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We report our findings in the guinea pig involving dopamine in postsynaptic regulation of the activity of glutamatergic inner hair cells (IHCs) and in protection of primary auditory neurons during transient ischemia. Seven days after intracochlear perfusion of 6-hydroxydopamine, no immunoreactivity to tyrosine hydroxylase (TH) was demonstrable within the organ of Corti. TH and aromatic amino acid decarboxylase were immunolocalized at an ultrastructural level within lateral olivocochlear varicosities synapsing with radial auditory dendrites postsynaptic to the IHCs. The D2 agonist piribedil induced a dose-dependent decrease in the amplitude of the compound action potential of the auditory nerve. Piribedil also prevented appearance of ischemia-induced swelling of the radial dendrites.
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