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Substance P-like immunoreactivity in the rabbit inner ear.
The Journal of Laryngology and Otology
|August 1, 1984
Summary
Substance P (SP) was found in rabbit auditory and vestibular systems. This neuropeptide may play a role as a modulator or transmitter in inner ear function.
Area of Science:
- Neuroscience
- Otolaryngology
- Cell Biology
Background:
- The auditory and vestibular systems are crucial for hearing and balance.
- The role of neuropeptides, such as substance P (SP), in inner ear function is not fully understood.
Purpose of the Study:
- To investigate the presence and distribution of substance P (SP) in the auditory and vestibular sense organs of the rabbit using immunohistochemistry.
Main Methods:
- Immunohistochemical technique utilizing a monoclonal SP-antibody.
- Examination of vestibular ganglia, spiral ganglion cells, and vestibular sensory epithelia in rabbit inner ear specimens.
Main Results:
- SP-like immunoreactivity was observed in 30-40% of vestibular ganglion cells.
- Approximately 50% of spiral ganglion cells innervating the cochlea's basal part showed SP-like immunoreactivity.
- Neural elements in vestibular sensory epithelia, including type I sensory cell nerve terminals in maculae, exhibited strong SP-like immunoreactivity.
Conclusions:
- Substance P is present in key neural components of the rabbit's auditory and vestibular systems.
- The findings suggest a potential role for SP as a neurotransmitter or modulator in inner ear sensory processing and function.