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コダマ タカシ
Kodama Takashi
児玉 貴史 所属 医学部 医学科 職種 講師 |
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| 論文種別 | 原著 |
| 言語種別 | 英語 |
| 査読の有無 | 査読あり |
| 表題 | Graded Coexpression of Ion Channel, Neurofilament, and Synaptic Genes in Fast-Spiking Vestibular Nucleus Neurons. |
| 掲載誌名 | 正式名：The Journal of neuroscience : the official journal of the Society for Neuroscience 略 称：J Neurosci ISSNコード：15292401/02706474 |
| 掲載区分 | 国外 |
| 巻・号・頁 | 40(3),pp.496-508 |
| 著者・共著者 | Kodama Takashi, Gittis Aryn H, Shin Minyoung, Kelleher Keith, Kolkman Kristine E, McElvain Lauren, Lam Minh, du Lac Sascha |
| 担当区分 | 筆頭著者,責任著者 |
| 発行年月 | 2020/01 |
| 概要 | Computations that require speed and temporal precision are implemented throughout the nervous system by neurons capable of firing at very high rates, rapidly encoding and transmitting a rich amount of information, but with substantial metabolic and physical costs. For economical fast spiking and high throughput information processing, neurons need to optimize multiple biophysical properties in parallel, but the mechanisms of this coordination remain unknown. We hypothesized that coordinated gene expression may underlie the coordinated tuning of the biophysical properties required for rapid firing and signal transmission. Taking advantage of the diversity of fast-spiking cell types in the medial vestibular nucleus of mice of both sexes, we examined the relationship between gene expression, ionic currents, and neuronal firing capacity. Across excitatory and inhibitory cell types, genes encoding voltage-gated ion channels responsible for depolarizing and repolarizing the action potential were tightly coexpressed, and their absolute expression levels increased with maximal firing rate. Remarkably, this coordinated gene expression extended to neurofilaments and specific presynaptic molecules, providing a mechanism for coregulating axon caliber and transmitter release to match firing capacity. These findings suggest the presence of a module of genes, which is coexpressed in a graded manner and jointly tunes multiple biophysical properties for economical differentiation of firing capacity. The graded tuning of fast-spiking capacity by the absolute expression levels of specific ion channels provides a counterexample to the widely held assumption that cell-type-specific firing patterns can be achieved via a vast combination of different ion channels.SIGNIFICANCE STATEMENT Although essential roles of fast-spiking neurons in various neural circuits have been widely recognized, it remains unclear how neurons efficiently coordinate the multiple biophysical properties required to |
| DOI | 10.1523/JNEUROSCI.1500-19.2019 |
| PMID | 31719168 |