Re-expression of NR2B-containing NMDA receptors in vitro by suppression of neuronal activity.
N-methyl-D-aspartate receptors (NMDARs) are known to play critical roles in the development of the nervous system, and their expression is regulated in an activity-dependent fashion during development. However, the regulation of NMDAR expression after circuit formation is less well understood. To examine this, we performed patch-clamp recordings from chick cerebral neurons in an activity-controlled culture. Analysis of NMDAR channels from neurons before synapse formation showed that there are two components in channel open kinetics. The major slow component is clearly blocked by ifenprodil, a specific inhibitor of NR2B-containing NMDARs. In contrast, slow component of NMDAR channel opening from neurons after synapse formation became minor and ifenprodil had little effect on the NMDAR channel openings. Furthermore, this change is reversibly regulated by neuronal activity, in that suppression induces the re-expression of NR2B-containing NMDARs, even after circuit formation.
Kiyosue
Kazuyuki
K
Special Division for Human Life Technology, National Institute of Advanced Industrial Science and Technology (AIST), 1-8-31 Midorioka, Ikeda, Osaka 563-8577, Japan.
Hiyama
Takeshi Y
TY
Nakayama
Kimiko
K
Kasai
Michiki
M
Taguchi
Takahisa
T
D000200:Action Potentials / Q000187:drug effects / Q000502:physiology*; D000818:Animals; D002454:Cell Differentiation / Q000187:drug effects / Q000502:physiology; D002478:Cells, Cultured; D002540:Cerebral Cortex / Q000166:cytology / Q000187:drug effects / Q000254:growth & development; D002642:Chick Embryo; D018691:Excitatory Amino Acid Antagonists / Q000494:pharmacology; D008564:Membrane Potentials / Q000187:drug effects / Q000502:physiology; D009433:Neural Inhibition / Q000187:drug effects / Q000502:physiology*; D009434:Neural Pathways / Q000166:cytology / Q000187:drug effects / Q000254:growth & development; D009474:Neurons / Q000187:drug effects / Q000378:metabolism*; D010880:Piperidines / Q000494:pharmacology; D016194:Receptors, N-Methyl-D-Aspartate / Q000187:drug effects / Q000378:metabolism*; D026941:Sodium Channel Blockers / Q000494:pharmacology; D013569:Synapses / Q000187:drug effects / Q000378:metabolism; D009435:Synaptic Transmission / Q000187:drug effects / Q000502:physiology*; D013779:Tetrodotoxin / Q000494:pharmacology
D018691:Excitatory Amino Acid Antagonists; C121001:NR2B NMDA receptor; D010880:Piperidines; D016194:Receptors, N-Methyl-D-Aspartate; D026941:Sodium Channel Blockers; D013779:Tetrodotoxin; C010739:ifenprodil