effects" xml:lang="en"><term>Neurons</term></keywords><keywords scheme="MESH" qualifier="metabolism" xml:lang="en"><term>Neurons</term></keywords><keywords scheme="MESH" qualifier="physiopathology" xml:lang="en"><term>Acidosis</term></keywords><keywords scheme="MESH" xml:lang="en"><term>Analysis of Variance</term><term>Animals</term><term>Cells, Cultured</term><term>Dose-Response Relationship, Drug</term><term>Drug Interactions</term><term>Embryo, Mammalian</term><term>Hydrogen-Ion Concentration</term><term>Models, Biological</term><term>Rats</term><term>Time Factors</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">During cerebral ischemia, dysregulated glutamate release activates N-methyl-d-aspartate (NMDA) receptors which promotes excitotoxicity and intracellular acidosis. Ischemia also induces cellular adenosine (ADO) release, which activates ADO receptors and reduces neuronal injury. The aim of this research was to determine if decreasing intracellular pH (pH(i)) enhances ADO release from neurons. Rat forebrain neurons were incubated with NMDA, acetate, propionate, 5-(N)-ethyl-N-isopropyl amiloride (EIPA) or low pH buffer. pH(i) was determined with the fluorescent dye 2',7'-bis(2-carboxyethyl)-5(6)-carboxyfluorescein acetoxymethyl ester (BCECF-AM) and cellular release of ADO was assayed. NMDA decreased pH(i) and increased ADO release from neurons. Acetate and propionate decreased pH(i) and evoked ADO release from neurons. EIPA, an inhibitor of sodium hydrogen exchanger 1 (NHE1), enhanced the acidosis in neurons but did not enhance ADO release. Decreasing extracellular pH (pH(e)) to 6.8 or 6.45 significantly decreased pH(i) in neurons, but was not consistently associated with increased ADO release. The main finding of this study was that acidosis per se did not enhance ADO release from neurons.</div></front></TEI><affiliations><list><country><li>Canada</li></country><region><li>Manitoba</li></region><settlement><li>Winnipeg</li></settlement><orgName><li>Université du Manitoba</li></orgName></list><tree><noCountry><name sortKey="Bose, Ratna" sort="Bose, Ratna" uniqKey="Bose R" first="Ratna" last="Bose">Ratna Bose</name><name sortKey="Parkinson, Fiona E" sort="Parkinson, Fiona E" uniqKey="Parkinson F" first="Fiona E" last="Parkinson">Fiona E. Parkinson</name></noCountry><country name="Canada"><region name="Manitoba"><name sortKey="Zamzow, Christina R" sort="Zamzow, Christina R" uniqKey="Zamzow C" first="Christina R" last="Zamzow">Christina R. Zamzow</name></region></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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