Abstract:
:This study examined the localization and functional expression of ryanodine receptors (RyR) within the cochlea using a combination of reverse transcription-polymerase chain reaction, immunolabeling techniques, and confocal Ca2+ imaging. All three RyR isoform mRNA transcripts were detected in the adult rat cochlea. Immunoperoxidase and immunofluorescence labeling showed that the three isoforms were differentially expressed. The most pronounced RyR protein expression, involving all three isoforms, occurred in the cell bodies of the spiral ganglion neurons. RyR3 labeling extended to the synaptic terminals innervating the inner and outer hair cells. RyR2 expression also occurred in the inner hair cells and supporting cells of the organ of Corti, while cells associated with ion homeostasis in the cochlea, such as the interdental cells of the spiral limbus (RyR1), and the epithelial cells of the spiral prominence and basal cells of the stria vascularis (RyR2 and RyR3), were also immunopositive. The functionality of RyR-gated Ca2+ stores in the spiral ganglion neurons was shown by confocal calcium imaging of fluo-4 fluorescence in rat cochlear slices. Caffeine (5 mM) evoked an increase in intracellular Ca2+ concentration in the cell bodies of the spiral ganglion neurons which occurred inthe absence of external Ca2+. Ryanodine (50 nm-1 microM) evoked comparable increases in intracellular Ca2+ concentration. These findings suggest that RyR-mediated Ca2+ release may be involved in auditory neurotransmission, sound transduction, and cochlear electrochemical homeostasis.
journal_name
Neurosciencejournal_title
Neuroscienceauthors
Morton-Jones RT,Cannell MB,Jeyakumar LH,Fleischer S,Housley GDdoi
10.1016/j.neuroscience.2005.09.011keywords:
subject
Has Abstractpub_date
2006-01-01 00:00:00pages
275-86issue
1eissn
0306-4522issn
1873-7544pii
S0306-4522(05)01039-0journal_volume
137pub_type
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