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Otoprotection

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https://www.readbyqxmd.com/read/29230928/audiological-monitoring-in-swiss-childhood-cancer-patients
#1
Annette Weiss, Rahel Kuonen, Hanna Brockmeier, Michael Grotzer, Claudia Candreia, Raphael Maire, Pascal Senn, Christof Stieger, Jochen Rosenfeld, Dorothe Veraguth, Martin Kompis, Katrin Scheinemann, Claudia E Kuehni
BACKGROUND: Full audiological monitoring is the best strategy to detect hearing loss early and to provide timely intervention in the absence of a clinical method of otoprotection. Full monitoring requires audiological evaluation before, and then during and after ototoxic cancer treatment. In a worldwide context of monitoring protocols that vary substantially, we analyzed the audiological monitoring of childhood cancer patients over the last decade across treatment centers in Switzerland...
December 12, 2017: Pediatric Blood & Cancer
https://www.readbyqxmd.com/read/29163050/mechanisms-of-cisplatin-induced-ototoxicity-and-otoprotection
#2
REVIEW
Sandeep Sheth, Debashree Mukherjea, Leonard P Rybak, Vickram Ramkumar
Evidence of significant hearing loss during the early days of use of cisplatin as a chemotherapeutic agent in cancer patients has stimulated research into the causes and treatment of this side effect. It has generally been accepted that hearing loss is produced by excessive generation of reactive oxygen species (ROS) in cell of the cochlea, which led to the development of various antioxidants as otoprotective agents. Later studies show that ROS could stimulate cochlear inflammation, suggesting the use of anti-inflammatory agents for treatment of hearing loss...
2017: Frontiers in Cellular Neuroscience
https://www.readbyqxmd.com/read/29160156/prestin-as-an-otologic-biomarker-of-cisplatin-ototoxicity-in-a-guinea-pig-model
#3
James Naples, Robert Cox, Gregory Bonaiuto, And Kourosh Parham
Objective To evaluate (1) whether changes in serum prestin aid in early detection of cisplatin ototoxicity, (2) the role of diltiazem as an otoprotectant, and (3) whether prestin levels are sensitive to effects of diltiazem. Study Design Experimental animal study. Setting Translational research laboratory. Subjects Twenty female guinea pigs. Methods Two groups of 10 guinea pigs were used. The relationship between serum prestin levels and auditory brainstem response (ABR) thresholds was compared between the groups...
November 1, 2017: Otolaryngology—Head and Neck Surgery
https://www.readbyqxmd.com/read/29114207/histone-deacetylase-inhibitors-are-protective-in-acute-but-not-in-chronic-models-of-ototoxicity
#4
Chao-Hui Yang, Zhiqi Liu, Deanna Dong, Jochen Schacht, Dev Arya, Su-Hua Sha
Previous studies have reported that modification of histones alters aminoglycoside-induced hair cell death and hearing loss. In this study, we investigated three FDA-approved histone deacetylase (HDAC) inhibitors (vorinostat/SAHA, belinostat, and panobinostat) as protectants against aminoglycoside-induced ototoxicity in murine cochlear explants and in vivo in both guinea pigs and CBA/J mice. Individually, all three HDAC inhibitors reduced gentamicin (GM)-induced hair cell loss in a dose-dependent fashion in explants...
2017: Frontiers in Cellular Neuroscience
https://www.readbyqxmd.com/read/29108871/effects-of-the-cannabinoid-cb1-agonist-acea-on-salicylate-ototoxicity-hyperacusis-and-tinnitus-in-guinea-pigs
#5
Joel I Berger, Ben Coomber, Samantha Hill, Steve P H Alexander, William Owen, Alan R Palmer, Mark N Wallace
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...
October 31, 2017: Hearing Research
https://www.readbyqxmd.com/read/29105116/a-mitochondrial-targeting-tetrapeptide-bendavia-protects-lateral-line-hair-cells-from-gentamicin-exposure
#6
Xiao Kuang, Yanhui Sun, Zhenjie Wang, Shuang Zhou, Hongzhuo Liu
The hearing loss induced by aminoglycosides is caused by the permanent loss of mechanosensory hair cells of the inner ear. The aim of the present study is therefore to evaluate the protective effect of Bendavia, a novel antioxidant, on gentamicin-induced hair cell damage in zebrafish lateral lines. The results demonstrated the pretreatment of Bendavia exhibited dose-dependent protection against gentamicin in both acute and chronic exposure. We found that Bendavia at 150 μm conferred optimal protection from either acute or chronic exposure with ototoxin...
November 3, 2017: Journal of Applied Toxicology: JAT
https://www.readbyqxmd.com/read/29097487/long-term-protective-effect-of-n-acetylcysteine-against-amikacin-induced-ototoxicity-in-end-stage-renal-disease-a-randomized-trial
#7
Alperen Vural, Ismail Kocyigit, Furkan Şan, Eray Eroglu, İbrahim Ketenci, Aydin Unal, Bulent Tokgoz, Yaşar Ünlü
BACKGROUND: The aim of the study is to evaluate the long-term protective effect of N-acetylcysteine (NAC), an antioxidant agent, against aminoglycoside (AG)-induced ototoxicity. METHODS: A total of 40 patients receiving continuous ambulatory peritoneal dialysis (CAPD) and having their first peritonitis attacks and planned to be treated with AGs were enrolled in the study. They were randomized into 2 groups: 1 group received additional NAC and the other did not. All patients underwent hearing tests with pure tone audiometry (PTA) after the diagnosis, at 1 month and 12 months and at the same time the tumor necrosis factor (TNF)-α and interleukin (IL)-6 levels were measured...
November 2, 2017: Peritoneal Dialysis International: Journal of the International Society for Peritoneal Dialysis
https://www.readbyqxmd.com/read/29062271/aminoglycoside-induced-cochleotoxicity-a-review
#8
REVIEW
Meiyan Jiang, Takatoshi Karasawa, Peter S Steyger
Aminoglycoside antibiotics are used as prophylaxis, or urgent treatment, for many life-threatening bacterial infections, including tuberculosis, sepsis, respiratory infections in cystic fibrosis, complex urinary tract infections and endocarditis. Although aminoglycosides are clinically-essential antibiotics, the mechanisms underlying their selective toxicity to the kidney and inner ear continue to be unraveled despite more than 70 years of investigation. The following mechanisms each contribute to aminoglycoside-induced toxicity after systemic administration: (1) drug trafficking across endothelial and epithelial barrier layers; (2) sensory cell uptake of these drugs; and (3) disruption of intracellular physiological pathways...
2017: Frontiers in Cellular Neuroscience
https://www.readbyqxmd.com/read/29056901/interleukin-10-attenuates-hypochlorous-acid-mediated-cytotoxicity-to-hei-oc1-cochlear-cells
#9
Martin Mwangi, Sung-Hee Kil, David Phak, Hun Yi Park, David J Lim, Raekil Park, Sung K Moon
Inflammatory reaction plays a crucial role in the pathophysiology of acquired hearing loss such as ototoxicity and labyrinthitis. In our earlier work, we showed the pivotal role of otic fibrocytes in cochlear inflammation and the critical involvement of proinflammatory cytokines in cisplatin ototoxicity. We also demonstrated that otic fibrocytes inhibit monocyte chemoattractant protein 1 (CCL2) upregulation in response to interleukin-10 (IL-10) via heme oxygenase 1 (HMOX1) signaling, resulting in suppression of cochlear inflammation...
2017: Frontiers in Cellular Neuroscience
https://www.readbyqxmd.com/read/29032664/the-protective-effect-of-egb-761-against-3-nitropropionic-acid-induced-hearing-loss-the-role-of-sirtuin-1
#10
Mun Young Chang, Jihye Rhee, Shin Hye Kim, Young Ho Kim
Objectives: Local administration of 3-nitropropionic acid (3-NP) to the inner ear induces sensorineural hearing loss. Several studies have shown the otoprotective effects of ginkgo biloba extract EGb 761. Moreover, EGb 761 has been reported to activate Sirtuin 1 (SIRT1). The present study was designed to investigate whether EGb 761 prevents 3-NPinduced sensorineural hearing loss and determine its effects on the expression of SIRT1. Methods: Sprague Dawley rats were divided into four experimental groups: control group receiving vehicle of 3-NP, EGb group receiving EGb 761, 3-NP group receiving 3-NP, and EGb+3-NP group receiving EGb 761 and 3-NP...
October 17, 2017: Clinical and Experimental Otorhinolaryngology
https://www.readbyqxmd.com/read/29018493/variation-in-the-hearing-threshold-in-women-during-the-menstrual-cycle
#11
Dayse da Silva Souza, Brunna Luckwu, Wagner Teobaldo Lopes de Andrade, Luciane Spinelli de Figueiredo Pessoa, João Agnaldo do Nascimento, Marine Raquel Diniz da Rosa
Introduction  The hormonal changes that occur during the menstrual cycle and their relationship with hearing problems have been studied. However, they have not been well explained. Objective  The objective of our study is to investigate the variation in hearing thresholds in women during the menstrual cycle. Method  We conducted a cohort and longitudinal study. It was composed of 30 volunteers, aged 18-39 years old, of which 20 were women during the phases of the menstrual cycle and 10 were men (control group) who underwent audiometry and impedance exams, to correlate the possible audiological changes in each phase of the menstrual cycle...
October 2017: International Archives of Otorhinolaryngology
https://www.readbyqxmd.com/read/28992413/phenotypic-optimization-of-urea-thiophene-carboxamides-to-yield-potent-well-tolerated-and-orally-active-protective-agents-against-aminoglycoside-induced-hearing-loss
#12
Sarwat Chowdhury, Kelly N Owens, R Jason Herr, Qin Jiang, Xinchao Chen, Graham Johnson, Vincent E Groppi, David W Raible, Edwin W Rubel, Julian A Simon
Hearing loss is a major public health concern with no pharmaceutical intervention for hearing protection or restoration. Using zebrafish neuromast hair cells, a robust model for mammalian auditory and vestibular hair cells, we identified a urea-thiophene carboxamide, 1 (ORC-001), as protective against aminoglycoside antibiotic (AGA)-induced hair cell death. The 50% protection (HC50) concentration conferred by 1 is 3.2 μM with protection against 200 μM neomycin approaching 100%. Compound 1 was sufficiently safe and drug-like to validate otoprotection in an in vivo rat hearing loss model...
October 27, 2017: Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/28955207/hydrogen-inhalation-protects-against-ototoxicity-induced-by-intravenous-cisplatin-in-the-guinea-pig
#13
Anette E Fransson, Marta Kisiel, Kristian Pirttilä, Curt Pettersson, Pernilla Videhult Pierre, Göran F E Laurell
Introduction: Permanent hearing loss and tinnitus as side-effects from treatment with the anticancer drug cisplatin is a clinical problem. Ototoxicity may be reduced by co-administration of an otoprotective agent, but the results in humans have so far been modest. Aim: The present preclinical in vivo study aimed to explore the protective efficacy of hydrogen (H2) inhalation on ototoxicity induced by intravenous cisplatin. Materials and Methods: Albino guinea pigs were divided into four groups. The Cispt (n = 11) and Cispt+H2 (n = 11) groups were given intravenous cisplatin (8 mg/kg b...
2017: Frontiers in Cellular Neuroscience
https://www.readbyqxmd.com/read/28928635/d-tubocurarine-and-berbamine-alkaloids-that-are-permeant-blockers-of-the-hair-cell-s-mechano-electrical-transducer-channel-and-protect-from-aminoglycoside-toxicity
#14
Nerissa K Kirkwood, Molly O'Reilly, Marco Derudas, Emma J Kenyon, Rosemary Huckvale, Sietse M van Netten, Simon E Ward, Guy P Richardson, Corné J Kros
Aminoglycoside antibiotics are widely used for the treatment of life-threatening bacterial infections, but cause permanent hearing loss in a substantial proportion of treated patients. The sensory hair cells of the inner ear are damaged following entry of these antibiotics via the mechano-electrical transducer (MET) channels located at the tips of the hair cell's stereocilia. d-Tubocurarine (dTC) is a MET channel blocker that reduces the loading of gentamicin-Texas Red (GTTR) into rat cochlear hair cells and protects them from gentamicin treatment...
2017: Frontiers in Cellular Neuroscience
https://www.readbyqxmd.com/read/28832600/hpn-07-a-free-radical-spin-trapping-agent-protects-against-functional-cellular-and-electrophysiological-changes-in-the-cochlea-induced-by-acute-acoustic-trauma
#15
Donald Ewert, Ning Hu, Xiaoping Du, Wei Li, Matthew B West, Chul-Hee Choi, Robert Floyd, Richard D Kopke
Oxidative stress is considered a major cause of the structural and functional changes associated with auditory pathologies induced by exposure to acute acoustic trauma AAT). In the present study, we examined the otoprotective effects of 2,4-disulfophenyl-N-tert-butylnitrone (HPN-07), a nitrone-based free radical trap, on the physiological and cellular changes in the auditory system of chinchilla following a six-hour exposure to 4 kHz octave band noise at 105 dB SPL. HPN-07 has been shown to suppress oxidative stress in biological models of a variety of disorders...
2017: PloS One
https://www.readbyqxmd.com/read/28796092/oral-administration-of-clinical-stage-drug-candidate-sens-401-effectively-reduces-cisplatin-induced-hearing-loss-in-rats
#16
Mathieu Petremann, Christophe Tran Van Ba, Audrey Broussy, Charlotte Romanet, Jonas Dyhrfjeld-Johnsen
HYPOTHESIS: SENS-401, an oral clinical-stage drug, may reduce cisplatin-induced hearing loss and cochlear damage in an in vivo model. BACKGROUND: Cisplatin is commonly associated with hearing loss, causing significant learning and behavioral difficulties in the pediatric cancer population, and for which there are currently no clinical solutions. SENS-401 has previously been shown to improve acoustic trauma-induced hearing loss in vivo. METHODS: The effect of SENS-401 (R-azasetron besylate) on cisplatin IC50 values was evaluated in a panel of cisplatin-sensitive cell lines (NIH:OVCAR-3, SK-N-AS, NCI-H460, FaDu)...
October 2017: Otology & Neurotology
https://www.readbyqxmd.com/read/28703809/epigallocatechin-3-gallate-a-prototypic-chemopreventative-agent-for-protection-against-cisplatin-based-ototoxicity
#17
Vikrant Borse, Raheem F H Al Aameri, Kelly Sheehan, Sandeep Sheth, Tejbeer Kaur, Debashree Mukherjea, Srinivasan Tupal, Michelle Lowy, Sumana Ghosh, Asmita Dhukhwa, Puspanjali Bhatta, Leonard P Rybak, Vickram Ramkumar
Cisplatin-induced ototoxicity is one of the major factors limiting cisplatin chemotherapy. Ototoxicity results from damage to outer hair cells (OHCs) and other regions of the cochlea. At the cellular level, cisplatin increases reactive oxygen species (ROS) leading to cochlear inflammation and apoptosis. Thus, ideal otoprotective drugs should target oxidative stress and inflammatory mechanisms without interfering with cisplatin's chemotherapeutic efficacy. In this study, we show that epigallocatechin-3-gallate (EGCG) is a prototypic agent exhibiting these properties of an effect otoprotective agent...
July 13, 2017: Cell Death & Disease
https://www.readbyqxmd.com/read/28673569/calcium-channel-blockers-as-therapeutic-agents-for-acquired-sensorineural-hearing-loss
#18
James G Naples
Acquired sensorineural hearing loss represents a challenging clinical scenario. Currently, there are few approved therapies for treating this type of hearing loss, and diagnosis is often made after permanent damage has occurred. There are numerous etiologies for acquired hearing loss, with complex mechanisms underlying each cause. Despite these complexities, apoptosis of the structures within the inner ear, is a theme common to many forms of acquired hearing loss. Apoptosis is a calcium-dependent process, and within the inner ear, L- and T-type calcium channels are believed to contribute to calcium availability during this process...
July 2017: Medical Hypotheses
https://www.readbyqxmd.com/read/28560432/otoprotective-effects-of-ethosuximide-in-nod-ltj-mice-with-age-related-hearing-loss
#19
Lu Sang, Tihua Zheng, Lingqian Min, Xiaolin Zhang, Xiufang Ma, Shami Entenman, Yipeng Su, Qingyin Zheng
Despite long-term efforts to elucidate the mechanisms responsible for age-related hearing loss (AHL), there is currently no available treatment strategy able to provide a cure. Apoptotic cell death, including that of hair cells and spiral ganglion neurons (SGNs) in the cochlea has been proposed to be the classic theory behind the development of AHL. As calcium signaling plays key roles in signal transduction in apoptosis, in this study, we selected ethosuximide, which is able to block T-type calcium (Ca2+ion) channels, suppressing Ca2+...
July 2017: International Journal of Molecular Medicine
https://www.readbyqxmd.com/read/28520533/a-fully-automated-high-throughput-zebrafish-behavioral-ototoxicity-assay
#20
Douglas W Todd, Rohit C Philip, Maki Niihori, Ryan A Ringle, Kelsey R Coyle, Sobia F Zehri, Leanne Zabala, Jordan A Mudery, Ross H Francis, Jeffrey J Rodriguez, Abraham Jacob
Zebrafish animal models lend themselves to behavioral assays that can facilitate rapid screening of ototoxic, otoprotective, and otoregenerative drugs. Structurally similar to human inner ear hair cells, the mechanosensory hair cells on their lateral line allow the zebrafish to sense water flow and orient head-to-current in a behavior called rheotaxis. This rheotaxis behavior deteriorates in a dose-dependent manner with increased exposure to the ototoxin cisplatin, thereby establishing itself as an excellent biomarker for anatomic damage to lateral line hair cells...
August 2017: Zebrafish
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