| Hypothermia and thiopentone sodium: individual and combined neuroprotective effects on cortical cultures exposed to prolonged hypoxic episodes. | |
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MedLine Citation:
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PMID: 12111866 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Because there are many conflicting reports on cerebroprotective effects of hypothermia and barbiturates, we examined the degree of neuroprotection at defined temperatures (normothermia, 37 degrees C; mild hypothermia, 32 degrees C; deep hypothermia, 22 degrees C; and profound hypothermia, 17 degrees C) and various concentrations (low, 4 microM; moderate, 40 microM; and high, 400 & microM) of thiopentone sodium (TPS), alone and in combination in cortical cultures exposed to prolonged hypoxia (24-48 hr). The survival rate of embryonic day (E)16 Wistar rat cortical neurons was evaluated on photomicrographs before and after experiments. During the 24-hr hypoxic period, the survival rate of neurons was maximal with combinations of mild hypothermia with 40 microM (91.6 +/- 0.7%) and 400 microM TPS (90.8 +/- 0.7%) or deep hypothermia combined with all concentrations of TPS (4 microM, 90.6 +/- 1.0%; 40 microM, 91.4 +/- 0.8%; 400 microM, 91.8 +/- 1.2%). During 48 hr hypoxia, the highest survival rate was seen with the combination of deep hypothermia and either 40 microM (90.9 +/- 0.6%) or 400 microM (91.1 +/- 1.4%) TPS. In the presence of profound hypothermia in combination with all concentrations of TPS, the survival rate was significantly reduced (P< 0.01) compared to combined application of either mild or deep hypothermia with TPS. In summary, maximal neuroprotection was attained with hypothermia and TPS in combination rather than applied individually, during prolonged hypoxic episodes (24- 48 hr). During a 24-hr hypoxic period, both mild and deep hypothermia combined with a clinically relevant concentration of TPS (40 microM) offered the highest neuroprotection. Only deep hypothermia provided maximal neuroprotection when combined with 40 microM TPS, during 48-hr hypoxia. Combination of profound hypothermia and TPS did not confer considerable neuroprotection during long lasting hypoxia. |
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Authors:
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Sriranganathan Varathan; Satoshi Shibuta; Tomoaki Shimizu; Vidya Varathan; Takashi Mashimo |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Journal of neuroscience research Volume: 68 ISSN: 0360-4012 ISO Abbreviation: J. Neurosci. Res. Publication Date: 2002 May |
Date Detail:
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Created Date: 2002-07-11 Completed Date: 2002-08-21 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 7600111 Medline TA: J Neurosci Res Country: United States |
Other Details:
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Languages: eng Pagination: 352-62 Citation Subset: IM |
Copyright Information:
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Copyright 2002 Wiley-Liss, Inc. |
Affiliation:
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Department of Anesthesiology, Osaka University Medical School, Osaka, Japan. varathansr@yahoo.co.uk |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Animals Cell Death / drug effects*, physiology Cell Survival / drug effects, physiology Cells, Cultured Cerebral Cortex / drug effects*, metabolism, physiopathology Dose-Response Relationship, Drug Female Fetus Hypnotics and Sedatives / pharmacology* Hypothermia, Induced* Hypoxia-Ischemia, Brain / metabolism, physiopathology, therapy* Neurons / drug effects, metabolism Neuroprotective Agents / pharmacology* Pregnancy Rats Rats, Wistar Temperature Thiopental / pharmacology*, therapeutic use |
| Chemical | |
Reg. No./Substance:
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0/Hypnotics and Sedatives; 0/Neuroprotective Agents; 76-75-5/Thiopental |
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