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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Mutation I810N in the α3 isoform of Na~+,K~+-ATPase causes impairments in the sodium pump and hyperexcitability in the CNS
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Mutation I810N in the α3 isoform of Na~+,K~+-ATPase causes impairments in the sodium pump and hyperexcitability in the CNS

机译:Na〜+,K〜+ -ATPaseα3亚型中的I810N突变导致钠泵受损和CNS过度兴奋

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摘要

In a mouse mutagenesis screen, we isolated a mutant, Myshkin (Myk), with autosomal dominant complex partial and secondarily generalized seizures, a greatly reduced threshold for hippocampal seizures in vitro, posttetanic hyperexcitability of the CA3-CA1 hippocampal pathway, and neuronal degeneration in the hippocampus. Positional cloning and functional analysis revealed that Myk/+ mice carry a mutation (I810N) which renders the normally expressed Na~+,K~+-ATPase α3 isoform inactive. Total Na~+,K~+-ATPase activity was reduced by 42% in Mykl+ brain. The epilepsy in Mykl+ mice and in vitro hyperexcitability could be prevented by delivery of additional copies of wild-type Na~+,K~+-ATPase α3 by transgenesis, which also rescued Na~+,K~+-ATPase activity. Our findings reveal the functional significance of the Na~+,K~+-ATPase α3 isoform in the control of epileptiform activity and seizure behavior.
机译:在小鼠诱变筛选中,我们分离了一个突变体Myshkin(Myk),具有常染色体显性复合体部分和第二次全身性癫痫发作,大大降低了体外海马癫痫发作的阈值,CA3-CA1海马途径的强直性过度兴奋性以及海马。位置克隆和功能分析表明,Myk / +小鼠携带一个突变(I810N),使正常表达的Na〜+,K〜+ -ATPaseα3亚型失活。 Mykl +脑中的总Na〜+,K〜+ -ATPase活性降低了42%。 Mykl +小鼠的癫痫病和体外过度兴奋性可以通过转基因传递额外拷贝的野生型Na〜+,K〜+ -ATPaseα3来预防,这也可以挽救Na〜+,K〜+ -ATPase的活性。我们的发现揭示了Na〜+,K〜+ -ATPaseα3亚型在控制癫痫样活动和癫痫发作行为中的功能意义。

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    Samuel Lunenfeld Research Institute, Mount Sinai Hospital, Toronto, ON, Canada M5G 1X5 Institute of Membrane and Systems Biology, University of Leeds, Leeds LS2 9JT, United Kingdom;

    Samuel Lunenfeld Research Institute, Mount Sinai Hospital, Toronto, ON, Canada M5G 1X5;

    Samuel Lunenfeld Research Institute, Mount Sinai Hospital, Toronto, ON, Canada M5G 1X5;

    Samuel Lunenfeld Research Institute, Mount Sinai Hospital, Toronto, ON, Canada M5G 1X5 Departments of Medical Biophysics, Medical Genetics, Paediatrics, and Pharmaceutical Sciences, University of Toronto, Toronto, ON, Canada M5S 1A1;

    Samuel Lunenfeld Research Institute, Mount Sinai Hospital, Toronto, ON, Canada M5G 1X5;

    Department of Physiology and Biophysics, Centre for Membrane Pumps in Cells and Disease-PUMPKIN, Danish National Research Foundation, University of Aarhus, DK-8000 Aarhus, Denmark;

    Department of Physiology and Biophysics, Centre for Membrane Pumps in Cells and Disease-PUMPKIN, Danish National Research Foundation, University of Aarhus, DK-8000 Aarhus, Denmark;

    Samuel Lunenfeld Research Institute, Mount Sinai Hospital, Toronto, ON, Canada M5G 1X5 Departments of Medical Biophysics, Medical Genetics, Paediatrics, and Pharmaceutical Sciences, University of Toronto, Toronto, ON, Canada M5S 1A1;

    Samuel Lunenfeld Research Institute, Mount Sinai Hospital, Toronto, ON, Canada M5G 1X5 Departments of Medical Biophysics, Medical Genetics, Paediatrics, and Pharmaceutical Sciences, University of Toronto, Toronto, ON, Canada M5S 1A1;

    Mouse Imaging Centre, Program in Genetics and Genome Biology, and Divisions of Neurology and Pathology, Hospital for Sick Children, Toronto, ON, Canada M5G 1X8;

    Departments of Medical Biophysics, Medical Genetics, Paediatrics, and Pharmaceutical Sciences, University of Toronto, Toronto, ON, Canada M5S 1A1 Mouse Imaging Centre, Program in Genetics and Genome Biology, and Divisions of Neurology and Pathology, Hospital for Sick Children, Toronto, ON, Canada M5G 1X8;

    Mouse Imaging Centre, Program in Genetics and Genome Biology, and Divisions of Neurology and Pathology, Hospital for Sick Children, Toronto, ON, Canada M5G 1X8;

    Departments of Medical Biophysics, Medical Genetics, Paediatrics, and Pharmaceutical Sciences, University of Toronto, Toronto, ON, Canada M5S 1A1 Mouse Imaging Centre, Program in Genetics and Genome Biology, and Divisions of Neurology and Pathology, Hospital for Sick Children, Toronto, ON, Canada M5G 1X8;

    Departments of Medical Biophysics, Medical Genetics, Paediatrics, and Pharmaceutical Sciences, University of Toronto, Toronto, ON, Canada M5S 1A1 Mouse Imaging Centre, Program in Genetics and Genome Biology, and Divisions of Neurology and Pathology, Hospital for Sick Children, Toronto, ON, Canada M5G 1X8;

    Departments of Medical Biophysics, Medical Genetics, Paediatrics, and Pharmaceutical Sciences, University of Toronto, Toronto, ON, Canada M5S 1A1;

    Department of Physiology and Biophysics, Centre for Membrane Pumps in Cells and Disease-PUMPKIN, Danish National Research Foundation, University of Aarhus, DK-8000 Aarhus, Denmark;

    Samuel Lunenfeld Research Institute, Mount Sinai Hospital, Toronto, ON, Canada M5G 1X5 Departments of Medical Biophysics, Medical Genetics, Paediatrics, and Pharmaceutical Sciences, University of Toronto, Toronto, ON, Canada M5S 1A1;

  • 收录信息 美国《科学引文索引》(SCI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    alpha3 Na~+; K~+ ATPase; BAC rescue; epilepsy; forward genetic screen; mouse;

    机译:α3Na〜+;K〜+ ATPase;BAC营救;癫痫;前向遗传筛选老鼠;

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