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Calcium channel subunits in the mouse cochlea
G E Green1, K M Khan, D W Beisel
1Department of Otolaryngology, Wayne State University School of Medicine, Detroit, Michigan 48201, USA.
Journal of Neurochemistry
|July 1, 1996
Summary
This study investigated voltage-gated calcium channel subunits in the mouse cochlea. Key subunits, including alpha1C and beta1, were identified, suggesting specific channel types are present in the auditory system.
Area of Science:
- Neuroscience
- Molecular Biology
- Auditory Science
Background:
- Voltage-gated calcium channels are crucial for neuronal function, including in sensory systems.
- Specific calcium channel subunit expression in the cochlea is not well-characterized.
Purpose of the Study:
- To identify the expression patterns of various voltage-gated calcium channel subunits in the mammalian cochlea.
- To determine if cochlear calcium channel subunit expression differs from other tissues.
Main Methods:
- RNA extraction from CBAJ mouse cochlea (16-18 days old).
- Reverse transcription and Polymerase Chain Reaction (PCR) amplification using primers for 12 calcium channel subunits.
- Nucleotide sequencing of amplified cDNA products.
Main Results:
- Strong amplification of alpha1C, alpha1D, alpha1E, alpha2delta, beta1, beta3, and beta4 subunits.
- No amplification for alpha1A, alpha1B, alpha1S, beta2, or gamma subunits.
- Cochlear alpha2delta and beta1 subunit products showed unique sizes compared to brain and skeletal muscle isoforms, with sequencing confirming identity.
Conclusions:
- The mammalian cochlea expresses L-type and presumptive R-type calcium channels.
- The alpha2delta subunit in the cochlea may be encoded by a distinct splice variant of mRNA.