Abstract
Taurine is one of the most abundant free amino acids in the central nervous system, where it displays several functions. However, its molecular targets remain unknown. It is well known that taurine can activate GABA-A and strychnine-sensitive glycine receptors, which increases a chloride conductance. In this study, we describe that acute application of taurine induces a dose-dependent inhibition of voltage-dependent calcium channels in chromaffin cells from bovine adrenal medullae. This taurine effect was not explained by the activation of either GABA-A, GABA-B or strychnine-sensitive glycine receptors. Interestingly, glycine mimicked the modulatory action exerted by taurine on calcium channels, although the acute application of glycine did not elicit any ionic current in these cells. Additionally, the modulation of calcium channels exerted by both taurine and glycine was prevented by the intracellular dialysis of GDP-β-S. Thus, the modulation of voltage-dependent calcium channels by taurine seems to be mediated by a metabotropic-like glycinergic receptor coupled to G-protein activation in a membrane delimited pathway.
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Acknowledgments
This study was supported by Instituto de Salud Carlos III (grant PI080227 to J.M.H-G; and grant PI081067 to J.M.S.). E.A. is a fellow of Fundación Teófilo Hernando. We also acknowledge financial support from the CEAL-UAM-Banco de Santander.
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A commentary to this article can be found at doi: 10.1007/s10571-010-9611-z.
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10571_2010_9574_MOESM1_ESM.tif
Supplementary Fig. 1. Inmunofluorescence images showing the localisation of taurine in chromaffin cells. A 1 Inmunostaining with antibodies against taurine in an adrenal gland slice. Note the strong signal detected in the cortical tissue. A 2 Magnification of medullae region. Note the labelling of the nucleus in approximately half of adrenal chromaffin cells. B 1 Immunostaining with antibodies anti-taurine transporter in an adrenal gland slice. Note the strong signal detected in the cortical tissue. B 2 Magnification of medullae region. Note the lack of signal in the totality of adrenal chromaffin cells. Controls without primary antibodies for TAU (C 1 ) and TAUT (C 2 ) show a very faint immunostaining, these photographs were obtained with the same exposure times used in A and B. Scale bars: A 1 , B 1 , C 1 , C 2 : 50 μm; A 2 , B 2 : 25 μm. l (TIFF 1,613 kb)
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Albiñana, E., Sacristán, S., Martín del Río, R. et al. Modulation of Calcium Channels by Taurine Acting Via a Metabotropic-like Glycine Receptor. Cell Mol Neurobiol 30, 1225–1233 (2010). https://doi.org/10.1007/s10571-010-9574-0
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DOI: https://doi.org/10.1007/s10571-010-9574-0