Membrane potential of CA3 hippocampal pyramidal cells during postnatal development. - Inserm - Institut national de la santé et de la recherche médicale Access content directly
Journal Articles Journal of Neurophysiology Year : 2003

Membrane potential of CA3 hippocampal pyramidal cells during postnatal development.

Abstract

A depolarized resting membrane potential has long been considered to be a universal feature of immature neurons. Despite the physiological importance, the underlying mechanisms of this developmental phenomenon are poorly understood. Using perforated-patch, whole cell, and cell-attached recordings, we measured the membrane potential in CA3 pyramidal cells in hippocampal slices from postnatal rats. With gramicidin perforated-patch recordings, membrane potential was -44 +/- 4 (SE) mV at postnatal days P0-P2, and it progressively shifted to -67 +/- 2 mV at P13-15. A similar developmental change of the membrane potential has been also observed with conventional whole cell recordings. However, the value of the membrane potential deduced from the reversal potential of N-methyl-d-aspartate channels in cell-attached recordings did not change with age and was -77 +/- 2 mV at P2 and -77 +/- 2 mV at P13-14. The membrane potential measured using whole cell recordings correlated with seal and input resistance, being most depolarized in neurons with high, several gigaohms, input resistance and low seal resistance. Simulations revealed that depolarized values of the membrane potential in whole cell and perforated-patch recordings could be explained by a shunt through the seal contact between the pipette and membrane. Thus the membrane potential of CA3 pyramidal cells appears to be strongly negative at birth and does not change during postnatal development.
Embargoed file
Embargoed file
Ne sera jamais visible

Dates and versions

inserm-00484799 , version 1 (19-05-2010)

Identifiers

Cite

Roman Tyzio, Anton Ivanov, Cristophe Bernard, Gregory L. Holmes, Yehezkiel Ben-Ari, et al.. Membrane potential of CA3 hippocampal pyramidal cells during postnatal development.. Journal of Neurophysiology, 2003, 90 (5), pp.2964-72. ⟨10.1152/jn.00172.2003⟩. ⟨inserm-00484799⟩

Collections

INSERM UNIV-AMU
46 View
0 Download

Altmetric

Share

Gmail Facebook Twitter LinkedIn More