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The Journal of Neuroscience, March 1, 1999, 19(5):1636-1646

Low Resting Potential and Postnatal Upregulation of NMDA Receptors May Cause Cajal-Retzius Cell Death

Jean-Marc Mienville and Christine Pesold

The Psychiatric Institute, Department of Psychiatry, The University of Illinois at Chicago, Chicago, Illinois 60612

Using in situ patch-clamp techniques in rat telencephalic slices, we have followed resting potential (RP) properties and the functional expression of NMDA receptors in neocortical Cajal-Retzius (CR) cells from embryonic day 18 to postnatal day 13, the time around which these cells normally disappear. We find that throughout their lives CR cells have a relatively depolarized RP (approximately -50 mV), which can be made more hyperpolarized (approximately -70 mV) by stimulation of the Na/K pump with intracellular ATP. The NMDA receptors of CR cells are subjected to intense postnatal upregulation, but their similar properties (EC50, Hill number, sensitivity to antagonists, conductance, and kinetics) throughout development suggest that their subunit composition remains relatively homogeneous. The low RP of CR cells is within a range that allows for the relief of NMDA channels from Mg2+ blockade. Our findings are consistent with the hypothesis that CR cells may degenerate and die subsequent to uncontrolled overload of intracellular Ca2+ via NMDA receptor activation by ambient glutamate. In support of this hypothesis we have obtained evidence showing the protection of CR cells via in vivo blockade of NMDA receptors with dizocilpine.

Key words: Cajal-Retzius cell; cell death; NMDA receptor; resting potential; patch clamp; brain slice

Copyright © 1999 Society for Neuroscience  0270-6474/99/1951636-11$05.00/0


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