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The Vestibular System

The Vestibular System

The vestibular system is a set of inner ear structures that provide a sense of balance and spatial orientation. This system is comprised of structures within the labyrinth of the inner ear, including the cochlea and two otolith organs—the utricle and saccule. The labyrinth also contains three semicircular canals—superior, posterior, and horizontal—that are oriented on different planes.

Equilibrium and Balance

Equilibrium and Balance

The inner ear assumes dual functionalities of auditory perception and equilibrium maintenance. The vestibule is the organ responsible for balance. This organ contains mechanoreceptors, specifically hair cells, endowed with stereocilia, which aid in deciphering information regarding the position and motion of our heads. Two intrinsic components, the utricle and saccule, help perceive head position, while the semicircular canals track head movement. Neurological messages initiated in the...

Unrenewable Cells

Unrenewable Cells

In humans, the photoreceptor cells of the eye and sensory hair cells of the ear lack stem cells. These cells are thus unrenewable and cannot be replaced when they are damaged or destroyed.
Photoreceptors
The retina is composed of several layers and contains specialized cells called photoreceptors. The photoreceptors (rods and cones) change their membrane potential when stimulated by light energy. There are two types of photoreceptors—rods and cones—which differ in the shape of...

Teratogenicity

Teratogenicity

The ability of a drug to produce structural deformations and functional abnormalities in the developing embryo or the fetus is called teratogenicity, and the drug producing this effect is known as a teratogen. Teratogenic effects include stillbirth, miscarriage, intrauterine growth restriction, and neurocognitive delay. A teratogen may affect the embryo at different stages of development, which is important in determining the type and extent of the damage. During blastocyst formation, the early...

Auditory Pathway

Auditory Pathway

Auditory pathways constitute the complex neural circuits responsible for transmitting and interpreting auditory information from the peripheral auditory system to the brain. Sound waves are initially captured by the outer ear, funneled through the ear canal, and reach the tympanic membrane (eardrum). These vibrations are transmitted via the middle ear's ossicles to the inner ear's cochlea.
When viewed cross-sectionally, the cochlea reveals the scala vestibuli and scala tympani flanking...

The Cochlea

The Cochlea

The cochlea is a coiled structure in the inner ear that contains hair cells—the sensory receptors of the auditory system. Sound waves are transmitted to the cochlea by small bones attached to the eardrum called the ossicles, which vibrate the oval window that leads to the inner ear. This causes fluid in the chambers of the cochlea to move, vibrating the basilar membrane.

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Related Experiment Video

Updated: Dec 8, 2025

The Mouse Round-window Approach for Ototoxic Agent Delivery: A Rapid and Reliable Technique for Inducing Cochlear Cell Degeneration

The Mouse Round-window Approach for Ototoxic Agent Delivery: A Rapid and Reliable Technique for Inducing Cochlear Cell Degeneration

Published on: November 26, 2015

Hydroxypropyl-β-cyclodextrin causes massive damage to the developing auditory and vestibular system.

Dalian Ding¹, Senthilvelan Manohar¹, Haiyan Jiang¹

¹Center for Hearing and Deafness, University at Buffalo, 137 Cary Hall, Buffalo, NY 14214, United States.

Hearing Research

|September 21, 2020

Summary

This summary is machine-generated.

2-hydroxypropyl-β-cyclodextrin (HPβCD) causes hearing loss by damaging hair cells. Postnatal rat inner ears show greater HPβCD toxicity than adults, affecting more cell types and potentially due to higher drug bioavailability or developmental vulnerability.

Keywords:

Cyclodextrin Hearing loss Inner hair cells Ototoxic Outer hair cells Spiral ganglion Vestibular ganglion Vestibular hair cells

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Published on: March 8, 2017

Area of Science:

Ototoxicity research
Neuroscience
Developmental biology

Background:

2-hydroxypropyl-β-cyclodextrin (HPβCD) is a cholesterol chelator used for Niemann-Pick C1 disease.
HPβCD causes hearing loss in mammals by destroying outer hair cells.
Cholesterol is crucial for early neural development.

Purpose of the Study:

To investigate the hypothesis that HPβCD causes more extensive damage to postnatal cochlear and vestibular structures than adult rat structures.
To compare the in vivo and in vitro effects of HPβCD on developing and adult inner ear structures.

Main Methods:

HPβCD was administered to adult rats and postnatal day 3 (P3) cochlear and vestibular organ cultures.
Hearing impairment and hair cell loss were assessed in adult rats.
Histopathology, mechanotransduction disruption, stereocilia damage, and apoptosis pathways (caspase-8, caspase-3) were analyzed in P3 cultures.

Main Results:

Adult rats treated with HPβCD showed dose-dependent hearing impairment and outer hair cell loss.
HPβCD-induced damage was more severe and widespread in P3 cochlear and vestibular cultures compared to adults.
P3 cultures exhibited destruction of outer and inner hair cells, neurons, and ganglion cells, with early damage involving mechanotransduction and stereocilia.
HPβCD triggered apoptosis via caspase-8 and caspase-3 pathways in P3 cultures.

Conclusions:

HPβCD is toxic to all types of postnatal cochlear and vestibular hair cells and neurons in vitro.
In vivo, HPβCD primarily damages outer hair cells in adult cochleae.
Greater drug bioavailability in vitro and/or increased vulnerability of the developing inner ear may explain the more severe damage in postnatal cultures.