Effects of inorganic mercury and methylmercury on the ionic currents of cultured rat hippocampal neurons

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Abstract

1. The effects of inorganic Hg2+ and methylmercuric chloride on the ionic currents of cultured hippocampal neurons were studied and compared. We examined the effects of acute exposure to the two forms of mercury on the properties of voltage-activated Ca2+ and Na+ currents and N-methyl-D- aspartate (NMDA)-induced currents. 2. High-voltage activated Ca2+ currents (L type) were inhibited by both compounds at low micromolar concentrations in an irreversible manner. Mercuric chloride was five times as potent as methylmercury in blocking L-channels. 3. Both compounds caused a transient increase in the low-voltage activated (T-type) currents at low concentrations (1 μM) but blocked at higher concentrations and with longer periods of time. 4. Inorganic mercury blockade was partially use dependent, but that by methylmercury was not. There was no effect of exposure of either form of mercury on the I-V characteristics of Ca2+ currents. 5. Na+- and NMDA- induced currents were essentially unaffected by either mercury compound, showing only a delayed nonspecific effect at a time of overall damage of the membrane.

Original languageEnglish
Pages (from-to)273-288
Number of pages16
JournalCellular and Molecular Neurobiology
Volume17
Issue number3
DOIs
Publication statusPublished - 1997

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Mercury
N-Methylaspartate
Neurons
Mercury Compounds
Mercuric Chloride
Membranes

Keywords

  • Calcium currents
  • Mercury
  • Methylmercury
  • N-methyl-D-aspartate currents
  • T currents

ASJC Scopus subject areas

  • Cellular and Molecular Neuroscience
  • Cell Biology

Cite this

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title = "Effects of inorganic mercury and methylmercury on the ionic currents of cultured rat hippocampal neurons",
abstract = "1. The effects of inorganic Hg2+ and methylmercuric chloride on the ionic currents of cultured hippocampal neurons were studied and compared. We examined the effects of acute exposure to the two forms of mercury on the properties of voltage-activated Ca2+ and Na+ currents and N-methyl-D- aspartate (NMDA)-induced currents. 2. High-voltage activated Ca2+ currents (L type) were inhibited by both compounds at low micromolar concentrations in an irreversible manner. Mercuric chloride was five times as potent as methylmercury in blocking L-channels. 3. Both compounds caused a transient increase in the low-voltage activated (T-type) currents at low concentrations (1 μM) but blocked at higher concentrations and with longer periods of time. 4. Inorganic mercury blockade was partially use dependent, but that by methylmercury was not. There was no effect of exposure of either form of mercury on the I-V characteristics of Ca2+ currents. 5. Na+- and NMDA- induced currents were essentially unaffected by either mercury compound, showing only a delayed nonspecific effect at a time of overall damage of the membrane.",
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AU - Szűcs, A.

PY - 1997

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N2 - 1. The effects of inorganic Hg2+ and methylmercuric chloride on the ionic currents of cultured hippocampal neurons were studied and compared. We examined the effects of acute exposure to the two forms of mercury on the properties of voltage-activated Ca2+ and Na+ currents and N-methyl-D- aspartate (NMDA)-induced currents. 2. High-voltage activated Ca2+ currents (L type) were inhibited by both compounds at low micromolar concentrations in an irreversible manner. Mercuric chloride was five times as potent as methylmercury in blocking L-channels. 3. Both compounds caused a transient increase in the low-voltage activated (T-type) currents at low concentrations (1 μM) but blocked at higher concentrations and with longer periods of time. 4. Inorganic mercury blockade was partially use dependent, but that by methylmercury was not. There was no effect of exposure of either form of mercury on the I-V characteristics of Ca2+ currents. 5. Na+- and NMDA- induced currents were essentially unaffected by either mercury compound, showing only a delayed nonspecific effect at a time of overall damage of the membrane.

AB - 1. The effects of inorganic Hg2+ and methylmercuric chloride on the ionic currents of cultured hippocampal neurons were studied and compared. We examined the effects of acute exposure to the two forms of mercury on the properties of voltage-activated Ca2+ and Na+ currents and N-methyl-D- aspartate (NMDA)-induced currents. 2. High-voltage activated Ca2+ currents (L type) were inhibited by both compounds at low micromolar concentrations in an irreversible manner. Mercuric chloride was five times as potent as methylmercury in blocking L-channels. 3. Both compounds caused a transient increase in the low-voltage activated (T-type) currents at low concentrations (1 μM) but blocked at higher concentrations and with longer periods of time. 4. Inorganic mercury blockade was partially use dependent, but that by methylmercury was not. There was no effect of exposure of either form of mercury on the I-V characteristics of Ca2+ currents. 5. Na+- and NMDA- induced currents were essentially unaffected by either mercury compound, showing only a delayed nonspecific effect at a time of overall damage of the membrane.

KW - Calcium currents

KW - Mercury

KW - Methylmercury

KW - N-methyl-D-aspartate currents

KW - T currents

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