Zn2+ blocks the NMDA- and Ca2+ -triggered postexposure current ipe in hippocampal pyramidal cells.

Abstract:

:Whole cell voltage-clamp recordings from acutely isolated hippocampal CA1 pyramidal cells from adult guinea pigs were used to evaluate divalent cations as possible blockers of the postexposure current (Ipe). Ipe is a cation current that is triggered by the rise in intracellular Ca2+ concentration that occurs after the application of a toxic level of N-methyl-D-aspartate (NMDA). Once triggered, Ipe continues to grow until death of the neuron occurs. Ipe may be a critical link between transient NMDA exposure and cell death. Ipe was blocked by micromolar concentrations of Zn2+. The Zn2+ effect had an IC50 of 64 microM and saturated at 500 microM. Prolonged Zn2+ block of Ipe revealed that the maintenance of a steady Ipe is not dependent on Ipe-mediated Ca2+ influx but that the continuous growth in Ipe is dependent on Ipe-mediated Ca2+ influx. The availability of an effective blocker of Ipe should facilitate the investigation of the intracellular activation pathway of Ipe and the role of Ipe in neuronal death.

journal_name

J Neurophysiol

authors

Chen QX,Perkins KL,Wong RK

doi

10.1152/jn.1998.79.2.1124

subject

Has Abstract

pub_date

1998-02-01 00:00:00

pages

1124-6

issue

2

eissn

0022-3077

issn

1522-1598

journal_volume

79

pub_type

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