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Related Experiment Videos

Round window membrane permeability. An in vitro model.

L A Lundman1, L Holmquist, D Bagger-Sjöbäck

  • 1Department of Otorhinolaryngology, Karolinska Sjukhuset, Stockholm, Sweden.

Acta Oto-Laryngologica
|November 1, 1987
PubMed
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This study developed an in vitro model to measure round window membrane permeability. The model accurately assesses how substances pass into the inner ear, crucial for understanding ototoxicity in ear infections.

Area of Science:

  • Otolaryngology
  • Inner Ear Physiology
  • Drug Delivery

Background:

  • The round window membrane (RWM) is a key pathway for ototoxic substances entering the inner ear.
  • Sensorineural hearing loss is a concern in otitis media, potentially linked to RWM permeability.
  • Understanding RWM transport is vital for inner ear health and therapeutic strategies.

Purpose of the Study:

  • To evaluate the accuracy and reliability of a novel in vitro model for RWM permeability.
  • To quantify the passage rates of various molecules across the RWM.
  • To establish a controlled method for studying RWM transport relevant to ototoxicity.

Main Methods:

  • Resection of the mongolian gerbil RWM with its bony niche.
  • Mounting the RWM preparation between two chambers simulating middle and inner ear environments.

Related Experiment Videos

  • Measuring the passage of low-density lipoprotein (2,300 kD), high-density lipoprotein (115–350 kD), and horseradish peroxidase.

    • Main Results:

    • No passage of low-density lipoprotein (2,300 kD) through the RWM within 3 hours.
    • Minimal passage of high-density lipoprotein (115–350 kD) observed.
    • Passage rate estimation for horseradish peroxidase, a known RWM-permeable substance.

    Conclusions:

    • The developed in vitro model provides a reliable platform for controlled RWM permeability studies.
    • This model can accurately determine passage rates of different substances under defined conditions.
    • Findings contribute to understanding ototoxic substance entry into the inner ear and inform clinical management of ear conditions.