Involvement of TRP-like channels in the acute ischemic response of hippocampal CA1 neurons in brain slices

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dc.contributor.author Lipski, Janusz en
dc.contributor.author Park, In en
dc.contributor.author Li, Dong en
dc.contributor.author Lee, Stanley en
dc.contributor.author Trevarton, Alexander en
dc.contributor.author Chung, Kenny en
dc.contributor.author Freestone, Peter en
dc.contributor.author Bai, Jizhong en
dc.date.accessioned 2018-10-23T02:07:22Z en
dc.date.accessioned 2018-12-16T04:07:45Z en
dc.date.issued 2006 en
dc.identifier.issn 0006-8993 en
dc.identifier.uri http://hdl.handle.net/2292/45015 en
dc.description.abstract During a period of acute ischemia in vivo or oxygen-glucose deprivation (OGD) in vitro, CA1 neurons depolarize, swell and become overloaded with calcium. Our aim was to test the hypothesis that the initial responses to OGD are at least partly due to transient receptor potential (TRP) channel activation. As some TRP channels are temperature-sensitive, we also compared the effects of pharmacological blockade of the channels with the effects of reducing temperature. Acute hippocampal slices (350 mum) obtained from Wistar rats were submerged in ACSF at 36 degrees C. CA1 neurons were monitored electrophysiologically using extracellular, intracellular or whole-cell patch-clamp recordings. Cell swelling was assessed by recording changes in relative tissue resistance, and changes in intracellular calcium were measured after loading neurons with fura-2 dextran. Blockers of TRP channels (ruthenium red, La3+, Gd3+, 2-APB) or lowering temperature by 3 degrees C reduced responses to OGD. This included: (a) an increased delay to negative shifts of extracellular DC potential; (b) reduction in rate of the initial slow membrane depolarization, slower development of OGD-induced increase in cell input resistance and slower development of whole-cell inward current; (c) reduced tissue swelling; and (d) a smaller rise in intracellular calcium. Mild hypothermia (33 degrees C) and La3+ or Gd3+ (100 microM) showed an occlusion effect when delay to extracellular DC shifts was measured. Expression of TRPM2/TRPM7 (oxidative stress-sensitive) and TRPV3/TRPV4 (temperature-sensitive) channels was demonstrated in the CA1 subfield with RT-PCR. These results indicate that TRP or TRP-like channels are activated by cellular stress and contribute to ischemia-induced membrane depolarization, intracellular calcium accumulation and cell swelling. We also hypothesize that closing of some TRP channels (TRPV3 and/or TRPV4) by lowering temperature may be partly responsible for the neuroprotective effect of hypothermia. en
dc.publisher Elsevier en
dc.relation.ispartofseries Brain Research en
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dc.rights Items in ResearchSpace are protected by copyright, with all rights reserved, unless otherwise indicated. Previously published items are made available in accordance with the copyright policy of the publisher. en
dc.rights.uri https://researchspace.auckland.ac.nz/docs/uoa-docs/rights.htm en
dc.title Involvement of TRP-like channels in the acute ischemic response of hippocampal CA1 neurons in brain slices en
dc.type Journal Article en
dc.identifier.doi 10.1016/j.brainres.2006.01.016 en
pubs.issue 1 en
pubs.begin-page 187 en
pubs.volume 1077 en
dc.rights.holder Copyright: The author en
dc.identifier.pmid 16483552 en
pubs.end-page 199 en
pubs.merge-from 2292/15800 en
pubs.merge-from http://hdl.handle.net/2292/15800 en
pubs.publication-status Published en
dc.rights.accessrights http://purl.org/eprint/accessRights/RestrictedAccess en
pubs.subtype Article en
pubs.elements-id 48966 en
pubs.org-id Medical and Health Sciences en
pubs.org-id Medical Sciences en
pubs.org-id Pharmacology en
pubs.org-id Physiology Division en
pubs.record-created-at-source-date 2012-03-14 en
pubs.dimensions-id 16483552 en


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