Please use this identifier to cite or link to this item: http://ir.swu.ac.th/jspui/handle/123456789/15205
Title: The presence of opioid receptors in rat inner ear
Authors: Jongkamonwiwat N.
Phansuwan-Pujito P.
Sarapoke P.
Chetsawang B.
Casalotti S.O.
Forge A.
Dodson H.
Govitrapong P.
Keywords: delta opiate receptor
kappa opiate receptor
messenger RNA
mu opiate receptor
opiate receptor
receptor subtype
animal
animal experiment
article
brain cortex
cochlea
controlled study
cornea limbus
gene amplification
genetics
hair cell
immunocytochemistry
immunohistochemistry
immunoreactivity
inner ear
male
metabolism
nerve fiber
nonhuman
nucleotide sequence
polymerase chain reaction
priority journal
protein analysis
protein expression
protein localization
rat
rat strain
reverse transcription polymerase chain reaction
spiral ganglion
tissue distribution
Issue Date: 2003
Abstract: Opioid peptides have been identified in the inner ear but relatively little information is available about the expression and distribution of their receptors. The aim of the present study was therefore to identify and localize the μ (MOR), δ (DOR) and κ (KOR) opioid receptor subtypes within the rat cochlea. The expression of these opioid receptor subtypes was determined by reverse transcriptase-polymerase chain reaction followed by nested polymerase chain reaction analysis. Amplification of RNAs from rat cerebral cortex (positive control) and rat cochlea with MOR, DOR and KOR primers resulted in products of the predicted lengths, 564, 356 and 276 bp, respectively. Restriction digestion confirmed the identity of these products. All three receptor subtypes were identified in the cochlea and further characterized by immunocytochemistry. DOR and KOR immunoreactivity was found in inner and outer hair cells, bipolar cells of the spiral ganglion and interdental cells of the limbus. In contrast, no MOR immunoreactivity was observed in the inner and outer hair cells, and interdental cells. All three types of receptor fibers were also detected in the bipolar cells and nerve fibers within the spiral ganglion. In addition, MOR- and KOR-containing nerve fibers were observed in the limbus. These findings are the first report of the presence of all three classical opioid receptors in the inner ear and suggest that these receptors may have both presynaptic and postsynaptic roles. © 2003 Elsevier Science B.V. All rights reserved.
URI: https://www.scopus.com/inward/record.uri?eid=2-s2.0-0037677544&doi=10.1016%2fS0378-5955%2803%2900175-8&partnerID=40&md5=9756e9ba170de82a9f1b3abf67c5c279
http://ir.swu.ac.th/jspui/handle/123456789/15205
ISSN: 3785955
Appears in Collections:SCOPUS 1983-2021

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