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Related Experiment Videos

Hyaluronan content in human inner ear fluids.

U Friberg1, C Erwall, D Bagger-Sjöbäck

  • 1Department of Otolaryngology, University Hospital, Uppsala, Sweden.

Acta Oto-Laryngologica
|July 1, 1989
PubMed
Summary
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Hyaluronan (hyaluronic acid; HA) levels in human endolymphatic sac (ES) endolymph varied significantly, while perilymph HA concentrations were more consistent. These findings suggest HA

Area of Science:

  • Biochemistry
  • Otolaryngology
  • Physiology

Background:

  • Endolymphatic sac (ES) luminal contents contain acid mucopolysaccharides/proteoglycans.
  • Hyaluronan (hyaluronic acid; HA) is a key component of proteoglycans.

Purpose of the Study:

  • To biochemically determine hyaluronan (HA) concentrations in human endolymphatic sac (ES) endolymph and vestibular perilymph.
  • To investigate the potential role of HA in ES function.

Main Methods:

  • Biochemical determination of hyaluronan (HA) using a specific radioassay.
  • Analysis of HA concentrations in human ES endolymph and vestibular perilymph samples.

Main Results:

  • Significant variation in HA concentration was observed in individual ES endolymph samples (mean 2.50 µg/g, range 0.00-10.86).

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  • Perilymph HA concentrations were less variable (mean 0.91 µg/g, range 0.56-1.51).
  • The difference in HA concentration between endolymph and perilymph was not statistically significant (p > 0.05).

    • Conclusions:

    • Hyaluronan's interaction with proteoglycans may form hydrophilic molecules crucial for ES function.
    • These HA-proteoglycan complexes could provide swelling pressure, preventing ES collapse under increased intracranial pressure.