2023
Megahertz Sampling of Prestin (SLC26a5) Voltage-Sensor Charge Movements in Outer Hair Cell Membranes Reveals Ultrasonic Activity that May Support Electromotility and Cochlear Amplification
Santos-Sacchi J, Bai J, Navaratnam D. Megahertz Sampling of Prestin (SLC26a5) Voltage-Sensor Charge Movements in Outer Hair Cell Membranes Reveals Ultrasonic Activity that May Support Electromotility and Cochlear Amplification. Journal Of Neuroscience 2023, 43: 2460-2468. PMID: 36868859, PMCID: PMC10082455, DOI: 10.1523/jneurosci.2033-22.2023.Peer-Reviewed Original ResearchConceptsConformational switchingMammalian hearingMembrane motor proteinCochlear amplificationMotor protein prestinVoltage-sensor charge movementOuter hair cell electromotilityHair cell electromotilityProtein prestinMotor proteinsConformation switchingCharge movementPrestinPrestin activityCell membraneOHC electromotilityHair cell membraneElectromotilityTransmembrane voltageOrgan of CortiAmplificationMammalsMembrane capacitanceProtein
2020
Maturation of Voltage-induced Shifts in SLC26a5 (Prestin) Operating Point during Trafficking and Membrane Insertion
Zhai F, Song L, Bai JP, Dai C, Navaratnam D, Santos-Sacchi J. Maturation of Voltage-induced Shifts in SLC26a5 (Prestin) Operating Point during Trafficking and Membrane Insertion. Neuroscience 2020, 431: 128-133. PMID: 32061780, PMCID: PMC8720582, DOI: 10.1016/j.neuroscience.2020.02.003.Peer-Reviewed Original ResearchConceptsMembrane motor proteinVoltage-dependent proteinsMembrane insertionOuter hair cellsMotor proteinsPrestin densityHEK cell linesConformational changesBiophysical forcesOHC electromotilityProteinCell linesMembrane potentialCooperative interactionsPrestinHair cellsCochlear amplificationTransmembrane voltageNonlinear capacitanceMammalsTraffickingVoltage-induced shiftElectromotilityMaturationMembrane
2011
The still magnificent outer hair cell
Santos-Sacchi J. The still magnificent outer hair cell. Otology Japan 2011, 17: 2-7. DOI: 10.11289/otoljpn1991.17.2.Peer-Reviewed Original ResearchMicroRNA181a plays a key role in hair cell regeneration in the avian auditory epithelium
Frucht CS, Santos-Sacchi J, Navaratnam DS. MicroRNA181a plays a key role in hair cell regeneration in the avian auditory epithelium. Neuroscience Letters 2011, 493: 44-48. PMID: 21316421, PMCID: PMC3065390, DOI: 10.1016/j.neulet.2011.02.017.Peer-Reviewed Original ResearchConceptsHair cell regenerationHair cell deathAuditory epitheliumChicken auditory epitheliumCell deathNon-mammalian vertebratesAvian auditory epitheliumCell regenerationHair cellsBasilar papillaNew hair cellsChicken basilar papillaAvian counterpartsOtotoxic injuryCaspase-3MiRNACellsMiR181aKey roleExplantsProliferationRegenerationBrdU-positive cellsVertebratesMammals
2010
Gene Expression Analysis of Forskolin Treated Basilar Papillae Identifies MicroRNA181a as a Mediator of Proliferation
Frucht CS, Uduman M, Duke JL, Kleinstein SH, Santos-Sacchi J, Navaratnam DS. Gene Expression Analysis of Forskolin Treated Basilar Papillae Identifies MicroRNA181a as a Mediator of Proliferation. PLOS ONE 2010, 5: e11502. PMID: 20634979, PMCID: PMC2901389, DOI: 10.1371/journal.pone.0011502.Peer-Reviewed Original ResearchConceptsNew hair cellsAuditory epitheliumChicken auditory epitheliumHair cellsInner ear developmentHair cell regenerationGene expression analysisAuditory hair cellsEar developmentExpression analysisMyosin VIEnrichment analysisCycle controlGene expressionMolecular eventsSingle microRNAMediator of proliferationRelevant pathwaysFunctional experimentsPost-hatch chicksRegenerating tissueMammalsGenesBrdU incorporationCell regeneration
2004
On Membrane Motor Activity and Chloride Flux in the Outer Hair Cell: Lessons Learned from the Environmental Toxin Tributyltin
Song L, Seeger A, Santos-Sacchi J. On Membrane Motor Activity and Chloride Flux in the Outer Hair Cell: Lessons Learned from the Environmental Toxin Tributyltin. Biophysical Journal 2004, 88: 2350-2362. PMID: 15596517, PMCID: PMC1305283, DOI: 10.1529/biophysj.104.053579.Peer-Reviewed Original ResearchConceptsLateral membranesCell’s mechanical activityOuter hair cellsMammalian cochlear amplifierHair cellsMembrane motorMarine mammalsIntact outer hair cellsPotent abilityFood chainNonselective conductanceCl(-) homeostasisPrestinNanomolar concentrationsExtracellular Cl- concentrationCl fluxMembraneCellsNew environmental threatsMammalsChloride effectTributyltinEnvironmental threatsHomeostasisNonlinear capacitance
2003
New tunes from Corti’s organ: the outer hair cell boogie rules
Santos-Sacchi J. New tunes from Corti’s organ: the outer hair cell boogie rules. Current Opinion In Neurobiology 2003, 13: 459-468. PMID: 12965294, DOI: 10.1016/s0959-4388(03)00100-4.Peer-Reviewed Original ResearchConceptsSpecial cell typesHair cellsOuter hair cell electromotilityHair cell electromotilityMolecular identificationCell typesMammalsMechanism of actionOuter hair cellsAdditional mechanismVertebratesCellsAmplificationMechanismKnockoutElectromotilityOrgansSuch amplificationCorti's organAcoustic stimuliRemarkable progress