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  • Title: Dendritic K+ channels contribute to spike-timing dependent long-term potentiation in hippocampal pyramidal neurons.
    Author: Watanabe S, Hoffman DA, Migliore M, Johnston D.
    Journal: Proc Natl Acad Sci U S A; 2002 Jun 11; 99(12):8366-71. PubMed ID: 12048251.
    Abstract:
    We investigated the role of A-type K(+) channels for the induction of long-term potentiation (LTP) of Schaffer collateral inputs to hippocampal CA1 pyramidal neurons. When low-amplitude excitatory postsynaptic potentials (EPSPs) were paired with two postsynaptic action potentials in a theta-burst pattern, N-methyl-d-aspartate (NMDA)-receptor-dependent LTP was induced. The amplitudes of the back-propagating action potentials were boosted in the dendrites only when they were coincident with the EPSPs. Mitogen-activated protein kinase (MAPK) inhibitors PD 098059 or U0126 shifted the activation of dendritic K(+) channels to more hyperpolarized potentials, reduced the boosting of dendritic action potentials by EPSPs, and suppressed the induction of LTP. These results support the hypothesis that dendritic K(+) channels and the boosting of back-propagating action potentials contribute to the induction of LTP in CA1 neurons.
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