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- W4387357753 abstract "Abstract Besides its role in the circadian rhythm, the pineal gland hormone melatonin (MLT) also possesses antiepileptogenic, antineoplastic, and cardioprotective properties, among others. The dosages necessary to elicit beneficial effects in these diseases often far surpass physiological concentrations. Although even high doses of MLT are considered to be largely harmless to humans, the possible side effects of pharmacological concentrations are so far not well investigated. In the present study, we report that pharmacological doses of MLT (3 mM) strongly altered the electrophysiological characteristics of cultured primary mouse cerebellar granule cells (CGCs). Using whole‐cell patch clamp and ratiometric Ca 2+ imaging, we observed that pharmacological concentrations of MLT inhibited several types of voltage‐gated Na + , K + , and Ca 2+ channels in CGCs independently of known MLT‐receptors, altering the character and pattern of elicited action potentials (APs) significantly, quickly and reversibly. Specifically, MLT reduced AP frequency, afterhyperpolarization, and rheobase, whereas AP amplitude and threshold potential remained unchanged. The altered biophysical profile of the cells could constitute a possible mechanism underlying the proposed beneficial effects of MLT in brain‐related disorders, such as epilepsy. On the other hand, it suggests potential adverse effects of pharmacological MLT concentrations on neurons, which should be considered when using MLT as a pharmacological compound." @default.
- W4387357753 created "2023-10-06" @default.
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- W4387357753 date "2023-10-05" @default.
- W4387357753 modified "2023-10-06" @default.
- W4387357753 title "Melatonin alters the excitability of mouse cerebellar granule neurons by inhibiting voltage‐gated sodium, potassium, and calcium channels" @default.
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- W4387357753 doi "https://doi.org/10.1111/jpi.12919" @default.
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