Effects of endolymphatic and perilymphatic application of salicylate in the pigeon. I: Single fiber activity and cochlear potentials

Wafaa E. Shehata-Dieler, Claus Peter Richter, Ralf Dieler, Rainer Klinke*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

The effects of salicylate on the mammalian cochlea function are well documented. However, there is a lack of reports on salicylate effects on the avian auditory periphery and it might well be that salicylate is not ototoxic at all in submammalian vertebrates. We therefore recorded single fiber activities, compound action potential (CAP) and endocochlear potential (EP) during application of salicylate (calculated final concentration of about 2-18 mmol/l) into the scala media of pigeons. We furthermore recorded CAP and EP during perilymphatic perfusion of salicylate (2-20 mmol/l). Salicylate applied into the scala media led to an elevation of tip threshold in single fibers ranging from 5 to 35 dB. The characteristic frequencies of the fibers were not changed. This effect on auditory nerve fibers was reflected in an elevation of CAP thresholds. The mean spontaneous discharge rate was either slightly increased or remained unchanged in the majority of fibers. Perilymphatic salicylate perfusion also led to an elevation of CAP thresholds that was reversible following subsequent perfusion with artificial perilymph. The EP remained unchanged in both application modes. The effects of salicylate were dose dependent and more pronounced in the mid-to high-frequency range. These results are consistent with an action of salicylate on the process (electrical or mechanical, or both) responsible for the sensitivty and frequency selectivity in the avian peripheral hearing organ.

Original languageEnglish (US)
Pages (from-to)77-84
Number of pages8
JournalHearing research
Volume74
Issue number1-2
DOIs
StatePublished - Apr 1994

Keywords

  • Basilar papilla
  • Bird
  • Cochlear potentials
  • Pigeon
  • Salicylate

ASJC Scopus subject areas

  • Sensory Systems

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