Chronic Co-variation of Neural Network Configuration and Activity in Mature Dissociated Cultures

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  • Okawa Satoru
    Graduate School of Information Science and Technology, The University of Tokyo
  • Mita Takeshi
    Graduate School of Information Science and Technology, The University of Tokyo
  • Bakkum Douglas
    Department of Biosystems Science and Engineering, ETH Zurich
  • Frey Urs
    RIKEN Quantitative Biology Center
  • Hierlemann Andreas
    Department of Biosystems Science and Engineering, ETH Zurich
  • Kanzaki Ryohei
    Graduate School of Information Science and Technology, The University of Tokyo Research Center for Advanced Science and Technology, The University of Tokyo
  • Takahashi Hirokazu
    Graduate School of Information Science and Technology, The University of Tokyo Research Center for Advanced Science and Technology, The University of Tokyo

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Other Title
  • 成熟した培養神経回路のネットワーク形状と活動の経時変化
  • セイジュク シタ バイヨウ シンケイ カイロ ノ ネットワーク ケイジョウ ト カツドウ ノ ケイジ ヘンカ

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Abstract

Spatio-temporal neural patterns depend on the physical structure of neural circuits. Neural plasticity can thus be associated with changes in the circuit structure. For example, newborn neurons migrate towards existing, already matured neural networks in order to participate in neural computation. In the present study, we have conducted two experiments to investigate how neural migration is associated with the development of neural activity in primary dissociated cultures of neuronal cells. In Experiment 1, using a mature culture, a high-density CMOS micro-electrode array was used to continuously monitor neural migration and activity for more than two weeks. Consequently, we found that even in mature neuronal cultures neurons moved 2.0±1.0 µm a day and that the moving distance was negatively correlated with their firing rate, suggesting that neurons featuring low firing rates tend to migrate actively. In Experiment 2 using a co-culture of mature and immature neurons, we found that immature neurons moved more actively than matured neurons to achieve functional connections to other neurons. These findings suggest that neurons with low firing rates as well as newborn neurons actively migrate in order to establish their connections and function in a neuronal network.

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