Related Experiment Video

Updated: Jun 10, 2026

Trans-Tympanic Drug Delivery for the Treatment of Ototoxicity
09:52

Trans-Tympanic Drug Delivery for the Treatment of Ototoxicity

Published on: March 16, 2018

Cellular mechanisms of aminoglycoside ototoxicity

Mark E Warchol1

  • 1Department of Otolaryngology, Washington University School of Medicine, St Louis, Missouri 63110, USA. warcholm@ent.wustl.edu

Current Opinion in Otolaryngology & Head and Neck Surgery
|August 19, 2010
PubMed
Abstract

Insights

Aminoglycoside antibiotics harm sensory hair cells by entering through mechanotransduction channels, triggering cell death pathways. While heat shock proteins offer protection, new research on deafness mutations highlights mitochondrial roles in this ototoxicity.

Area of Science:

  • Ototoxicity research
  • Cellular biology
  • Pharmacology

Background:

  • Aminoglycoside antibiotics are widely used but can cause hearing loss.
  • Sensory hair cells in the inner ear are particularly vulnerable to these drugs.
  • Understanding the mechanisms of aminoglycoside ototoxicity is crucial for prevention.

Purpose of the Study:

  • To review recent advancements in understanding how aminoglycoside antibiotics interact with sensory hair cells.
  • To explore the cellular pathways involved in aminoglycoside-induced hair cell damage.

Main Methods:

  • Review of current scientific literature on aminoglycoside ototoxicity.
  • Analysis of studies on mechanotransduction channels and signaling pathways.
  • Investigation of heat shock protein expression and mitochondrial function in hair cells.

Main Results:

  • Aminoglycosides enter hair cells via mechanotransduction channels, initiating a cell death cascade.
  • Early heat shock protein expression can confer protection against aminoglycoside damage.
  • Signaling from supporting cells may exacerbate hair cell death.
  • Human deafness mutations provide insights into the role of mitochondria in ototoxicity.

Conclusions:

  • Cellular mechanisms of aminoglycoside ototoxicity are under active investigation.
  • New animal models show promise for future research.
  • Effective clinical strategies for preventing aminoglycoside-induced hearing loss are still lacking.

More Related Videos

Dissection of Adult Mouse Utricle and Adenovirus-mediated Supporting-cell Infection11:13

Dissection of Adult Mouse Utricle and Adenovirus-mediated Supporting-cell Infection

Published on: March 28, 2012

The Mouse Round-window Approach for Ototoxic Agent Delivery: A Rapid and Reliable Technique for Inducing Cochlear Cell Degeneration12:21

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

Published on: November 26, 2015

Related Concept Videos

Inhibitors of Bacterial Protein Synthesis01:25

Inhibitors of Bacterial Protein Synthesis

Aminoglycosides constitute a highly potent class of bactericidal antibiotics that exert their antimicrobial effects by targeting the bacterial ribosome, specifically disrupting protein synthesis. These polycationic molecules consist of amino-modified sugars linked via glycosidic bonds to an aminocyclitol core such as 2-deoxystreptamine or streptamine. Their strong positive charges facilitate tight binding to the negatively charged phosphate backbone of ribosomal RNA (rRNA), primarily at the 16S...
Estimation of k and VD of Aminoglycosides01:20

Estimation of k and VD of Aminoglycosides

Aminoglycosides are a class of antibiotics used to treat various bacterial infections. Clinicians must determine the elimination rate constant (k) and volume of distribution (VD) to optimize therapeutic efficacy and minimize toxicity. The k value represents the rate at which the drug is removed from the body, and the VD reflects the degree to which the drug distributes into body tissues. Accurately estimating these parameters allows healthcare professionals to tailor drug dosing to individual...
Antifungal Agents01:15

Antifungal Agents

Amphotericin B is a broad-spectrum antifungal agent that exploits structural differences between fungal and mammalian cell membranes. Its amphipathic structure—featuring a hydrophobic polyene-lactone ring and a hydrophilic region containing mycosamine and carboxylic acid groups—enables selective binding to ergosterol, a sterol predominantly found in fungal plasma membranes. This selective interaction underlies the drug’s antifungal activity, although weak binding to cholesterol contributes to...
Cellular Injury I: Introduction01:00

Cellular Injury I: Introduction

Cellular injury occurs when a cell cannot maintain homeostasis or adapt to stressors such as hypoxia, toxins, or trauma. Depending on severity and duration, injury may be reversible, allowing recovery, or irreversible, leading to cell death.General Mechanisms of Cell InjuryAlthough causes vary, most cellular injuries arise from a few key mechanisms that disrupt essential functions and often amplify one another. Cell survival depends on the extent and balance of these disturbances.ATP depletion...
Drug Elimination by Renal Route: Tubular Secretion01:15

Drug Elimination by Renal Route: Tubular Secretion

Once the process of glomerular filtration is completed, blood carrying unfiltered drug molecules traverses through efferent arterioles and makes its way into the peritubular capillaries in the proximal tubule. A variety of carriers play a pivotal role in actively secreting drugs from these peritubular capillaries into the tubular fluid. The organic anion transporter transfers acidic drugs, against an electrochemical gradient, from the peritubular capillaries into the renal tubule cells and...
ATP Synthase: Mechanism01:48

ATP Synthase: Mechanism

In animals, the mitochondrial F1F0 ATP synthase is the key protein that synthesizes ATP molecules through a complex catalytic mechanism. While the nuclear genome encodes the majority of ATP synthase subunits, the mitochondrial genome encodes some of the enzyme's most critical components. The formation of this multi-subunit enzyme is a complex multi-step process regulated at the level of transcription, translation, and assembly. Defects in one or more of these steps can result in decreased ATP...