1
|
Kim EH, Shin SH, Byun SW, Lee HY. Exploring the origins of decreased sound tolerance in tinnitus patients. Front Neurol 2023; 14:1273705. [PMID: 38020634 PMCID: PMC10657806 DOI: 10.3389/fneur.2023.1273705] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2023] [Accepted: 10/23/2023] [Indexed: 12/01/2023] Open
Abstract
This study aimed to confirm the characteristics of auditory function alterations in tinnitus patients with concomitant decreased sound tolerance (ST) and provide insights for developing tailored therapeutic approaches. A retrospective analysis was conducted on patient records from a tertiary university hospital's tinnitus clinic between March 2020 and June 2023. Demographic attributes and audiological profiles were reviewed. Patients were categorized into Group 1 if loudness discomfort level test outcomes were 77 dB or below, measured using an average of frequencies from 250 Hz to 8 kHz. The remaining patients were allocated to Group 2. Among the 434 tinnitus patients, 115 (26.5%) demonstrated decreased ST and were classified as Group 1. This group exhibited higher DPOAE amplitudes (p < 0.001), shortened latency, and decreased threshold of ABR wave V bilaterally (p < 0.05). No significant disparities were observed in gender, age, tinnitus handicap inventory, visual analog scale, and pure-tone audiometry results except subjective hyperacusis. Binary logistic regression analysis utilizing the forward conditional method revealed that the difference between groups was independently linked to DPOAE response at 7,277 Hz on the left side [B = 0.093, p < 0.001, EXP(B) = 1.07, 95% CI = 1.044-1.153]. Increased DPOAE amplitude and shorter and decreased ABR wave V in tinnitus patients with decreased ST might suggest a possible association with lesions in or around the superior olivary complex or higher central auditory pathway, potentially linked to the inhibition of medial olivocochlear efferents.
Collapse
Affiliation(s)
| | | | | | - Ho Yun Lee
- Department of Otorhinolaryngology-Head and Neck Surgery, Ewha Womans University School of Medicine, Seoul, Republic of Korea
| |
Collapse
|
2
|
Kunnath AJ, Gifford RH, Wallace MT. Cholinergic modulation of sensory perception and plasticity. Neurosci Biobehav Rev 2023; 152:105323. [PMID: 37467908 PMCID: PMC10424559 DOI: 10.1016/j.neubiorev.2023.105323] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2023] [Revised: 07/07/2023] [Accepted: 07/13/2023] [Indexed: 07/21/2023]
Abstract
Sensory systems are highly plastic, but the mechanisms of sensory plasticity remain unclear. People with vision or hearing loss demonstrate significant neural network reorganization that promotes adaptive changes in other sensory modalities as well as in their ability to combine information across the different senses (i.e., multisensory integration. Furthermore, sensory network remodeling is necessary for sensory restoration after a period of sensory deprivation. Acetylcholine is a powerful regulator of sensory plasticity, and studies suggest that cholinergic medications may improve visual and auditory abilities by facilitating sensory network plasticity. There are currently no approved therapeutics for sensory loss that target neuroplasticity. This review explores the systems-level effects of cholinergic signaling on human visual and auditory perception, with a focus on functional performance, sensory disorders, and neural activity. Understanding the role of acetylcholine in sensory plasticity will be essential for developing targeted treatments for sensory restoration.
Collapse
Affiliation(s)
- Ansley J Kunnath
- Neuroscience Graduate Program, Vanderbilt University, Nashville, TN, USA; Medical Scientist Training Program, Vanderbilt University School of Medicine, Nashville, TN, USA
| | - René H Gifford
- Department of Otolaryngology, Vanderbilt University Medical Center, Nashville, TN, USA; Department of Hearing and Speech Sciences, Vanderbilt University School of Medicine, Nashville, TN, USA
| | - Mark T Wallace
- Department of Hearing and Speech Sciences, Vanderbilt University School of Medicine, Nashville, TN, USA; Department of Psychology, Vanderbilt University, Nashville, TN, USA; Department of Pharmacology, Vanderbilt University, Nashville, TN, USA; Department of Psychiatry and Behavioral Sciences, Vanderbilt University, Nashville, TN, USA.
| |
Collapse
|
3
|
Choi J, Kim NH, Park SH, Cho CG, Lee HJ, Kim SU, Park KS. Abnormalities of Otoacoustic Emissions in Myasthenia Gravis: Association With Serological and Electrophysiological Features. Front Neurol 2018; 9:1124. [PMID: 30619074 PMCID: PMC6306561 DOI: 10.3389/fneur.2018.01124] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2018] [Accepted: 12/06/2018] [Indexed: 11/16/2022] Open
Abstract
Objective: To investigate whether otoacoustic emissions (OAEs) are impaired in patients with myasthenia gravis (MG) and whether such dysfunction is associated with serological and electrophysiological features of MG. Methods: We tested 15 patients with MG (30 ears) and 10 healthy age- and sex-matched subjects (20 ears) for transiently evoked OAE (TEOAE) and distortion product OAE (DPOAE). Results: Compared with controls, MG patients revealed a significant reduction in the amplitude of TEOAEs (p < 0.05) and DPOAEs at higher frequencies between 2,026 and 4,053 Hz (p < 0.05). In the subgroup analysis, TEOAE and DPOAE amplitudes were significantly lower in the acetylcholine receptor (AChR) antibody-positive group (p < 0.05) as well as in the repetitive nerve stimulation (RNS)-positive (p < 0.05) group. In particular, the OAE alteration significantly correlated with anti-AChR antibody titers. No significant difference of the OAEs was found between thymomatous and non-thymomatous MG or between purely ocular and generalized MG. Conclusions: Our study confirms that OAEs reveal subclinical dysfunction of the cholinergic neurotransmission of cochlear outer hair cells and correlate well with electrophysiological and serological characteristics of MG patients. Our findings imply that the measurement of OAEs might increase the diagnostic accuracy and help to monitor the severity of MG.
Collapse
Affiliation(s)
- Jongsuk Choi
- Department of Neurology, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seoul, South Korea
| | - Nam-Hee Kim
- Department of Neurology, Dongguk University Ilsan Hospital, Ilsan, South Korea
| | - Soo-Hyun Park
- Department of Critical Care Neurology, Seoul National University Hospital, Seoul, South Korea
| | - Chang Gun Cho
- Department of Otorhinolaryngology, Dongguk University Ilsan Hospital, Ilsan, South Korea
| | - Hyo-Jeong Lee
- Department of Otorhinolaryngology-Head and Neck Surgery, Hallym University College of Medicine, Chuncheon, South Korea
| | - Sung Un Kim
- Department of Neurology, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seoul, South Korea
| | - Kyung Seok Park
- Department of Neurology, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seoul, South Korea
| |
Collapse
|
4
|
Tong O, Delfiner L, Herskovitz S. Pain, Headache, and Other Non-motor Symptoms in Myasthenia Gravis. Curr Pain Headache Rep 2018; 22:39. [DOI: 10.1007/s11916-018-0687-3] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
|
5
|
Prakash Krishnan Muthaiah V, Ding D, Salvi R, Roth JA. Carbaryl-induced ototoxicity in rat postnatal cochlear organotypic cultures. ENVIRONMENTAL TOXICOLOGY 2017; 32:956-969. [PMID: 27296064 DOI: 10.1002/tox.22296] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/21/2016] [Revised: 05/16/2016] [Accepted: 05/21/2016] [Indexed: 06/06/2023]
Abstract
Carbaryl, a widely used carbamate-based insecticide, is a potent anticholinesterase known to induce delayed neurotoxicity following chronic exposure. However, its potential toxic effects on the cochlea, the sensory organ for hearing that contains cholinergic efferent neurons and acetylcholine receptors on the hair cells (HC) and spiral ganglion neurons has heretofore not been evaluated. To assess ototoxic potential of carbaryl, cochlear organotypic cultures from postnatal day 3 rats were treated with doses of carbaryl ranging from 50 to 500 μM for 48 h up to 96 h. Carbaryl damaged both the sensory HC and spiral ganglion neurons in a dose- and duration-dependent manner. HC and neuronal damage was observed at carbaryl concentrations as low as 50 μM after 96-h treatment and 100 μM after 48-h treatment. Hair cell was greatest in the high frequency basal region of the cochlea and progressively decreased towards the apex consistent with the majority of ototoxic drugs. In contrast, damage to the spiral ganglion neurons was of similar magnitude in the basal and apical regions of the cochlea. Carbaryl damage was characterized by soma shrinkage, nuclear condensation and fragmentation, and blebbing, morphological features of programmed cell death. Carbaryl upregulated the expression of executioner caspase-3 in HC and spiral ganglion neurons indicating that cellular damage occurred primarily by caspase-mediated apoptosis. These results suggest that chronic exposure to carbaryl and other carbamate anticholinesterases may be ototoxic. © 2016 Wiley Periodicals, Inc. Environ Toxicol 32: 956-969, 2017.
Collapse
Affiliation(s)
| | - Dalian Ding
- Center for Hearing and Deafness, University at Buffalo, Buffalo, New York, 14214
| | - Richard Salvi
- Center for Hearing and Deafness, University at Buffalo, Buffalo, New York, 14214
| | - Jerome A Roth
- Department of Pharmacology and Toxicology, University at Buffalo, Buffalo, New York, 14214
| |
Collapse
|
6
|
Ralli M, Altissimi G, Di Stadio A, Mazzei F, Turchetta R, Cianfrone G. Relationship between hearing function and myasthenia gravis: A contemporary review. J Int Med Res 2016; 45:1459-1465. [PMID: 27834304 PMCID: PMC5718710 DOI: 10.1177/0300060516672124] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
There is increasing evidence of a connection between hearing function and myasthenia gravis (MG). Studies of the pathophysiological basis of this relationship suggest that acetylcholine receptors (AChRs) on outer hair cells (OHCs) play a central role. In patients with MG, autoantibodies against AChRs induce a progressive loss of AChRs on OHCs, decreasing their electromotility. The stapedial reflex decay test can be altered in MG patients, and can be used as an additional tool for diagnosis and monitoring. Transient evoked and distortion product otoacoustic emissions are the main diagnostic tool for monitoring OHC functionality in MG patients, and can be used to record subclinical hearing alterations before the onset of clinically evident hearing loss. Understanding the association between MG and hearing dysfunction requires a multidisciplinary approach. Otolaryngologists should take this relationship into account when approaching patients with a diagnosis of myasthenia gravis and “in patients with MG” with ã in MG patients, and the progress of hearing alterations should always be monitored in patients with MG.
Collapse
Affiliation(s)
- Massimo Ralli
- 1 Department of Oral and Maxillofacial Sciences, Sapienza University of Rome, Italy
| | - Giancarlo Altissimi
- 2 Department of Sense Organs, Audiology Section, Policlinico Umberto I, Sapienza University of Rome, Italy
| | - A Di Stadio
- 3 Department of Otolaryngology, Massachusetts Eye and Ear Infirmary, Boston, MA, USA
| | - Filippo Mazzei
- 2 Department of Sense Organs, Audiology Section, Policlinico Umberto I, Sapienza University of Rome, Italy
| | - Rosaria Turchetta
- 2 Department of Sense Organs, Audiology Section, Policlinico Umberto I, Sapienza University of Rome, Italy
| | - Giancarlo Cianfrone
- 2 Department of Sense Organs, Audiology Section, Policlinico Umberto I, Sapienza University of Rome, Italy
| |
Collapse
|
7
|
Osman AA, Schrader AD, Hawkes AJ, Akil O, Bergeron A, Lustig LR, Simmons DD. Muscle-like nicotinic receptor accessory molecules in sensory hair cells of the inner ear. Mol Cell Neurosci 2008; 38:153-69. [PMID: 18420419 PMCID: PMC2480618 DOI: 10.1016/j.mcn.2008.02.008] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2007] [Revised: 01/28/2008] [Accepted: 02/12/2008] [Indexed: 11/30/2022] Open
Abstract
Nothing is known about the regulation of nicotinic acetylcholine receptors (nAChRs) in hair cells of the inner ear. MuSK, rapsyn and RIC-3 are accessory molecules associated with muscle and brain nAChR function. We demonstrate that these accessory molecules are expressed in the inner ear raising the possibility of a muscle-like mechanism for clustering and assembly of nAChRs in hair cells. We focused our investigations on rapsyn and RIC-3. Rapsyn interacts with the cytoplasmic loop of nAChR alpha9 subunits but not nAChR alpha10 subunits. Although rapsyn and RIC-3 increase nAChR alpha9 expression, rapsyn plays a greater role in receptor clustering while RIC-3 is important for acetylcholine-induced calcium responses. Our data suggest that RIC-3 facilitates receptor function, while rapsyn enhances receptor clustering at the cell surface.
Collapse
MESH Headings
- Animals
- Bungarotoxins/pharmacology
- Calcium/metabolism
- Female
- Hair Cells, Auditory, Inner/cytology
- Hair Cells, Auditory, Inner/metabolism
- Humans
- Intracellular Signaling Peptides and Proteins/genetics
- Intracellular Signaling Peptides and Proteins/metabolism
- Kidney/cytology
- LLC-PK1 Cells
- Male
- Mice
- Mice, Inbred C57BL
- Muscle Proteins/metabolism
- Pregnancy
- RNA, Messenger/metabolism
- Rats
- Rats, Sprague-Dawley
- Receptor Protein-Tyrosine Kinases/genetics
- Receptor Protein-Tyrosine Kinases/metabolism
- Receptors, Cholinergic/genetics
- Receptors, Cholinergic/metabolism
- Receptors, Nicotinic/genetics
- Receptors, Nicotinic/metabolism
- Swine
- Synapses/metabolism
- Transfection
Collapse
Affiliation(s)
- Abdullah A. Osman
- Department of Otolaryngology, Washington University School of Medicine, 660 South Euclid Ave., St. Louis MO 63110
| | - Angela D. Schrader
- Department of Otolaryngology, Washington University School of Medicine, 660 South Euclid Ave., St. Louis MO 63110
| | - Aubrey J. Hawkes
- Department of Otolaryngology, Washington University School of Medicine, 660 South Euclid Ave., St. Louis MO 63110
- Department of Physiolgical Science, University of California, Los Angeles
| | - Omar Akil
- Department of Otolaryngology-Head & Neck Surgery, University of California San Francisco, 400 Parnassus Avenue, San Francisco CA 94143
| | - Adam Bergeron
- Program in Neuroscience, Washington University School of Medicine, 660 South Euclid Ave., St. Louis MO 63110
| | - Lawrence R. Lustig
- Department of Otolaryngology-Head & Neck Surgery, University of California San Francisco, 400 Parnassus Avenue, San Francisco CA 94143
| | - Dwayne D. Simmons
- Department of Otolaryngology, Washington University School of Medicine, 660 South Euclid Ave., St. Louis MO 63110
- Department of Anatomy and Neurobiology, Washington University School of Medicine, 660 South Euclid Ave., St. Louis MO 63110
- Program in Neuroscience, Washington University School of Medicine, 660 South Euclid Ave., St. Louis MO 63110
- Department of Physiolgical Science, University of California, Los Angeles
| |
Collapse
|
8
|
Di Girolamo S, Napolitano B, Alessandrini M, Bruno E. Experimental and clinical aspects of the efferent auditory system. ACTA NEUROCHIRURGICA. SUPPLEMENT 2007; 97:419-24. [PMID: 17691330 DOI: 10.1007/978-3-211-33081-4_47] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
The discovery of active mechanisms in the cochlea and the efferent auditory pathways from the brain to the cochlea demonstrated the existence of a modulation of the auditory input in the central nervous system (CNS). Otoacoustic emissions (OAEs) are weak signals that can be recorded in the ear canal and are considered a byproduct of an active process from the outer hair cells (OHCs) to the basilar membrane. The efferent auditory system plays an inhibitory role on the activity of OHCs; its stimulation reduces auditory nerve response, basilar membrane motility and OAEs amplitude. Indirect stimulation by contralateral sound is also inhibitory; a reduction of OAEs amplitude can be recorded and such an effect disappears after olivocochlear bundle section. The efferent system seems to play a role in detection of signals in noise, protection in noise-induced cochlear damage, development of hearing and processing of complex auditory signals. With respect to clinical application, OAEs suppression after contralateral auditory stimulation seems to be the only objective and non-invasive method for evaluation of the functional integrity of the medial efferent system, and, therefore, for evaluation of the structures lying along its course, at least up to the level of inferior colliculi.
Collapse
Affiliation(s)
- S Di Girolamo
- Otolaryngology Department, Policlinico Universitario Tor Vergata, University of Rome Tor Vergata, Rome, Italy.
| | | | | | | |
Collapse
|
9
|
Hamed SA, Elattar AM, Hamed EA. Irreversible cochlear damage in myasthenia gravis -- otoacoustic emission analysis. Acta Neurol Scand 2006; 113:46-54. [PMID: 16367899 DOI: 10.1111/j.1600-0404.2005.00541.x] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
OBJECTIVE Acetyl choline (ACh) is the main neurotransmitter of the efferent auditory system. This study is aimed to evaluate cochlear function in myasthenia gravis (MG), a neuromuscular transmission disorder caused by ACh receptor autoantibodies. METHODS This prospective study included 16 myasthenic patients, tested audiologically twice, first after improvement from myasthenic crisis or acute oropharyngeal dysfunction (1 week from admission) and then 2 months later. We detected the effect of contralateral acoustic stimulation (CAS) on patients' transient and distortion product otoacoustic emissions (TEOAE and DPOAE). RESULTS Compared with controls, patients reported significant reduction in overall echo response and amplitude of TEOAEs at 1-2 kHz and at 1-6 kHz of DPOAE with marked reduction at 5 kHz. In the control group, CAS produced amplitude reduction in TEOAEs and DPOAEs at 1-4 kHz. Utilizing masking effect, patients reported amplitude reduction in TEOAEs at 1.5-4 kHz while DPOAEs did not reach significant level except at 1.5 and 5 kHz. After 2 months, no changes were observed compared with early assessment. CONCLUSIONS It is clear that disease progression is associated with irreversible cochlear damage. Lack of improvement in patients' emissions despite partial non-audiometric improvement in relation to receptors needs to be considered.
Collapse
Affiliation(s)
- S A Hamed
- Department of Neurology, Assiut University Hospital, Assiut, Egypt.
| | | | | |
Collapse
|
10
|
Safieddine S, Ly CD, Wang YX, Wang CY, Kachar B, Petralia RS, Wenthold RJ. Ocsyn, a novel syntaxin-interacting protein enriched in the subapical region of inner hair cells. Mol Cell Neurosci 2002; 20:343-53. [PMID: 12093165 DOI: 10.1006/mcne.2002.1120] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Sensory (hair) cells of the inner ear contain two specialized areas of membrane delivery. The first, located at the cell base, is the afferent synapse where rapid delivery of synaptic vesicles is required to convey information about auditory signals with exceedingly high temporal precision. The second area is at the apex. To accommodate the continuous movement of stereocilia and facilitate their repair, recycling of membrane components is required. Intense vesicular traffic is restricted to a narrow band of cytoplasm around the cuticular plate, which anchors stereocilia. Our previous analyses showed that SNARE proteins (syntaxin 1A/SNAP25/VAMP1) are concentrated at both poles of hair cells, consistent with their involvement in membrane delivery at both locations. To investigate further the molecules involved in membrane delivery at these two sites, we constructed a two-hybrid library of the organ of Corti and probed it with syntaxin 1A. Here we report the cloning of a novel syntaxin-binding protein that is concentrated in a previously uncharacterized organelle at the apex of inner hair cells.
Collapse
Affiliation(s)
- S Safieddine
- Laboratory of Neurochemistry, National Institute on Deafness and Other Communication Disorders, Bethesda, Maryland 20892, USA
| | | | | | | | | | | | | |
Collapse
|
11
|
Di Girolamo S, d'Ecclesia A, Quaranta N, Garozzo A, Evoli A, Paludetti G. Effects of contralateral white noise stimulation on distortion product otoacoustic emissions in myasthenic patients. Hear Res 2001; 162:80-4. [PMID: 11707354 DOI: 10.1016/s0378-5955(01)00370-7] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Myasthenia gravis (MG) induces a reduction of transient evoked otoacoustic emissions (TEOAEs) and distortion product otoacoustic emissions (DPOAEs) that reverses partially after administration of an acetylcholinesterase (AChE) inhibitor. In normal subjects a contralateral acoustic stimulation (CAS) produces an amplitude reduction of TEOAEs and DPOAEs. This effect, called contralateral suppression (CS), is mediated by the efferent auditory system. Twenty subjects affected by MG underwent DPOAE recording with and without contralateral white noise in a drug-free baseline period ('basal') and 1 h ('post') after administration of a reversible AChE inhibitor. In 'basal' condition CAS did not induce significant DPOAE amplitude changes but a paradoxical slight increase was observed. After drug administration, CAS produced a significant decrease of DPOAE amplitudes for middle frequencies (f(2) between 1306 and 2600 Hz). In normal controls CAS caused a significant decrease (P<0.001) for all frequencies. The amount of CS in controls and in the MG 'post' condition was not significantly different. The increased acetylcholine (ACh) availability following drug consumption seems to partially restore outer hair cell function and enhances their electromotility; a further influx of ACh due to CAS yields to restoration of the CS. These findings also suggest that DPOAEs may be useful in the diagnosis of MG and for monitoring the effectiveness of treatment.
Collapse
Affiliation(s)
- S Di Girolamo
- Institute of Otorhinolaryngology, Catholic University Sacro Cuore, Rome, Italy.
| | | | | | | | | | | |
Collapse
|