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Related Experiment Videos

Round window membrane permeability. An in vitro model.

L Lundman1, D Bagger-Sjöbäck, L Holmquist

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

Acta Oto-Laryngologica. Supplementum
|January 1, 1989
PubMed
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This study developed an in vitro model to measure round window membrane permeability. Larger molecules like high-density lipoprotein did not pass, while horse-radish peroxidase showed measurable passage, enabling controlled substance transport studies.

Area of Science:

  • Otic science
  • Membrane transport physiology

Background:

  • The round window membrane (RWM) is a critical barrier in the inner ear.
  • Understanding RWM permeability is vital for drug delivery and understanding inner ear physiology.

Purpose of the Study:

  • To establish a novel in vitro model for quantifying substance passage across the mongolian gerbil's round window membrane.
  • To assess the permeability of the RWM to molecules of different sizes.

Main Methods:

  • Dissection of the round window membrane and its bony niche from mongolian gerbils.
  • Mounting the preparation in a two-chamber system simulating middle ear and perilymphatic spaces.
  • In vitro testing of high-density lipoprotein and horse-radish peroxidase passage.

Main Results:

Related Experiment Videos

  • High-density lipoprotein (115-350 kD) showed no passage through the RWM within 3 hours.
  • Horse-radish peroxidase (48 kD) permeated the RWM at a mean rate of 6 µg/h at a concentration of 10 g/l.
  • The in vitro model demonstrated minimal leakage between chambers.

Conclusions:

  • The developed in vitro model effectively measures RWM permeability under controlled conditions.
  • The RWM acts as a significant barrier to larger molecules but allows passage of smaller proteins like HRP.
  • This model is suitable for future studies on drug delivery and transport mechanisms across the RWM.