dc.contributor.author |
Yee, Andrew |
en |
dc.contributor.author |
Freestone, Peter |
en |
dc.contributor.author |
Bai, Jizhong |
en |
dc.contributor.author |
Lipski, Janusz |
en |
dc.date.accessioned |
2017-01-27T00:16:53Z |
en |
dc.date.available |
2016-10-18 |
en |
dc.date.issued |
2017-01 |
en |
dc.identifier.citation |
Experimental Neurology, January 2017, 287 (1), 34 - 43 |
en |
dc.identifier.issn |
0014-4886 |
en |
dc.identifier.uri |
http://hdl.handle.net/2292/31694 |
en |
dc.description.abstract |
Parkinson's disease (PD) is not only associated with degeneration of dopaminergic (DAergic) neurons in the Substantia Nigra, but also with profound loss of noradrenergic neurons in the Locus Coeruleus (LC). Remarkably, LC degeneration may exceed, or even precede the loss of nigral DAergic neurons, suggesting that LC neurons may be more susceptible to damage by various insults. Using a combination of electrophysiology, fluorescence imaging and electrochemistry, we directly compared the responses of LC, nigral DAergic and nigral non-dopaminergic (non-DAergic) neurons in rat brain slices to acute application of rotenone, a mitochondrial toxin used to create animal and in vitro models of PD. Rotenone (0.01–5.0 μM) dose-dependently inhibited the firing of all three groups of neurons, primarily by activating KATP channels. The toxin also depolarised mitochondrial potential (Ψm) and released reactive oxygen species (H2O2). When KATP channels were blocked, rotenone (1 μM) increased the firing of LC neurons by activating an inward current associated with dose-dependent increase of cytosolic free Ca2 + ([Ca2 +]i). This effect was attenuated by blocking oxidative stress-sensitive TRPM2 channels, and by pre-treatment of slices with anti-oxidants. These results demonstrate that rotenone inhibits the activity of LC neurons mainly by activating KATP channels, and increases [Ca2 +]ivia TRPM2 channels. Since the responses of LC neurons were smaller than those of nigral DAergic neurons, our study shows that LC neurons are paradoxically less sensitive to acute effects of this parkinsonian toxin. |
en |
dc.description.uri |
https://www.ncbi.nlm.nih.gov/pubmed/27771354 |
en |
dc.language |
English |
en |
dc.publisher |
Elsevier |
en |
dc.relation.ispartofseries |
Experimental Neurology |
en |
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. Details obtained from http://www.sherpa.ac.uk/romeo/issn/0014-4886/
https://www.elsevier.com/about/company-information/policies/sharing |
en |
dc.rights.uri |
https://researchspace.auckland.ac.nz/docs/uoa-docs/rights.htm |
en |
dc.title |
Paradoxical lower sensitivity of Locus Coeruleus than Substantia Nigra pars compacta neurons to acute actions of rotenone |
en |
dc.type |
Journal Article |
en |
dc.identifier.doi |
10.1016/j.expneurol.2016.10.010 |
en |
pubs.issue |
1 |
en |
pubs.begin-page |
34 |
en |
pubs.volume |
287 |
en |
dc.description.version |
VoR - Version of Record |
en |
dc.identifier.pmid |
27771354 |
en |
pubs.author-url |
http://www.sciencedirect.com/science/article/pii/S0014488616303338 |
en |
pubs.end-page |
43 |
en |
pubs.publication-status |
Published |
en |
dc.rights.accessrights |
http://purl.org/eprint/accessRights/RestrictedAccess |
en |
pubs.subtype |
Article |
en |
pubs.elements-id |
544138 |
en |
pubs.org-id |
Medical and Health Sciences |
en |
pubs.org-id |
Medical Sciences |
en |
pubs.org-id |
Physiology Division |
en |
dc.identifier.eissn |
1090-2430 |
en |
pubs.record-created-at-source-date |
2017-01-27 |
en |
pubs.online-publication-date |
2016-10-19 |
en |
pubs.dimensions-id |
27771354 |
en |