title: Central Nervous Activity upon Systemic Salicylate Application in Animals with Kanamycin-Induced Hearing Loss--A Manganese-Enhanced MRI (MEMRI) Study.
abstract: This study investigated the effect of systemic salicylate on central auditory and non-auditory structures in mice. Since cochlear hair cells are known to be one major target of salicylate, cochlear effects were reduced by using kanamycin to remove or impair hair cells. Neuronal brain activity was measured using the non-invasive manganese-enhanced magnetic resonance imaging technique. For all brain structures investigated, calcium-related neuronal activity was increased following systemic application of a sodium salicylate solution: probably due to neuronal hyperactivity. In addition, it was shown that the central effect of salicylate was not limited to the auditory system. A general alteration of calcium-related activity was indicated by an increase in manganese accumulation in the preoptic area of the anterior hypothalamus, as well as in the amygdala. The present data suggest that salicylate-induced activity changes in the auditory system differ from those shown in studies of noise trauma. Since salicylate action is reversible, central pharmacological effects of salicylate compared to those of (permanent) noise-induced hearing impairment and tinnitus might induce different pathophysiologies. These should therefore, be treated as different causes with the same symptoms.
authors.affiliation: Department of Otolaryngology, Unfallkrankenhaus Berlin, Charité Medical School, Berlin, Germany.
authors.forename: Moritz
authors.initials: M
authors.lastname: Gröschel
authors.affiliation: Department of Otolaryngology, Unfallkrankenhaus Berlin, Charité Medical School, Berlin, Germany.
authors.forename: Romy
authors.initials: R
authors.lastname: Götze
authors.affiliation: Neuroscience Research Center (NWFZ), Charité Medical School, Berlin, Germany.
authors.forename: Susanne
authors.initials: S
authors.lastname: Müller
authors.affiliation: Department of Otolaryngology, Unfallkrankenhaus Berlin, Charité Medical School, Berlin, Germany.
authors.forename: Arne
authors.initials: A
authors.lastname: Ernst
authors.affiliation: Department of Otolaryngology, Unfallkrankenhaus Berlin, Charité Medical School, Berlin, Germany.
authors.forename: Dietmar
authors.initials: D
authors.lastname: Basta
mesh_terms: D000679:Amygdala / Q000737:chemistry / Q000000981:diagnostic imaging / Q000378:metabolism*; D000818:Animals; D001303:Auditory Cortex / Q000187:drug effects / Q000378:metabolism; D001309:Auditory Threshold; D003051:Cochlea / Q000187:drug effects / Q000378:metabolism; D005260:Female; D034381:Hearing Loss / Q000139:chemically induced / Q000000981:diagnostic imaging / Q000473:pathology*; D007031:Hypothalamus / Q000737:chemistry / Q000000981:diagnostic imaging / Q000378:metabolism*; D007612:Kanamycin / Q000633:toxicity; D008279:Magnetic Resonance Imaging; D008297:Male; D008345:Manganese / Q000737:chemistry / Q000378:metabolism*; D051379:Mice; D011859:Radiography; D012459:Salicylates / Q000737:chemistry* / Q000378:metabolism
chemical_list: D012459:Salicylates; D008345:Manganese; D007612:Kanamycin