Abstract:
:The saccule and the utricle of the vestibular system detect linear acceleration and gravity. Sensory transduction in these organs depends on myriads of calcium carbonate crystals of high specific gravity, called otoconia, embedded in a filament matrix that overlies the sensory epithelium. The coexistence of hard crystals and slender filaments in this complex extracellular matrix makes it difficult to analyze by conventional electron microscopy. We have now examined this structure in the bullfrog saccule using the quick-freeze, deep-etch replica technique. The otoconia in their typical aragonite polymorph shape exhibit smooth surfaces and are embedded in a loose matrix made of two types of filaments. The regular surface of the otoconia forms a natural smooth background against which we could observe with unprecedented detail the network organization and substructure of the filaments. One type of filament is 8 nm in diameter, while the other, which has a characteristic beaded appearance, is 15 nm in diameter. Both types of filaments either make lateral connections with or end directly on the surface of the otoconia. A consistent observation was the presence of short filaments that directly cross-link adjacent otoconia. Very few otoconia were fractured in an orientation that would allow the study of their internal architecture. These otoconia presented a typical conchoidal cleavage of aragonite. Although crystallites were not clearly apparent, thin lamellar microstructures appeared oriented both perpendicularly and longitudinally to the major otoconial axis. This structural study establishes a framework for the identification of the molecular components present in this unique extracellular matrix and may also help elucidate their role in mechanical transduction.
journal_name
Hear Resjournal_title
Hearing researchauthors
Kurc M,Farina M,Lins U,Kachar Bdoi
10.1016/s0378-5955(99)00007-6keywords:
subject
Has Abstractpub_date
1999-05-01 00:00:00pages
11-21issue
1-2eissn
0378-5955issn
1878-5891pii
S0378-5955(99)00007-6journal_volume
131pub_type
杂志文章相关文献
HEARING RESEARCH文献大全abstract::The US Navy, through an Office of Naval Research (ONR) lead effort on Noise Induced Hearing Loss (NIHL), is investigating methods and techniques to mitigate hearing loss for the crews and warfighters. Hearing protection is a viable and increasingly popular method of reducing hearing exposure for many ship crew members...
journal_title:Hearing research
pub_type: 杂志文章
doi:10.1016/j.heares.2017.01.004
更新日期:2017-06-01 00:00:00
abstract::The directional dependence of sound pressure transformation of head and pinna has been measured in the phyllostomid bat Phyllostomus discolor for the frontal hemisphere using a maximum length sequence method. The azimuthal position of the axis of highest pinna gain came closer to the midsagital plane with increasing f...
journal_title:Hearing research
pub_type: 杂志文章
doi:10.1016/s0378-5955(03)00164-3
更新日期:2003-07-01 00:00:00
abstract::A small, acidic Ca(2+)-binding protein (CBP-15) was recently detected in extracts of the mammalian auditory receptor organ, the organ of Corti [Senarita et al. (1995) Hear. Res. 90, 169-175]. N-terminal sequence data for CBP-15 [Thalmann et al. (1995) Biochem. Biophys. Res. Commun. 215, 142-147] implied membership in ...
journal_title:Hearing research
pub_type: 杂志文章
doi:10.1016/s0378-5955(97)00005-1
更新日期:1997-04-01 00:00:00
abstract::Previous experiments have shown that, in principle, the addition of noise to any vowel coded by an analogue multichannel cochlear implant can enhance the representation of formant information by the temporal pattern of evoked nerve discharges. The optimal addition of noise to some vowel stimuli caused a largely unifor...
journal_title:Hearing research
pub_type: 杂志文章
doi:10.1016/s0378-5955(99)00063-5
更新日期:1999-07-01 00:00:00
abstract::Sound-induced displacement responses in the plane of the organ of Corti were studied in the apical turn in the isolated temporal-bone preparation of the guinea-pig cochlea. Swept sinusoidal sound stimuli (100-500 Hz) were delivered closed-field to the external auditory meatus. The surface of the organ of Corti was con...
journal_title:Hearing research
pub_type: 杂志文章
doi:10.1016/0378-5955(95)00002-l
更新日期:1995-03-01 00:00:00
abstract::Behavioral studies on complex sound perception in goldfish were carried out in order to help determine what, if any, differences exist between the sense of hearing of fishes and other vertebrates. A stimulus generalization paradigm was used with classical conditioning in three experiments to determine: (1) the percept...
journal_title:Hearing research
pub_type: 杂志文章
doi:10.1016/0378-5955(95)00132-8
更新日期:1995-09-01 00:00:00
abstract::Aldosterone-Type I and dexamethasone-Type II/IB receptor complexes were identified in cytosol prepared from both cochlear and vestibular tissue samples. The specific binding capacity of Type I receptors in the cochlear tissues was approximately equal to that in the vestibular tissues. Likewise, the binding capacity of...
journal_title:Hearing research
pub_type: 杂志文章
doi:10.1016/0378-5955(89)90013-0
更新日期:1989-09-01 00:00:00
abstract::In this study, which aims to investigate for the first time auditoty sensitivity in congenital central hypothyroidism (CH), we concluded that: (1) permanent sensorineural hearing loss may be observed not only in congenital primary disorders of thyroid function, as reported hitherto; (2) it may also be found in patient...
journal_title:Hearing research
pub_type: 杂志文章
doi:10.1016/s0378-5955(02)00515-4
更新日期:2002-10-01 00:00:00
abstract::The endocochlear potential and Na+ activity in the endolymph were simultaneously measured with a double-barreled Na+ selective liquid membrane electrode. The modified Na+ conductance and permeability coefficient of the endolymph-perilymph barrier were calculated from the rate of change in the endolymph Na+ concentrati...
journal_title:Hearing research
pub_type: 杂志文章
doi:10.1016/0378-5955(84)90045-5
更新日期:1984-08-01 00:00:00
abstract::Unlike the organ of Corti in mammals, the avian basilar papilla has no distinct populations of hair cells. Instead, there is a continuous change between the extreme forms (tall hair cells = THC, and short hair cells = SHC). The hair-cell innervation pattern is complicated, there being no simple gradient between THC (m...
journal_title:Hearing research
pub_type: 杂志文章
doi:10.1016/0378-5955(92)90048-r
更新日期:1992-08-01 00:00:00
abstract::The frequency-modulation following response (FMFR) is a steady-state evoked response which may be a neural correlate of frequency discrimination. Aged subjects with normal hearing have abnormal frequency discrimination for low carrier frequencies and thus it might be predicted that aged individuals would have reduced ...
journal_title:Hearing research
pub_type: 杂志文章
doi:10.1016/s0378-5955(01)00398-7
更新日期:2002-03-01 00:00:00
abstract::Immunophilin FK binding protein-12 (FKBP-12), the soluble receptor for the immunosuppressant drug FK506, is involved in a number of neuronal activities including increased nerve regeneration in the peripheral nervous system and enhanced recovery in animal models of neurodegenerative diseases. In addition, FKBP-12 is t...
journal_title:Hearing research
pub_type: 杂志文章
doi:10.1016/s0378-5955(01)00319-7
更新日期:2001-09-01 00:00:00
abstract::Auditory brainstem responses (ABRs) were evoked in developing wallabies by click and tone burst stimuli delivered by bone conduction and air conduction, at progressive stages of post-natal (pouch) life. ABRs were recorded through the onset of auditory responses (95-110 days), the opening of the external ear canal (125...
journal_title:Hearing research
pub_type: 杂志文章
doi:10.1016/s0378-5955(97)00211-6
更新日期:1998-03-01 00:00:00
abstract::Guinea pigs were exposed to pure tones of 10 kHz at intensities between 98 and 115 dB SPL for 5-30 min, to produce varying degrees of acoustic trauma. Changes in auditory thresholds were measured electrophysiologically, and the animals were immediately fixed for scanning electron microscopy. Correlation between morpho...
journal_title:Hearing research
pub_type: 杂志文章
doi:10.1016/s0378-5955(96)00092-5
更新日期:1996-09-15 00:00:00
abstract::Responses were recorded from single, auditory nerve fibres in the anaesthetized cat. Acoustic stimuli consisted of two tones, one of which was at characteristic frequency (CF), the other (the suppressor) was at considerably lower frequency. Tones were presented in simultaneous and sequential configurations. For simult...
journal_title:Hearing research
pub_type: 杂志文章
doi:10.1016/0378-5955(92)90167-l
更新日期:1992-12-01 00:00:00
abstract::The course, distribution and termination of single efferent fibers to the cochlea has been described in only a few animals and relatively few fibers have been studied with knowledge of their ipsilateral or contralateral origin. In order to examine the efferent fibers in the mouse, the anterograde tracer Phaseolus vulg...
journal_title:Hearing research
pub_type: 杂志文章
doi:10.1016/0378-5955(91)90096-r
更新日期:1991-09-01 00:00:00
abstract::Normotensive and spontaneously hypertensive rats (SHRs) were given arterial infusions of saline and pentoxifylline in doses of 1.5, 2.0, and 3.0 mg/kg/min. Blood pressure decreased in a dose related fashion with increasing doses of pentoxifylline. Cochlear blood flow, measured via laser Doppler flowmeter, increased wi...
journal_title:Hearing research
pub_type: 杂志文章
doi:10.1016/0378-5955(88)90059-7
更新日期:1988-11-01 00:00:00
abstract::Six utricular hair bundles from a red-eared turtle are modeled using 3-D finite element analysis. The mechanical model includes shear deformable stereocilia, realignment of all forces during force load increments, and tip and lateral link inter-stereocilia connections. Results show that there are two distinct bundle t...
journal_title:Hearing research
pub_type: 杂志文章
doi:10.1016/j.heares.2004.06.006
更新日期:2004-11-01 00:00:00
abstract::Caloric restriction (CR) slows aging in many species and protects some animals from age-related hearing loss (ARHL), but the effect on humans is not yet known. Because rhesus monkeys are long-lived primates that are phylogenically closer to humans than other research animals are, they provide a better model for studyi...
journal_title:Hearing research
pub_type: 杂志文章
doi:10.1016/j.heares.2010.01.006
更新日期:2010-03-01 00:00:00
abstract::We studied hair cell regeneration in the crista ampullaris of the lizard Podarcis sicula both in untreated animals and at early and late time intervals following a single high dose of gentamicin. The study was carried out using the S-phase marker 5-bromo-2'-deoxyuridine. Our ultrastructural and immunofluorescence stud...
journal_title:Hearing research
pub_type: 杂志文章
doi:10.1016/s0378-5955(03)00040-6
更新日期:2003-04-01 00:00:00
abstract::Reported are the results of analyses of three-channel Lissajous trajectories (3CLTs) of the auditory brain stem responses (ABRs) in a human subject in whom a focal lesion of the brain stem was caused by stereotactic radiosurgery, the 'gamma knife'. The surgery caused total destruction of the right inferior colliculus....
journal_title:Hearing research
pub_type: 杂志文章
doi:10.1016/0378-5955(94)90210-0
更新日期:1994-01-01 00:00:00
abstract::Amplitude modulation (AM) is an important temporal cue for precise speech and complex sound recognition. However, functional decline of the auditory periphery as well as degradation of central auditory processing due to aging can reduce the salience and resolution of temporal cues. Age-related deficits in central temp...
journal_title:Hearing research
pub_type: 杂志文章
doi:10.1016/j.heares.2015.07.017
更新日期:2015-09-01 00:00:00
abstract::Input-specific remodeling is observed both in the primary auditory cortex (AI) and the ventral division of the medial geniculate body of the thalamus (MGBv) through motivation such as learning. Here, we show the role of AI in the MGBv remodeling induced by the electrical stimulation (ES) of the central division of the...
journal_title:Hearing research
pub_type: 杂志文章
doi:10.1016/j.heares.2015.06.016
更新日期:2015-10-01 00:00:00
abstract::To assess the effects of extracochlear electrical stimulation on cochlear structure, guinea pigs were implanted and stimulated with single middle ear electrodes either at round window or promontory sites, and their cochleae examined by transmission electron microscopy. Implanted but unstimulated, or unimplanted contro...
journal_title:Hearing research
pub_type: 杂志文章
doi:10.1016/0378-5955(87)90214-0
更新日期:1987-11-01 00:00:00
abstract::The endocochlear potential (EP) provides part of the electrochemical drive for sound-driven currents through cochlear hair cells. Intense noise exposure (110 dB SPL, 2 h) differentially affects the EP in three inbred mouse strains (C57BL/6 [B6], CBA/J [CBA], BALB/cJ [BALB]) (Ohlemiller and Gagnon, 2007, Hearing Resear...
journal_title:Hearing research
pub_type: 杂志文章
doi:10.1016/j.heares.2018.01.015
更新日期:2018-04-01 00:00:00
abstract::It is known that the threshold of an acoustically induced middle-ear-muscle (MEM) reflex can be lowered by the simultaneous presentation of a second tone (facilitator), which is presented to the ipsilateral or contralateral ear at a level below the acoustic reflex threshold (ART) of the facilitator itself (Sesterhenn ...
journal_title:Hearing research
pub_type: 杂志文章
doi:10.1016/s0378-5955(97)00039-7
更新日期:1997-06-01 00:00:00
abstract::Cochlear implant insertion should be as least traumatic as possible in order to reduce trauma to the cochlear sensory structures. The force applied to the cochlea during array insertion should be controlled to limit insertion-related damage. The relationship between insertion force and histological traumatism remains ...
journal_title:Hearing research
pub_type: 杂志文章
doi:10.1016/j.heares.2016.11.002
更新日期:2017-02-01 00:00:00
abstract::The pupil dilation response is sensitive both to listening effort and the emotional significance of a task. We aimed to assess the influence of evaluative feedback on the pupil dilation response using a speech reception threshold (SRT) task. Besides the pupil dilation response, we acquired subjective ratings and two p...
journal_title:Hearing research
pub_type: 杂志文章
doi:10.1016/j.heares.2019.07.005
更新日期:2019-09-15 00:00:00
abstract::Carbohydrate distribution in the fresh utricular macula of the guinea pig was analysed using lectins such as Concanavalin A (ConA), Dolichos biflorus agglutinin (DBA), peanut agglutinin (PNA), soybean agglutinin (SBA), Ulex europeus agglutinin (UEA-1) and wheat germ agglutinin (WGA) by means of confocal laser scanning...
journal_title:Hearing research
pub_type: 杂志文章
doi:10.1016/0378-5955(95)00075-f
更新日期:1995-07-01 00:00:00
abstract::Mammalian aquaporins constitute a family of so far 10 related water channel proteins which mediate osmotically driven water fluxes across the plasma membrane. Because regulation of the ionic composition and osmolality of inner ear fluids is of great functional significance, we investigated the expression patterns of a...
journal_title:Hearing research
pub_type: 杂志文章
doi:10.1016/s0378-5955(99)00036-2
更新日期:1999-06-01 00:00:00