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A biochemical model of peripheral tinnitus
1Departments of Speech and hearing, Cleveland State University, Main Classroom Building, Room 431, 1899 East 22nd Street, Cleveland, OH 44115, USA. t.sahley@csuohio.edu
Hearing Research
|February 27, 2001
Summary
Stress can trigger tinnitus by releasing dynorphins, which amplify glutamate
Area of Science:
- Neuroscience
- Auditory Science
Background:
- Subjective tinnitus is the perception of sound without an external source, linked to altered neural activity.
- Stress is a known factor that can cause or worsen tinnitus.
- Peripheral tinnitus models often focus on cochlear mechanisms.
Purpose of the Study:
- To propose and provide evidence for a model explaining peripheral tinnitus.
- To elucidate the role of dynorphins and glutamate in tinnitus pathophysiology.
- To explore the potential for auditory neural excitotoxicity.
Main Methods:
- The study proposes a model involving opioid dynorphins and excitatory neurotransmitters.
- It focuses on the interaction between dynorphins and glutamate at N-methyl-D-aspartate (NMDA) receptors in the cochlea.
- Evidence supporting this model is presented.
Main Results:
- Stressful episodes lead to the release of dynorphins in the cochlea.
- Dynorphins enhance glutamate activity at cochlear NMDA receptors.
- This interaction alters neural excitability and discharge patterns in auditory neurons, potentially causing tinnitus.
Conclusions:
- A novel model links stress, dynorphins, and glutamate to cochlear tinnitus.
- Chronic dynorphin exposure may lead to auditory neural excitotoxicity.
- The proposed mechanism may extend beyond the auditory periphery.