Temporal and spatial distribution of gentamicin in the peripheral vestibular system after transtympanic administration in guinea pigs

Ru Zhang, Yi Bo Zhang, Chun Fu Dai, Peter Steyger

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Background and objective: Transtympanic administration of gentamicin is effective for treating patients with intractable vertigo. This study explored the spatial and temporal distribution of gentamicin in vestibular end-organs after transtympanic administration. Methods: Thirty guinea pigs were transtympanically injected with gentamicin conjugated to Texas Red (GTTR) and their vestibular end-organs examined after various survival periods. Another 9 guinea pigs received GTTR at different doses. Nine animals received Texas Red only and served as controls. We used confocal microscopy to determine the cellular distribution of GTTR in semicircular canal cristae, as well as the utricular and saccular maculae. Results: The most intense GTTR labeling was present in the saccule compared to other vestibular end-organs. GTTR fluorescence was detected predominantly in type I hair cells, type II hair cells and transitional cells after a single transtympanic dose of GTTR (0.1 mg/ml, 0.05 ml), while only weak fluorescence was observed in non-sensory cells such as supporting cells, dark cells and lumenal epithelial cells. Transitional cells displayed intense GTTR fluorescence in the supra-nuclear regions 24 h after transtympanic injection that was retained for at least 4 weeks. A decreasing spatial gradient of GTTR fluorescence was observed sensory epithelial regions containing central type I to peripheral type I and then type II hair cells in the crista ampullaris, and from striolar to extra-striolar hair cells within the vestibular macula. GTTR fluorescence extended from being restricted to the apical cytoplasm at lower doses to the entire cell body of type I hair cells with increasing dose. GTTR fluorescence reached peak intensities for individual regions of interest within the cristae and maculae between 3 and 7 days after transtympanic injection. Conclusion: The saccular uptake of GTTR is greater than other vestibular end-organs after transtympanic injection in the semicircular canals.

Original languageEnglish (US)
Pages (from-to)49-59
Number of pages11
JournalHearing Research
Volume298
DOIs
StatePublished - Apr 2013

Fingerprint

Gentamicins
Guinea Pigs
Fluorescence
Semicircular Canals
Intratympanic Injection
Injections
Texas red
Semicircular Ducts
Vestibular Hair Cells
Saccule and Utricle
Somatotypes
Vertigo
Confocal Microscopy
Cytoplasm
Epithelial Cells

ASJC Scopus subject areas

  • Sensory Systems

Cite this

Temporal and spatial distribution of gentamicin in the peripheral vestibular system after transtympanic administration in guinea pigs. / Zhang, Ru; Zhang, Yi Bo; Dai, Chun Fu; Steyger, Peter.

In: Hearing Research, Vol. 298, 04.2013, p. 49-59.

Research output: Contribution to journalArticle

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