Details of a Researcher - Okano, Hideyuki

Papers - Okano, Hideyuki

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In vivo PET measurements with [¹¹C]PE2I to evaluate fetal mesencephalic transplantations to unilateral 6-OHDA-lesioned rats

Inaji Motoki, Yoshizaki Takahito, Okauchi Takashi, Maeda Jun, Nagai Yuji, Nariai Tadashi, Ohno Kikuo, Ando Kiyoshi, Okano Hideyuki, Obayashi Shigeru, Suhara Tetsuya

Cell Transplantation 14 ( 9 ) 655 - 663 2005

ISSN 0963-6897

Positron emission tomography (PET) is a useful tool to assess and visualize neurotransmissions in vivo. In this study, we performed repeated PET scans with [¹¹C]PE2I, a tracer of the dopamine transporter, to evaluate the alteration of the expression of dopamine (DA) transmission component after a fetal mesencephalic transplantation. The fetal mesencephalic cells were transplanted into the striatum of unilateral 6-OHDA-lesioned rats. PET scans with [¹¹C]PE2I were performed to evaluate the DA transporter before and 2 and 4 weeks after the transplantation. Rotation behavior tests, in vitro autoradiography, measurements of DA contents in the striatum by high-performance liquid chromatography (HPLC), and tyrosine hydroxylase (TH) immunohistological examinations were performed at the same time points and examined for their relationship to changes in the dopamine transporter. The number of ipsilateral rotations induced by methamphetamine injections decreased. DA contents in the striatum measured with HPLC significantly increased. In the PET study, the binding potential of [¹¹C]PE2I increased at 4 weeks. The results of the in vitro autoradiography study corresponded with those of the PET study. The degrees of the change in the binding potentials correlated with those of the numbers of rotations in the behavioral study and the DA contents in the striatum. In the histological examination, TH-positive cells with axons were observed at 2 and 4 weeks after the transplantation. As the dopamine transporter exists only in the axon terminal of DA neurons, these results suggested that PET measurements of [¹¹C]PE2I binding indicated not only survival, but maturity and functioning of the transplanted cells. Repeated PET measurements of DA transporters are a useful tool in assessing the effectiveness of neural transplantations. Copyright © 2005 Cognizant Comm. Corp.

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Effect of neurosphere size on the growth rate of human neural stem/progenitor cells

Mori Hideki, Ninomiya Kazuaki, Kino-Oka Masahiro, Shofuda Tomoko, Islam Mohammed Omedul, Yamasaki Mami, Okano Hideyuki, Taya Masahito, Kanemura Yonehiro

Journal of Neuroscience Research 84 ( 8 ) 1682 - 1691 2006.12

ISSN 0360-4012

Neural stem/progenitor cells (NSPCs) proliferate as aggregates in vitro, but the mechanism of aggregation is not fully understood. Here, we report that aggregation promotes the proliferation of NSPCs. We found that the proliferation rate was linear and depended on the size of the aggregate; that is, the population doubling time of the NSPCs gradually decreased as the diameter approached 250 μm and flattened to a nearly constant value beyond this diameter. Given this finding, and with the intent of enhancing the efficiency of human NSPC expansion, we induced the NSPCs to form aggregates close to 250 μm in diameter quickly by culturing them in plates with U-bottomed wells. The NSPCs formed aggregates effectively in the U-bottomed wells, with cell numbers approximately 1.5 times greater than those in the aggregates that formed spontaneously in flat-bottomed wells. In addition, this effect of aggregation involved cell-cell signaling molecules of the Notch1 pathway. In the U-bottomed wells, Hes1 and Hes5, which are target genes of the Notch signal, were expressed at higher levels than in the control, flat-bottomed wells. The amount of cleaved Notch1 was also higher in the cells cultured in the U-bottomed wells. The addition of γ-secretase inhibitor, which blocks Notch signaling, suppressed cell proliferation in the U-bottomed wells. These results suggest that the three-dimensional architecture of NSPC aggregates would create a microenvironment that promotes the proliferation of human NSPCs. © 2006 Wiley-Liss, Inc.

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Neuroprotective effects of angiotensin II type 1 receptor (AT1R) blocker, telmisartan, via modulating AT1R and AT2R signaling in retinal inflammation

Kurihara, Toshihide, Ozawa, Yoko, Shinoda, Kei, Nagai, Norihiro, Inoue, Makoto, Oike, Yuichi, Tsubota, Kazuo, Ishida, Susumu, Okano, Hideyuki

INVESTIGATIVE OPHTHALMOLOGY & VISUAL SCIENCE 47 ( 12 ) 5545 - 5552 2006.12

Research paper (scientific journal), ISSN 0146-0404

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Neutralization of ciliary neurotrophic factor reduces astrocyte production from transplanted neural stem cells and promotes regeneration of corticospinal tract fibers in spinal cord injury

Ishii, Ken, Nakamura, Masaya, Dai, HaiNing, Finn, Tom P., Okano, Hideyuki, Toyama, Yoshiaki, Bregman, Barbara S.

JOURNAL OF NEUROSCIENCE RESEARCH 84 ( 8 ) 1669 - 1681 2006.12

Research paper (scientific journal), ISSN 0360-4012

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An oncolytic HSV1 mutant expressing ICP34.5 under control of a nestin promoter increases survival of animals, even when symptomatic from a brain tumor

Kambara, Hirokazu, Ichikawa, Tomotugu, Inoue, Satoshi, Kosaka, Hiroshi, Okano, Hideyuki, Chiocca, E. Antonio, Saeki, Yoshinaga, Date, Isao

JOURNAL OF GENE MEDICINE 8 ( 12 ) 1453 - 1453 2006.12

Research paper (scientific journal), ISSN 1099-498X

Expression of Musashi-1 in normal and regenerating retinas of adult newt

Kaneko, Jun, Okano, Hideyuki, Chiba, Chikafumi

ZOOLOGICAL SCIENCE 23 ( 12 ) 1180 - 1180 2006.12

Research paper (scientific journal), ISSN 0289-0003

A practical device for pinpoint delivery of molecules into multiple neurons in culture

Hara, Chikako, Tateyama, Kiyohiko, Akamatsu, Naoki, Imabayashi, Hiroyuki, Karaki, Koichi, Nomura, Nobuo, Okano, Hideyuki, Miyawaki, Atsushi

BRAIN CELL BIOLOGY 35 ( 4-6 ) 229 - 237 2006.12

Research paper (scientific journal), ISSN 1559-7105

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Effects of a moderate-intensity static magnetic field on VEGF-A stimulated endothelial capillary tubule formation in vitro

Okano, Hideyuki, Onmori, Rie, Tomita, Naohide, Ikada, Yoshito

BIOELECTROMAGNETICS 27 ( 8 ) 628 - 640 2006.12

Research paper (scientific journal), ISSN 0197-8462

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Isolation of multipotent neural crest-derived stem cells from the adult mouse cornea

Yoshida, Satoru, Shimmura, Shigeto, Nagoshi, Narihito, Fukuda, Keiichi, Matsuzaki, Yumi, Okano, Hideyuki, Tsubota, Kazuo

STEM CELLS 24 ( 12 ) 2714 - 2722 2006.12

Research paper (scientific journal), ISSN 1066-5099

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A selective Sema3A inhibitor enhances regenerative responses and functional recovery of the injured spinal cord

Kaneko, Shinjiro, Iwanami, Akio, Nakamura, Masaya, Kishino, Akiyoshi, Kikuchi, Kaoru, Shibata, Shinsuke, Okano, Hirotaka J., Ikegami, Takeshi, Moriya, Ayako, Konishi, Osamu, Nakayama, Chikao, Kumagai, Kazuo, Kimura, Toru, Sato, Yasufumi, Goshima, Yoshio, Taniguchi, Masahiko, Ito, Mamoru, He, Zhigang, Toyama, Yoshiaki, Okano, Hideyuki

NATURE MEDICINE 12 ( 12 ) 1380 - 1389 2006.12

Research paper (scientific journal), ISSN 1078-8956

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Roles of RNA binding proteins in neural development

Yano Masato, Okano Hirotaka James, Okano Hideyuki

Tanpakushitsu kakusan koso. Protein, nucleic acid, enzyme 51 ( 16 Suppl ) 2603 - 2608 2006.12

ISSN 0039-9450

Bidirectional regulation of dopamine D2 and neurotensin NTS1 receptors in dopamine neurons

Jomphe C., Lemelin P. L., Okano H., Kobayashi K., Trudeau L. E.

European Journal of Neuroscience 24 ( 10 ) 2789 - 2800 2006.12

ISSN 0953-816X

Several lines of evidence suggest a close association between dopamine (DA) and neurotensin (NT) systems in the CNS. Indeed, in the rodent brain, abundant NT-containing fibres are found in DA-rich areas such as the ventral tegmental area and substantia nigra. Moreover, it has been shown in vivo that NT, acting through its high-affinity receptor (NTS1), reduces the physiological and behavioural effects of DA D2 receptor (D2R) activation, a critical autoreceptor feedback system regulating DA neurotransmission. However, the mechanism of this interaction is still elusive. The aim of our study was thus to reproduce in vitro the interaction between D2R and NTS1, and then to characterize the mechanisms implicated. We used a primary culture model of DA neurons prepared from transgenic mice expressing green fluorescent protein under the control of the tyrosine hydroxylase promoter. In these cultures, DA neurons endogenously express both D2R and NTS1. Using electrophysiological recordings, we show that activation of D2R directly inhibits the firing rate of DA neurons. In addition, we find that NT, acting through a NTS1-like receptor, is able to reduce D2R autoreceptor function independently of its ability to enhance DA neuron firing, and that this interaction occurs through a protein kinase C- and Ca ²⁺-dependent mechanism. Furthermore, prior activation of D2R reduces the ability of NTS1 to induce intracellular Ca²⁺ mobilization. Our findings provide evidence for bidirectional interaction between D2R and NTS1 in DA neurons, a regulatory mechanism that could play a key role in the control of the activity of these neurons. © The Authors (2006).

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Generation of neural cells from embryonic stem cells

Shimazaki Takuya, Okada Yohei, Yoshizaki Takahito, Okano Hideyuki

Tanpakushitsu kakusan koso. Protein, nucleic acid, enzyme 51 ( 13 ) 1854 - 1861 2006.11

ISSN 0039-9450

Enhanced therapeutic efficacy of oncotytic herpes vector G207 against human non-small cell lung cancer - expression of an RNA-binding protein, Musashi1, as a marker for the tailored gene therapy

Kanai, Ryuichi, Eguchi, Keisuke, Takahashi, Miwa, Goldman, Steven, Okano, Hideyuki, Kawase, Takeshi, Yazaki, Takahito

JOURNAL OF GENE MEDICINE 8 ( 11 ) 1329 - 1340 2006.11

Research paper (scientific journal), ISSN 1099-498X

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Bcl2 enhances survival of newborn neurons in the normal and ischemic hippocampus

Sasaki, Tsutomu, Kitagawa, Kazuo, Yagita, Yoshiki, Sugiura, Shiro, Omura-Matsuoka, Emi, Tanaka, Shigeru, Matsushita, Kohji, Okano, Hideyuki, Tsujimoto, Yoshihide, Hori, Masatsugu

JOURNAL OF NEUROSCIENCE RESEARCH 84 ( 6 ) 1187 - 1196 2006.11

Research paper (scientific journal), ISSN 0360-4012

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Musashi1 antigen expression in human fetal germinal matrix development

Chan, Charles, Moore, Brian E., Cotman, Carl W., Okano, Hideyuki, Tavares, Rosemarie, Hovanesian, Virginia, Pinar, Halit, Johanson, Conrad E., Svendsen, Clive N., Stopa, Edward G.

EXPERIMENTAL NEUROLOGY 201 ( 2 ) 515 - 518 2006.10

Research paper (scientific journal), ISSN 0014-4886

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Role of the cholinergic system in regulating survival of newborn neurons in the adult mouse dentate gyrus and olfactory bulb

Kaneko, Naoko, Okano, Hideyuki, Sawamoto, Kazunobu

GENES TO CELLS 11 ( 10 ) 1145 - 1159 2006.10

Research paper (scientific journal), ISSN 1356-9597

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Integrity of plasmid deoxyribonucleic acid after application of laser-induced stress waves used for gene transfection

Terakawa, Mitsuhiro, Sato, Shunichi, Ashida, Hiroshi, Okano, Hideyuki, Obara, Minoru

JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS & EXPRESS LETTERS 45 ( 29-32 ) L768 - L769 2006.08

Research paper (scientific journal), ISSN 0021-4922

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Ghrelin and leptin reciprocally regulate NPY neurons in the arcuate nucleus

Kohno, Daisuke, Nakata, Masanori, Maekawa, Fumihiko, Fujiwara, Ken, Kuramochi, Motoki, Shimazaki, Takuya, Okano, Hideyuki, Onaka, Tatsushi, Yada, Toshihiko

REGULATORY PEPTIDES 135 ( 3 ) 136 - 137 2006.08

Research paper (scientific journal), ISSN 0167-0115

Mapping of Notch activation during cochlear development in mice

Murata Junko, Tokunaga Akinori, Okano Hideyuki, Kubo Takeshi

Journal of Comparative Neurology 497 ( 3 ) 502 - 518 2006.07

ISSN 0021-9967

Recent chick experiments have shown that Notch signaling plays context-dependent distinct roles in inner ear development: initially, Notch activity confers a prosensory character on groups of cells by "lateral induction"; subsequently, it is involved in the establishment of fine-graded patterns of hair cells and supporting cells by "lateral inhibition." However, the spatiotemporal pattern of Notch activation in situ during mammalian inner ear development has not been investigated. In this study, we detected the expression patterns of the activated form of Notch1 (actN1) as well as those of endogenous Notch1, Jagged1 (Jag1), and Math1. ActN1 was detected by immunohistochemistry using an antibody that specifically recognizes the processed form of the intracellular domain of Notch1 cleaved by presenilin/γ-secretase activity. Between embryonic days (E)12.5 and E14.5, actN1 was weakly detected mainly in the medial region of cochlear epithelium, where Jag1-immunoreactivivty (IR) was also observed. Jag1-IR gradually became stronger in a more sharply defined area, finally becoming localized in supporting cells, while actN1 was detected in an overlapping area. Thus, a positive feedback loop was assumed to exist between the expression of Jag1 and actN1. In addition, actN1 started to be strongly expressed in the cells surrounding Math1-positive hair cell progenitors between E14.5 and E15.5. Strong actN1-IR continued in both a supporting cell lineage and in the greater epithelial ridge during the perinatal stage but ended by P7, suggesting that Notch1 activation may initially demarcate a prosensory region in the cochlear epithelium and then inhibit progenitor cells from becoming hair cells via classical "lateral inhibition." © 2006 Wiley-Liss, Inc.

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