A Sodium-Pump-Mediated Afterhyperpolarization in Pyramidal Neurons

被引:74
作者
Gulledge, Allan T. [1 ,2 ]
Dasari, Sameera [1 ]
Onoue, Keita [1 ]
Stephens, Emily K. [1 ,2 ]
Hasse, J. Michael [1 ,2 ]
Avesar, Daniel [1 ,2 ]
机构
[1] Geisel Sch Med Dartmouth, Dept Physiol & Neurobiol, Lebanon, NH 03756 USA
[2] Geisel Sch Med Dartmouth, Program Expt & Mol Med, Lebanon, NH 03756 USA
基金
美国国家卫生研究院; 美国国家科学基金会;
关键词
CA2+-ACTIVATED K+ CURRENT; RAT HIPPOCAMPAL-NEURONS; CAT SENSORIMOTOR CORTEX; SLOW AFTERHYPERPOLARIZATION; AFTER-HYPERPOLARIZATION; POSTTETANIC HYPERPOLARIZATION; PHOTOLYTIC MANIPULATION; NEOCORTICAL NEURONS; POTASSIUM CURRENTS; CEREBRAL-CORTEX;
D O I
10.1523/JNEUROSCI.0220-13.2013
中图分类号
Q189 [神经科学];
学科分类号
071006 ;
摘要
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 (similar to 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 degrees C. Our results demonstrate a previously unappreciated role for the sodium-potassium ATPase in regulating the excitability of neocortical and hippocampal pyramidal neurons.
引用
收藏
页码:13025 / 13041
页数:17
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