Tsuda Sachiko

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  • Preprint
    Probing the function of neuronal populations : combining micromirror-based optogenetic photostimulation with voltage-sensitive dye imaging
    ( 2012-12-04) Tsuda, Sachiko ; Kee, Michelle Z. L. ; Cunha, Catarina ; Kim, Jinsook ; Yan, Ping ; Loew, Leslie M. ; Augustine, George J.
    Recent advances in our understanding of brain function have come from using light to either control or image neuronal activity. Here we describe an approach that combines both techniques: a micromirror array is used to photostimulate populations of presynaptic neurons expressing channelrhodopsin-2, while a red-shifted voltage-sensitive dye allows optical detection of resulting postsynaptic activity. Such technology allowed us to control the activity of cerebellar interneurons while simultaneously recording inhibitory responses in multiple Purkinje neurons, their postsynaptic targets. This approach should substantially accelerate our understanding of information processing by populations of neurons within brain circuits.
  • Article
    Optogenetic mapping of cerebellar inhibitory circuitry reveals spatially biased coordination of interneurons via electrical synapses
    (Cell Press, 2014-05-22) Kim, Jinsook ; Lee, Soojung ; Tsuda, Sachiko ; Zhang, Xuying ; Asrican, Brent ; Gloss, Bernd ; Feng, Guoping ; Augustine, George J.
    We used high-speed optogenetic mapping technology to examine the spatial organization of local inhibitory circuits formed by cerebellar interneurons. Transgenic mice expressing channelrhodopsin-2 exclusively in molecular layer interneurons allowed us to focally photostimulate these neurons, while measuring resulting responses in postsynaptic Purkinje cells. This approach revealed that interneurons converge upon Purkinje cells over a broad area and that at least seven interneurons form functional synapses with a single Purkinje cell. The number of converging interneurons was reduced by treatment with gap junction blockers, revealing that electrical synapses between interneurons contribute substantially to the spatial convergence. Remarkably, gap junction blockers affected convergence in sagittal slices, but not in coronal slices, indicating a sagittal bias in electrical coupling between interneurons. We conclude that electrical synapse networks spatially coordinate interneurons in the cerebellum and may also serve this function in other brain regions.
  • Article
    Next-generation transgenic mice for optogenetic analysis of neural circuits
    (Frontiers Media, 2013-11-26) Asrican, Brent ; Augustine, George J. ; Berglund, Ken ; Chen, Susu ; Chow, Nick ; Deisseroth, Karl ; Feng, Guoping ; Gloss, Bernd ; Hira, Riichiro ; Hoffmann, Carolin ; Kasai, Haruo ; Katarya, Malvika ; Kim, Jinsook ; Kudolo, John ; Lee, Li Ming ; Lo, Shun Qiang ; Mancuso, James ; Matsuzaki, Masanori ; Nakajima, Ryuichi ; Qiu, Li ; Tan, Gregory ; Tang, Yanxia ; Ting, Jonathan T. ; Tsuda, Sachiko ; Wen, Lei ; Zhang, Xuying ; Zhao, Shengli
    Here we characterize several new lines of transgenic mice useful for optogenetic analysis of brain circuit function. These mice express optogenetic probes, such as enhanced halorhodopsin or several different versions of channelrhodopsins, behind various neuron-specific promoters. These mice permit photoinhibition or photostimulation both in vitro and in vivo. Our results also reveal the important influence of fluorescent tags on optogenetic probe expression and function in transgenic mice.