Developmental changes in the voltage-dependence of neocortical NMDA responses.
A change in the response of neocortical neurons to N-methyl-D-aspartate (NMDA) was observed during the first 2 weeks of postnatal development. When NMDA was bath applied, the membrane current-voltage relationship recorded in neurons from postnatal day (PN) 3-5 rats displayed a region of decreased inward current at hyperpolarized membrane potentials. By PN 9-14, the net inward current at hyperpolarized potentials was significantly less than that recorded in PN 3-5 neurons. These results indicate that a developmental increase in the voltage-dependence of NMDA responses exists, which may be due to changes in magnesium sensitivity of the NMDA receptor.
Neurobiology Research Center, University of Alabama at Birmingham 35294.
E C
EC
Burgard
J J
JJ
Hablitz
D000818:Animals; D002540:Cerebral Cortex / Q000166:cytology / Q000254:growth & development* / Q000502:physiology*; D004594:Electrophysiology; D066298:In Vitro Techniques; D008274:Magnesium / Q000494:pharmacology; D008564:Membrane Potentials / Q000187:drug effects / Q000502:physiology; D009474:Neurons / Q000187:drug effects / Q000502:physiology; D018408:Patch-Clamp Techniques; D051381:Rats; D016194:Receptors, N-Methyl-D-Aspartate / Q000187:drug effects / Q000502:physiology*
D016194:Receptors, N-Methyl-D-Aspartate; D008274:Magnesium