Summary
Exposure of cultured cerebellar neurons to the histamine H1 receptor antagonist terfenadine resulted in neuronal degeneration and death. Terfenadine neurotoxicity was dependent upon concentration and time of exposure. After 2h exposure, 20µM terfenadine reduced the number of surviving neurons by 75%, and as low as 10nM terfenadine induced significant neurotoxicity after 5 days of exposure. Neuronal sensitivity to terfenadine changed with age in culture, and at 25 days in culture neurons appeared to be much less sensitive than at 5 or 9–17 days in culture. Neurotoxicity by terfenadine could not be prevented by high concentrations of histamine (5 mM), but it was significantly delayed by blocking NMDA or non-NMDA glutamate receptors with MK-801 or CNQX respectively, suggesting the involvement of excitatory transmission mediated by glutamate in the neurotoxicity induced by terfenadine in these neurons. We also found that the presence of terfenadine (5,µM) unveiled the potential excitotoxicity of the non-NMDA receptor agonist AMPA (100µM), and reduced the concentration of glutamate necessary to induce excitotoxicity, compared to untreated cultures. These results suggest a role for terfenadine in the modulation of the excitotoxic response mediated in cerebellar neurons through ionotropic glutamate receptors.
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Díaz-Trelles, R., Solana-López, A., Fernández-González, J.R. et al. Terfenadine induces toxicity in cultured cerebellar neurons: A role for glutamate receptors. Amino Acids 16, 59–70 (1999). https://doi.org/10.1007/BF01318885
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DOI: https://doi.org/10.1007/BF01318885