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Effects of various vanadium compounds on cochlear potentials.

T Nakano¹, T Morimitsu

¹Kagoshima Immaculate Heart College, Japan.

Acta Oto-Laryngologica. Supplementum

|January 1, 1988

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Pentavalent vanadate compounds primarily inhibit the endocochlear potential (EP) and secondarily affect cochlear microphonic potential (CM) in guinea pigs, impacting hearing function.

Area of Science:

Ototoxicology
Neuroscience
Biochemistry

Background:

The endocochlear potential (EP) and cochlear microphonic potential (CM) are crucial for auditory function.
Vanadium compounds are known to have various biological effects, but their specific impact on cochlear potentials requires elucidation.

Purpose of the Study:

To investigate the effects of different vanadium compounds on EP and CM in the guinea pig cochlea.
To determine the primary site of action and potential mechanisms of vanadate-induced auditory impairment.

Main Methods:

Perfusion of the guinea pig perilymphatic space with 1 mM solutions of various vanadium compounds (sodium vanadate, ammonium vanadate, potassium vanadate, vanadium oxysulfate, vanadium acetylacetonate, vanadium trichloride).
Monitoring of EP, CM, and negative EP changes in response to perfusion.

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Main Results:

Pentavalent vanadates (sodium, ammonium, potassium) caused an initial EP overshoot followed by a gradual decrease.
These vanadates also led to a gradual decrease in CM.
Other tested vanadium compounds did not significantly affect EP or CM.
Negative EP remained unchanged across all tested compounds.

Conclusions:

Vanadate compounds primarily inhibit the EP, with a secondary inhibitory effect on CM.
The stria vascularis is implicated as a potential target for vanadate action.
Vanadates may play a role in the pathophysiology of acute hearing loss.