Limbic epilepsy in transgenic mice carrying a Ca2+/calmodulin-dependent kinase II alpha-subunit mutation.

Published

Journal Article

Multifunctional Ca2+/calmodulin-dependent protein kinase II (CaMK) phosphorylates proteins pivotally involved in diverse neuronal processes and thereby coordinates cellular responses to external stimuli that regulate intracellular Ca2+ [Hanson, P. I. & Schulman, H. (1992) Annu. Rev. Biochem. 61, 559-664]. Despite extensive study, the impact of this enzyme on control of the excitability of neuron populations in the mammalian nervous system in situ is unknown. To address this question, we studied transgenic mice carrying a null mutation (-/-) for the alpha subunit of CaMK. In contrast to wild-type littermates, null mutants exhibit profound hyperexcitability, evident in epileptic seizures involving limbic structures including the hippocampus. No evidence of increased excitability was detected in mice carrying null mutations of the gamma isoform of protein kinase C, underscoring the specificity of the effect of CaMK. CaMK plays a powerful and previously underappreciated role in control of neuronal excitability in the mammalian nervous system. These insights have important implications for analyses of mechanisms of epilepsy and, perhaps, learning and memory.

Full Text

Duke Authors

Cited Authors

  • Butler, LS; Silva, AJ; Abeliovich, A; Watanabe, Y; Tonegawa, S; McNamara, JO

Published Date

  • July 1995

Published In

Volume / Issue

  • 92 / 15

Start / End Page

  • 6852 - 6855

PubMed ID

  • 7624331

Pubmed Central ID

  • 7624331

Electronic International Standard Serial Number (EISSN)

  • 1091-6490

International Standard Serial Number (ISSN)

  • 0027-8424

Digital Object Identifier (DOI)

  • 10.1073/pnas.92.15.6852

Language

  • eng