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Interaction Between Metals and Chelating Agents Affects Glutamate Binding on Brain Synaptic Membranes

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Abstract

The present study investigates the possible effects of Hg2+, Pb2+, and Cd2+ on [3H]-glutamate binding. To better understand the role of the thiol-disulfide status on the toxicity of such metals toward glutamatergic neurotransmission, we used three thiol chelating agents, 2,3-dimercaptopropanol (BAL), 2,3-dimercaptopropane 1-sulfonate (DMPS), and meso-2,3-dimercaptosuccinic acid (DMSA). Dithiotreitol (DTT) was tested for its ability to prevent metals-induced inhibition on [3H]-glutamate binding. Hg2+, Pb2+, and Cd2+ showed a concentration-dependent inhibition on [3H]-glutamate binding, and mercury was the most effective inhibitor. BAL did not prevent [3H]-glutamate binding inhibition by Hg2+, Cd2+, and Pb2+. However, DMPS and DMSA prevented the inhibition caused by Cd2+ and Pb2+, but not by Hg2+. DTT did not prevent the inhibition on [3H]-glutamate binding caused by 10 μM Hg2+. In contrast, it was able to partially prevent [3H]-glutamate binding inhibition caused by 40 μM Pb2+ and Cd2+. These results demonstrated that the heavy metals present an inhibitory effect on [3H]-glutamate binding. In addition, BAL was less effective to protect [3H]-glutamate binding inhibition caused by these metals than other chelating agents studied.

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Authors and Affiliations

  1. Departamento de Bioquimica, ICBS, Universidade Federal do, Rio Grande do Sul, RS, Brazil

    Félix Antunes Soares, Marcelo Farina, Francielli Weber Santos, Diogo Souza, João Batista Teixeira Rocha & Cristina Wayne Nogueira

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  1. Félix Antunes Soares
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  2. Marcelo Farina
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  3. Francielli Weber Santos
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  6. Cristina Wayne Nogueira
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Correspondence to Cristina Wayne Nogueira.

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Soares, F.A., Farina, M., Santos, F.W. et al. Interaction Between Metals and Chelating Agents Affects Glutamate Binding on Brain Synaptic Membranes. Neurochem Res 28, 1859–1865 (2003). https://doi.org/10.1023/A:1026175825871

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