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RESEARCH PRODUCT
Cadherin 23 is a component of the transient lateral links in the developing hair bundles of cochlear sensory cells
Walter MarcottiDominique WeilRichard J. GoodyearChristine PetitIsabelle PerfettiniCorné J. KrosVincent MichelUwe WolfrumGuy P. Richardsonsubject
CytoplasmTime FactorsStereocilia (inner ear)EpitopesMice0302 clinical medicineCDH23Inner earMicroscopy ImmunoelectronEgtazic AcidCells Cultured0303 health sciencesintegumentary systemReverse Transcriptase Polymerase Chain ReactionGene Expression Regulation DevelopmentalAnatomyCadherinsHair bundleImmunohistochemistryCochleaCell biologymedicine.anatomical_structureEctodomainHair cellHair cellTransduction (physiology)Signal TransductionMechano-electrical transductionDevelopmentBiologyStereocilia03 medical and health sciencesLanthanumCadherin 23Hair Cells Auditoryotorhinolaryngologic diseasesmedicineAnimalsMolecular BiologyTip link030304 developmental biologyModels GeneticCadherinSubtilisinCell BiologyProtein Structure TertiaryRatsMicroscopy ElectronMicroscopy FluorescenceEar InnerIndicators and Reagentssense organsTip linkLateral linksUsher type 1 syndrome030217 neurology & neurosurgeryPCDH15Developmental Biologydescription
AbstractCadherin 23 is required for normal development of the sensory hair bundle, and recent evidence suggests it is a component of the tip links, filamentous structures thought to gate the hair cells' mechano-electrical transducer channels. Antibodies against unique peptide epitopes were used to study the properties of cadherin 23 and its spatio-temporal expression patterns in developing cochlear hair cells. In the rat, intra- and extracellular domain epitopes are readily detected in the developing hair bundle between E18 and P5, and become progressively restricted to the distal tip of the hair bundle. From P13 onwards, these epitopes are no longer detected in hair bundles, but immunoreactivity is observed in the apical, vesicle-rich, pericuticular region of the hair cell. In the P2–P3 mouse cochlea, immunogold labeling reveals cadherin 23 is associated with kinocilial links and transient lateral links located between and within stereociliary rows. At this stage, the cadherin 23 ectodomain epitope remains on the hair bundle following BAPTA or La3+ treatment, but is lost following exposure to the protease subtilisin. In contrast, mechano-electrical transduction is abolished by BAPTA but unaffected by subtilisin. These results suggest cadherin 23 is associated with transient lateral links that have properties distinct from those of the tip-link.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2005-04-01 | Developmental Biology |