ArticleThe Journal of neuroscience : the official journal of the Society for Neuroscience2013
A sodium-pump-mediated afterhyperpolarization in pyramidal neurons.
Article in The Journal of neuroscience : the official journal of the Society for Neuroscience, 2013. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 62 papers.
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62 citing papers in PubMed, 109 citations in OpenAlex.
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- Deleting IP6K1 stabilizes neuronal sodium-potassium pumps and suppresses excitability.Molecular brain · 2024Article
- Cholinergic Activation of Corticofugal Circuits in the Adult Mouse Prefrontal Cortex.The Journal of neuroscience : the official journal of the Society for Neuroscience · 2024Article
- Temporal dynamics of Na/K pump mediated memory traces: insights from conductance-based models ofFrontiers in neuroscience · 2023Article
- Neurovascular coupling: motive unknown.Trends in neurosciences · 2022Review
- Tau isoform-specific enhancement of L-type calcium current and augmentation of afterhyperpolarization in rat hippocampal neurons.Scientific reports · 2022Article
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2 more citing papers are in PubMed but not listed here.
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6 authors at 2 institutions in 2 countries.
Funding
Abstract
The sodium-potassium ATPase (i.e., the "sodium pump") plays a central role in maintaining ionic homeostasis in all cells. Although the sodium pump is intrinsically electrogenic and responsive to dynamic changes in intracellular sodium concentration, its role in regulating neuronal excitability remains unclear. Here we describe a physiological role for the sodium pump in regulating the excitability of mouse neocortical layer 5 and hippocampal CA1 pyramidal neurons. Trains of action potentials produced long-lasting (∼20 s) afterhyperpolarizations (AHPs) that were insensitive to blockade of voltage-gated calcium channels or chelation of intracellular calcium, but were blocked by tetrodotoxin, ouabain, or the removal of extracellular potassium. Correspondingly, the AHP time course was similar to the decay of activity-induced increases in intracellular sodium, whereas intracellular calcium decayed at much faster rates. To determine whether physiological patterns of activity engage the sodium pump, we replayed in vitro a place-specific burst of 15 action potentials recorded originally in vivo in a CA1 "place cell" as the animal traversed the associated place field. In both layer 5 and CA1 pyramidal neurons, this "place cell train" generated small, long-lasting AHPs capable of reducing neuronal excitability for many seconds. Place-cell-train-induced AHPs were blocked by ouabain or removal of extracellular potassium, but not by intracellular calcium chelation. Finally, we found calcium contributions to the AHP to be temperature dependent: prominent at room temperature, but largely absent at 35°C. Our results demonstrate a previously unappreciated role for the sodium-potassium ATPase in regulating the excitability of neocortical and hippocampal pyramidal neurons.
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