Acute effect of corticosterone on N-methyl-D-aspartate receptor-mediated Ca2+ elevation in mouse hippocampal slices.
We examined the rapid effects of corticosterone (CORT) on N-methyl-D-aspartate (NMDA) receptor-mediated Ca2+ signals in adult mouse hippocampal slices by using Ca2+ imaging technique. Application of NMDA caused a transient elevation of intracellular Ca2+ concentration followed by a decay to a plateau within 150s. The 30min preincubation of CORT induced a significant decrease of the peak amplitude of NMDA-induced Ca2+ elevation in the CA1 region. The rapid effect of CORT was induced at a stress-induced level (0.4-10microM). Because the membrane non-permeable bovine serum albumin-conjugated CORT also induced a similar rapid effect, the rapid effect of CORT might be induced via putative surface CORT receptors. In contrast, CORT induced no significant effects on NMDA-induced Ca2+ elevation in the dentate gyrus. In the CA3 region, CORT effects were not evaluated, because the marked elevation of NMDA-induced Ca2+ signals was not observed there.
Sato
Satoru
S
Department of Physics and Applied Physics, College of Humanities and Sciences, Nihon University, 3-25-40 Sakurajosui, Setagaya-ku, Tokyo 156-8550, Japan.
Osanai
Hiromi
H
Monma
Toshihiro
T
Harada
Tokiko
T
Hirano
Ayumi
A
Saito
Minoru
M
Kawato
Suguru
S
D000818:Animals; D002118:Calcium / Q000378:metabolism*; D020013:Calcium Signaling / Q000187:drug effects*; D003345:Corticosterone / Q000494:pharmacology*; D006624:Hippocampus / Q000187:drug effects* / Q000378:metabolism*; D066298:In Vitro Techniques; D008297:Male; D051379:Mice; D016202:N-Methylaspartate / Q000494:pharmacology; D016194:Receptors, N-Methyl-D-Aspartate / Q000378:metabolism*
D016194:Receptors, N-Methyl-D-Aspartate; D016202:N-Methylaspartate; D002118:Calcium; D003345:Corticosterone