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Counteraction by repetitive daily exposure to static magnetism against sustained blockade of N‐methyl‐D‐aspartate receptor channels in cultured rat hippocampal neurons
Author(s) -
Hirai Takao,
Taniura Hideo,
Goto Yasuaki,
Tamaki Keisuke,
Oikawa Hirotaka,
Kambe Yuki,
Ogura Masato,
Ohno Yu,
Takarada Takeshi,
Yoneda Yukio
Publication year - 2005
Publication title -
journal of neuroscience research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.72
H-Index - 160
eISSN - 1097-4547
pISSN - 0360-4012
DOI - 10.1002/jnr.20497
Subject(s) - nmda receptor , neurotoxicity , hippocampal formation , dizocilpine , neurotrophic factors , receptor , neun , chemistry , biology , neuroscience , endocrinology , medicine , microbiology and biotechnology , biochemistry , toxicity , immunohistochemistry
In rat hippocampal neurons cultured with the antagonist for N‐methyl‐D‐aspartate (NMDA) receptors dizocilpine (MK‐801) for 8 days in vitro (DIV), a significant decrease was seen in the expression of microtubule‐associated protein‐2 (MAP‐2) as well as mRNA for both brain‐derived neurotrophic factor (BDNF) and growth‐associated protein‐43 (GAP‐43), in addition to decreased viability. MK‐801 not only decreased the expression of the NR1 subunit of NMDA receptors but also increased NR2A expression, without affecting NR2B expression. Repetitive daily exposure to static magnetic fields at 100 mT for 15 min led to a decrease in the expression of MAP‐2, without significantly affecting cell viability or the expression of neuronal nuclei (NeuN) and GAP‐43. However, the repetitive magnetism prevented decreases in both BDNF mRNA and MAP‐2 and additionally increased the expression of NR2A subunit, without altering NR1 expression in neurons cultured in the presence of MK‐801. Repetitive magnetism was also effective in preventing the decrease by MK‐801 in the ability of NMDA to increase intracellular free Ca 2+ ions, without affecting the decrease in the maximal response. These results suggest that repetitive magnetism may at least in part counteract the neurotoxicity of MK‐801 through modulation of the expression of particular NMDA receptor subunits in cultured rat hippocampal neurons. © 2005 Wiley‐Liss, Inc.