title: Noise-induced hearing loss (NIHL) as a target of oxidative stress-mediated damage: cochlear and cortical responses after an increase in antioxidant defense.
abstract: This study addresses the relationship between cochlear oxidative damage and auditory cortical injury in a rat model of repeated noise exposure. To test the effect of increased antioxidant defenses, a water-soluble coenzyme Q10 analog (Qter) was used. We analyzed auditory function, cochlear oxidative stress, morphological alterations in auditory cortices and cochlear structures, and levels of coenzymes Q9 and Q10 (CoQ9 and CoQ10, respectively) as indicators of endogenous antioxidant capability. We report three main results. First, hearing loss and damage in hair cells and spiral ganglion was determined by noise-induced oxidative stress. Second, the acoustic trauma altered dendritic morphology and decreased spine number of II-III and V-VI layer pyramidal neurons of auditory cortices. Third, the systemic administration of the water-soluble CoQ10 analog reduced oxidative-induced cochlear damage, hearing loss, and cortical dendritic injury. Furthermore, cochlear levels of CoQ9 and CoQ10 content increased. These findings indicate that antioxidant treatment restores auditory cortical neuronal morphology and hearing function by reducing the noise-induced redox imbalance in the cochlea and the deafferentation effects upstream the acoustic pathway.
authors: Institute of Otolaryngology, Catholic University School of Medicine, I-00168 Rome, Italy.
authors: Anna Rita
authors: AR
authors: Fetoni
authors: Paola
authors: P
authors: De Bartolo
authors: Sara Letizia Maria
authors: SL
authors: Eramo
authors: Rolando
authors: R
authors: Rolesi
authors: Fabiola
authors: F
authors: Paciello
authors: Christian
authors: C
authors: Bergamini
authors: Romana
authors: R
authors: Fato
authors: Gaetano
authors: G
authors: Paludetti
authors: Laura
authors: L
authors: Petrosini
authors: Diana
authors: D
authors: Troiani
mesh_terms: D058606:Accessory Atrioventricular Bundle; D000161:Acoustic Stimulation; D000447:Aldehydes / Q000378:metabolism; D000704:Analysis of Variance; D000818:Animals; D000975:Antioxidants / Q000378:metabolism / Q000494:pharmacology / Q000627:therapeutic use; D001306:Auditory Pathways / Q000187:drug effects / Q000473:pathology / Q000648:ultrastructure; D001930:Brain Injuries / Q000188:drug therapy / Q000209:etiology / Q000473:pathology; D003051:Cochlea / Q000473:pathology* / Q000503:physiopathology; D004195:Disease Models, Animal; D004996:Ethidium / Q000031:analogs & derivatives / Q000378:metabolism; D016057:Evoked Potentials, Auditory, Brain Stem / Q000187:drug effects / Q000502:physiology; D006198:Hair Cells, Auditory / Q000473:pathology / Q000648:ultrastructure; D006317:Hearing Loss, Noise-Induced / Q000150:complications / Q000188:drug therapy / Q000473:pathology; D008297:Male; D018384:Oxidative Stress / Q000187:drug effects / Q000502:physiology*; D051381:Rats; D017208:Rats, Wistar; D016622:Silver Staining; D014451:Ubiquinone / Q000031:analogs & derivatives / Q000378:metabolism / Q000494:pharmacology / Q000627:therapeutic use*; D014793:Visual Cortex / Q000187:drug effects / Q000473:pathology*
chemical_list: D000447:Aldehydes; D000975:Antioxidants; C067883:dihydroethidium; D014451:Ubiquinone; D004996:Ethidium; C027576:4-hydroxy-2-nonenal