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A Newly Identified Role of the Tectorial Membrane in Aminoglycoside Ototoxicity

George W S Burwood1, Pierre Hakizimana2, Teresa Wilson1

  • 1Oregon Hearing Research Center, Department of Otolaryngology - Head & Neck Surgery, Oregon Health & Science University, 3181 SW Sam Jackson Park Rd, Portland, OR, 97239, USA.

Biorxiv : the Preprint Server for Biology
|May 18, 2026
PubMed

Insights

Aminoglycoside antibiotics can cause hearing loss. Our study reveals the inner ear's tectorial membrane sequesters these drugs, suggesting a new target to prevent ototoxicity.

Area of Science:

  • Inner ear biology
  • Ototoxicity mechanisms
  • Drug safety

Background:

  • Aminoglycoside (AG) antibiotics are crucial but limited by ototoxicity.
  • The tectorial membrane (TM) in the inner ear sequesters calcium ions.
  • AG ototoxicity is a significant clinical concern due to rising antibiotic resistance.

Purpose of the Study:

  • To investigate the tectorial membrane's role in aminoglycoside ototoxicity.
  • To determine if the TM sequesters aminoglycosides.
  • To assess the impact of TM genetic ablation on AG-induced ototoxicity.

Main Methods:

  • Genetic ablation of the tectorial membrane in TectaΔENT/ΔENT mice.
  • Administration of AG-furosemide and observation of outer hair cell loss.
  • Spectroscopy measurements of gentamicin-Texas Red (GTTR) in isolated TMs and cochleae.

Main Results:

  • TM-lacking mice showed significantly reduced outer hair cell loss after AG administration.
  • Tectorial membranes were found to sequester gentamicin.
  • Gentamicin sequestration in the TM was negatively correlated with TectaY1870C zygosity.

Conclusions:

  • The tectorial membrane is a novel component in the aminoglycoside ototoxicity pathway.
  • Intact TM structure is necessary for AG sequestration and modulation of ototoxicity.
  • TM sequestration of AGs occurs during systemic therapy, indicating a potential therapeutic target.

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