Zinc enhances long-term potentiation through P2X receptor modulation in the hippocampal CA1 region

Authors

  • Ramón A. Lorca,

    1. Laboratorio de Neurociencias, Departamento de Biología, Facultad de Química y Biología, Universidad de Santiago de Chile, Santiago 9170022, Chile
    2. Laboratorio de Nucleótidos, Centro de Regulación Celular y Patología, J.V. Luco, Instituto MIFAB, Departamento de Fisiología, Facultad de Ciencias Biológicas, P. Universidad Católica de Chile, Santiago, Chile
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    • R.A.L. and C.R. contributed equally to this work.

    • Present address: Department of Molecular Physiology and Biophysics, Roy J. and Lucille A. Carver College of Medicine, University of Iowa, Iowa City, IA 52242, USA.

  • Carlos Rozas,

    1. Laboratorio de Neurociencias, Departamento de Biología, Facultad de Química y Biología, Universidad de Santiago de Chile, Santiago 9170022, Chile
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    • R.A.L. and C.R. contributed equally to this work.

  • Sebastian Loyola,

    1. Laboratorio de Neurociencias, Departamento de Biología, Facultad de Química y Biología, Universidad de Santiago de Chile, Santiago 9170022, Chile
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  • Sandra Moreira-Ramos,

    1. Laboratorio de Neurociencias, Departamento de Biología, Facultad de Química y Biología, Universidad de Santiago de Chile, Santiago 9170022, Chile
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  • Marc L. Zeise,

    1. Escuela de Psicología, Universidad de Santiago de Chile, Santiago, Chile
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  • Alfredo Kirkwood,

    1. Mind/Brain Institute and Department of Neurosciences, Johns Hopkins University, Baltimore, MD, USA
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  • J. Pablo Huidobro-Toro,

    1. Laboratorio de Nucleótidos, Centro de Regulación Celular y Patología, J.V. Luco, Instituto MIFAB, Departamento de Fisiología, Facultad de Ciencias Biológicas, P. Universidad Católica de Chile, Santiago, Chile
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  • Bernardo Morales

    1. Laboratorio de Neurociencias, Departamento de Biología, Facultad de Química y Biología, Universidad de Santiago de Chile, Santiago 9170022, Chile
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Dr B. Morales, as above.
E-mail: bernardo.morales@usach.cl

Abstract

Zn2+ is an essential ion that is stored in and co-released from glutamatergic synapses and it modulates neurotransmitter receptors involved in long-term potentiation (LTP). However, the mechanism(s) underlying Zn2+-induced modulation of LTP remain(s) unclear. As the purinergic P2X receptors are relevant targets for Zn2+ action, we have studied their role in LTP modulation by Zn2+ in the CA1 region of rat hippocampal slices. Induction of LTP in the presence of Zn2+ revealed a biphasic effect – 5–50 μm enhanced LTP induction, whereas 100–300 μm Zn2+ inhibited LTP. The involvement of a purinergic mechanism is supported by the fact that application of the P2X receptor antagonists 2′,3′-O-(2,4,6-trinitrophenyl) ATP (TNP-ATP) and periodate-oxidized ATP fully abolished the facilitatory effect of Zn2+. Notably, application of the P2X7 receptor-specific antagonist Brilliant Blue G did not modify the Zn2+-dependent facilitation of LTP. Exogenous ATP also produced a biphasic effect – 0.1–1 μm ATP facilitated LTP, whereas 5–10 μm inhibited LTP. The facilitatory effect of ATP was abolished by the application of TNP-ATP and was modified in the presence of 5 μm Zn2+, suggesting that P2X receptors are involved in LTP induction and that Zn2+ leads to an increase in the affinity of P2X receptors for ATP. The latter confirms our previous results from heterologous expression systems. Collectively, our results indicate that Zn2+ at low concentrations enhances LTP by modulating P2X receptors. Although it is not yet clear which purinergic receptor subtype(s) is responsible for these effects on LTP, the data presented here suggest that P2X4 but not P2X7 is involved.

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