We develop methods that detect and measure structure and molecular dynamics of dendritic spines, the key components of functional neuronal network. The research includes precise measurements of nano-scale structure of single spines and design of objective criteria for spine classification. Measurements of both spine structure and molecular dynamics will facilitate construction of a model that explains bidirectional interactions between structural changes and dynamic regulation of signaling molecules.
2020
Okabe S. (2020) Recent Advances in Computational Methods for Measurement of Dendritic Spines Imaged by Light Microscopy. Microscopy, 69 (4): 196–213.
doi: 10.1093/jmicro/dfaa016.
Tanaka S., Masuda Y., Harada A., Okabe S. (2020) Impaired actin dynamics and suppression of Shank2-mediated spine enlargement in cortactin knockout mice. Microscopy, 69 (1): 44-52.
doi: 10.1093/jmicro/dfaa001.
Iwasaki K., Obashi K., Okabe S. (2020) Vasodilator-stimulated phosphoprotein (VASP) is recruited into dendritic spines via G-actindependent mechanism and contributes to spine enlargement and stabilization. European Journal of Neuroscience, 51: 806-821.
doi: 10.1111/ejn.14634.
2019
Cho T., Kashiwagi Y., Okabe S. (2019) Temporal sequences of synapse disintegration triggered by afferent axon transection – timelapse imaging study of pre- and post-synaptic molecules. eNEURO 6, ENEURO.0459-18.2019.
doi: 10.1523/ENEURO.0459-18.2019.
Koebis M., Urata S., Shinoda Y., Okabe S., Yamasoba T., Nakao K., Aiba A., Furuichi T. (2019) LAMP5 in presynaptic inhibitory terminals in the hindbrain and spinal cord: a role in startle response and auditory processing, Molecular Brain, 12: 20.
doi: 10.1186/s13041-019-0437-4.
Takahashi A., Parajuli L.M., Iwasaki H., Tanaka S., Okabe S. (2019) Ultrastructural observation of glutamatergic synapses by focused ion beam scanning electron microscopy (FIB/SEM), Methods in Molecular Biology, 1941: 17-27.
doi: 10.1007/978-1-4939-9077-1_2.
Iguchi R., Tanaka S., Okabe S. (2019) Neonatal social isolation increases the proportion of the immature spines in the layer 2/3 pyramidal neurons of the somatosensory cortex. Neuroscience Research, pii: S0168-0102 (19): 30046-X.
doi:10.1016/j.neures.2019.05.004.
Obashi K., Matsuda A., Inoue Y., Okabe S. (2019) Precise temporal regulation of molecular diffusion within dendritic spines by actin polymers during structural plasticity. Cell Reports, 27(5): 1503-1515. e8.
doi:10.1016/j.celrep.2019.04.006.
Li J., Sekine-Aizawa Y., Ebrahimi S., Tanaka S., Okabe S. (2019) Tumor suppressor protein CYLD regulates morphogenesis of dendrites and spines. European Journal of Neuroscience, 00: 1– 18.
doi:10.1111/ejn.14421.
Sato Y., Okabe S. (2019) Nano-scale analysis of synapse morphology in an autism mouse model with 15q11-13 copy number variation using focused ion beam milling and scanning electron microscopy. Microscopy (Oxf). 68(2): 122-132.
doi:10.1093/jmicro/dfy128.
Kashiwagi Y., Higashi T., Obashi K., Sato Y., Komiyama N., Grant S. G. N., Okabe S. (2019) Computational geometry analysis of dendritic spines by structured illumination microscopy. Nature Communications, 10(1): 1285.
doi: 10.1038/s41467-019-09337-0.
Urata S., Iida T., Yamamoto M., Mizushima Y., Fujimoto C., Matsumoto Y., Yamasoba T. Okabe S. (2019) Cellular cartography of the organ of Corti based on optical tissue clearing and machine learning. eLIFE, 8: e40946.
doi:10.7554/eLife.40946.
Iida T., Tanaka S., Okabe S. (2019) Spatial impact of microglial distribution on dynamics of dendritic spines. European Journal of Neuroscience, 49(11): 1400-1417.
doi:10.1111/ejn.14325.
2018
Ito H., Kawamata Y., Kamiya M., Tsuda K., Tanaka S., Ueno T., Komatsu T., Hanaoka K., Okabe S., Miura M., Urano Y. (2018) Red-shifted fluorogenic substrate for detecting lacZ-positive cells in living tissue with single-cell resolution. Angewandte Chemie Int. Ed. Engl., 57 (48): 15702-15706.
doi: 10.1002/anie.201808670.
Tzeng T.C., Hasegawa Y., Iguchi R., Caffrey D.R., Thatcher E.J., Mao W.J., Germain G., Tamburro N.D., Okabe S., Heneka M., Latz E., Futai K., Golenbock D.T. (2018) Inflammasome-derived cytokine IL18 suppresses amyloid-induced seizures in Alzheimer’s
prone mice. Proc. Natl. Acad. Sci. USA. 115 (36), 9002-9007.
doi: 10.1073/pnas.1801802115.
Nakayama H., Abe M., Morimoto C., Iida T., Okabe S., Sakimura K., Hashimoto K. (2018) Microglia permit climbing fiber elimination by promoting GABAergic inhibition in the developing cerebellum. Nature Communications 9: 2830.
doi: 10.1038/s41467-018-05100-z.
Morimoto M., Tanaka S., Mizutani S., Urata S., Kobayashi K. Okabe S. (2018) In vivo observation of structural changes in neocortical catecholaminergic projections in response to drugs of abuse. eNeuro, 6: 5 (1).
doi:10.1523/ENEURO.0071-17.2018.
Higashi T., Tanaka S., Iida T., Okabe S. (2018) Synapse elimination triggered by BMP4 exocytosis and presynaptic BMP receptor activation. Cell Reports, 22 (4): 919-929.
doi:10.1016/j.celrep.2017.12.101.
Chen S., Weitemier A. Z., Zeng X., He L., Wang X., Tao Y., Huang A. J. Y., Hashimotodani Y., Kano M., Iwasaki H., Parajuli L..K., Okabe S., Teh D. B. L., All A. H., Tsutsui-Kimura I., Tanaka K. F., Liu X., McHugh T. J. (2018) Near-infrared deep brain stimulation via upconversion nanoparticle-mediated optogenetics. Science, 359: 679-684.
doi:10.1126/science.aaq1144.
2017
Parajuli L. K., Tanaka S., Okabe S. (2017) Insights into age-old questions of new dendritic spines: From form to function. Brain Research Bulletin, 129: 3-11.
doi:10.1016/j.brainresbull.2016.07.014.
Hirai S., Hotta K., Kubo Y., Nishino A., Okabe S., Okamura Y., Okado H. (2017) AMPA glutamate receptors are required for sensory-organ formation and morphogenesis in the basal chordate. Proc. Natl. Acad. Sci. USA., 114: 3939-3944.
doi:10.1073/pnas.1612943114.
Nakai N., Nagano M., Saitow F., Watanabe W., Kawamura Y., Kawamoto A., Tamada K., Mizuma H., Onoe H., Watanabe Y., Monai H., Hirase H., Nakatani J., Inagaki H., Kawada T., Miyazaki T., Watanabe M., Sato Y., Okabe S., Kitamura K., Kano M., Hashimoto K., Suzuki H., Takumi T. (2017) Serotonin rebalances cortical tuning and behavior linked to autism symptoms in 15q11-13 CNV mice. Science Advances, 3: e1603001.
doi:10.1126/sciadv.1603001.
Yokoyama T., Lee J-K., Miwa K., Opthof T., Tomoyama S., Nakanishi H., Yoshida A., Yasui H., Iida T., Miyagawa S., Okabe S., Sawa Y., Sakata Y., Komuro I. (2017) Quantification of sympathetic hyperinnervation and denervation after myocardial infarction by three-dimensional assessment of the cardiac sympathetic network in cleared transparent murine hearts. PLoS One, 12: e0182072.
doi:10.1371/journal.pone.0182072.
Okabe S. (2017) Fluorescence imaging of synapse dynamics in normal circuit maturation and in developmental disorders. Proceedings of the Japan Academy Series B, 93: 483-497.
doi:10.2183/pjab.93.029.
Koeberle S. C., Tanaka S., Kuriu T., Iwasaki H., Koeberle, A., Schulz, A., Helbing, D., Yamagata, Y., Morrison, H., and S. Okabe (2017) Developmental stage-dependent regulation of spine formation by calcium-calmodulin dependent protein kinase IIα and Rap1. Scientific Reports, 7: 13409.
doi:10.1038/s41598-017-13728-y.
