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. 1990 Oct;87(20):8150–8154. doi: 10.1073/pnas.87.20.8150

Thyrotropin-releasing-hormone (TRH) and its physiological metabolite TRH-OH inhibit Na+ channel activity in mammalian septal neurons.

J López-Barneo 1, A Castellano 1, J Toledo-Aral 1
PMCID: PMC54910  PMID: 2172974

Abstract

The interaction of thyrotropin-releasing hormone (TRH) and its physiological metabolite TRH-OH with Na+ channels was studied in enzymatically dissociated guinea pig septal neurons by using the whole-cell variant of the patch-clamp technique. In about 60% of the cells tested, the neuropeptides at concentrations between 0.01 and 2.5 microM produced a dose-dependent reversible attenuation of Na+ currents. With 2 microM TRH-OH, peak Na+ current amplitude was reduced by 20-50% (27 +/- 8%, mean +/- SD; n = 16), whereas at the same concentration TRH was approximately half as effective as TRH-OH. In the presence of the tripeptides, the voltage-dependent parameter of the Na+ current were unaltered. TRH-induced reduction of Na+ current amplitude was transient and recovered almost completely during maintained exposure to the peptides. In addition, the response to either TRH-OH or TRH decreased with repeated treatment. Our results demonstrate that neuronal Na+ channels can be modulated by naturally occurring neuropeptides.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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