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Effects of hyperosmolar substances on the endolymphatic sac
H Rask-Andersen1, U Friberg, C Erwall
1Department of Otolaryngology, Akademiska Sjakhuset, Uppsala, Sweden.
Acta Oto-Laryngologica. Supplementum
|January 1, 1989
Summary
Glycerol administration temporarily alters the murine endolymphatic sac (ES) volume and cellular composition. The ES recovers within 8 hours, suggesting a role in regulating endolymph pressure.
Area of Science:
- Otolaryngology
- Physiology
- Cell Biology
Background:
- The endolymphatic sac (ES) plays a crucial role in maintaining inner ear fluid balance.
- Understanding the dynamic response of the ES to osmotic challenges is vital for inner ear research.
Purpose of the Study:
- To investigate the morphological and cellular changes in the murine endolymphatic sac (ES) following intravenous glycerol administration.
- To elucidate the temporal dynamics of ES volume and epithelial cell populations after osmotic stress.
Main Methods:
- Murine models were administered intravenous glycerol.
- Endolymphatic sacs were analyzed at various time points (15 min to 8 hours) post-injection.
- Morphometric analysis and cell population counts (granular cells) were performed.
Main Results:
- Intravenous glycerol caused initial ES obliteration, peaking at 15-60 minutes.
- ES volume normalized by 2 hours and subsequently dilated to 160% by 4 hours.
- A significant increase in ES granular cells (15.8% vs. 6.1% in controls) was observed by 2 hours, accompanied by lumen filling.
Conclusions:
- The murine endolymphatic sac exhibits a dynamic response to glycerol-induced osmotic changes.
- Increased granular cell activity suggests a role in managing endolymphatic pressure fluctuations.
- The ES demonstrates adaptive capacity to restore homeostasis following osmotic insult.