Dendritic Inhibition Terminates Plateau Potentials in CA1 Pyramidal Neurons.

Overview

1. Department of Neuroscience, Center for Neuroscience, University of Pittsburgh, Pittsburgh, Pennsylvania 15260
2. Neuroscience Institute, New York University Grossman School of Medicine, New York, New York 10016

Abstract

In CA1 pyramidal neurons (CA1-PYRs), plateau potentials control synaptic plasticity and the emergence of place cell identity. Here, we show that dendritic inhibition terminates plateaus in an all-or-none manner in CA1-PYRs recorded in acute hippocampal slices from mice of either sex. Plateaus were initially resistant to inhibition but became increasingly susceptible to termination as they progressed. Two subtypes of dendrite-targeting oriens-lacunosum moleculare (OLM) interneurons, accessed in transgenic mice based on the expression of the genes Ndnf or Chrna2 (OLMNdnf and OLMα2, respectively), could terminate plateau potentials. OLMNdnf generated slower postsynaptic currents that terminated plateaus more effectively than OLMα2. Voltage-gated Ca2+ channels (VGCCs) were necessary for plateaus, which were prolonged by blocking small-conductance Ca2+–activated K+ channels (SK). A single-compartment model with these two conductances recapitulated core experimental findings and provided a mechanistic explanation for terminations. Plateaus arose from VGCCs maintained in the active state by sustained Ca2+ influx, a positive feedback loop that was quasi-balanced by ISK. Inhibition terminated plateaus by driving the membrane potential below a dynamic threshold to deactivate VGCCs and end the positive feedback loop. Similar all-or-none termination dynamics were observed for plateaus evoked under cholinergic modulation. Lastly, two-photon Ca2+ imaging showed that plateaus evoke large dendritic Ca2+ transients that were graded by terminations. Overall, our results demonstrate how the feedback inhibitory circuit interacts with intrinsic cellular mechanisms to regulate plateau potentials and shape dendritic Ca2+ signals in CA1-PYRs.

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Version 1, 28 September 2026: the first record

Recorded: type, language, journal, volume, issue, pages, dates, 6 authors, 5 keywords, 13 MeSH terms, 3 funders, 117 references.

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This paper

Vaasjo, L. O., Kotermanski, S. E., Patel, T., Shi, H. J., Machold, R., & Chamberland, S. (2026). Dendritic Inhibition Terminates Plateau Potentials in CA1 Pyramidal Neurons. The Journal of neuroscience : the official journal of the Society for Neuroscience, 46(20), e1540252026. https://doi.org/10.1523/jneurosci.1540-25.2026

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