Name: working with auditory hei-oc1 cells
Uploaded: 2016-09-03T14:00:00.000+00:00
Duration: 8 min 56 s
Description: Watch this Scientific Journal Video about Working with Auditory HEI-OC1 Cells at JoVE.com

This work was supported by NIH Grants R01-DC010146 and R01-DC010397. Its content is solely the responsibility of the authors and does not necessarily represent the official view of the National Institutes of Health.

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The authors declare no existing or potential conflict of interest.

In questo rapporto viene descritto come la cultura delle cellule HEI-OC1 e li usiamo per valutare i meccanismi di citotossicità indotta da farmaci e di indagare le proprietà funzionali del prestin, il motore molecolare del cocleare OHC. Le modalità tecniche, tuttavia, sono abbastanza generali da essere facilmente adattato ai diversi studi. Tutti i protocolli descritti richiedono il corretto uso di tecniche di coltura cellulare consolidate 10. Come con qualsiasi altra linea cell...

Casa Ear Institute-organo del Corti 1 (HEI-OC1), le cellule sono derivati ​​dal organo uditivo di un 1,2 topo transgenico. L&#39;incubazione di una cella da questo topo transgenico a 33 ° C / 10% di CO 2 (condizioni permissive) induce l&#39;espressione di un gene che innesca immortalare de-differenziazione e proliferazione accelerata; spostando le cellule a 39 ° C / 5% di CO 2 (condizioni non permissive) determina una diminuzione della proliferazione, differenziazione e, almeno nel caso di HEI-OC1, morte cellulare 2,3. cellule HEI-OC1 sono stati clonati e caratterizzati nel nostro laboratorio oltre un decennio fa, e studi iniziali hanno indicato che essi esprimono specifici marcatori di cellule ciliate cocleari, come prestin, miosina 7a, Atoh1, BDNF, calbindina e calmodulina, ma anche i marcatori di supporto cellule come connessina 26 e recettore del fattore di crescita dei fibroblasti (FGF-R) 2. Pertanto, è stato suggerito che HEI-OC1 potrebbe rappresentare un common progenitore per le cellule sensoriali e di sostegno dell&#39;organo del Corti 2. Studi paralleli fornito una forte evidenza che archetipo farmaci ototossici come cisplatino, gentamicina e streptomicina indotto caspasi-3 attivazione in queste cellule, mentre i farmaci considerati non ototossici, come la penicillina, non 2,3. Pertanto, questa linea cellulare è stata proposta come un sistema in vitro per studiare i meccanismi cellulari e molecolari coinvolti nella ototossicità e per lo screening del potenziale ototossicità o otoprotective di nuovi farmaci farmacologici. Si stima che le cellule HEI-OC1 sono stati utilizzati in più di centocinquanta studi pubblicati negli ultimi dieci anni. Mentre guardando il potenziale effetto pro-apoptotico di diversi farmaci è stato l&#39;obiettivo principale della maggior parte degli studi che coinvolgono questa linea cellulare, altri importanti processi cellulari come autofagia e senescenza hanno appena cominciato ad essere studiato in cellule HEI-OC1 4-7. iona recente studio condotto dal nostro laboratorio 8, abbiamo usato cellule HEI-OC1 per raccogliere un insieme completo di dati relativi a morte cellulare, la sopravvivenza, la proliferazione, senescenza e autofagia indotta da farmaci diversi farmacologici frequentemente utilizzate per la clinica. Abbiamo anche confrontato alcune delle risposte delle cellule HEI-OC1 con quelli da HEK-293 (cellule renali di embrioni umani) e HeLa (cellule epiteliali umane) che ricevono un trattamento identico. I nostri risultati indicano che le cellule HEI-OC1 rispondono alla ciascun farmaco in modo caratteristico, con una dose distintivo e sensibilità dipendente dal tempo per almeno uno dei meccanismi in esame. Abbiamo anche sottolineato che in studio che una corretta interpretazione dei risultati sperimentali richiederà l&#39;esecuzione di studi paralleli con più di una tecnica 8. In un altro studio abbiamo valutato l&#39;uso di cellule HEI-OC1 per valutare la risposta funzionale di prestin, la proteina del motore delle cellule ciliate esterne cocleari (OHC) 9 </sup&gt;. Abbiamo riportato citometria a flusso e studi di microscopia confocale a scansione laser sul modello di espressione prestin, così come non lineare capacità (NLC) e gli studi di bloccaggio delle cellule-patch di intere cellule HEI-OC1 coltivate a permissiva (P-HEI-OC1) e non permissive (NP-HEI-OC1) condizioni. I nostri risultati indicano che sia espressione prestin e la membrana plasmatica aumento complessivo di localizzazione in un modo dipendente dal tempo in cellule NP-HEI-OC1. È interessante notare, abbiamo anche scoperto che l&#39;aumento di localizzazione prestin a livello della membrana plasmatica delle cellule NP-HEI-OC1 correlata con una diminuzione di Na + K + ATPasi, che translocated dalla membrana plasmatica al citoplasma, senza cambiamenti significativi nell&#39;espressione cellulare totale. Inoltre, abbiamo dimostrato che le cellule P-HEI-OC1 hanno un NLC robusta associata Prestin funzione motoria, che è diminuito quando la densità delle molecole Prestin presenti a livello della membrana plasmatica è aumentata. Complessivamente, questi risultati sostengono fortemente l&#39;utilità della HEI-OC1 le cellule per indagare le proteine ​​uditive. In questo articolo il video viene descritto come la cultura delle cellule HEI-OC1, perché è comodo da usare cellule in crescita in condizioni permissive (P-HEI-OC1) per gli studi di citotossicità, come valutare il meccanismo / s della citotossicità indotta da farmaci e come per eseguire studi elettrofisiologici (ad esempio, patch-clamp, capacità non lineare (NLC)) per indagare le proprietà funzionali del prestin, il motore molecolare del OHC cocleari.

<table><tbody><tr><td>HEI-OC1 cells</td><td></td><td></td><td>ALL THE ASSAY KITS, EQUIPMENTS&amp;nbsp;</td></tr><tr><td>Class II Biological Safety cabinet</td><td>The Baker Company</td><td>Sterilgard III</td><td>AND COMPANIES INDICATED IN THE</td></tr><tr><td>Refrigerated centrifuge</td><td>Eppendorf</td><td>5810R</td><td>PREVIOUS 2 COLUMNS ARE ONLY</td></tr><tr><td>Inverted microscope</td><td>Zeiss</td><td>Axiovert 25</td><td>EXAMPLES, AND ANY OTHER SIMILAR</td></tr><tr><td>Waterbath</td><td>Stovall</td><td>HWB115</td><td>PRODUCT COULD BE USED.</td></tr><tr><td>Cell counter</td><td>Nexcelom</td><td>Cellometer Auto T4</td><td></td></tr><tr><td>Two (2) Cell incubators, one at 33 &amp;deg;C/10% CO&lt;sub&gt;2&lt;/sub&gt; and other at 39 &amp;deg;C/5% CO&lt;sub&gt;2&lt;/sub&gt;</td><td>Forma Scientific</td><td>3110</td><td></td></tr><tr><td>Cell culture dishes, PS, 100 mm x 20 mm with vents</td><td>Greinier Bio-One</td><td>664-160</td><td></td></tr><tr><td>Cell culture dishes , PS,&amp;nbsp; 60 mm x 15 mm with vents&amp;nbsp;</td><td>Greiner Bio-One</td><td>628160</td><td></td></tr><tr><td>Cellstar tissue culture flasks&amp;nbsp; 250 ml</td><td>Greiner Bio-One</td><td>658-175</td><td></td></tr><tr><td>Cellstar tissue cultur&amp;nbsp; flasks 550 ml</td><td>Greiner Bio-One</td><td>660-175</td><td></td></tr><tr><td>&amp;nbsp;6 well cell culture plate, with lid-Cellstar</td><td>Greiner Bio-One</td><td>657-160</td><td></td></tr><tr><td>Microtest Tissue culture plate, 96 well, flat bottom with lid</td><td>Becton Dickinson</td><td>353072</td><td></td></tr><tr><td>Micro-Assay-Plate, Chimmey, 96-well white, clear bottom</td><td>Greiner Bio-One</td><td>655098</td><td></td></tr><tr><td>50 ml Polypropylene conical tube with cap Cellstars</td><td>Becton Dickinson&amp;nbsp;</td><td>352070</td><td></td></tr><tr><td>15 ml Polypropylene conical tubes with cap-Cellstars</td><td>Greiner Bio-One</td><td>188-271</td><td></td></tr><tr><td>PBS pH 7.4 (1x)&amp;nbsp;</td><td>Life Technologies</td><td>10010-023</td><td></td></tr><tr><td>Dulbecco&amp;rsquo;s Modified Eagle&amp;rsquo;s Medium (DMEM)</td><td>Life Technologies</td><td>11965-084</td><td></td></tr><tr><td>Fetal bovine serum (FBS)&amp;nbsp;</td><td>Hyclone</td><td>SH10073.1</td><td></td></tr><tr><td>Leibovitz&#039;s L-15 Medium, no phenol red</td><td>Gibco/Invitrogen</td><td>21083-027</td><td></td></tr><tr><td>Trypsin, 0.25%&amp;nbsp;</td><td>Life Technologies</td><td>25200-056</td><td></td></tr><tr><td>TACS MTT Cell Proliferation Assay Kit</td><td>Trevigen</td><td>4890-25-K</td><td></td></tr><tr><td>Caspase-Glo 3/7 Assay&amp;nbsp; kit</td><td>Promega</td><td>&amp;nbsp; G8091&amp;nbsp;</td><td></td></tr><tr><td>BrdU Cell Proliferation Assay Kit&amp;nbsp;</td><td>Cell Signaling</td><td>6813</td><td></td></tr><tr><td>Non-enzymatic cell dissociation solution&amp;nbsp;</td><td>Sigma-Aldrich</td><td>C5789</td><td></td></tr><tr><td>Cell-Tox Green Cytotoxicity Assay Kit</td><td>Promega</td><td>&amp;nbsp; G8741&amp;nbsp;</td><td></td></tr><tr><td>FACSAriaIII instrument&amp;nbsp;</td><td>BD Biosciences</td><td>&amp;nbsp;FACSAriaIII</td><td>With 488 nm excitation (blue laser)</td></tr><tr><td>Digital Blot Scanner</td><td>LI-COR</td><td>C-DiGit</td><td></td></tr><tr><td>Electrophoresis and Blotting Unit</td><td>Hoefer</td><td>SE300 miniVE</td><td></td></tr><tr><td>Spectra Max 5 Plate Reader with Soft Max Pro 5.2 Software</td><td>Molecular Devices</td><td>SpectraMax 5</td><td></td></tr><tr><td>Patch-clamp amplifier</td><td>HEKA</td><td>EPC-10</td><td></td></tr><tr><td>Puller for preparing patch electrodes</td><td>Sutter Instruments</td><td>P-97</td><td></td></tr></tbody></table>

working with auditory hei-oc1 cells

HEI-OC1 is one of the few mouse auditory cell lines available for research purposes. Originally proposed as an in vitro system for screening of ototoxic drugs, these cells have been used to investigate drug-activated apoptotic pathways, autophagy, senescence, mechanism of cell protection, inflammatory responses, cell differentiation, genetic and epigenetic effects of pharmacological drugs, effects of hypoxia, oxidative and endoplasmic reticulum stress, and expression of molecular channels and receptors. Among other several important markers of cochlear hair cells, HEI-OC1 cells endogenously express prestin, the paradigmatic motor protein of outer hair cells. Thus, they can be very useful to elucidate novel functional aspects of this important auditory protein. HEI-OC1 cells are very robust, and their culture usually does not present big complications. However, they require some special conditions such as avoiding the use of common anti-bacterial cocktails containing streptomycin or other antibiotics as well as incubation at 33 &#176;C to stimulate cell proliferation and incubation at 39 &#176;C to trigger cell differentiation. Here, we describe how to culture HEI-OC1 cells and how to use them in some typical assays, such as cell proliferation, viability, death, autophagy and senescence, as well as how to perform patch-clamp and non-linear capacitance measurements.

In un paio di pubblicazioni recenti abbiamo riportato una serie completa di studi volti a valutare la risposta delle cellule HEI-OC1 a diversi farmaci farmacologici comunemente usati, nonché indagare la funzione prestin 8,9. In questi studi abbiamo fatto uso di tutti i protocolli descritti nelle sezioni precedenti. Uno dei risultati di questi studi precedenti era che le cellule HEI-OC1 coltivate in condizioni non p...

Watch this Scientific Journal Video about Working with Auditory HEI-OC1 Cells at JoVE.com

Working with Auditory HEI-OC1 Cells

House Ear Institute-Organ of Corti 1 (HEI-OC1) is one of the few mouse auditory cell lines currently available for research purposes. This protocol describes how to work with HEI-OC1 cells to investigate the cytotoxic effects of pharmacological drugs as well as functional properties of inner ear proteins.

Gestire le celle di Auditory HEI-OC1

HEI-OC1 is one of the few mouse auditory cell lines available for research purposes. Originally proposed as an in vitro system for screening of ototoxic ...

Research

JoVE Journal

Biology

14.9K Views.  University of California, Los Angeles. House Ear Institute-Organ of Corti 1 (HEI-OC1) is one of the few mouse auditory cell lines currently available for research purposes. This protocol describes how to work with HEI-OC1 cells to investigate the cytotoxic effects of pharmacological drugs as well as functional properties of inner ear proteins.

Video: Working with Auditory HEI-OC1 Cells

Initiating Differentiation in Immortalized Multipotent Otic Progenitor Cells

Use of human induced pluripotent stem cells (iPSC) or embryonic stem cells (ESC) for cell replacement therapies holds great promise. Several limitations including low yields and heterogeneous populations of differentiated cells hinder the progress of stem cell therapies. A fate restricted immortalized multipotent otic progenitor (iMOP) cell line was generated to facilitate efficient differentiation of large numbers of functional hair cells and spiral ganglion neurons (SGN) for inner ear cell replacement therapies. Starting from dissociated cultures of single iMOP cells, protocols that promote cell cycle exit and differentiation by basic fibroblast growth factor (bFGF) withdrawal were described. A significant decrease in proliferating cells after bFGF withdrawal was confirmed using an EdU cell proliferation assay. Concomitant with a decrease in proliferation, successful differentiation resulted in expression of molecular markers and morphological changes. Immunostaining of Cdkn1b (p27KIP) and Cdh1 (E-cadherin) in iMOP-derived otospheres was used as an indicator for differentiation into inner ear sensory epithelia while immunostaining of Cdkn1b and Tubb3 (neuronal &#946;-tubulin) was used to identify iMOP-derived neurons. Use of iMOP cells provides an important tool for understanding cell fate decisions made by inner ear neurosensory progenitors and will help develop protocols for generating large numbers of iPSC or ESC-derived hair cells and SGNs. These methods will accelerate efforts for generating otic cells for replacement therapies.

The current protocols to maintain immortalized multipotent otic progenitor (iMOP) cells and otic differentiation are described. Culture conditions and molecular markers that indicate differentiation into sensory epithelia and spiral ganglion neurons (SGN) are highlighted.

Avvio di differenziazione in cellule multipotenti immortalizzate Otic progenitrici

Use of human induced pluripotent stem cells (iPSC) or embryonic stem cells (ESC) for cell replacement therapies holds great promise. Several limitations ...

Ricerca

Biologia dello sviluppo

Gene Transfer into the Chicken Auditory Organ by In Ovo Micro-electroporation

Chicken embryos are ideal model systems for studying embryonic development as manipulations of gene function can be conducted with relative ease in ovo. The inner ear auditory sensory organ is critical for our ability to hear. It houses a highly specialized sensory epithelium that consists of mechano-transducing hair cells (HCs) and surrounding glial-like supporting cells (SCs). Despite structural differences in the auditory organs, molecular mechanisms regulating the development of the auditory organ are evolutionarily conserved between mammals and aves. In ovo electroporation is largely limited to early stages at E1 - E3. Due to the relative late development of the auditory organ at E5, manipulations of the auditory organ by in ovo electroporation past E3 are difficult due to the advanced development of the chicken embryo at later stages. The method presented here is a transient gene transfer method for targeting genes of interest at stage E4 - E4.5 in the developing chicken auditory sensory organ via in ovo micro-electroporation. This method is applicable for gain- and loss-of-functions with conventional plasmid DNA-based expression vectors and can be combined with in ovo cell proliferation assay by adding EdU (5-ethynyl-2&#180;-deoxyuridine) to the whole embryo at the time of electroporation. The use of green or red fluorescent protein (GFP or RFP) expression plasmids allows the experimenter to quickly determine whether the electroporation successfully targeted the auditory portion of the developing inner ear. In this method paper, representative examples of GFP electroporated specimens are illustrated; embryos were harvested 18 - 96 hr&#160;after electroporation and targeting of GFP to the pro-sensory area of the auditory organ was confirmed by RNA in situ hybridization. The method paper also provides an optimized protocol for the use of the thymidine analog EdU to analyze cell proliferation; an example of an EdU based cell proliferation assay that combines immuno-labeling and click EdU chemistry is provided.

Gene Transfer into the Chicken Auditory Organ by In Ovo Micro-electroporation

The auditory organ mediates hearing. Here we present a modified in ovo micro-electroporation method optimized for studying auditory progenitor cell proliferation and differentiation in the developing chicken auditory organ.

Gene Transfer nel pollo Auditory Organ<em&gt; In Ovo</em&gt; Micro-elettroporazione

Chicken embryos are ideal model systems for studying embryonic development as manipulations of gene function can be conducted with relative ease in ovo. ...

Investigating Outer Hair Cell Motility with a Combination of External Alternating Electrical Field Stimulation and High-speed Image Analysis

OHCs are cylindrical sensorimotor cells located in the Organ of Corti, the auditory organ inside the mammalian inner ear. The name "hair cells" derives from their characteristic apical bundle of stereocilia, a critical element for detection and transduction of sound energy 1. OHCs are able to change shape &#x2014;elongate, shorten and bend&#x2014; in response to electrical, mechanical and chemical stimulation, a motor response considered crucial for cochlear amplification of acoustic signals 2.
OHC stimulation induces two different motile responses: i) electromotility, a.k.a fast motility, changes in length in the microsecond range derived from electrically-driven conformational changes in motor proteins densely packed in OHC plasma membrane, and ii) slow motility, shape changes in the millisecond to seconds range involving cytoskeletal reorganization 2, 3. OHC bending is associated with electromotility, and result either from an asymmetric distribution of motor proteins in the lateral plasma membrane, or asymmetric electrical stimulation of those motor proteins (e.g., with an electrical field perpendicular to the long axis of the cells) 4. Mechanical and chemical stimuli induce essentially slow motile responses, even though changes in the ionic conditions of the cells and/or their environment can also stimulate the plasma membrane-embedded motor proteins 5, 6. Since OHC motile responses are an essential component of the cochlear amplifier, the qualitative and quantitative analysis of these motile responses at acoustic frequencies (roughly from 20 Hz to 20 kHz in humans) is a very important matter in the field of hearing research 7.
The development of new imaging technology combining high-speed videocameras, LED-based illumination systems, and sophisticated image analysis software now provides the ability to perform reliable qualitative and quantitative studies of the motile response of isolated OHCs to an external alternating electrical field (EAEF) 8. This is a simple and non-invasive technique that circumvents most of the limitations of previous approaches 9-11. Moreover, the LED-based illumination system provides extreme brightness with insignificant thermal effects on the samples and, because of the use of video microscopy, optical resolution is at least 10-fold higher than with conventional light microscopy techniques 12. For instance, with the experimental setup described here, changes in cell length of about 20 nm can be routinely and reliably detected at frequencies of 10 kHz, and this resolution can be further improved at lower frequencies. 
We are confident that this experimental approach will help to extend our understanding of the cellular and molecular mechanisms underlying OHC motility.

A reliable method to investigate outer hair cell (OHC) motile responses, including electromotility, slow motility and bending, is described. OHC motility is elicited by stimulation with an external alternating electrical field, and the method takes advantage of high-speed image recording, LED-based illumination, and last generation image analysis software.

Indagare esterno motilità delle cellule dei capelli con una combinazione di stimolazione esterna alternata campo elettrico e ad alta velocità Image Analysis

OHCs are cylindrical sensorimotor cells located in the Organ of Corti, the auditory organ inside the mammalian inner ear. The name "hair cells" derives ...

Neuroscienze

Optogenetic Stimulation of the Auditory Nerve

Direct electrical stimulation of spiral ganglion neurons (SGNs) by cochlear implants (CIs) enables open speech comprehension in the majority of implanted deaf subjects1-6. Nonetheless, sound coding with current CIs has poor frequency and intensity resolution due to broad current spread from each electrode contact activating a large number of SGNs along the tonotopic axis of the cochlea7-9. Optical stimulation is proposed as an alternative to electrical stimulation that promises spatially more confined activation of SGNs and, hence, higher frequency resolution of coding. In recent years, direct infrared illumination of&#160;the cochlea has been used to evoke responses in the auditory nerve10. Nevertheless it requires higher energies than electrical stimulation10,11 and uncertainty remains as to the underlying mechanism12. Here we describe a method based on optogenetics to stimulate SGNs with low intensity blue light, using transgenic mice with neuronal expression of channelrhodopsin 2 (ChR2)13 or virus-mediated expression of the ChR2-variant CatCh14. We used micro-light emitting diodes (&#181;LEDs) and fiber-coupled lasers to stimulate ChR2-expressing SGNs through a small artificial opening (cochleostomy) or the round window. We assayed the responses by scalp recordings of light-evoked potentials (optogenetic auditory brainstem response: oABR) or by microelectrode recordings from the auditory pathway and compared them with acoustic and electrical stimulation.

Cochlear implants (CIs) enable hearing by direct electrical stimulation of the auditory nerve. However, poor frequency and intensity resolution limits the quality of hearing with CIs. Here we describe optogenetic stimulation of the auditory nerve in mice as an alternative strategy for auditory research and developing future CIs.

Stimolazione optogenetic del nervo uditivo

Direct electrical stimulation of spiral ganglion neurons (SGNs) by cochlear implants (CIs) enables open speech comprehension in the majority of implanted ...

In Ovo and Ex Ovo Methods to Study Avian Inner Ear Development

The inner ear perceives sound and maintains balance using the cochlea and vestibule. It does this by using a dedicated mechanosensory cell type known as the hair cell. Basic research in the inner ear has led to a deep understanding of how the hair cell functions, and how dysregulation can lead to hearing loss and vertigo. For this research, the mouse has been the pre-eminent model system. However, mice, like all mammals, have lost the ability to replace hair cells. Thus, when trying to understand cellular therapies for restoring inner ear function, complementary studies in other vertebrate species could provide further insights. The auditory epithelium of birds, the basilar papilla (BP), is a sheet of epithelium composed of mechanosensory hair cells (HCs) intercalated by supporting cells (SCs). Although the anatomical architecture of the basilar papilla and the mammalian cochlea differ, the molecular mechanisms of inner ear development and hearing are similar. This makes the basilar papilla a useful system for not only comparative studies but also to understand regeneration. Here, we describe dissection and manipulation techniques for the chicken inner ear. The technique shows genetic and small molecule inhibition methods, which offer a potent tool for studying the molecular mechanisms of inner ear development. In this paper, we discuss in ovo electroporation techniques to genetically perturb the basilar papilla using CRIPSR-Cas9 deletions, followed by dissection of the basilar papilla. We also demonstrate the BP organ culture and optimal use of culture matrices, to observe the development of the epithelium and the hair cells.

In Ovo and Ex Ovo Methods to Study Avian Inner Ear Development

The chick is a cost-effective, accessible, and widely available model organism for a variety of studies. Here, a series of protocols is detailed to understand the molecular mechanisms underlying avian inner ear development and regeneration.

Metodi Ovo ed Ex Ovo per studiare lo sviluppo dell'orecchio interno aviario

The inner ear perceives sound and maintains balance using the cochlea and vestibule. It does this by using a dedicated mechanosensory cell type known as ...

Auditory Brainstem Response and Outer Hair Cell Whole-cell Patch Clamp Recording in Postnatal Rats

The outer hair cell is one of the two types of sensory hair cells in the mammalian cochlea. They alter their cell length with the receptor potential to amplify the weak vibration of low-level sound signal. The morphology and electrophysiological property of outer hair cells (OHCs) develop in early postnatal ages. The maturation of outer hair cell may contribute to the development of the auditory system. However, the process of OHCs development is not well studied. This is partly because of the difficulty to measure their function by an electrophysiological approach. With the purpose of developing a simple method to address the above issue, here we describe a step-by-step protocol to study the function of OHCs in acutely dissociated cochlea from postnatal rats. With this method, we can evaluate the cochlear response to pure tone stimuli and examine the expression level and function of the motor protein prestin in OHCs. This method can also be used to investigate the inner hair cells (IHCs).

This protocol describes methods to record the auditory brainstem response from postnatal rat pups. To examine the functional development of outer hair cells, the experimental procedure of whole-cell patch clamp recording in isolated outer hair cells is described step-by-step.

Risposta uditiva del tronco cerebrale ed esterna della cellula ciliata cellule intere Patch Clamp registrazione in ratti postnatali

The outer hair cell is one of the two types of sensory hair cells in the mammalian cochlea. They alter their cell length with the receptor potential to ...

Coltivazione efficiente in vitro di cellule ciliate cocleari di topo

Isolation and Culture of Primary Cochlear Hair Cells from Neonatal Mice

Cochlear hair cells are the sensory receptors of the auditory system. These cells are located in the organ of Corti, the sensory organ responsible for hearing, within the osseous labyrinth of the inner ear. Cochlear hair cells consist of two anatomically and functionally distinct types: outer and inner hair cells. Damage to either of them results in hearing loss. Notably, as inner hair cells cannot regenerate, and damage to them is permanent. Hence, in vitro cultivation of primary hair cells is indispensable for investigating the protective or regenerative effects of cochlear hair cells. This study aimed to discover a method for isolating and cultivating mouse hair cells. 
After manual removal of the cochlear lateral wall, the auditory epithelium was meticulously dissected from the cochlear modiolus under a microscope, incubated in a mixture consisting of 0.25% trypsin-EDTA for 10 min at 37 &#176;C, and gently suspended in culture medium using a 200 &#181;L pipette tip. The cell suspension was passed through a cell filter, the filtrate was centrifuged, and cells were cultured in 24-well plates. Hair cells were identified based on their capacity to express a mechanotransduction complex, myosin-VIIa, which is involved in motor tensions, and via selective labeling of F-actin using phalloidin. Cells reached &gt;90% confluence after 4 d in culture. This method can enhance our understanding of the biological characteristics of in vitro cultured hair cells and demonstrate the efficiency of cochlear hair cell cultures, establishing a solid methodological foundation for further auditory research.

Autore in primo piano: Progressi nella coltivazione di cellule ciliate di topo per la ricerca uditiva 

Herein, we present a detailed protocol for isolating and culturing primary cochlear hair cells from mice. Initially, the organ of Corti was dissected from neonatal (aged 3-5 days) murine cochleae under a microscope. Subsequently, cells were enzymatically digested into a single-cell suspension and identified using immunofluorescence after several days in culture.

Isolamento e coltura di cellule ciliate cocleari primarie da topi neonatali

Cochlear hair cells are the sensory receptors of the auditory system. These cells are located in the organ of Corti, the sensory organ responsible for ...

Biologia

Preparing Wedge Brain Slices to Visualize Auditory Neurons

Source: Fischl, M. J. et al., <a href="https://app.jove.com/v/61664">In Vitro Wedge Slice Preparation for Mimicking In Vivo Neuronal Circuit Connectivity.</a>&#160;J. Vis. Exp.&#160;(2020)
This video demonstrates the process of preparing wedge-shaped brain slices in a laboratory setting. Using a vibratome, a wedge-shaped slice from a mouse&#39;s brain is crafted with varying thickness. This slice contains the auditory nerve root positioned on the thicker end, while the hearing-related neurons are located on the thinner end.

Preparazione di fette di cervello a cuneo per visualizzare i neuroni uditivi

All procedures involving animal models have been reviewed by the local institutional animal care committee and the JoVE veterinary review board.
1. Brain ...

Gestire le celle di Auditory HEI-OC1

Riepilogo

Esplora Altri Video

Capitoli in questo video

Avvio di differenziazione in cellule multipotenti immortalizzate Otic progenitrici

Gene Transfer nel pollo Auditory Organ

Indagare esterno motilità delle cellule dei capelli con una combinazione di stimolazione esterna alternata campo elettrico e ad alta velocità Image Analysis

Stimolazione optogenetic del nervo uditivo

Metodi Ovo ed Ex Ovo per studiare lo sviluppo dell'orecchio interno aviario

Risposta uditiva del tronco cerebrale ed esterna della cellula ciliata cellule intere Patch Clamp registrazione in ratti postnatali

Isolamento e coltura di cellule ciliate cocleari primarie da topi neonatali

Isolamento e coltura di cellule ciliate cocleari primarie da topi neonatali

Isolamento e coltura di cellule ciliate cocleari primarie da topi neonatali

Preparazione di fette di cervello a cuneo per visualizzare i neuroni uditivi