Kindling enhances sensitivity of CA3 hippocampal pyramidal cells to NMDA.

Published

Journal Article

Kindling is a form of experimental epileptogenesis in which periodic electrical stimulation of a brain pathway induces a permanently hyperexcitable state. Previous studies suggested that kindling might be explained, at least in part, by an increased sensitivity of brain neurons to NMDA receptor agonists. This possibility was investigated with the use of grease-gap preparations for assaying the depolarizing responses of CA3 and CA1 hippocampal pyramidal cells to amino acid excitants. When studied 1-2 months after the last evoked seizure, CA3 pyramidal cells from kindled rats were five- to sixfold more sensitive to NMDA than CA3 pyramidal cells from controls. A similar, though smaller, effect of stimulation was observed 1 d after the last evoked seizure. The greater potency of NMDA in kindled rats can probably be explained by enhanced expression of NMDA receptors in the presence of a receptor reserve. The stimulation protocol did not alter the ability of Mg2+ to reduce NMDA potency. It also affected neither the response of CA3 pyramidal cells to AMPA [(RS)-alpha-amino-3-hydroxy-5-methyl-4-isoxazolepropionate] nor the response of CA1 pyramidal cells to NMDA or AMPA. In area CA3, the potency of NMDA, but not of AMPA, declined 2.5-4-fold over the 1-2 month experimental period, apparently as a result of increasing age. This age-related loss of sensitivity to NMDA was completely prevented by kindling. These findings suggest that kindling prevents a loss of NMDA receptor function in CA3 pyramidal cells that normally occurs during early adulthood. Such a change could contribute to maintenance of the kindled state.

Full Text

Duke Authors

Cited Authors

  • Martin, D; McNamara, JO; Nadler, JV

Published Date

  • May 1992

Published In

Volume / Issue

  • 12 / 5

Start / End Page

  • 1928 - 1935

PubMed ID

  • 1374464

Pubmed Central ID

  • 1374464

Electronic International Standard Serial Number (EISSN)

  • 1529-2401

International Standard Serial Number (ISSN)

  • 0270-6474

Digital Object Identifier (DOI)

  • 10.1523/jneurosci.12-05-01928.1992

Language

  • eng