Faculty Profiles - OUCHIDA Mamoru

Papers - OUCHIDA Mamoru

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Methylphenidate improves learning impairments and hyperthermia-induced seizures caused by an Scn1a mutation. Reviewed International journal

Iori Ohmori, Nozomi Kawakami, Sumei Liu, Haijiao Wang, Ikuko Miyazaki, Masato Asanuma, Hiroyuki Michiue, Hideki Matsui, Tomoji Mashimo, Mamoru Ouchida

Epilepsia 55 ( 10 ) 1558 - 67 2014.10

Language：English Publishing type：Research paper (scientific journal) Publisher：WILEY-BLACKWELL

ObjectiveDevelopmental disorders including cognitive deficit, hyperkinetic disorder, and autistic behaviors are frequently comorbid in epileptic patients with SCN1A mutations. However, the mechanisms underlying these developmental disorders are poorly understood and treatments are currently unavailable. Using a rodent model with an Scn1a mutation, we aimed to elucidate the pathophysiologic basis and potential therapeutic treatments for developmental disorders stemming from Scn1a mutations.
MethodsWe conducted behavioral analyses on rats with the N1417H-Scn1a mutation. With high-performance liquid chromatography, we measured dopamine and its metabolites in the frontal cortex, striatum, nucleus accumbens, and midbrain. Methylphenidate was administered intraperitoneally to examine its effects on developmental disorder-like behaviors and hyperthermia-induced seizures.
ResultsBehavioral studies revealed that Scn1a-mutant rats had repetitive behavior, hyperactivity, anxiety-like behavior, spatial learning impairments, and motor imbalance. Dopamine levels in the striatum and nucleus accumbens in Scn1a-mutant rats were significantly lower than those in wild-type rats. In Scn1a-mutant rats, methylphenidate, by increasing dopamine levels in the synaptic cleft, improved hyperactivity, anxiety-like behavior, and spatial learning impairments. Surprisingly, methylphenidate also strongly suppressed hyperthermia-induced seizures.
SignificanceDysfunction of the mesolimbic dopamine reward pathway may contribute to the hyperactivity and learning impairments in Scn1a-mutant rats. Methylphenidate was effective for treating hyperactivity, learning impairments, and hyperthermia-induced seizures. We propose that methylphenidate treatment may ameliorate not only developmental disorders but also epileptic seizures in patients with SCN1A mutations.

DOI： 10.1111/epi.12750

PROTEOMIC ANALYSIS OF INVASION- AND ANGIOGENESIS-RELATED PROTEINS IN MALIGNANT GLIOMAS Reviewed

Yu Takahashi, Tomotsugu Ichikawa, Tomoko Maruo, Kazuhiko Kurozumi, Manabu Onishi, Mamoru Ouchida, Kentaro Fuji, Yosuke Shimazu, Tetsuo Oka, E. Antonio Chiocca, Isao Date

NEURO-ONCOLOGY 15 9 - 10 2013.11

Truncated SSX protein suppresses synovial sarcoma cell proliferation by inhibiting the localization of SS18-SSX fusion protein. Reviewed International journal

Yasushi Yoneda, Sachio Ito, Toshiyuki Kunisada, Yuki Morimoto, Hirotaka Kanzaki, Aki Yoshida, Kenji Shimizu, Toshifumi Ozaki, Mamoru Ouchida

PloS one 8 ( 10 ) e77564 2013.10

Authorship：Corresponding author Language：English Publishing type：Research paper (scientific journal) Publisher：PUBLIC LIBRARY SCIENCE

Synovial sarcoma is a relatively rare high-grade soft tissue sarcoma that often develops in the limbs of young people and induces the lung and the lymph node metastasis resulting in poor prognosis. In patients with synovial sarcoma, specific chromosomal translocation of t(X; 18) (p11.2; q11.2) is observed, and SS18-SSX fusion protein expressed by this translocation is reported to be associated with pathogenesis. However, role of the fusion protein in the pathogenesis of synovial sarcoma has not yet been completely clarified. In this study, we focused on the localization patterns of SS18-SSX fusion protein. We constructed expression plasmids coding for the full length SS18-SSX, the truncated SS18 moiety (tSS18) and the truncated SSX moiety (tSSX) of SS18-SSX, tagged with fluorescent proteins. These plasmids were transfected in synovial sarcoma SYO-1 cells and we observed the expression of these proteins using a fluorescence microscope. The SS18-SSX fusion protein showed a characteristic speckle pattern in the nucleus. However, when SS18-SSX was co-expressed with tSSX, localization of SS18-SSX changed from speckle patterns to the diffused pattern similar to the localization pattern of tSSX and SSX. Furthermore, cell proliferation and colony formation of synovial sarcoma SYO-1 and YaFuSS cells were suppressed by exogenous tSSX expression. Our results suggest that the characteristic speckle localization pattern of SS18-SSX is strongly involved in the tumorigenesis through the SSX moiety of the SS18-SSX fusion protein. These findings could be applied to further understand the pathogenic mechanisms, and towards the development of molecular targeting approach for synovial sarcoma.

DOI： 10.1371/journal.pone.0077564

Inhalation of 10% carbon dioxide rapidly terminates Scn1a mutation-related hyperthermia-induced seizures Reviewed International journal

Iori Ohmori, Keiichiro Hayashi, Haijiao Wang, Mamoru Ouchida, Naohiro Fujita, Takushi Inoue, Hiroyuki Michiue, Teiichi Nishiki, Hideki Matsui

EPILEPSY RESEARCH 105 ( 1-2 ) 220 - 224 2013.7

Language：English Publishing type：Research paper (scientific journal) Publisher：ELSEVIER SCIENCE BV

The aim of this study was to assess the anticonvulsant effect of carbon dioxide (CO2) on Scn1a mutation-related febrile seizures. We examined physiological changes in the blood gas levels after the induction of hyperthermia-induced seizures (HISs), which were associated with the Scn1a missense mutation. We determined the efficacy of inhalation of 5% or 10% CO2 to treat HISs. HISs were evoked in Scn1a mutant and wild-type (WT) rats by hot water baths. To determine the anticonvulsant effect of CO2 inhalation, rats were placed in a chamber filled with air or mixed gas containing 5% CO2 or 10% CO2 for 3 min, immediately after the induction of HISs. We also analyzed the blood gas levels at the end of inhalation of CO2. Hot water bathing induced a significant reduction in the partial pressure of CO2 (pCO(2)) and respiratory alkalosis in the WT and Scn1a mutant rats. HISs were evoked in 100% of the Scn1a mutant rats within 5 min, but in none of the WT rats. The Scn1a mutant rats demonstrated a higher HISs susceptibility associated with respiratory alkalosis than the WT rats. Inhalation of 10% CO2 shortened the seizure duration from 62.6 +/- 12.1 s to 15.5 +/- 1.0 s. Blood gas analysis after the inhalation of 10% CO2 demonstrated an elevated pCO(2) level and respiratory acidosis. Inhalation of 10% CO2 demonstrated a potent and fast-acting anticonvulsant effect against HISs. (C) 2013 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.eplepsyres.2013.01.003

CACNA1A VARIANTS AS A POTENTIAL GENETIC MODIFIER OF DRAVET SYNDROME Reviewed

Ohmori, I, M. Ouchida, K. Kobayashi, Y. Ohtsuka, H. Matsui

EPILEPSIA 54 195 - 196 2013.6

Proteomics-based analysis of invasion-related proteins in malignant gliomas. Reviewed International journal

Tomoko Maruo, Tomotsugu Ichikawa, Hirotaka Kanzaki, Satoshi Inoue, Kazuhiko Kurozumi, Manabu Onishi, Koichi Yoshida, Hirokazu Kambara, Mamoru Ouchida, Kenji Shimizu, Seiji Tamaru, E Antonio Chiocca, Isao Date

Neuropathology : official journal of the Japanese Society of Neuropathology 33 ( 3 ) 264 - 75 2013.6

Language：English Publishing type：Research paper (scientific journal) Publisher：WILEY-BLACKWELL

One of the insidious biological features of gliomas is their potential to extensively invade normal brain tissue, yet molecular mechanisms that dictate this locally invasive behavior remain poorly understood. To investigate the molecular basis of invasion by malignant gliomas, proteomic analysis was performed using a pair of canine glioma subclones - J3T-1 and J3T-2 - that show different invasion phenotypes in rat brains but have similar genetic backgrounds. Two-dimensional protein electrophoresis of whole-cell lysates of J3T-1 (angiogenesis-dependent invasion phenotype) and J3T-2 (angiogenesis-independent invasion phenotype) was performed. Twenty-two distinct spots were recognized when significant alteration was defined as more than 1.5-fold change in spot intensity between J3T-1 and J3T-2. Four proteins that demonstrated increased expression in J3T-1, and 14 proteins that demonstrated increased expression in J3T-2 were identified using liquid chromatography-mass spectrometry analysis. One of the proteins identified was annexin A2, which was expressed at higher levels in J3T-1 than in J3T-2. The higher expression of annexin A2 in J3T-1 was corroborated by quantitative RT-PCR of the cultured cells and immunohistochemical staining of the rat brain tumors. Moreover, immunohistochemical analysis of human glioblastoma specimens showed that annexin A2 was expressed at high levels in the tumor cells that formed clusters around dilated vessels. These results reveal differences in the proteomic profiles between these two cell lines that might correlate with their different invasion profiles. Thus, annexin A2 may be related to angiogenesis-dependent invasion.

DOI： 10.1111/j.1440-1789.2012.01361.x

INHALATION OF CO2 SHOWS A POTENT AND FAST-ACTING ANTICONVULSANT EFFECT AGAINST SCN1A MUTATION-RELATED HYPERTHERMIA-INDUCED SEIZURES Reviewed

Ohmori, I, K. Hayashi, H. Wang, M. Ouchida, H. Matsui

EPILEPSIA 54 49 - 49 2013.6

CACNA1A variants may modify the epileptic phenotype of Dravet syndrome Reviewed International journal

Iori Ohmori, Mamoru Ouchida, Katsuhiro Kobayashi, Yoshimi Jitsumori, Akiko Mori, Hiroyuki Michiue, Teiichi Nishiki, Yoko Ohtsuka, Hideki Matsui

NEUROBIOLOGY OF DISEASE 50 209 - 217 2013.2

Language：English Publishing type：Research paper (scientific journal) Publisher：ACADEMIC PRESS INC ELSEVIER SCIENCE

Dravet syndrome is an intractable epileptic syndrome beginning in the first year of life. De novo mutations of SCN1A, which encode the Na(v)1.1 neuronal voltage-gated sodium channel, are considered the major cause of Dravet syndrome. In this study, we investigated genetic modifiers of this syndrome.
We performed a mutational analysis of all coding exons of CACNA1A in 48 subjects with Dravet syndrome. To assess the effects of CACNA1A variants on the epileptic phenotypes of Dravet syndrome, we compared clinical features in two genotype groups: 1) subjects harboring SCN1A mutations but no CACNA1A variants (n = 20) and 2) subjects with SCN1A mutations plus CACNA1A variants (n = 20). CACNA1A variants detected in patients were studied using heterologous expression of recombinant human Ca(v)2.1 in HEK 293 cells and whole-cell patch-clamp recording.
Nine CACNA1A variants, including six novel ones, were detected in 21 of the 48 subjects (43.8%). Based on the incidence of variants in healthy controls, most of the variants seemed to be common polymorphisms. However, the subjects harboring SCN1A mutations and CACNA1A variants had absence seizures more frequently than the patients with only SCN1A mutations (8/20 vs. 0/20, p = 0.002). Moreover, the former group of subjects exhibited earlier onset of seizures and more frequent prolonged seizures before one year of age, compared to the latter group of subjects. The electrophysiological properties of four of the five novel Ca(v)2.1 variants exhibited biophysical changes consistent with gain-of-function. We conclude that CACNA1A variants in some persons with Dravet syndrome may modify the epileptic phenotypes. (C) 2012 Elsevier Inc. All rights reserved.

DOI： 10.1016/j.nbd.2012.10.016

High-frequency EEG oscillations in hyperthermia-induced seizures of Scn1a mutant rats. Reviewed International journal

Katsuhiro Kobayashi, Iori Ohmori, Keiichiro Hayashi, Yuichiro Kitagawa, Mamoru Ouchida, Takushi Inoue, Yoko Ohtsuka

Epilepsy research 103 ( 2-3 ) 161 - 6 2013.2

Language：English Publishing type：Research paper (scientific journal) Publisher：ELSEVIER SCIENCE BV

We examined high-frequency oscillations (HFOs) in the ictal cortical EEGs of hyperthermia-induced seizures in a rat model of febrile seizures with an SCN1A mutation as a means of investigating the pathophysiological mechanisms underlying the generation of febrile seizures. We used 13 male homozygous Scn1a-N1417H mutant rats (F344/NSlc-Scn1a(Kyo811)) and 10 wild-type control rats.
Generalized tonic-clonic seizures were induced in all mutant rats, and HFOs with frequencies ranging from 200 to 400 Hz were found to precede spikes during the clonic phases of these seizures in the ictal EEGs. The proportion of all spikes in each seizure that were associated with HFOs increased with age. In time-frequency spectra of the EEG data, the HFOs had a mean peak frequency of 301.1 +/- 65.4 Hz (range: 156.3-468.8 Hz) and a mean peak power of 24.6 +/- 3.8 dB (range: 11.4-33.4 dB); the peak power increased with age. Regarding the wild-type rats, a brief seizure without unmistakable HFOs was exceptionally induced in only one rat.
The generation mechanism of febrile seizures is still an unanswered question. The detection of HFOs from the ictal EEGs of hyperthermia-induced seizures may provide a cue to answering this open question, although in this research we were unable to provide sufficient evidence to prove that the generation of HFOs depended on the mutation. (C) 2012 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.eplepsyres.2012.07.020

Spinal nerve injury causes upregulation of ErbB2 and ErbB3 receptors in rat dorsal root ganglia. Reviewed International journal

Satoshi Mizobuchi, Hirotaka Kanzaki, Hiroki Omiya, Yoshikazu Matsuoka, Norihiko Obata, Ryuji Kaku, Hirochika Nakajima, Mamoru Ouchida, Kiyoshi Morita

Journal of pain research 6 87 - 94 2013

Language：English Publishing type：Research paper (scientific journal)

It is generally known that peripheral nerve injury causes changes in expression of some growth factors in the dorsal root ganglion. Altered expression of ErbB receptors, a well-known growth factor in somatic cells, reportedly follows peripheral nerve injury in the spinal dorsal horn; however, it remains unknown whether the expression of these receptors is altered in the dorsal root ganglion after nerve injury. Therefore, this study examined the gene expression profiles of ErbB receptors in bilateral lumbar (L)4/L5 dorsal root ganglia, using L5-selective spinal nerve ligation in model rats as a peripheral nerve injury model. The expression of ErbB2 and ErbB3 was observed in the dorsal root ganglia of the mature rat, despite ErbB1 and ErbB4 showing only subtle expression. We also demonstrated that peripheral nerve injury induced significant increases in ErbB2 and ErbB3 in the ipsilateral dorsal root ganglion as compared with uninjured nerve. Expression changes in ErbB receptors appear to play important roles in nerve injury and subsequent nerve regeneration.

DOI： 10.2147/JPR.S40967

MicroRNA-21 correlates with tumorigenesis in malignant peripheral nerve sheath tumor (MPNST) via programmed cell death protein 4 (PDCD4) Reviewed International journal

Satoru Itani, Toshiyuki Kunisada, Yuki Morimoto, Aki Yoshida, Tsuyoshi Sasaki, Sachio Ito, Mamoru Ouchida, Shinsuke Sugihara, Kenji Shimizu, Toshifumi Ozaki

JOURNAL OF CANCER RESEARCH AND CLINICAL ONCOLOGY 138 ( 9 ) 1501 - 1509 2012.9

Language：English Publishing type：Research paper (scientific journal) Publisher：SPRINGER

We investigated the miRNA profile in peripheral nerve tumors and clarified the involvement of miRNA in the development and progression of MPNST in comparison with neurofibroma (NF). In addition, we attempted to seek associations between the miRNA and their potential targets in MPNST.
Global miRNA expression profiling was investigated for clinical samples of 6 MPNSTs and 6 NFs. As detected by profiling analysis, the expressions of miR-21 in clinical samples of 12 MPNSTs, 11 NFs, and 5 normal nerves, and 3 MPNST cell lines were compared using quantitative real-time reverse transcription PCR. MPNST cell line (YST-1) was transfected with miR-21 inhibitor to study its effects on cell proliferation, caspase activity, and the expression of miR-21 targets.
Analysis of miRNA expression profiles in MPNST and NF revealed significantly altered expression levels of nine miRNAs, one of those, miR-21, and its putative target, programmed cell death protein 4 (PDCD4), were selected for further studies. miR-21 expression level in MPNST was significantly higher than that in NF (P < 0.05). In MPNST cells, transfection of miR-21 inhibitor significantly increased caspase activity (P < 0.01), significantly suppressed cell growth (P < 0.05), and upregulated protein level of PDCD4, indicating that miR-21 inhibitor could induce cell apoptosis of MPNST cells.
These results suggest that miR-21 plays an important role in MPNST tumorigenesis and progression through its target, PDCD4. MiR-21 and PDCD4 may be candidate novel therapeutic targets against the development or progression of MPNSTs.

DOI： 10.1007/s00432-012-1223-1

Novel direct targets of miR-19a identified in breast cancer cells by a quantitative proteomic approach. Reviewed International journal

Mamoru Ouchida, Hirotaka Kanzaki, Sachio Ito, Hiroko Hanafusa, Yoshimi Jitsumori, Seiji Tamaru, Kenji Shimizu

PloS one 7 ( 8 ) e44095 2012.8

Authorship：Lead author,　Corresponding author Language：English Publishing type：Research paper (scientific journal) Publisher：PUBLIC LIBRARY SCIENCE

The miR-17-92 cluster encodes 7 miRNAs inside a single polycistronic transcript, and is known as a group of oncogenic miRNAs that contribute to tumorigenesis in several cancers. However, their direct targets remain unclear, and it has been suggested that a single miRNA is capable of reducing the production of hundreds of proteins. The majority of reports on the identification of miRNA targets are based on computational approaches or the detection of altered mRNA levels, despite the fact that most miRNAs are thought to regulate their targets primarily by translational inhibition in higher organisms. In this study, we examined the target profiles of miR-19a, miR-20a and miR-92-1 in MCF-7 breast cancer cells by a quantitative proteomic strategy to identify their direct targets. A total of 123 proteins were significantly increased after the endogenous miR-19a, miR-20a and miR-92-1 were knocked down, and were identified as potential targets by two-dimensional electrophoresis and a mass spectrometric analysis. Among the upregulated proteins, four (PPP2R2A, ARHGAP1, IMPDH1 and NPEPL1) were shown to have miR-19a or miR-20a binding sites on their mRNAs. The luciferase activity of the plasmids with each binding site was observed to decrease, and an increased luciferase activity was observed in the presence of the specific anti-miRNA-LNA. A Western blot analysis showed the expression levels of IMPDH1 and NPEPL1 to increase after treatment with anti-miR-19a, while the expression levels of PPP2R2A and ARHGAP1 did not change. The expression levels of IMPDH1 and NPEPL1 did not significantly change by anti-miR-19a-LNA at the mRNA level. These results suggest that the IMPDH1 and NPEPL1 genes are direct targets of miR-19a in breast cancer, while the exogenous expression of these genes is not associated with the growth suppression of MCF-7 cells. Furthermore, our proteomic approaches were shown to be valuable for identifying direct miRNA targets.

DOI： 10.1371/journal.pone.0044095

Genetic risk of hepatocellular carcinoma in patients with hepatitis C virus: A case control study Reviewed International journal

Takeshi Tomoda, Kazuhiro Nouso, Akiko Sakai, Mamoru Ouchida, Sayo Kobayashi, Koji Miyahara, Hideki Onishi, Shinichiro Nakamura, Kazuhide Yamamoto, Kenji Shimizu

JOURNAL OF GASTROENTEROLOGY AND HEPATOLOGY 27 ( 4 ) 797 - 804 2012.4

Language：English Publishing type：Research paper (scientific journal) Publisher：WILEY-BLACKWELL

Backgroud and Aim: Chronic hepatitis C virus (HCV) infection is a well known risk factor for hepatocellular carcinoma (HCC). The aim of this study is to elucidate the genetic risk of development and recurrence of HCC in patients with HCV.
Methods: A total of 468 patients with HCV, including 265 with HCC were enrolled. We genotyped 88 single nucleotide polymorphisms (SNPs) in 81 genes expected to influence hepatocarcinogenesis using the iPLEX assay. Risk of HCC was clarified by stratifying patients into risk groups based on the multiplied odds ratio (MOR) for SNPs associated with HCC, and the cumulative effects on the development and recurrence of HCC were analyzed.
Results: Six SNPs associated with risk of HCC were identified (OR range: 0.29-1.76). These included novel SNPs for hepatocarcinogenesis with HCV CCND2 rs1049606, RAD23B rs1805329, CEP164 rs573455, and GRP78rs430397 in addition to the known SNPs MDM2 rs2279744 and ALDH2 rs671. MOR analysis revealed that the highest risk group exerted about a 19-fold higher relative OR compared with the lowest risk group (P = 1.08 x 10(-5)). Predicted 10-year HCC risk ranged from 1.7% to 96% depending on the risk group and the extent of fibrosis. Recurrence-free survival of radiofrequency ablation-treated HCC in the high risk group (n = 53) was lower than that of low risk group (n = 58, P = 0.038).
Conclusion: Single nucleotide polymorphisms of CCND2, RAD23B, GRP78, CEP164, MDM2, and ALDH2 genes were significantly associated with development and recurrence of HCC in Japanese patients with HCV.

DOI： 10.1111/j.1440-1746.2011.06948.x

Different Responses to 5-fluoraouracil in Mutagenicity and Gene Expression between Two Human Lymphoblastoid Cell Lines with or without TP53 Mutation Reviewed

Hiroaki Oka, Mamoru Ouchida, Takuya Kondo, Fumio Morita, Kenji Shimizu

ACTA MEDICA OKAYAMA 66 ( 2 ) 119 - 129 2012.4

Language：English Publishing type：Research paper (scientific journal) Publisher：OKAYAMA UNIV MED SCHOOL

Human lymphoblastoid TK6 and WTK-1 cells are widely used to detect mutagens in vitro. TK6 cells have wild-type TP53 alleles, while WTK-1 cells have one allele of mutated TP53. Both cells were treated with 5-fluorouracil (5-FU), and gene mutation assay and micronucleus assay were performed to clarify the differential response related to the TP53 gene status. The effects of 5-FU on gene expression were assessed by microarray and quantitative RT-PCR analyses. In WTK-1 cells, 5-FU increased the frequency of cells with micronucleus and mutation. In TK6 cells, frequency of cells with micronucleus was increased but the mutation frequency was not. The cytotoxicity induced by 5-FU was more prominent in TK6 cells than in WTK-1 cells. Analysis of gene expression showed that the genes involved in the TP53 pathway were up-regulated in TK6 cells but not in WTK-1 cells. The differential responses to 5-FU between these cell lines appeared to be due to the difference in the TP53 gene status, thus providing a molecular basis for the bioassays using these cell lines in the toxicology field. Our results indicate that the clinical efficacy of 5-FU chemotherapy may depend on the TP53 genotype.

Expression changes of the neuregulin 1 isoforms in neuropathic pain model rats. Reviewed International journal

Kanzaki H, Mizobuchi S, Obata N, Itano Y, Kaku R, Tomotsuka N, Nakajima H, Ouchida M, Nakatsuka H, Maeshima K, Morita K

Neuroscience letters 508 ( 2 ) 78 - 83 2012.2

Language：English Publishing type：Research paper (scientific journal) Publisher：2

The neuregulin1 (Nrg1) gene that is expressed in the dorsal root ganglion (DRG) contains an EGF-like domain, which is known to be a direct ligand for ErbB3 and ErbB4. Multiple splice variants of the Nrg1 gene are broadly classified into 3 groups by structural features (type I, type II and type III) and their functions differ in various tissues. The Nrg1 gene has emerged as a key mediator of axon-Schwann cell interactions and as a regulator of Schwann cell development. The Nrg1 gene is indicated as a promising growth factor for neuronal development. However, the function of the Nrg1 in pain has not been clarified. We therefore, examined the expression profiles of each type of the Nrg1 transcript in the bilateral L4/L5 DRGs using L5 spinal nerve ligation (SNL) model rats and complete Freund's adjuvant (CFA) model rats. Behavior tests have shown typical mechanical hyperalgesia in both the L5SNL model and the CFA model. In the L5SNL model, expression of the Nrg1 type I and type II were significantly increased in the L5 DRG. On the other hand, the expression of the Nrg1 type III was decreased in the L5 DRG. We demonstrated that the expression changes of the Nrg1 isoforms in the ipsilateral DRGs were preferentially related to the response to nerve injury. Our findings suggest that the aberrant expression may play an important role in nerve injury, regeneration and subsequent neuropathic pain on the L5SNL.

DOI： 10.1016/j.neulet.2011.12.023

Eradication of hepatitis C virus subgenomic replicon by interferon results in aberrant retinol-related protein expression. Reviewed

Kazuko Koike, Akinobu Takaki, Nobuyuki Kato, Mamoru Ouchida, Hirotaka Kanzaki, Tetsuya Yasunaka, Hidenori Shiraha, Yasuhiro Miyake, Kazuhide Yamamoto

Acta medica Okayama 66 ( 6 ) 461 - 8 2012

Language：English Publishing type：Research paper (scientific journal)

Hepatitis C virus (HCV) infection induces several changes in hepatocytes, such as oxidative stress, steatosis, and hepatocarcinogenesis. Although considerable progress has been made during recent years, the mechanisms underlying these functions remain unclear. We employed proteomic techniques in HCV replicon-harboring cells to determine the effects of HCV replication on host-cell protein expression. We examined two-dimensional electrophoresis (2-DE) and mass spectrometry to compare and identify differentially expressed proteins between HCV subgenomic replicon-harboring cells and their "cured" cells. One of the identified proteins was confirmed using enzyme-linked immunosorbent assay (ELISA) and Western blot analysis. Full-length HCV genome RNA replicating and cured cells were also assessed using ELISA. Replicon-harboring cells showed higher expression of retinal dehydrogenase 1 (RALDH-1), which converts retinol to retinoic acid, and the cured cells showed higher expression of retinol-binding protein (RBP), which transports retinol from the liver to target tissues. The alteration in RBP expression was also confirmed by ELISA and Western blot analysis. We conclude that protein expression profiling demonstrated that HCV replicon eradication affected retinol-related protein expression.

DOI： 10.18926/AMO/49042

Antinociceptive effects of intrathecal landiolol injection in a rat formalin pain model. Reviewed

Satoshi Mizobuchi, Yoshikazu Matsuoka, Norihiko Obata, Ryuji Kaku, Yoshitaro Itano, Naoto Tomotsuka, Arata Taniguchi, Hiroyuki Nishie, Hirotaka Kanzaki, Mamoru Ouchida, Kiyoshi Morita

Acta medica Okayama 66 ( 3 ) 285 - 9 2012

Language：English Publishing type：Research paper (scientific journal)

Perioperative beta-blocker administration has recently been recommended for patients undergoing cardiac or other surgery due to the beneficial cardiovascular effects of these agents. In addition, some studies have reported that perioperatively administered beta-blockers also have analgesic effects. In this study, to investigate the antinociceptive effects and the analgesic profile of landiolol, we examined the effects of intrathecal landiolol administration on nociceptive pain behavior and c-fos mRNA expression (a neural marker of pain) in the spinal cord using a rat formalin model. We found that pain-related behavior was inhibited by intrathecal landiolol administration. Moreover, the increase in c-fos mRNA expression on the formalin-injected side was less pronounced in rats administered landiolol than in saline administered controls. Thus, intrathecal administration of landiolol exhibited antinociceptive effects. Further investigation of the antinociceptive mechanism of landiolol is required.

DOI： 10.18926/AMO/48569

DNA repair/replication gene polymorphism and gastroenterological cancer risk Reviewed

T. Sonoyama, H. Kato, A. Sakai, Y. Yasuda, M. Ouchida, K. Yamamoto, K. Shimizu

JOURNAL OF GASTROENTEROLOGY AND HEPATOLOGY 26 225 - 225 2011.10

Dravet syndrome with an exceptionally good seizure outcome in two adolescents Reviewed International journal

Katsuhiro Kobayashi, Iori Ohmori, Mamoru Ouchida, Yoko Ohtsuka

EPILEPTIC DISORDERS 13 ( 3 ) 340 - 344 2011.9

Language：English Publishing type：Research paper (scientific journal) Publisher：JOHN LIBBEY EUROTEXT LTD

We present two children who exhibited the characteristics of Dravet syndrome during infancy and young childhood, with SCN1A mutation, but nevertheless achieved seizure freedom for at least four years during adolescence. These patients had no episodes of convulsive status epilepticus with a duration of more than 30 minutes and their overall favourable seizure outcome may be related to the prevention of convulsive status epilepticus.

DOI： 10.1684/epd.2011.0453

Identification of direct targets for the miR-17-92 cluster by proteomic analysis Reviewed International journal

Hirotaka Kanzaki, Sachio Ito, Hiroko Hanafusa, Yoshimi Jitsumori, Seiji Tamaru, Kenji Shimizu, Mamoru Ouchida

PROTEOMICS 11 ( 17 ) 3531 - 3539 2011.9

Authorship：Corresponding author Language：English Publishing type：Research paper (scientific journal) Publisher：WILEY

MicroRNAs (miRNAs) are small non-coding RNAs that post-transcriptionally repress the expression of target genes. Many miRNAs have been implicated in a number of diseases, including cancers. The miR-17-92 miRNA cluster is known as a body of oncogenic miRNAs, and has been shown to be overexpressed in several cancers, including lung cancer. Although the overexpression of miR-17-92 is clearly implicated in the development of lung cancer, only a few direct targets for the miR-17-92 cluster have been identified thus far. In this study, we examined miR-17-92 target profiles in SBC-3 small-cell lung cancer cells using a quantitative proteomic strategy to identify direct targets of the miR-17-92 cluster. By knocking down the expression of endogenous miR-19a, miR-20a and miR-92-1, which are contained in the cluster, 112 up-regulated proteins were detected and also identified as potential targets of these miRNAs. Among these candidate targets, we validated one direct target, RAB14. In conclusion, these findings suggest that proteomic approaches are valuable for identifying direct miRNA targets, and we were able to identify a novel direct target for the miR-92-1 using our proteomic strategy.

DOI： 10.1002/pmic.201000501

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