| Hyperbaric nitrogen and pentobarbital on synaptosomal membrane lipids and free fatty acids. | |
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MedLine Citation:
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PMID: 16716059 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Nitrogen at high pressures and anesthetics increase lipid monolayer surface pressure and in turn modulates monolayer associated lipolytic enzyme activity that could alter membrane lipids. We tested the hypothesis that nitrogen at pressures of 5 and 10 megapascals (MPa) and pentobarbital induce alterations in synaptosomal membrane phospholipid and free fatty acid (FFA). Rat cortical synaptosomes in Krebs-Henseleit buffer were placed in steel chambers and incubated for four hours at 37 degrees C: at 5 or 10 MPa of O2/balance N2; at one 0.1 MPa on room air, and with 10 mg pentobarbital. Free fatty acids (FFA) were quantified by thin-layer and gas chromatography, and neutral and acidic lipids by high-pressure thin layer chromatography and protein by Biorad colorimetric assay. Statistical analyses were by ANOVA and posthoc analysis by Neuman-Keuls and Kruskal-Wallis tests at p < 0.05. Sphyngomyelin, phosphatidylcholine, phosphatidylethanolamine, cerebroside and cholesterol were unchanged by 5 and 10 MPa nitrogen and pentobarbital. Free fatty acids (16:00, 18:00, 18:01, 20:00, 22:0, 22:01 and 24:01) at 10 MPa were reduced compared to 5 MPa (p < 0.05) but unaffected by pentobarbital. The decrease in synaptosomal membrane FFA at 10 MPa suggests attenuated hydrolysis of membrane phospholipids without detectable alterations in membrane phospholipid composition. |
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Authors:
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G Kostopanagiotou; I Hamamoto; V Hartwell; E M Nemoto |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Undersea & hyperbaric medicine : journal of the Undersea and Hyperbaric Medical Society, Inc Volume: 33 ISSN: 1066-2936 ISO Abbreviation: Undersea Hyperb Med Publication Date: 2006 Mar-Apr |
Date Detail:
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Created Date: 2006-05-23 Completed Date: 2006-06-05 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 9312954 Medline TA: Undersea Hyperb Med Country: United States |
Other Details:
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Languages: eng Pagination: 95-101 Citation Subset: IM; S |
Affiliation:
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2nd Department of Anesthesiology, School of Medicine, University of Athens, Attikon Hospital, 1 Rimini Str., GR-12462 Athens, Greece. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Anesthesia Animals Cholesterol / analysis Fatty Acids / chemistry* Inert Gas Narcosis / physiopathology Male Membrane Lipids / chemistry* Nitrogen / pharmacology* Pentobarbital / pharmacology* Phospholipids / analysis Pressure Rats Rats, Wistar Synaptosomes / chemistry*, drug effects |
| Chemical | |
Reg. No./Substance:
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0/Fatty Acids; 0/Membrane Lipids; 0/Phospholipids; 57-88-5/Cholesterol; 76-74-4/Pentobarbital; 7727-37-9/Nitrogen |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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