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1.
Cell Motil Cytoskeleton ; 64(9): 705-17, 2007 Sep.
Article in English | MEDLINE | ID: mdl-17615570

ABSTRACT

Specialized outer hair cells (OHCs) housed within the mammalian cochlea exhibit active, nonlinear, mechanical responses to auditory stimulation termed electromotility. The extraordinary frequency resolution capacity of the cochlea requires an exquisitely equilibrated mechanical system of sensory and supporting cells. OHC electromotile length change, stiffness, and force generation are responsible for a 100-fold increase in hearing sensitivity by augmenting vibrational input to non-motile sensory inner hair cells. Characterization of OHC mechanics is crucial for understanding and ultimately preventing permanent functional deficits due to overstimulation or as a consequence of various cochlear pathologies. The OHCs' major structural assembly is a highly-specialized lateral wall. The lateral wall consists of three structures; a plasma membrane highly-enriched with the motor-protein prestin, an actin-spectrin cortical lattice, and one or more layers of subsurface cisternae. Technical difficulties in independently manipulating each lateral wall constituent have constrained previous attempts to analyze the determinants of OHCs' mechanical properties. Temporal separations in the accumulation of each lateral wall constituent during postnatal development permit associations between lateral wall structure and OHC mechanics. We compared developing and adult gerbil OHC axial stiffness using calibrated glass fibers. Alterations in each lateral wall component and OHC stiffness were correlated as a function of age. Reduced F-actin labeling was correlated with reduced OHC stiffness before hearing onset. Prestin incorporation into the PM was correlated with increased OHC stiffness at hearing onset. Our data indicate lateral wall F-actin and prestin are the primary determinants of OHC mechanical properties before and after hearing onset, respectively.


Subject(s)
Actins/metabolism , Aging/physiology , Hair Cells, Auditory, Outer/growth & development , Hearing/physiology , Mechanotransduction, Cellular/physiology , Nerve Tissue Proteins/metabolism , Animals , Gerbillinae , Hair Cells, Auditory, Outer/ultrastructure
2.
J Neurosci ; 27(24): 6442-51, 2007 Jun 13.
Article in English | MEDLINE | ID: mdl-17567805

ABSTRACT

Outer hair cells (OHCs) are innervated by type II afferent fibers of as yet unknown function. It is still a matter of debate whether OHCs perform exocytosis. If so, they would require presynaptic Ca2+ channels at their basal poles where the type II fibers make contacts. Here we show that L-type Ca2+ channel currents (charge carrier, 10 mM Ba2+) present in neonatal OHCs [postnatal day 1 (P1) to P7] decreased from approximately 170 to approximately 50 pA at approximately the onset of hearing. Ba2+ currents could hardly be measured in mature mouse OHCs because of their high fragility, whereas in the rat, the average Ba2+ current amplitude of apical OHCs was 58 +/- 9 pA (n = 20, P19-P30) compared with that of the inner hair cells (IHCs) of 181 +/- 50 pA (n = 24, P17-P30). Properties of Ba2+ currents of mature OHCs resembled those of neonatal OHCs. One exception was the voltage dependence of activation that shifted between birth and P12 by +9 mV toward positive voltages in OHCs, whereas it remained constant in the IHCs. Ca(v)1.3-specific mRNA was detected in mature OHCs using cell-specific reverse transcription (RT)-PCR and in situ hybridization. Ca(v)1.3 protein was stained exclusively at the base of mature OHCs, in colocalization with the ribbon synapse protein CtBP2 (C-terminal binding protein 2)/RIBEYE. When current sizes were normalized to the estimated number of afferent fibers or presynaptic ribbons, comparable values for IHCs and OHCs were obtained, a finding that together with the colocalization of Ca(v)1.3 and CtBP2/RIBEYE protein strongly suggests a role for Ca(v)1.3 channels in exocytosis of mature OHCs.


Subject(s)
Calcium Channels, L-Type/metabolism , Gene Expression Regulation, Developmental/physiology , Hair Cells, Auditory, Outer/metabolism , Signal Transduction/physiology , 3-Pyridinecarboxylic acid, 1,4-dihydro-2,6-dimethyl-5-nitro-4-(2-(trifluoromethyl)phenyl)-, Methyl ester/pharmacology , Age Factors , Analysis of Variance , Animals , Animals, Newborn , Barium/pharmacology , Calcium Channel Agonists/pharmacology , Calcium Channels, L-Type/genetics , Chlorides/metabolism , Dose-Response Relationship, Radiation , Electric Stimulation/methods , Hair Cells, Auditory, Inner/drug effects , Hair Cells, Auditory, Inner/physiology , Hair Cells, Auditory, Inner/radiation effects , Hair Cells, Auditory, Outer/growth & development , In Situ Hybridization/methods , Membrane Potentials/drug effects , Membrane Potentials/physiology , Mice , Patch-Clamp Techniques/methods , Rats
3.
Hear Res ; 204(1-2): 183-90, 2005 Jun.
Article in English | MEDLINE | ID: mdl-15925203

ABSTRACT

To quantitate in absolute terms the prestin mRNA levels in the explant culture of rat cochlea, we used competitive RT-PCR with a synthetic internal cRNA standard. Prestin gene expression was found at levels of 100 fg specific mRNA/microg total RNA on postnatal day 3, which corresponds to about 300 copies per outer hair cell (OHC) and is indicative of an intermediate level of expression. Two days of culturing resulted in an increase of prestin mRNA levels and in the formation of an apical-basal gradient (p<0.001). To elucidate the variations the prestin mRNA levels undergo as a result of damage to the organ of Corti, we exposed the explant cultures to ischemia and hypoxia. While total RNA was observed to remain unchanged, the numbers of OHCs and the prestin mRNA levels were found to decrease by about 20% and 35%, respectively, compared to normoxia. In conclusion, we showed that the prestin mRNA levels during in vitro development increase and form an apical-basal gradient within 2 days in culture, similar to the postnatal in vivo development. Hypoxia and ischemia result in a decrease of the prestin mRNA level in parallel with OHC loss. The prestin mRNA level can therefore be used as marker of damage to or loss of OHCs.


Subject(s)
Cochlea/metabolism , Proteins/metabolism , RNA, Messenger/metabolism , Animals , Animals, Newborn , Anion Transport Proteins , Biomarkers , Cochlea/blood supply , Cochlea/growth & development , Cochlea/pathology , Gene Expression , Hair Cells, Auditory, Outer/blood supply , Hair Cells, Auditory, Outer/growth & development , Hair Cells, Auditory, Outer/metabolism , Hair Cells, Auditory, Outer/pathology , Hypoxia/pathology , Hypoxia/physiopathology , Ischemia/pathology , Ischemia/physiopathology , Organ Culture Techniques , Organ of Corti/blood supply , Organ of Corti/growth & development , Organ of Corti/metabolism , Organ of Corti/pathology , Proteins/analysis , Proteins/genetics , Rats , Rats, Wistar , Reverse Transcriptase Polymerase Chain Reaction , Sulfate Transporters
4.
J Comp Neurol ; 485(1): 75-85, 2005 Apr 25.
Article in English | MEDLINE | ID: mdl-15776440

ABSTRACT

The hair bundles of outer hair cells in the mature mouse cochlea possess three distinct cell-surface specializations: tip links, horizontal top connectors, and tectorial membrane attachment crowns. Electron microscopy was used to study the appearance and maturation of these link types and examine additional structures transiently associated with the developing hair bundle. At embryonic day 17.5 (E17.5), the stereocilia are interconnected by fine lateral links and have punctate elements distributed over their surface. Oblique tip links are also seen at this stage. By postnatal day 2 (P2), outer hair cell bundles have a dense cell coat, but have lost many of the lateral links seen at E17.5. At P2, ankle links appear around the base of the bundle and tectorial membrane attachment crowns are seen at the stereociliary tips. Ankle links become less apparent by P9 and are completely lost by P12. The appearance of horizontal top connectors, which persist into adulthood, occurs concomitant with this loss of ankle links. Treatment with the calcium chelator BAPTA or the protease subtilisin enabled these links to be further distinguished. Ankle links are susceptible to both treatments, tip links are only sensitive to BAPTA, and tectorial membrane attachment crowns are removed by subtilisin but not BAPTA. The cell-coat material is partially sensitive to subtilisin alone, while horizontal top connectors resist both treatments. These results indicate there is a rich, rapidly changing array of different links covering the developing hair bundle that becomes progressively refined to generate the mature complement by P19.


Subject(s)
Cochlea , Egtazic Acid/analogs & derivatives , Hair Cells, Auditory, Inner/embryology , Hair Cells, Auditory, Inner/growth & development , Hair Cells, Auditory, Outer/embryology , Hair Cells, Auditory, Outer/growth & development , Animals , Animals, Newborn , Chelating Agents/pharmacology , Cochlea/embryology , Cochlea/growth & development , Cochlea/ultrastructure , Egtazic Acid/pharmacology , Embryo, Mammalian , Hair Cells, Auditory, Inner/drug effects , Hair Cells, Auditory, Inner/ultrastructure , Hair Cells, Auditory, Outer/drug effects , Hair Cells, Auditory, Outer/ultrastructure , In Vitro Techniques , Mice , Microscopy, Electron, Scanning/methods , Subtilisin/pharmacology , Tectorial Membrane/drug effects , Tectorial Membrane/growth & development , Tectorial Membrane/ultrastructure
5.
Lin Chuang Er Bi Yan Hou Ke Za Zhi ; 17(4): 224-5, 2003 Apr.
Article in Chinese | MEDLINE | ID: mdl-12838867

ABSTRACT

OBJECTIVE: To investigate the characteristics of the ABR and discuss the development of the bundles of inner and outer hair cell. METHOD: Testing the ABR of newborn mice, the response threshold of ABR, latency of wave I were examined. Using scanning electron microscopy, the development of the bundles of inner and outer hair cell of postnatal mice were studied. RESULT: (1) The average response threshold of ABR was (57.5 +/- 2) dB of 15-day-old mice. The average response threshold of ABR was (37.5 +/- 1) dB of 17-day-old, 21-day-old and 28-day-old mice. There was no difference in wave form. (2) The latencies of wave I of ABR differed significantly (P < 0.05) in 15-day-old mice and 17-day-old mice, 21-day-old mice and 28-day-old mice. The latencies of wave I of ABR didn't differ significantly (P > 0.05) in 17-day-old mice and 21-day-old mice and 28-day-old mice. (3) The development of the bundles is interpreted as a five-step process. CONCLUSION: The stable ABR appeared at the mice of 17 days. The response threshold goes down gradually. The latency of wave I becomes shorter and shorter. The bundles of inner and outer hair cell of newborn 17-day-old mice get maturity.


Subject(s)
Evoked Potentials, Auditory, Brain Stem , Hair Cells, Auditory, Inner/growth & development , Hair Cells, Auditory, Outer/growth & development , Animals , Animals, Newborn , Hair Cells, Auditory, Inner/physiology , Hair Cells, Auditory, Inner/ultrastructure , Hair Cells, Auditory, Outer/physiology , Hair Cells, Auditory, Outer/ultrastructure , Mice , Microscopy, Electron, Scanning , Reaction Time
6.
Development ; 130(11): 2375-84, 2003 Jun.
Article in English | MEDLINE | ID: mdl-12702652

ABSTRACT

In the mammalian cochlea, stereociliary bundles located on mechanosensory hair cells within the sensory epithelium are unidirectionally oriented. Development of this planar polarity is necessary for normal hearing as stereociliary bundles are only sensitive to vibrations in a single plane; however, the mechanisms governing their orientation are unknown. We report that Wnt signaling regulates the development of unidirectional stereociliary bundle orientation. In vitro application of Wnt7a protein or inhibitors of Wnt signaling, secreted Frizzled-related protein 1 or Wnt inhibitory factor 1, disrupts bundle orientation. Moreover, Wnt7a is expressed in a pattern consistent with a role in the polarization of the developing stereociliary bundles. We propose that Wnt signaling across the region of developing outer hair cells gives rise to planar polarity in the mammalian cochlea.


Subject(s)
Hair Cells, Auditory, Outer/growth & development , Proto-Oncogene Proteins/physiology , Repressor Proteins , Zebrafish Proteins , Adaptor Proteins, Signal Transducing , Animals , Body Patterning , Carrier Proteins/pharmacology , Extracellular Matrix Proteins , Gene Expression Regulation, Developmental , Glycoproteins/pharmacology , Hair Cells, Auditory, Outer/drug effects , In Vitro Techniques , Intercellular Signaling Peptides and Proteins , Intracellular Signaling Peptides and Proteins , Mice , Mice, Inbred ICR , Mutation , Proteins/genetics , Proteins/pharmacology , Proteins/physiology , Proto-Oncogene Proteins/antagonists & inhibitors , Proto-Oncogene Proteins/genetics , Recombinant Proteins/pharmacology , Signal Transduction , Wnt Proteins
7.
Brain Res Dev Brain Res ; 139(1): 87-96, 2002 Nov 15.
Article in English | MEDLINE | ID: mdl-12414097

ABSTRACT

A recently discovered alpha10 subunit of the nicotinic acetylcholine receptor (nAChR) family is believed to form a heteromeric receptor with the alpha9 nAChR subunit in auditory hair cells. In the present study, the alpha10 nAChR subunit expression in the developing and adult rat inner ear was analyzed by PCR and localized using isotopic in situ hybridization. Unlike the alpha9 subunit, the alpha10 subunit was not detected at embryonic day 18 (E18). From E21 through postnatal day 15 (P15), the alpha10 subunit was localized over both inner hair cell (IHC) and outer hair cell (OHC) regions, but in the mature cochlea detectable levels of alpha10 mRNA were found only over the OHC region. From E21 through adult ages, there was also a small but consistent basal to apical gradient of alpha10 expression; that is, higher levels in basal regions and lower levels in apical regions. Previously, we detected the alpha9 nAChR subunit over IHCs as early as E18 and throughout adult ages with a clear basal-apical gradient of expression. Our studies raise the question of whether the alpha9 and alpha10 subunits are differentially regulated during embryonic and postnatal development.


Subject(s)
Cochlea/metabolism , RNA, Messenger/biosynthesis , Receptors, Nicotinic/biosynthesis , Aging/metabolism , Animals , Cochlea/embryology , Cochlea/growth & development , Female , Hair Cells, Auditory, Outer/embryology , Hair Cells, Auditory, Outer/growth & development , Hair Cells, Auditory, Outer/metabolism , In Situ Hybridization , Pregnancy , Protein Subunits , Rats , Rats, Sprague-Dawley , Reverse Transcriptase Polymerase Chain Reaction
8.
Brain Res Mol Brain Res ; 105(1-2): 67-78, 2002 Sep 30.
Article in English | MEDLINE | ID: mdl-12399109

ABSTRACT

Plakins, a family of linker proteins that connect cytoskeletal elements to cellular junctions and the extracellular matrix, are primarily responsible for the mechanical properties of cells and tissues. They include desmoplakin, envoplakin, plectin, dystonin/BPAG1, and Kakapo. Mutations in plakins cause several skin, muscular and neurological disorders. Macrophins are a recently discovered subfamily of plakins with binding domains for actin, intermediate filaments and microtubules. Characteristic features of macrophins include variable actin binding domains, a central rod domain containing both plectin and spectrin repeats, and a C-terminus containing EF hands and GAS2/GAR22 domain. We have examined expression of mouse Macf2, encoding macrophin-2, in adult tissues and in the developing, neonatal, and mature inner ear by in situ hybridization. Northern blot analysis identified three large tissue-specific Macf2 transcripts: a 16-kb mRNA in skeletal muscle and heart, a 15-kb mRNA in brain, and a 9-kb mRNA in RNA from ovary plus uterus. In situ hybridization of the developing mouse inner ear indicated that Macf2 is expressed in the otocyst at day 12.5, in the sensory epithelium by embryonic day 16.5, and in both inner and outer hair cells by day 16.5. Macf2 is expressed in the bodies of both sensory and motor neurons in the central and peripheral nervous system, including the auditory pathway. The Macf2 protein could be involved in the regulation of cytoskeletal connections to cellular junctions and play an important structural role in organs, such as the inner ear, that are subjected to strong mechanical forces.


Subject(s)
Cell Adhesion/genetics , Cytoskeleton/genetics , Ear, Inner/embryology , Ear, Inner/growth & development , Gene Expression Regulation, Developmental/genetics , Intercellular Junctions/genetics , Microfilament Proteins , Spectrin/genetics , Animals , Animals, Newborn , Central Nervous System/embryology , Central Nervous System/growth & development , Central Nervous System/metabolism , Cytoskeleton/metabolism , Ear, Inner/metabolism , Female , Fetus , Ganglia/embryology , Ganglia/growth & development , Ganglia/metabolism , Hair Cells, Auditory, Inner/embryology , Hair Cells, Auditory, Inner/growth & development , Hair Cells, Auditory, Inner/metabolism , Hair Cells, Auditory, Outer/embryology , Hair Cells, Auditory, Outer/growth & development , Hair Cells, Auditory, Outer/metabolism , Humans , Intercellular Junctions/metabolism , Mice , Mice, Inbred C57BL , Neurons/cytology , Neurons/metabolism , Pregnancy , RNA, Messenger/metabolism
9.
Hear Res ; 151(1-2): 149-156, 2001 Jan.
Article in English | MEDLINE | ID: mdl-11124462

ABSTRACT

During postnatal development of rat cochlear cells and the onset of hearing (10-23 days), the increasing endocochlear potential and energy requirements are largely provided by increased glucose utilization. It is well established that the ability of maturing rat tissues to use glucose is directly related to alteration of 6-phosphofructo-1-kinase (PFK) subunits. To gain insight into the alteration of PFK subunit levels in the cochlea from 6 to 60 days of age, PFK subunit types were measured in sections of paraffin-embedded temporal bone using IgG specific for each type of PFK subunit and quantified by computer image analysis. Although the L-type and C-type subunits did not exhibit statistically significant changes in the cochlear structures during maturation, the levels of M-type subunit in the stria vascularis cells, spiral ligament cell types I, II, and III, outer hair cells, inner hair cells, and support cells significantly increased. Also, the type IV and V spiral ligament fibrocytes during this period did not exhibit significant alterations of the M-type subunit. These data suggest that during neonatal development of the cochlear, the elevated levels of the M-type subunit are associated with increased glucose utilization and the onset of hearing.


Subject(s)
Cochlea/enzymology , Cochlea/growth & development , Phosphofructokinase-1/metabolism , Animals , Animals, Newborn , Cochlea/cytology , Energy Metabolism , Glucose/metabolism , Hair Cells, Auditory, Inner/cytology , Hair Cells, Auditory, Inner/growth & development , Hair Cells, Auditory, Inner/metabolism , Hair Cells, Auditory, Outer/cytology , Hair Cells, Auditory, Outer/growth & development , Hair Cells, Auditory, Outer/metabolism , Hearing/physiology , Immunohistochemistry , Phosphofructokinase-1/chemistry , Protein Subunits , Rats , Rats, Inbred F344 , Stria Vascularis/cytology , Stria Vascularis/metabolism , Tissue Distribution
10.
Eur J Neurosci ; 14(12): 1947-52, 2001 Dec.
Article in English | MEDLINE | ID: mdl-11860489

ABSTRACT

Cochlear outer hair cells (OHCs) possess a unique fast voltage-driven motility associated with a voltage-sensitive motor protein embedded in the basolateral membrane. This mechanism is believed to underlie the cochlear amplification in mammals. OHCs also have a Ca2+/calmodulin-dependent mechanical pathway which involves a submembranous circumferential cytoskeleton. The purpose of this study was to compare the functional appearance of the voltage-sensitive motor proteins with that involving the Ca2+-sensitive cytoskeleton during postnatal development of rat OHCs. We demonstrate that whole-cell electromotility and Ca2+-voked mechanical responses, by ionomycin, develop concomitantly after postnatal day 5 (P5). These two mechanical properties also develop simultaneously in OHCs isolated from two-week-old cultures of P0-P1 organs of Corti. This excludes the participation of neural innervation in the postnatal maturation of the OHCs' motile properties. In addition, we show that the expression of the membranous voltage-sensitive motor protein precedes, by several days, the appearance of whole-cell electromotility. The concomitant development of whole-cell electromotility and Ca2+-sensitive motility, both in vivo and in vitro, underlines the cytoskeleton as an important factor in the functional organization of the voltage-sensitive motor proteins within the plasma membrane.


Subject(s)
Aging/metabolism , Calcium Signaling/physiology , Cell Differentiation/physiology , Cytoskeleton/metabolism , Hair Cells, Auditory, Outer/growth & development , Hair Cells, Auditory, Outer/metabolism , Molecular Motor Proteins/metabolism , Animals , Animals, Newborn , Calcium Signaling/drug effects , Cell Membrane/drug effects , Cell Membrane/metabolism , Cell Movement/drug effects , Cell Movement/physiology , Cytoskeleton/drug effects , Electric Stimulation , Hair Cells, Auditory, Outer/cytology , Hearing/physiology , Ion Channels/drug effects , Ion Channels/metabolism , Ionomycin/pharmacology , Ionophores/pharmacology , Membrane Potentials/drug effects , Membrane Potentials/physiology , Molecular Motor Proteins/drug effects , Organ Culture Techniques , Rats , Rats, Wistar , Signal Transduction/drug effects , Signal Transduction/physiology
11.
J Comp Neurol ; 423(1): 132-9, 2000 Jul 17.
Article in English | MEDLINE | ID: mdl-10861542

ABSTRACT

It has been hypothesized that normal pruning of exuberant branching of afferent neurons in the developing cochlea is caused by the arrival of the olivocochlear efferent neurons and the resulting competition for synaptic sites on hair cells. This hypothesis was supported by a report that afferent innervation density on mature outer hair cells (OHCs) is elevated in animals deefferented at birth, before the olivocochlear system reaches the outer hair cell area (Pujol and Carlier [1982] Dev. Brain Res. 3:151-154). In the current study, this claim was evaluated quantitatively at the electron microscopic level in four cats that were de-efferented at birth and allowed to survive for 6-11 months. A semiserial section analysis of 156 OHCs from de-efferented and normal ears showed that, although de-efferentation essentially was complete in all four cases, the number and distribution of afferent terminals on OHCs was indistinguishable from normal, and the morphology of afferent synapses was normal in both the inner hair cell area and the OHC area. Thus, the postnatal presence of an efferent system is not required for the normal development of cochlear afferent innervation, and the synaptic competition hypothesis is not supported.


Subject(s)
Afferent Pathways/growth & development , Afferent Pathways/ultrastructure , Axotomy/adverse effects , Denervation/adverse effects , Hair Cells, Auditory, Inner/growth & development , Hair Cells, Auditory, Inner/ultrastructure , Hair Cells, Auditory, Outer/growth & development , Hair Cells, Auditory, Outer/ultrastructure , Vestibulocochlear Nerve Injuries , Afferent Pathways/physiology , Age Factors , Animals , Animals, Newborn , Cats , Cell Count , Cell Size , Hair Cells, Auditory, Inner/physiology , Hair Cells, Auditory, Outer/physiology , Microscopy, Electron , Nerve Degeneration/pathology , Nerve Degeneration/physiopathology , Presynaptic Terminals/pathology , Presynaptic Terminals/physiology , Presynaptic Terminals/ultrastructure , Vestibulocochlear Nerve/pathology , Vestibulocochlear Nerve/physiopathology
12.
J Comp Neurol ; 421(3): 289-301, 2000 Jun 05.
Article in English | MEDLINE | ID: mdl-10813788

ABSTRACT

Substantial in vitro and in vivo data support a role for extracellular adenosine 5;-triphosphate (ATP) and associated P2 receptors in cochlear function. However, the precise spatiotemporal distribution of the involved receptor protein(s) has not been determined. By using a specific antiserum and immunoperoxidase labeling, the tissue distribution of the P2X(2) subunit of the ATP-gated ion channel was investigated. Here, we describe the first extensive immunohistochemical mapping of P2X(2) receptor subunits in the adult and developing rat cochlea. In the adult, immunoreactivity was observed in most cells bordering on the endolymphatic compartment (scala media), particularly in the supporting cells. Hair cells were not immunostained by the P2X(2) antiserum, except for outer hair cell stereocilia. In addition, weak immunolabeling was observed in some spiral ganglion neurons. P2X(2) receptor subunit protein expression during labyrinthine ontogeny was detected first on embryonic day 19 in the spiral ganglion and in associated nerve fibers extending to the inner hair cells. Immunostaining also was observed underneath outer hair cells, and, by postnatal day 6 (P6), intense immunolabeling was seen in the synaptic regions of both types of hair cell. Supporting cells of the sensory epithelium were labeled at P0. This labeling became most prominent from the onset of cochlear function (P8-P12). Conversely, expression in the vascular stria declined from this time. By P21, the pattern of immunolabeling was similar to that found in the adult. The localization and timing of P2X(2) immunoreactivity suggest involvement of extracellular ATP and associated ATP-gated ion channels in important physiological events, such as inner ear ontogeny, sound transduction, cochlear micromechanics, electrochemical homeostasis, and auditory neurotransmission.


Subject(s)
Adenosine Triphosphate/metabolism , Cochlea/metabolism , Ion Channels/metabolism , Receptors, Purinergic P2/metabolism , Animals , Cochlea/growth & development , Female , Hair Cells, Auditory, Inner/growth & development , Hair Cells, Auditory, Inner/metabolism , Hair Cells, Auditory, Outer/growth & development , Hair Cells, Auditory, Outer/metabolism , Pregnancy , Rats , Rats, Wistar , Receptors, Purinergic P2X2 , Spiral Ganglion/growth & development , Spiral Ganglion/metabolism
13.
J Physiol ; 519 Pt 3: 791-800, 1999 Sep 15.
Article in English | MEDLINE | ID: mdl-10457091

ABSTRACT

1. The non-linear capacitance (Cnon-lin) of postnatal outer hair cells (OHCs) of the rat was measured by a patch-clamp lock-in technique. Cnon-lin is thought to result from a membrane protein that provides the molecular basis for the unique electromotility of OHCs by undergoing conformational changes in response to changes in membrane potential (Vm). Protein conformation is coupled to Vm by a charged voltage sensor, which imposes Cnon-lin on the OHC. Cnon-lin was investigated in order to characterize the surface expression and voltage dependence of this motor protein during postnatal development. 2. On the day of birth (P0), Cnon-lin was not detected in OHCs of the basal turn of the cochlea, whilst it was 89 fF in apical OHCs. Cnon-lin increased gradually during postnatal development and reached 2.3 pF (basal turn, P9) and 7.5 pF (apical turn, P14) at the oldest developmental stages covered by our measurements. The density of the protein in the plasma membrane, deduced from non-linear charge movement per membrane area, increased steeply between P6 and P11 and reached steady state (4200 e- microm-2) at about P12. 3. Voltage at peak capacitance (V) shifted with development from hyperpolarized potentials shortly after birth (-88.3 mV, P2) to the depolarized potential characteristic of mature OHCs (-40.8 mV, P14). This developmental difference in V was also observed in outside-out patches immediately after patch excision. During subsequent wash-out V shifted towards the depolarized value found in the adult state, suggesting a direct modulation of the molecular motor. 4. Thus, the density of the motor protein in the plasma membrane and also its voltage dependence change concomitantly in the postnatal period and reach adult characteristics right at the onset of hearing.


Subject(s)
Hair Cells, Auditory, Outer/growth & development , Muscle Proteins/physiology , Animals , Electric Conductivity , Electrophysiology , Guinea Pigs , Membrane Potentials , Rats , Rats, Wistar
14.
Nat Genet ; 21(3): 289-92, 1999 Mar.
Article in English | MEDLINE | ID: mdl-10080181

ABSTRACT

The mammalian cochlea contains an invariant mosaic of sensory hair cells and non-sensory supporting cells reminiscent of invertebrate structures such as the compound eye in Drosophila melanogaster. The sensory epithelium in the mammalian cochlea (the organ of Corti) contains four rows of mechanosensory hair cells: a single row of inner hair cells and three rows of outer hair cells. Each hair cell is separated from the next by an interceding supporting cell, forming an invariant and alternating mosaic that extends the length of the cochlear duct. Previous results suggest that determination of cell fates in the cochlear mosaic occurs via inhibitory interactions between adjacent progenitor cells (lateral inhibition). Cells populating the cochlear epithelium appear to constitute a developmental equivalence group in which developing hair cells suppress differentiation in their immediate neighbours through lateral inhibition. These interactions may be mediated through the Notch signalling pathway, a molecular mechanism that is involved in the determination of a variety of cell fates. Here we show that genes encoding the receptor protein Notch1 and its ligand, Jagged 2, are expressed in alternating cell types in the developing sensory epithelium. In addition, genetic deletion of Jag2 results in a significant increase in sensory hair cells, presumably as a result of a decrease in Notch activation. These results provide direct evidence for Notch-mediated lateral inhibition in a mammalian system and support a role for Notch in the development of the cochlear mosaic.


Subject(s)
Cochlea/growth & development , Gene Expression Regulation, Developmental , Hair Cells, Auditory, Outer/growth & development , Membrane Proteins/genetics , Membrane Proteins/metabolism , Receptors, Cell Surface , Transcription Factors , Animals , Calcium-Binding Proteins , Carrier Proteins/genetics , Carrier Proteins/metabolism , Cell Differentiation/genetics , Cochlea/cytology , Cochlea/embryology , Drosophila Proteins , Embryonic Induction/genetics , Female , Hair Cells, Auditory, Outer/pathology , Intercellular Signaling Peptides and Proteins , Jagged-1 Protein , Jagged-2 Protein , Male , Mammals , Mice , Mice, Mutant Strains , Morphogenesis/genetics , Mutation , Organ of Corti/embryology , Organ of Corti/physiology , Pregnancy , Proteins/genetics , Proteins/metabolism , Receptor, Notch1 , Serrate-Jagged Proteins , Signal Transduction
15.
Hear Res ; 127(1-2): 1-13, 1999 Jan.
Article in English | MEDLINE | ID: mdl-9925011

ABSTRACT

This study quantitatively characterizes the development of the major morphological features of the organ of Corti during the first 2 weeks postnatal, the period when the cat auditory system makes the transition from being essentially non-functional to having nearly adult-like responses. Four groups of kittens (n = 3) were studied at one day postnatal (P1), P5, P10, P15, and compared to adults. Measurements were made of the organ of Corti at 3 cochlear locations: 20%, 60% and 85% of basilar membrane length from the base cochlear locations which in the adult correspond to best frequencies of approximately 20 kHz, 2 kHz and 500 Hz, respectively. In addition, measurements of basilar membrane length and opening of the tunnel of Corti were made in 20 cochlear specimens from kittens aged P0-P6. Results indicate that: (i) at P0 the basilar membrane has attained adult length, and the tunnel of Corti is open over approximately the basal one-half of the cochlea; (ii) the initial opening of the tunnel of Corti occurs at a site about 4 mm from the cochlear base (best frequency of approximately 25 kHz in the adult cochlea); (iii) the thickness of the tympanic cell layer decreases markedly at the basal 20-kHz location; (iv) the areas of the tunnel of Corti and space of Nuel and the angulation of the inner hair cells (IHC) relative to the basilar membrane all show marked postnatal increases at both the middle and apical locations; (v) IHC are nearly adult-like in length and shape at birth, whereas the OHC (at 2-kHz and 500-Hz locations) undergo marked postnatal changes; (vi) disappearance of the marginal pillars and maturation of the supporting cells are not yet complete by P15.


Subject(s)
Cats/anatomy & histology , Cats/growth & development , Organ of Corti/anatomy & histology , Organ of Corti/growth & development , Animals , Animals, Newborn , Basilar Membrane/anatomy & histology , Basilar Membrane/growth & development , Ear, Middle/anatomy & histology , Ear, Middle/growth & development , Hair Cells, Auditory, Inner/anatomy & histology , Hair Cells, Auditory, Inner/growth & development , Hair Cells, Auditory, Outer/anatomy & histology , Hair Cells, Auditory, Outer/growth & development
16.
Pflugers Arch ; 439(1-2): 113-22, 1999 Dec.
Article in English | MEDLINE | ID: mdl-10651007

ABSTRACT

Inwardly rectifying K+ currents in inner and outer hair cells (IHCs, OHCs) were studied during post-natal development of the mouse cochlea. Hyperpolarizing steps from a holding potential of -64 mV induced a rapidly activating current in both cell types. This current showed strong inward rectification around the K+ equilibrium potential and, at potentials negative to -130 mV, partial inactivation. The activation range varied with extracellular K+ concentration. External application of Ba2+ and Cs+ reversibly blocked the elicited current. The results are consistent with the presence of an IK1-type inwardly rectifying potassium conductance in these cells. The maximum current was 60% larger in IHCs than in OHCs. In OHCs, but not IHCs, the amplitude of IK1 varied significantly with the cells' position along the cochlea. IK1 was maximal in cells located in the most basal region of the cochlea and its amplitude decreased in the apical coil. IK1 disappeared upon functional maturation: in OHCs at the end of the first postnatal week, and in IHCs at the onset of auditory function 12 days after birth. The current is active at the resting potential of the cells and plays a role in regulating the spiking behaviour characteristic of developing hair cells.


Subject(s)
Cochlea/metabolism , Hair Cells, Auditory, Inner/metabolism , Hair Cells, Auditory, Outer/metabolism , Potassium Channels, Inwardly Rectifying , Potassium Channels/biosynthesis , Algorithms , Animals , Barium/pharmacology , Cesium/pharmacology , Electric Stimulation , Electrophysiology , Hair Cells, Auditory, Inner/drug effects , Hair Cells, Auditory, Inner/growth & development , Hair Cells, Auditory, Outer/drug effects , Hair Cells, Auditory, Outer/growth & development , In Vitro Techniques , Male , Membrane Potentials/physiology , Mice , Patch-Clamp Techniques , Potassium Channel Blockers , RNA, Messenger/biosynthesis
17.
Eur J Neurosci ; 10(3): 907-15, 1998 Mar.
Article in English | MEDLINE | ID: mdl-9753158

ABSTRACT

Physiological evidence suggests that SK-type Ca2+-activated K+ channels participate in ACh-induced hyperpolarization of OHCs (outer hair cells). Based on the sequences published by Kohler et al. [(1996), Science, 273: 1709), we designed degenerated primers recognizing cDNA subunits of rSK1, rSK2 and rSK3. Using this consensus set of primers, we probed by PCR a rat organ of Corti cDNA library. Two PCR products of 707 base pairs with sequence identical to rSK3 and rSK2 were obtained and cloned to generate RNA probes for in situ hybridization in the rat cochlea. The subunit rSK2 showed hybridization in the organ of Corti, at the location of the OHCs. The expression of rSK2 by OHCs was confirmed by probing with PCR a poly(A) amplified OHC cDNA library. During development, rSK2 hybridization in the organ of Corti was negative at embryonic days E16, E18 and at P0, weak at P4 and stronger from P8 to adulthood. The subunit rSK2 could also be detected in the spiral ganglion from P4 to the adult stage. Contrary to rSK2, the subunit rSK3 did not show specific hybridization in the organ of Corti at the adult stage (P120) and only a weak expression was observed at P10 and P21. Our study demonstrates expression of rSK2 in OHCs. These potassium channels are good candidates to underlie the ACh-activated K+ currents recorded during patch-clamp recordings in isolated OHCs. The expression of rSK2 in the cochlear ganglion at the adult stage suggests that SK Ca2+-activated K+ channels may also participate in the repolarization of the auditory neurons after the action potential and may influence their firing patterns.


Subject(s)
Calcium/physiology , Cochlea/physiology , Hair Cells, Auditory, Outer/physiology , Potassium Channels/physiology , Animals , Cloning, Molecular , Cochlea/cytology , Cochlea/embryology , Hair Cells, Auditory, Outer/growth & development , In Situ Hybridization , In Vitro Techniques , Membrane Potentials/physiology , Organ of Corti/embryology , Parasympathetic Nervous System/cytology , Parasympathetic Nervous System/physiology , Patch-Clamp Techniques , Polymerase Chain Reaction , Rats , Rats, Sprague-Dawley , Transcription, Genetic
18.
Hear Res ; 121(1-2): 125-38, 1998 Jul.
Article in English | MEDLINE | ID: mdl-9682815

ABSTRACT

Suppression of the 2f1-f2 distortion product otoacoustic emission (DPOAE) provides an effective paradigm for the study of functional cochlear maturation in humans. DPOAE iso-suppression tuning curves (STCs) represent some aspect of peripheral filtering, probably related to the boundaries of distortion generation. Studies conducted thus far suggest that the cochlear tuning assessed by this technique is adult-like in humans by term birth (Abdala et al., Hear. Res. 98 (1996) 38-53; Abdala and Sininger, Ear Hear. 17 (1996) 374-385). However, there have been no studies of cochlear tuning in premature human neonates. DPOAE STCs and suppression growth functions were measured from 14 normal-hearing adults, 33 term and 85 premature neonates to investigate the developmental time course of cochlear frequency resolution and non-linearity. Premature neonates showed non-adult-like DPOAE suppression at f2 of 1500 and 6000 Hz: (1) STCs were narrower in width (Q10) and steeper in slope on the low-frequency flank of the tuning curve; (2) suppressor tones lower in frequency than f2 produced atypically shallow growth of DPOAE suppression. The influence of immature conductive pathways cannot be entirely ruled out as a factor contributing to these results. However, findings may indicate that an immaturity exists in cochlear frequency resolution and non-linearity just prior to term birth. The bases of this immaturity are hypothesized to be outer hair cell in origin.


Subject(s)
Cochlea/growth & development , Otoacoustic Emissions, Spontaneous/physiology , Adolescent , Adult , Audiometry , Auditory Threshold/physiology , Hair Cells, Auditory, Outer/growth & development , Humans , Infant, Newborn , Infant, Premature , Software
19.
Brain Res Dev Brain Res ; 103(1): 95-7, 1997 Oct 20.
Article in English | MEDLINE | ID: mdl-9370065

ABSTRACT

Mammalian outer hair cells (OHCs) contain Ca and K channels in their synaptic pole. We questioned if the ontogeny of potassium currents of OHCs depends on the neural induction of early afferent contact. By recording whole-cell currents of OHCs grown in organotypic cultures deprived of afferent innervation, we show that a Ca-activated K channel is expressed in these cells, suggesting that the ontogeny of the K channel is an intrinsic process.


Subject(s)
Auditory Pathways/physiology , Gene Expression Regulation, Developmental , Hair Cells, Auditory, Outer/physiology , Organ of Corti/physiology , Potassium Channels/biosynthesis , Animals , Animals, Newborn , Auditory Pathways/growth & development , Cells, Cultured , Gerbillinae , Hair Cells, Auditory, Outer/growth & development , Organ Culture Techniques , Synapses/physiology
20.
Pflugers Arch ; 434(6): 772-8, 1997 Nov.
Article in English | MEDLINE | ID: mdl-9306011

ABSTRACT

Outer hair cells of the cultured organ of Corti from newborn rats (0-11 days after birth) were studied in the whole-cell patch-clamp configuration. A voltage-activated sodium current was detected in 97% (n = 109) of the cells at 0-9 days after birth. The properties of this current were: (1) its activation and inactivation kinetics were fast and voltage-dependent, (2) the voltage at half-maximum activation was -45.0 mV, (3) its steady-state inactivation was temperature-sensitive (the half-inactivating voltage was -92.6 mV at 23 degrees C and -84.8 mV at 37 degrees C), (4) the reversal potential (80 mV) was close to the sodium equilibrium potential and currents could be abolished by the removal of extracellular sodium, and (5) tetrodotoxin blocked the current with a Kd of 474 nmol/l. Current amplitudes were up to 1.7 nA at room temperature. Mean current amplitudes showed a developmental time course with a maximum at postnatal days 3 and 7 for outer hair cells from the basal and apical part of the cochlea, respectively. In current-clamp mode cells had membrane potentials of -59.7 +/- 11.7 mV (n = 9). When cells were hyperpolarized by constant current injection, depolarizing currents were able to trigger action potentials. At 18 days after birth, sodium currents were greatly reduced and barely detectable. The results show that, unlike adult outer hair cells, immature outer hair cells regularly express voltage-gated sodium channels. However, due to mismatching of the sodium current inactivation range and membrane potential in vitro, a physiological function appears questionable.


Subject(s)
Aging/physiology , Animals, Newborn/physiology , Hair Cells, Auditory, Outer/physiology , Sodium/physiology , Animals , Animals, Newborn/growth & development , Electric Conductivity , Hair Cells, Auditory, Outer/growth & development , Patch-Clamp Techniques , Rats
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