Journal article
Effects of the cannabinoid CB1 agonist ACEA on salicylate ototoxicity, hyperacusis and tinnitus in guinea pigs
Hearing research, Vol.356, pp.51-62
12/2017
DOI: 10.1016/j.heares.2017.10.012
PMCID: PMC5714060
PMID: 29108871
Abstract
Cannabinoids have been suggested as a therapeutic target for a variety of brain disorders. Despite the presence of their receptors throughout the auditory system, little is known about how cannabinoids affect auditory function. We sought to determine whether administration of arachidonyl-2′-chloroethylamide (ACEA), a highly-selective CB1 agonist, could attenuate a variety of auditory effects caused by prior administration of salicylate, and potentially treat tinnitus. We recorded cortical resting-state activity, auditory-evoked cortical activity and auditory brainstem responses (ABRs), from chronically-implanted awake guinea pigs, before and after salicylate + ACEA. Salicylate-induced reductions in click-evoked ABR amplitudes were smaller in the presence of ACEA, suggesting that the ototoxic effects of salicylate were less severe. ACEA also abolished salicylate-induced changes in cortical alpha band (6–10 Hz) oscillatory activity. However, salicylate-induced increases in cortical evoked activity (suggestive of the presence of hyperacusis) were still present with salicylate + ACEA. ACEA administered alone did not induce significant changes in either ABR amplitudes or oscillatory activity, but did increase cortical evoked potentials. Furthermore, in two separate groups of non-implanted animals, we found no evidence that ACEA could reverse behavioural identification of salicylate- or noise-induced tinnitus. Together, these data suggest that while ACEA may be potentially otoprotective, selective CB1 agonists are not effective in diminishing the presence of tinnitus or hyperacusis.
•CB1 agonist (ACEA) effects were assessed in awake guinea pigs following salicylate.•Salicylate-induced decreases in brainstem response amplitudes were tempered by ACEA.•Decreases in alpha band oscillations were not evident following salicylate + ACEA.•ACEA did not eliminate salicylate-induced increases in cortical evoked potentials.•ACEA failed to prevent or reverse salicylate- or noise-induced tinnitus behaviour.
Details
- Title: Subtitle
- Effects of the cannabinoid CB1 agonist ACEA on salicylate ototoxicity, hyperacusis and tinnitus in guinea pigs
- Creators
- Joel I. Berger - MRC Institute of Hearing ResearchBen Coomber - MRC Institute of Hearing ResearchSamantha Hill - University of NottinghamSteve P.H. Alexander - University of NottinghamWilliam Owen - MRC Institute of Hearing ResearchAlan R. Palmer - MRC Institute of Hearing ResearchMark N. Wallace - University of Nottingham
- Resource Type
- Journal article
- Publication Details
- Hearing research, Vol.356, pp.51-62
- Publisher
- Elsevier B.V
- DOI
- 10.1016/j.heares.2017.10.012
- PMID
- 29108871
- PMCID
- PMC5714060
- ISSN
- 0378-5955
- eISSN
- 1878-5891
- Grant note
- DOI: 10.13039/501100000703, name: Action on Hearing Loss, award: G62
- Language
- English
- Date published
- 12/2017
- Academic Unit
- Neurosurgery
- Record Identifier
- 9984618514202771
Metrics
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