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Taoka R, Kamada M, Izumi K, Tanimoto R, Daizumoto K, Hayashida Y, Uematsu K, Arai H, Sano T, Saito R, Hirama H, Kobayashi T, Honda T, Osaki Y, Abe Y, Naito H, Tohi Y, Matsuoka Y, Kato T, Okazoe H, Ueda N, Sugimoto M. Peripheral neuropathy and nerve electrophysiological changes with enfortumab vedotin in patients with advanced urothelial carcinoma: a prospective multicenter cohort study. Int J Clin Oncol 2024; 29:602-611. [PMID: 38418804 DOI: 10.1007/s10147-024-02481-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2023] [Accepted: 01/22/2024] [Indexed: 03/02/2024]
Abstract
BACKGROUND Enfortumab vedotin is a novel antibody-drug conjugate used as a third-line therapy for the treatment of urothelial cancer. We aimed to elucidate the effect of enfortumab vedotin-related peripheral neuropathy on its efficacy and whether enfortumab vedotin-induced early electrophysiological changes could be associated with peripheral neuropathy onset. METHODS Our prospective multicenter cohort study enrolled 34 patients with prior platinum-containing chemotherapy and programmed cell death protein 1/ligand 1 inhibitor-resistant advanced urothelial carcinoma and received enfortumab vedotin. The best overall response, progression-free survival, overall survival, and safety were assessed. Nerve conduction studies were also performed in 11 patients. RESULTS The confirmed overall response rate and disease control rate were 52.9% and 73.5%, respectively. The median overall progression-free survival and overall survival were 6.9 and 13.5 months, respectively, during a median follow-up of 8.6 months. The patients with disease control had significantly longer treatment continuation and overall survival than did those with uncontrolled disease. Peripheral neuropathy occurred in 12.5% of the patients. The overall response and disease control rates were 83.3% and 100%, respectively: higher than those in patients without peripheral neuropathy (p = 0.028 and p = 0.029, respectively). Nerve conduction studies indicated that enfortumab vedotin reduced nerve conduction velocity more markedly in sensory nerves than in motor nerves and the lower limbs than in the upper limbs, with the sural nerve being the most affected in the patients who developed peripheral neuropathy (p = 0.011). CONCLUSION Our results indicated the importance of focusing on enfortumab vedotin-induced neuropathy of the sural nerve to maximize efficacy and improve safety.
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Affiliation(s)
- Rikiya Taoka
- Department of Urology, Faculty of Medicine, Kagawa University, 1750-1, Ikenobe, Miki-cho, Kita-gun, Kagawa, Japan.
| | - Masaki Kamada
- Department of Neurological Intractable Disease Research, Kagawa University School of Medicine, Kita, Japan
| | - Kazuyoshi Izumi
- Department of Urology, Takamatsu Red Cross Hospital, Takamatsu, Japan
| | - Ryuta Tanimoto
- Department of Urology, Kagawa Prefectural Central Hospital, Takamatsu, Japan
| | - Kei Daizumoto
- Department of Urology, Tokushima University Graduate School of Biomedical Sciences, Tokushima, Japan
| | - Yushi Hayashida
- Department of Urology, Sakaide City Hospital, Sakaide, Japan
| | | | - Hironobu Arai
- Department of Urology, Shodoshima Central Hospital, Shodoshima, Japan
| | - Takeshi Sano
- Department of Urology, Kansai Medical University, Hirakata, Japan
| | - Ryoichi Saito
- Department of Urology, Kyoto University Graduate School of Medicine, Kyoto, Japan
| | - Hiromi Hirama
- Department of Urology, KKR Takamatsu Hospital, Takamatsu, Japan
| | - Toshihiro Kobayashi
- Department of Endocrinology and Metabolism, Faculty of Medicine, Kagawa University, Kita, Japan
| | - Tomoko Honda
- Department of Urology, Faculty of Medicine, Kagawa University, 1750-1, Ikenobe, Miki-cho, Kita-gun, Kagawa, Japan
| | - Yu Osaki
- Department of Urology, Faculty of Medicine, Kagawa University, 1750-1, Ikenobe, Miki-cho, Kita-gun, Kagawa, Japan
| | - Yohei Abe
- Department of Urology, Faculty of Medicine, Kagawa University, 1750-1, Ikenobe, Miki-cho, Kita-gun, Kagawa, Japan
| | - Hirohito Naito
- Department of Urology, Faculty of Medicine, Kagawa University, 1750-1, Ikenobe, Miki-cho, Kita-gun, Kagawa, Japan
| | - Yoichiro Tohi
- Department of Urology, Faculty of Medicine, Kagawa University, 1750-1, Ikenobe, Miki-cho, Kita-gun, Kagawa, Japan
| | - Yuki Matsuoka
- Department of Urology, Faculty of Medicine, Kagawa University, 1750-1, Ikenobe, Miki-cho, Kita-gun, Kagawa, Japan
| | - Takuma Kato
- Department of Urology, Faculty of Medicine, Kagawa University, 1750-1, Ikenobe, Miki-cho, Kita-gun, Kagawa, Japan
| | - Homare Okazoe
- Department of Urology, Faculty of Medicine, Kagawa University, 1750-1, Ikenobe, Miki-cho, Kita-gun, Kagawa, Japan
| | - Nobufumi Ueda
- Department of Urology, Faculty of Medicine, Kagawa University, 1750-1, Ikenobe, Miki-cho, Kita-gun, Kagawa, Japan
| | - Mikio Sugimoto
- Department of Urology, Faculty of Medicine, Kagawa University, 1750-1, Ikenobe, Miki-cho, Kita-gun, Kagawa, Japan
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Nonaka W, Takata T, Iwama H, Komatsubara S, Kobara H, Kamada M, Deguchi K, Touge T, Miyamoto O, Nakamura T, Itano T, Masaki T. A cerebrospinal fluid microRNA analysis: Progressive supranuclear palsy. Mol Med Rep 2022; 25:88. [PMID: 35039873 PMCID: PMC8809115 DOI: 10.3892/mmr.2022.12604] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2021] [Accepted: 12/07/2021] [Indexed: 12/20/2022] Open
Abstract
Progressive supranuclear palsy (PSP) is a neurodegenerative tauopathy described as a syndrome of postural instability, supranuclear vertical gaze palsy, dysarthria, dystonic rigidity of the neck and trunk, dementia, and pseudobulbar palsy. The clinical diagnosis of PSP is often difficult because there are no established biomarkers, and diagnosis is currently based on clinical and imaging findings. Furthermore, the etiology and pathogenesis of PSP remain unknown. Dysregulation of microRNAs (miRNAs/miRs) has been reported to serve an important role in neurodegenerative diseases. However, the miRNA profiles of patients with PSP are rarely reported. The present study aimed to examine cerebrospinal fluid miRNAs, which are considered to be more sensitive indicators of changes in the brain, to elucidate the pathophysiology of PSP and to establish specific biomarkers for diagnosis. The present study used a microarray chip containing 2,632 miRNAs to examine cerebrospinal fluid miRNA expression levels in 11 patients with PSP aged 68–82 years. A total of 8 age- and sex-matched controls were also included. A total of 38 miRNAs were significantly upregulated and one miRNA was significantly downregulated in the cerebrospinal fluid of patients with PSP. The patients were divided into two groups based on disease stage (early onset and advanced), and changes in miRNA expression were examined. The miRNAs that were most significantly upregulated or downregulated in the early onset group were miR-204-3p, miR-873-3p and miR-6840-5p. The target genes of these miRNAs were associated with molecules related to the ubiquitin-proteasome system and autophagy pathway. Furthermore, these miRNAs were found to target genes that have been reported to have epigenetic changes following an epigenome-wide association study of brain tissues of patients with PSP. This suggested that these miRNAs and genes may have some involvement in the pathogenesis of PSP. However, the sample size of the present study was small; therefore, a greater number of patients with PSP should be examined in future studies.
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Affiliation(s)
- Wakako Nonaka
- Department of Neurology, Faculty of Medicine, Kagawa University, Miki‑Cho, Kagawa 761‑0793, Japan
| | - Tadayuki Takata
- Department of Neurology, Faculty of Medicine, Kagawa University, Miki‑Cho, Kagawa 761‑0793, Japan
| | - Hisakazu Iwama
- Life Science Research Center, Kagawa University, Miki‑Cho, Kagawa 761‑0793, Japan
| | - Satoshi Komatsubara
- Department of Orthopedic Surgery, Faculty of Medicine, Kagawa University, Miki‑Cho, Kagawa 761‑0793, Japan
| | - Hideki Kobara
- Department of Gastroenterology, Faculty of Medicine, Kagawa University, Miki‑Cho, Kagawa 761‑0793, Japan
| | - Masaki Kamada
- Department of Neurology, Faculty of Medicine, Kagawa University, Miki‑Cho, Kagawa 761‑0793, Japan
| | - Kazushi Deguchi
- Department of Neurology, Faculty of Medicine, Kagawa University, Miki‑Cho, Kagawa 761‑0793, Japan
| | - Tetsuo Touge
- Department of Health Sciences, Faculty of Medicine, Kagawa University, Miki‑Cho, Kagawa 761‑0793, Japan
| | - Osamu Miyamoto
- Department of Medical Engineering, Faculty of Health Science and Technology, Kawasaki University of Medical Welfare, Kurashiki, Okayama 701‑0193, Japan
| | - Takehiro Nakamura
- Department of Physiology 2, Kawasaki Medical School, Kurashiki, Okayama 701‑0192, Japan
| | - Toshifumi Itano
- Department of Neurology, Faculty of Medicine, Kagawa University, Miki‑Cho, Kagawa 761‑0793, Japan
| | - Tsutomu Masaki
- Department of Gastroenterology, Faculty of Medicine, Kagawa University, Miki‑Cho, Kagawa 761‑0793, Japan
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Kume K, Kamada M, Shimatani Y, Takata T, Izumi Y, Kawakami H. Novel monoallelic variant in ERLIN2 causes spastic paraplegia converted to amyotrophic lateral sclerosis. J Neurol Sci 2021; 430:119984. [PMID: 34536826 DOI: 10.1016/j.jns.2021.119984] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2021] [Revised: 09/04/2021] [Accepted: 09/12/2021] [Indexed: 11/26/2022]
Affiliation(s)
- Kodai Kume
- Department of Epidemiology, Research Institute for Radiation Biology and Medicine, Hiroshima University, Hiroshima, Japan.
| | - Masaki Kamada
- Department of Intractable Neurological Research, Faculty of Medicine, Kagawa University, Miki, Japan
| | - Yoshimitsu Shimatani
- Department of Neurology, Graduate School of Biomedical Sciences, Tokushima University, Tokushima, Japan; Department of Neurology, Tokushima Prefectural Central Hospital, Tokushima, Japan
| | - Tadayuki Takata
- Department of Supportive and Promotive Medicine of the Municipal Hospital, Faculty of Medicine, Kagawa University, Miki, Japan
| | - Yuishin Izumi
- Department of Neurology, Graduate School of Biomedical Sciences, Tokushima University, Tokushima, Japan
| | - Hideshi Kawakami
- Department of Epidemiology, Research Institute for Radiation Biology and Medicine, Hiroshima University, Hiroshima, Japan
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Kokudo Y, Arakawa T, Takahashi H, Kobara H, Kamada M, Deguchi K, Touge T, Masaki T, Yamamoto T. Ascending spinal tract formation in chick embryo originating from different spinal regions. Brain Res 2021; 1768:147595. [PMID: 34332964 DOI: 10.1016/j.brainres.2021.147595] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2020] [Revised: 07/22/2021] [Accepted: 07/25/2021] [Indexed: 11/18/2022]
Abstract
The present study aimed to assess spinal tract formation in neurons originating from cervical (C7), brachial (C14), and thoracic (T4) regions, with the lumbar (LS2) region as a reference, in a chick embryo. For the assessment of the spinal tracts, we introduced a vector expressing human placental alkaline phosphatase into progenitor cells generated after neural tube closure and belonging to the above segments, using in ovo electroporation. The ascending axons took primarily similar paths: dorsal commissural, ventral commissural, and dorsal non-commissural paths, with some variance depending on their originating segments. Some populations of non-commissural neurons later extended their axons following a ventral path. The elongation rates of these axons are primarily constant and tended to increase over time; however, some variations depending on the originating segments were also observed. Some of the dorsally ascending axons entered into the developing cerebellum, and spinocerebellar neurons originating from T4 projected their axons into the cortex of the cerebellum differently from those from LS2. These results unveil an overall picture of early ascending spinal tract formation.
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Affiliation(s)
- Yohei Kokudo
- Department of Neurological Intractable Disease Research, Faculty of Medicine, Kagawa University, Kagawa 761-0793, Japan
| | - Takahiro Arakawa
- Department of Molecular Neurobiology, Faculty of Medicine, Kagawa University, 761-0793, Japan
| | - Hiroo Takahashi
- Department of Molecular Neurobiology, Faculty of Medicine, Kagawa University, 761-0793, Japan
| | - Hideki Kobara
- Department of Gastroenterology and Neurology, Faculty of Medicine, Kagawa University, Kagawa 761-0793, Japan
| | - Masaki Kamada
- Department of Neurological Intractable Disease Research, Faculty of Medicine, Kagawa University, Kagawa 761-0793, Japan
| | - Kazushi Deguchi
- Department of Gastroenterology and Neurology, Faculty of Medicine, Kagawa University, Kagawa 761-0793, Japan
| | - Tetsuo Touge
- Department of Gastroenterology and Neurology, Faculty of Medicine, Kagawa University, Kagawa 761-0793, Japan
| | - Tsutomu Masaki
- Department of Gastroenterology and Neurology, Faculty of Medicine, Kagawa University, Kagawa 761-0793, Japan
| | - Tohru Yamamoto
- Department of Molecular Neurobiology, Faculty of Medicine, Kagawa University, 761-0793, Japan.
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Chiba Y, Takata T, Hamada Y, Nonaka W, Kokudo Y, Kobara H, Kamada M, Deguchi K, Touge T, Masaki T. Be Wary of Lower Leg Edema in Parkinson Disease! Am J Med 2021; 134:e295-e296. [PMID: 33217371 DOI: 10.1016/j.amjmed.2020.09.059] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/17/2020] [Revised: 09/23/2020] [Accepted: 09/24/2020] [Indexed: 11/16/2022]
Affiliation(s)
- Yuta Chiba
- Department of Neurology, Kagawa University Faculty of Medicine, Miki, Japan
| | - Tadayuki Takata
- Department of Neurology, Kagawa University Faculty of Medicine, Miki, Japan; Department of General Internal Medicine, Kagawa University Faculty of Medicine, Miki, Japan.
| | - Yasuhiro Hamada
- Department of Neurology, Kagawa University Faculty of Medicine, Miki, Japan
| | - Wakako Nonaka
- Department of Neurology, Kagawa University Faculty of Medicine, Miki, Japan
| | - Yohei Kokudo
- Department of Intractable Neurological Research, Kagawa University, Faculty of Medicine, Miki, Japan
| | - Hideki Kobara
- Department of Gastroenterology, Kagawa University Faculty of Medicine, Miki, Japan
| | - Masaki Kamada
- Department of Intractable Neurological Research, Kagawa University, Faculty of Medicine, Miki, Japan
| | - Kazushi Deguchi
- Department of Neurology, Kagawa University Faculty of Medicine, Miki, Japan
| | - Tetsuo Touge
- Department of Health Sciences, Kagawa University Faculty of Medicine, Miki, Japan
| | - Tsutomu Masaki
- Department of Gastroenterology, Kagawa University Faculty of Medicine, Miki, Japan
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Kanaya Y, Kume K, Morino H, Ohsawa R, Kurashige T, Kamada M, Torii T, Izumi Y, Maruyama H, Kawakami H. Analysis of genetic risk factors in Japanese patients with Parkinson's disease. J Hum Genet 2021; 66:957-964. [PMID: 33742109 DOI: 10.1038/s10038-021-00910-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2020] [Revised: 02/06/2021] [Accepted: 02/08/2021] [Indexed: 11/09/2022]
Abstract
Parkinson's disease (PD) is caused by a combination of genetic and environmental factors. Notably, genetic risk factors vary according to ethnicity and geographical regions, and few studies have analyzed the frequency of PD causative genes in Japanese patients. Therefore, we performed genetic analyses of Japanese patients with PD. We recruited 221 participants, including 26 patients with familial PD. Genetic risk factors were evaluated by target sequencing and gene dosage analysis. We detected the genetic risk factors in 58 cases (26.2%) and classified patients into three groups to clarify the differences in genetic risk factors by age at onset (AAO). The early-onset group (AAO < 50 years) included 18 cases (44.7%), who tended to have a larger number of genetic risk factors than the later-onset groups. Regarding the AAO for each causative gene, patients with PRKN variants were significantly younger at onset than those bearing LRRK2 variants. LRRK2 variants showed similar frequency in each AAO group. Of note, we identified two novel variants. Patients with early-onset PD have more genetic risk factors than patients with late-onset PD. In Japanese patients with PD, PRKN, and LRRK2 were the major PD-related genes. Particularly, LRRK2 was a common genetic factor in all age groups because of the presence of the Asian-specific variant such as LRRK2 p.G2385R. Accumulation of genetic and clinical data can contribute to the development of treatments for PD.
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Affiliation(s)
- Yuhei Kanaya
- Department of Epidemiology, Research Institute for Radiation Biology and Medicine, Hiroshima University, Hiroshima, Japan.,Department of Clinical Neuroscience and Therapeutics, Hiroshima University, Graduate School of Biomedical and Health Sciences, Hiroshima, Japan
| | - Kodai Kume
- Department of Epidemiology, Research Institute for Radiation Biology and Medicine, Hiroshima University, Hiroshima, Japan
| | - Hiroyuki Morino
- Department of Epidemiology, Research Institute for Radiation Biology and Medicine, Hiroshima University, Hiroshima, Japan. .,Department of Clinical Neuroscience and Therapeutics, Hiroshima University, Graduate School of Biomedical and Health Sciences, Hiroshima, Japan.
| | - Ryosuke Ohsawa
- Department of Epidemiology, Research Institute for Radiation Biology and Medicine, Hiroshima University, Hiroshima, Japan
| | - Takashi Kurashige
- Department of Neurology, National Hospital Organization Kure Medical Center and Chugoku Cancer Center, Kure, Japan
| | - Masaki Kamada
- Department of Gastroenterology & Neurology, Faculty of Medicine, Kagawa University, Kagawa, Japan
| | - Tsuyoshi Torii
- Department of Neurology, National Hospital Organization Kure Medical Center and Chugoku Cancer Center, Kure, Japan
| | - Yuishin Izumi
- Department of Neurology, Tokushima University Graduate School of Biomedical Sciences, Tokushima, Japan
| | - Hirofumi Maruyama
- Department of Clinical Neuroscience and Therapeutics, Hiroshima University, Graduate School of Biomedical and Health Sciences, Hiroshima, Japan
| | - Hideshi Kawakami
- Department of Epidemiology, Research Institute for Radiation Biology and Medicine, Hiroshima University, Hiroshima, Japan
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Takata T, Kokudo Y, Morishita A, Kume K, Yachida T, Kamada M, Kobara H, Deguchi K, Touge T, Masugata H, Masaki T. Premedication of hemin for eradication therapy of Helicobacter pylori in patients with porphyria. Clin Case Rep 2021; 9:944-946. [PMID: 33598277 PMCID: PMC7869348 DOI: 10.1002/ccr3.3715] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2020] [Revised: 11/16/2020] [Accepted: 12/12/2020] [Indexed: 11/25/2022] Open
Abstract
Eradication therapy of Helicobacter pylori may be safe if hemin has been intravenously administered in advance, even in patients with a history of recurrent acute porphyria attack.
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Affiliation(s)
- Tadayuki Takata
- Department of General Internal MedicineKagawa University Faculty of MedicineMikiJapan
- Department of NeurologyKagawa University Faculty of MedicineMikiJapan
| | - Yohei Kokudo
- Department of Intractable Neurological ResearchFaculty of MedicineKagawa UniversityMikiJapan
| | - Asahiro Morishita
- Department of GastroenterologyKagawa University Faculty of MedicineMikiJapan
| | - Kodai Kume
- Department of NeurologyKagawa University Faculty of MedicineMikiJapan
| | - Tatsuo Yachida
- Department of GastroenterologyKagawa University Faculty of MedicineMikiJapan
| | - Masaki Kamada
- Department of Intractable Neurological ResearchFaculty of MedicineKagawa UniversityMikiJapan
| | - Hideki Kobara
- Department of GastroenterologyKagawa University Faculty of MedicineMikiJapan
| | - Kazushi Deguchi
- Department of NeurologyKagawa University Faculty of MedicineMikiJapan
| | - Tetsuo Touge
- Department of Health SciencesKagawa University Faculty of MedicineMikiJapan
| | - Hisashi Masugata
- Department of General Internal MedicineKagawa University Faculty of MedicineMikiJapan
| | - Tsutomu Masaki
- Department of GastroenterologyKagawa University Faculty of MedicineMikiJapan
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Kurashige T, Kuramochi M, Ohsawa R, Yamashita Y, Shioi G, Morino H, Kamada M, Ayaki T, Ito H, Sotomaru Y, Maruyama H, Kawakami H. Optineurin defects cause TDP43-pathology with autophagic vacuolar formation. Neurobiol Dis 2020; 148:105215. [PMID: 33296728 DOI: 10.1016/j.nbd.2020.105215] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2020] [Revised: 11/24/2020] [Accepted: 12/03/2020] [Indexed: 11/17/2022] Open
Abstract
We previously showed that optineurin (OPTN) mutations lead to the development of amyotrophic lateral sclerosis. The association between OPTN mutations and the pathogenesis of amyotrophic lateral sclerosis remains unclear. To investigate the mechanism underlying its pathogenesis, we generated Optn knockout mice. We evaluated histopathological observations of these mice and compared with those of OPTN- amyotrophic lateral sclerosis cases to investigate the mechanism underlying the pathogenesis of amyotrophic lateral sclerosis caused by OPTN mutations. The Optn (-/-) mice presented neuronal autophagic vacuoles immunopositive for charged multivesicular body protein 2b, one of the hallmarks of granulovacuolar degenerations, in the cytoplasm of spinal cord motor neurons at the age of 8 months and the OPTN- amyotrophic lateral sclerosis case with homozygous Q398X mutation. In addition, Optn (-/-) mice showed TAR-DNA binding protein 43/sequestosome1/p62 -positive cytoplasmic inclusions and the clearance of nuclear TAR-DNA binding protein 43. The axonal degeneration of the sciatic nerves was observed in Optn (-/-) mice. However, we could not observe significant differences in survival time, body weight, and motor functions, at 24 months. Our findings suggest that homozygous OPTN deletion or mutations might result in autophagic dysfunction and TAR-DNA binding protein 43 mislocalization, thereby leading to neurodegeneration of motor neurons. These findings indicate that the Optn (-/-) mice recapitulate both common and specific pathogenesis of amyotrophic lateral sclerosis associated with autophagic abnormalities. Optn (-/-) mice could serve as a mouse model for the development of therapeutic strategies.
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Affiliation(s)
- Takashi Kurashige
- Department of Neurology, National Hospital Organization Kure Medical Center and Chugoku Cancer Center, 3-1 Aoyama-machi, Kure 737-0023, Japan
| | - Masahito Kuramochi
- Department of Epidemiology, Research Institute for Radiation Biology and Medicine, Hiroshima University, 1-2-3 Kasumi, Minami-ku, Hiroshima 734-8553, Japan
| | - Ryosuke Ohsawa
- Department of Epidemiology, Research Institute for Radiation Biology and Medicine, Hiroshima University, 1-2-3 Kasumi, Minami-ku, Hiroshima 734-8553, Japan
| | - Yui Yamashita
- Animal Resource Development Unit, RIKEN Center for Biosystems Dynamics Research, 2-2-3 Minatojima Minami-machi, Chuou-ku, Kobe 650-0047, Japan; Laboratory for Genetic Engineering, RIKEN Center for Biosystems Dynamics Research, Kobe 650-0047, Japan
| | - Go Shioi
- Laboratory for Genetic Engineering, RIKEN Center for Biosystems Dynamics Research, Kobe 650-0047, Japan
| | - Hiroyuki Morino
- Department of Epidemiology, Research Institute for Radiation Biology and Medicine, Hiroshima University, 1-2-3 Kasumi, Minami-ku, Hiroshima 734-8553, Japan
| | - Masaki Kamada
- Department of Neurological Intractable Disease Research, Kagawa University Faculty of Medicine, Kagawa 761-0793, Japan
| | - Takashi Ayaki
- Department of Neurology, Kyoto University Graduate School of Medicine, 54 Kawaramachi, Shogoin, Sakyo-ku Kyoto 606-8507, Japan
| | - Hidefumi Ito
- Department of Neurology, Wakayama Medical University, 811-1 Kimiidera, Wakayama 641-8509, Japan
| | - Yusuke Sotomaru
- Natural Science Center for Basic Research and Development, Hiroshima University, 1-2-3 Kasumi, Minami-ku, Hiroshima 734-8553, Japan
| | - Hirofumi Maruyama
- Department of Clinical Neuroscience and Therapeutics, Graduate School of Biomedical and Health Sciences, Hiroshima University, 1-2-3 Kasumi, Minami-ku, Hiroshima 734-8553, Japan
| | - Hideshi Kawakami
- Department of Epidemiology, Research Institute for Radiation Biology and Medicine, Hiroshima University, 1-2-3 Kasumi, Minami-ku, Hiroshima 734-8553, Japan.
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Chiba Y, Murakami R, Matsumoto K, Wakamatsu K, Nonaka W, Uemura N, Yanase K, Kamada M, Ueno M. Glucose, Fructose, and Urate Transporters in the Choroid Plexus Epithelium. Int J Mol Sci 2020; 21:E7230. [PMID: 33008107 PMCID: PMC7582461 DOI: 10.3390/ijms21197230] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2020] [Revised: 09/25/2020] [Accepted: 09/28/2020] [Indexed: 02/07/2023] Open
Abstract
The choroid plexus plays a central role in the regulation of the microenvironment of the central nervous system by secreting the majority of the cerebrospinal fluid and controlling its composition, despite that it only represents approximately 1% of the total brain weight. In addition to a variety of transporter and channel proteins for solutes and water, the choroid plexus epithelial cells are equipped with glucose, fructose, and urate transporters that are used as energy sources or antioxidative neuroprotective substrates. This review focuses on the recent advances in the understanding of the transporters of the SLC2A and SLC5A families (GLUT1, SGLT2, GLUT5, GLUT8, and GLUT9), as well as on the urate-transporting URAT1 and BCRP/ABCG2, which are expressed in choroid plexus epithelial cells. The glucose, fructose, and urate transporters repertoire in the choroid plexus epithelium share similar features with the renal proximal tubular epithelium, although some of these transporters exhibit inversely polarized submembrane localization. Since choroid plexus epithelial cells have high energy demands for proper functioning, a decline in the expression and function of these transporters can contribute to the process of age-associated brain impairment and pathophysiology of neurodegenerative diseases.
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Affiliation(s)
- Yoichi Chiba
- Department of Pathology and Host Defense, Faculty of Medicine, Kagawa University, 1750-1 Ikenobe, Miki-cho, Kita-gun, Kagawa 761-0793, Japan; (Y.C.); (R.M.); (K.M.); (K.W.)
| | - Ryuta Murakami
- Department of Pathology and Host Defense, Faculty of Medicine, Kagawa University, 1750-1 Ikenobe, Miki-cho, Kita-gun, Kagawa 761-0793, Japan; (Y.C.); (R.M.); (K.M.); (K.W.)
| | - Koichi Matsumoto
- Department of Pathology and Host Defense, Faculty of Medicine, Kagawa University, 1750-1 Ikenobe, Miki-cho, Kita-gun, Kagawa 761-0793, Japan; (Y.C.); (R.M.); (K.M.); (K.W.)
| | - Keiji Wakamatsu
- Department of Pathology and Host Defense, Faculty of Medicine, Kagawa University, 1750-1 Ikenobe, Miki-cho, Kita-gun, Kagawa 761-0793, Japan; (Y.C.); (R.M.); (K.M.); (K.W.)
| | - Wakako Nonaka
- Department of Supportive and Promotive Medicine of the Municipal Hospital, Faculty of Medicine, Kagawa University, 1750-1 Ikenobe, Miki-cho, Kita-gun, Kagawa 761-0793, Japan;
- Department of Gastroenterology and Neurology, Faculty of Medicine, Kagawa University, 1750-1 Ikenobe, Miki-cho, Kita-gun, Kagawa 761-0793, Japan
| | - Naoya Uemura
- Department of Anesthesiology, Faculty of Medicine, Kagawa University, 1750-1 Ikenobe, Miki-cho, Kita-gun, Kagawa 761-0793, Japan; (N.U.); (K.Y.)
| | - Ken Yanase
- Department of Anesthesiology, Faculty of Medicine, Kagawa University, 1750-1 Ikenobe, Miki-cho, Kita-gun, Kagawa 761-0793, Japan; (N.U.); (K.Y.)
| | - Masaki Kamada
- Department of Neurological Intractable Disease Research, Faculty of Medicine, Kagawa University, 1750-1 Ikenobe, Miki-cho, Kita-gun, Kagawa 761-0793, Japan;
| | - Masaki Ueno
- Department of Pathology and Host Defense, Faculty of Medicine, Kagawa University, 1750-1 Ikenobe, Miki-cho, Kita-gun, Kagawa 761-0793, Japan; (Y.C.); (R.M.); (K.M.); (K.W.)
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Yamaguchi Y, Ayaki T, Li F, Tsujimura A, Kamada M, Ito H, Maki T, Sawamoto N, Urushitani M, Takahashi R. Phosphorylated NF-κB subunit p65 aggregates in granulovacuolar degeneration and neurites in neurodegenerative diseases with tauopathy. Neurosci Lett 2019; 704:229-235. [DOI: 10.1016/j.neulet.2019.03.036] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2018] [Revised: 03/15/2019] [Accepted: 03/20/2019] [Indexed: 10/27/2022]
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Nakahara J, Tomaske L, Kume K, Takata T, Kamada M, Deguchi K, Kufukihara K, Schneider R, Gold R, Ayzenberg I. Three cases of non-carryover fingolimod-PML: Is the risk in Japan increased? Neurol Neuroimmunol Neuroinflamm 2019; 6:e559. [PMID: 31044147 PMCID: PMC6467684 DOI: 10.1212/nxi.0000000000000559] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/10/2018] [Accepted: 02/19/2019] [Indexed: 12/16/2022]
Abstract
Objective To report the course of 3 recent Japanese and European cases of fingolimod-associated progressive multifocal leukoencephalopathy (PML) and to analyze its risk factors and increased incidence in Japan. Methods Case series and literature review. Results Fingolimod-associated PML may cause both supratentorial and infratentorial lesions and a pronounced disability. Diagnosis can be challenging because PML lesions (especially infratentorial) can be initially misdiagnosed as extensive MS lesions. Immune reconstitution inflammatory syndrome (IRIS) develops a few weeks after fingolimod discontinuation and is usually mild. Age factor and therapy duration seem to be relevant because most reported patients were older than 45 years and were treated with fingolimod for more than 3 years. Combined IgG/IgM deficiency has been identified as a possible further predisposing condition in 1 case. Another patient developed an endogenous fungal skin infection, as a sign of generally compromised cellular immune response, shortly before PML. None of the reported patients had lymphocyte counts below 200/μl. Two of the 3 reported and 4 of the 21 (19%) registered fingolimod-PML cases occurred in Japan (estimated risk of 0.652 per 1,000 compared with 0.083 per 1.000 worldwide). Conclusions The risk of PML under fingolimod is low, but there are no reliable predictors. Despite a mild IRIS phase, it causes profound disability. Patients older than 45 years, especially with known comorbid immunodeficiencies or manifestation of other opportunistic infections, should be monitored more closely. Increased surveillance and identification of further risk factors are urgently needed in Japan.
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Affiliation(s)
- Jin Nakahara
- Department of Neurology (J.N., K. Kufukihara), Keio University School of Medicine, Tokyo; Department of Neurology (L.T., R.S., R.G., I.A.), St. Josef Hospital, Ruhr University Bochum, Bochum, Germany; Department of Gastroenterology and Neurology (K. Kume, T.T., M.K., K.D.), Kagawa University Faculty of Medicine, Japan; and Department of Neurology (I.A.), Sechenov First Moscow State Medical University, Moscow, Russia
| | - Laura Tomaske
- Department of Neurology (J.N., K. Kufukihara), Keio University School of Medicine, Tokyo; Department of Neurology (L.T., R.S., R.G., I.A.), St. Josef Hospital, Ruhr University Bochum, Bochum, Germany; Department of Gastroenterology and Neurology (K. Kume, T.T., M.K., K.D.), Kagawa University Faculty of Medicine, Japan; and Department of Neurology (I.A.), Sechenov First Moscow State Medical University, Moscow, Russia
| | - Kodai Kume
- Department of Neurology (J.N., K. Kufukihara), Keio University School of Medicine, Tokyo; Department of Neurology (L.T., R.S., R.G., I.A.), St. Josef Hospital, Ruhr University Bochum, Bochum, Germany; Department of Gastroenterology and Neurology (K. Kume, T.T., M.K., K.D.), Kagawa University Faculty of Medicine, Japan; and Department of Neurology (I.A.), Sechenov First Moscow State Medical University, Moscow, Russia
| | - Tadayuki Takata
- Department of Neurology (J.N., K. Kufukihara), Keio University School of Medicine, Tokyo; Department of Neurology (L.T., R.S., R.G., I.A.), St. Josef Hospital, Ruhr University Bochum, Bochum, Germany; Department of Gastroenterology and Neurology (K. Kume, T.T., M.K., K.D.), Kagawa University Faculty of Medicine, Japan; and Department of Neurology (I.A.), Sechenov First Moscow State Medical University, Moscow, Russia
| | - Masaki Kamada
- Department of Neurology (J.N., K. Kufukihara), Keio University School of Medicine, Tokyo; Department of Neurology (L.T., R.S., R.G., I.A.), St. Josef Hospital, Ruhr University Bochum, Bochum, Germany; Department of Gastroenterology and Neurology (K. Kume, T.T., M.K., K.D.), Kagawa University Faculty of Medicine, Japan; and Department of Neurology (I.A.), Sechenov First Moscow State Medical University, Moscow, Russia
| | - Kazushi Deguchi
- Department of Neurology (J.N., K. Kufukihara), Keio University School of Medicine, Tokyo; Department of Neurology (L.T., R.S., R.G., I.A.), St. Josef Hospital, Ruhr University Bochum, Bochum, Germany; Department of Gastroenterology and Neurology (K. Kume, T.T., M.K., K.D.), Kagawa University Faculty of Medicine, Japan; and Department of Neurology (I.A.), Sechenov First Moscow State Medical University, Moscow, Russia
| | - Kenji Kufukihara
- Department of Neurology (J.N., K. Kufukihara), Keio University School of Medicine, Tokyo; Department of Neurology (L.T., R.S., R.G., I.A.), St. Josef Hospital, Ruhr University Bochum, Bochum, Germany; Department of Gastroenterology and Neurology (K. Kume, T.T., M.K., K.D.), Kagawa University Faculty of Medicine, Japan; and Department of Neurology (I.A.), Sechenov First Moscow State Medical University, Moscow, Russia
| | - Ruth Schneider
- Department of Neurology (J.N., K. Kufukihara), Keio University School of Medicine, Tokyo; Department of Neurology (L.T., R.S., R.G., I.A.), St. Josef Hospital, Ruhr University Bochum, Bochum, Germany; Department of Gastroenterology and Neurology (K. Kume, T.T., M.K., K.D.), Kagawa University Faculty of Medicine, Japan; and Department of Neurology (I.A.), Sechenov First Moscow State Medical University, Moscow, Russia
| | - Ralf Gold
- Department of Neurology (J.N., K. Kufukihara), Keio University School of Medicine, Tokyo; Department of Neurology (L.T., R.S., R.G., I.A.), St. Josef Hospital, Ruhr University Bochum, Bochum, Germany; Department of Gastroenterology and Neurology (K. Kume, T.T., M.K., K.D.), Kagawa University Faculty of Medicine, Japan; and Department of Neurology (I.A.), Sechenov First Moscow State Medical University, Moscow, Russia
| | - Ilya Ayzenberg
- Department of Neurology (J.N., K. Kufukihara), Keio University School of Medicine, Tokyo; Department of Neurology (L.T., R.S., R.G., I.A.), St. Josef Hospital, Ruhr University Bochum, Bochum, Germany; Department of Gastroenterology and Neurology (K. Kume, T.T., M.K., K.D.), Kagawa University Faculty of Medicine, Japan; and Department of Neurology (I.A.), Sechenov First Moscow State Medical University, Moscow, Russia
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Hagiwara D, Sato K, Miyazaki M, Kamada M, Moriwaki N, Nakano T, Shiotsuka S, Tokushige C, Toh H, Kamimura H, Togawa A, Takata T. The impact of earlier intervention by an antimicrobial stewardship team for specific antimicrobials in a single weekly intervention. Int J Infect Dis 2018; 77:34-39. [PMID: 30292892 DOI: 10.1016/j.ijid.2018.09.025] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2018] [Revised: 09/26/2018] [Accepted: 09/28/2018] [Indexed: 12/19/2022] Open
Abstract
OBJECTIVE The objective of this study was to evaluate the effects of earlier intervention by an antimicrobial stewardship team (AST) on antimicrobial use, antimicrobial resistance rates, and the clinical outcomes, without changing the weekly intervention schedule. METHODS A retrospective study was conducted at Fukuoka University Hospital between April 2013 and March 2016. The effects were compared among three study periods (SP): SP1 (patients receiving anti-methicillin-resistant Staphylococcus aureus agents and carbapenems for ≥14 days), SP2 (patients receiving specific antimicrobials for ≥14 days), and SP3 (patients receiving specific antimicrobials regardless of the duration of treatment). RESULTS The timing of AST intervention was shortened from an average of 15.5days after administration in SP1 to 4.2 days in SP3. The antimicrobial use density (AUD) of carbapenems and piperacillin-tazobactam decreased significantly (SP2 vs. SP3, p<0.05), and the costs of specific antimicrobials decreased (SP1, US$ 1080000; SP2, US$ 944000; SP3, US$ 763000). The rates of carbapenem resistance among Pseudomonas aeruginosa isolates showed a significant reduction from 16.2% in SP2 to 8.7% in SP3 (p<0.05). The mortality rate and length of stay did not change during the study period. CONCLUSIONS Earlier intervention by an AST could contribute to the proper use of antimicrobials without adversely affecting patient outcomes.
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Affiliation(s)
- D Hagiwara
- Department of Pharmacy, Fukuoka University Hospital, Fukuoka, Japan
| | - K Sato
- Department of Pharmacy, Fukuoka University Hospital, Fukuoka, Japan
| | - M Miyazaki
- Department of Pharmacy, Fukuoka University Chikushi Hospital, Fukuoka, Japan
| | - M Kamada
- Department of Pharmacy, Fukuoka University Hospital, Fukuoka, Japan
| | - N Moriwaki
- Department of Pharmacy, Fukuoka University Hospital, Fukuoka, Japan
| | - T Nakano
- Department of Pharmacology, Faculty of Pharmaceutical Sciences, Fukuoka University, Fukuoka, Japan
| | - S Shiotsuka
- Department of Pharmacy, Fukuoka University Hospital, Fukuoka, Japan
| | - C Tokushige
- Department of Clinical Laboratory, Fukuoka University Hospital, Fukuoka, Japan
| | - H Toh
- Department of Clinical Laboratory, Fukuoka University Hospital, Fukuoka, Japan
| | - H Kamimura
- Department of Pharmacy, Fukuoka University Hospital, Fukuoka, Japan
| | - A Togawa
- Department of Infection Control, Fukuoka University Hospital, Fukuoka, Japan; Department of Medical Oncology, Hematology, and Infectious Diseases, Faculty of Medicine, Fukuoka University, Fukuoka, Japan
| | - T Takata
- Department of Infection Control, Fukuoka University Hospital, Fukuoka, Japan; Department of Medical Oncology, Hematology, and Infectious Diseases, Faculty of Medicine, Fukuoka University, Fukuoka, Japan.
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Ikemura S, Yasuda H, Matsumoto S, Kamada M, Betsuyaku T, Okuno Y, Goto K, Tsuchihara K, Soejima K. Clinical characterization of rare EGFR mutations in non-small cell lung cancer and in silico prediction of drug sensitivity. Ann Oncol 2018. [DOI: 10.1093/annonc/mdy292.043] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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Kamada M, Kawarai T, Miyamoto R, Kawakita R, Tojima Y, Montecchiani C, D'Onofrio L, Caltagirone C, Orlacchio A, Kaji R. Spastic paraplegia type 31: A novel REEP1 splice site donor variant and expansion of the phenotype variability. Parkinsonism Relat Disord 2018; 46:79-83. [DOI: 10.1016/j.parkreldis.2017.10.012] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/18/2017] [Revised: 09/28/2017] [Accepted: 10/18/2017] [Indexed: 11/26/2022]
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15
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Ayaki T, Ito H, Komure O, Kamada M, Nakamura M, Wate R, Kusaka H, Yamaguchi Y, Li F, Kawakami H, Urushitani M, Takahashi R. Multiple Proteinopathies in Familial ALS Cases With Optineurin Mutations. J Neuropathol Exp Neurol 2017; 77:128-138. [DOI: 10.1093/jnen/nlx109] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
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16
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Kume K, Iwama H, Deguchi K, Ikeda K, Takata T, Kokudo Y, Kamada M, Fujikawa K, Hirose K, Masugata H, Touge T, Masaki T. Serum microRNA expression profiling in patients with multiple system atrophy. Mol Med Rep 2017; 17:852-860. [PMID: 29115515 PMCID: PMC5780164 DOI: 10.3892/mmr.2017.7995] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2016] [Accepted: 04/26/2017] [Indexed: 12/12/2022] Open
Abstract
Multiple system atrophy (MSA) is a sporadic neurodegenerative disease that is pathologically characterized by α-synuclein positive glial cytoplasmic inclusions in oligodendrocytes. The clinical diagnosis of MSA is often challenging as there are no established biomarkers and diagnoses are now based on clinical findings alone. At present, the etiology and pathogenesis of MSA are unclear. It has been reported that dysregulation of microRNA (miRNA/miR) serves an important role in neurodegenerative disorders including Alzheimer's disease, Parkinson's disease and amyotrophic lateral sclerosis. The miRNA profile of patients with MSA remains to be established. The present study investigated the serum miRNA expression level of 10 patients with MSA, using microarray chips including 668 miRNAs. It was identified that 50 miRNAs were significantly upregulated and 17 miRNAs were significantly downregulated in the serum of the patients with MSA. The most upregulated miRNA was miR-16, which may induce the accumulation of α-synuclein. The target genes of some miRNAs upregulated in MSA (including miR-17, 20a, 24, 25, 30d and 451) were associated with autophagy-associated molecules. The present study concluded that the expression pattern of miRNAs may be a clinical biomarker for MSA and targeting these miRNAs may provide a novel treatment for MSA.
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Affiliation(s)
- Kodai Kume
- Department of Neurology, Kagawa University Hospital, Kita‑gun, Kagawa 761‑0793, Japan
| | - Hisakazu Iwama
- Life Science Research Center, Faculty of Medicine, Kagawa University, Kita‑gun, Kagawa 761‑0793, Japan
| | - Kazushi Deguchi
- Department of Neurology, Kagawa University Hospital, Kita‑gun, Kagawa 761‑0793, Japan
| | - Kazuyo Ikeda
- Department of Gastroenterology and Neurology, Faculty of Medicine, Kagawa University, Kita‑gun, Kagawa 761‑0793, Japan
| | - Tadayuki Takata
- Department of Gastroenterology and Neurology, Faculty of Medicine, Kagawa University, Kita‑gun, Kagawa 761‑0793, Japan
| | - Yohei Kokudo
- Department of Intractable Neurological Research, Faculty of Medicine, Kagawa University, Kita‑gun, Kagawa 761‑0793, Japan
| | - Masaki Kamada
- Department of Intractable Neurological Research, Faculty of Medicine, Kagawa University, Kita‑gun, Kagawa 761‑0793, Japan
| | - Keiko Fujikawa
- Department of Gastroenterology and Neurology, Faculty of Medicine, Kagawa University, Kita‑gun, Kagawa 761‑0793, Japan
| | - Kayo Hirose
- Department of Gastroenterology and Neurology, Faculty of Medicine, Kagawa University, Kita‑gun, Kagawa 761‑0793, Japan
| | - Hisashi Masugata
- Department of Integrated Medicine, Faculty of Medicine, Kagawa University, Kita‑gun, Kagawa 761‑0793, Japan
| | - Tetsuo Touge
- Department of Health Sciences, Faculty of Medicine, Kagawa University, Kita‑gun, Kagawa 761‑0793, Japan
| | - Tsutomu Masaki
- Department of Gastroenterology and Neurology, Faculty of Medicine, Kagawa University, Kita‑gun, Kagawa 761‑0793, Japan
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Kamada M, Kawarai T, Kawakita R, Miyamoto R, Tojima Y, Orlacchio A, Kaji R. Hereditary spastic paraplegia type 31: A novel splice site donor mutation and intra-familial phenotypic variability. J Neurol Sci 2017. [DOI: 10.1016/j.jns.2017.08.3296] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Watanabe T, Kamata K, Hasan S, Shibusawa S, Kamada M, Yonekura T, Yamada M, Ohashi Y. Design and Implementation of an Antagonistic Exercise Support System Using a Depth Image Sensor. EAI Endorsed Transactions on Pervasive Health and Technology 2017. [DOI: 10.4108/eai.13-7-2017.152887] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
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Naito H, Takahashi T, Kamada M, Morino H, Yoshino H, Hattori N, Maruyama H, Kawakami H, Matsumoto M. First report of a Japanese family with spinocerebellar ataxia type 10: The second report from Asia after a report from China. PLoS One 2017; 12:e0177955. [PMID: 28542277 PMCID: PMC5438172 DOI: 10.1371/journal.pone.0177955] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2016] [Accepted: 05/05/2017] [Indexed: 12/12/2022] Open
Abstract
Spinocerebellar ataxia type 10 (SCA10) is an autosomal-dominant cerebellar ataxia that is variably accompanied by epilepsy and other neurological disorders. It is caused by an expansion of the ATTCT pentanucleotide repeat in intron 9 of the ATXN10 gene. Until now, SCA10 was almost exclusively found in the American continents, while no cases had been identified in Japan. Here, we report the first case of an SCA10 family from Japan. The clinical manifestations in our cases were cerebellar ataxia accompanied by epilepsy, hyperreflexia and cognitive impairment. Although the primary pathology in SCA10 in humans is reportedly the loss of Purkinje cells, brain MRI revealed frontal lobe atrophy with white matter lesions. This pathology might be associated with cognitive dysfunction, indicating that the pathological process is not limited to the cerebellum. Examination of the SNPs surrounding the SCA10 locus in the proband showed the “C-expansion-G-G-C” haplotype, which is consistent with previously reported SCA10-positive individuals. This result was consistent with the findings that the SCA10 mutation may have occurred before the migration of Amerindians from East Asia to North America and the subsequent spread of their descendants throughout North and South America.
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Affiliation(s)
- Hiroyuki Naito
- Department of Clinical Neuroscience and Therapeutics, Hiroshima University Graduate School of Biomedical and Health Sciences, Hiroshima, Japan
| | - Tetsuya Takahashi
- Department of Clinical Neuroscience and Therapeutics, Hiroshima University Graduate School of Biomedical and Health Sciences, Hiroshima, Japan
- * E-mail:
| | - Masaki Kamada
- Department of Neurological Intractable Disease Research, Kagawa University School of Medicine, Kagawa, Japan
| | - Hiroyuki Morino
- Department of Epidemiology, Research Institute for Radiation Biology and Medicine, Hiroshima University, Hiroshima, Japan
| | - Hiroyo Yoshino
- Research Institute for Diseases of Old Age, Juntendo University School of Medicine, Tokyo, Japan
| | - Nobutaka Hattori
- Department of Neurology, Juntendo University School of Medicine, Tokyo, Japan
| | - Hirofumi Maruyama
- Department of Clinical Neuroscience and Therapeutics, Hiroshima University Graduate School of Biomedical and Health Sciences, Hiroshima, Japan
| | - Hideshi Kawakami
- Department of Epidemiology, Research Institute for Radiation Biology and Medicine, Hiroshima University, Hiroshima, Japan
| | - Masayasu Matsumoto
- Department of Clinical Neuroscience and Therapeutics, Hiroshima University Graduate School of Biomedical and Health Sciences, Hiroshima, Japan
- Japan Community Health care Organization, Hoshigaoka Medical Center, Osaka, Japan
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Takata T, Kume K, Kokudo Y, Ikeda K, Kamada M, Touge T, Deguchi K, Masaki T. Acute Intermittent Porphyria Presenting with Posterior Reversible Encephalopathy Syndrome, Accompanied by Prolonged Vasoconstriction. Intern Med 2017; 56:713-717. [PMID: 28321076 PMCID: PMC5410486 DOI: 10.2169/internalmedicine.56.7654] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
A 20-year-old Japanese woman had an attack of acute intermittent porphyria (AIP). Magnetic resonance imaging (MRI) revealed symmetrical lesions in the cerebrum and cerebellar hemisphere, corresponding to posterior reversible encephalopathy syndrome (PRES). Our administration of heme arginate gradually improved the clinical condition associated with AIP and the level of metabolite of nitric oxide (NO), which is a vascular dilator. Repeated MRI and magnetic resonance angiography revealed exacerbated PRES, part of which showed a small infarction, accompanied by progressive vasoconstriction. These findings suggest that the recovery of NO by heme replacement alone is insufficient for preventing brain damage during an AIP attack.
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Kamada M, Nakane S, Matsui N, Higuchi O, Sakai W, Fujita K, Izumi Y, Matsuo H, Kaji R. Ocular myasthenia gravis with anti‐muscle‐specific tyrosine kinase antibodies: Two new cases and a systematic literature review. ACTA ACUST UNITED AC 2016. [DOI: 10.1111/cen3.12296] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Affiliation(s)
- Masaki Kamada
- Department of Neurology Institute of Health Bioscience Tokushima University Graduate School of Medicine Tokushima Japan
- Department of Neurological Intractable Disease Research Kagawa University School of Medicine Kagawa Japan
| | - Shunya Nakane
- Department of Clinical Research Nagasaki Kawatana Medical Center Nagasaki Japan
- Department of Neurology Nagasaki Kawatana Medical Center Nagasaki Japan
| | - Naoko Matsui
- Department of Neurology Institute of Health Bioscience Tokushima University Graduate School of Medicine Tokushima Japan
| | - Osamu Higuchi
- Department of Clinical Research Nagasaki Kawatana Medical Center Nagasaki Japan
| | - Waka Sakai
- Department of Neurology Institute of Health Bioscience Tokushima University Graduate School of Medicine Tokushima Japan
- Department of Neurology Nagasaki Kawatana Medical Center Nagasaki Japan
| | - Koji Fujita
- Department of Neurology Institute of Health Bioscience Tokushima University Graduate School of Medicine Tokushima Japan
| | - Yuishin Izumi
- Department of Neurology Institute of Health Bioscience Tokushima University Graduate School of Medicine Tokushima Japan
| | - Hidenori Matsuo
- Department of Neurology Nagasaki Kawatana Medical Center Nagasaki Japan
| | - Ryuji Kaji
- Department of Neurology Institute of Health Bioscience Tokushima University Graduate School of Medicine Tokushima Japan
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Akiyama T, Warita H, Kato M, Nishiyama A, Izumi R, Ikeda C, Kamada M, Suzuki N, Aoki M. Genotype-phenotype relationships in familial amyotrophic lateral sclerosis with FUS/TLS mutations in Japan. Muscle Nerve 2016; 54:398-404. [PMID: 26823199 DOI: 10.1002/mus.25061] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/25/2016] [Indexed: 12/19/2022]
Abstract
INTRODUCTION We investigated possible genotype-phenotype correlations in Japanese patients with familial amyotrophic lateral sclerosis (FALS) carrying fused in sarcoma/translated in liposarcoma (FUS/TLS) gene mutations. METHODS A consecutive series of 111 Japanese FALS pedigrees were screened for copper/zinc superoxide dismutase 1 (SOD1) and FUS/TLS gene mutations. Clinical data, including onset age, onset site, disease duration, and extramotor symptoms, were collected. RESULTS Nine different FUS/TLS mutations were found in 12 pedigrees. Most of the patients with FUS/TLS-linked FALS demonstrated early onset in the brainstem/upper cervical region, and relatively short disease duration. A few mutations exhibited phenotypes that were distinct from typical cases. Frontotemporal dementia was present in 1 patient. CONCLUSIONS This study revealed a characteristic phenotype in FUS/TLS-linked FALS patients in Japan. FUS/TLS screening is recommended in patients with FALS with this phenotype. Muscle Nerve 54: 398-404, 2016.
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Affiliation(s)
- Tetsuya Akiyama
- Department of Neurology, Tohoku University Graduate School of Medicine, 1-1 Seiryo-machi, Aoba-ku, Sendai, 980-8574, Japan
| | - Hitoshi Warita
- Department of Neurology, Tohoku University Graduate School of Medicine, 1-1 Seiryo-machi, Aoba-ku, Sendai, 980-8574, Japan
| | - Masaaki Kato
- Department of Neurology, Tohoku University Graduate School of Medicine, 1-1 Seiryo-machi, Aoba-ku, Sendai, 980-8574, Japan
| | - Ayumi Nishiyama
- Department of Neurology, Tohoku University Graduate School of Medicine, 1-1 Seiryo-machi, Aoba-ku, Sendai, 980-8574, Japan
| | - Rumiko Izumi
- Department of Neurology, Tohoku University Graduate School of Medicine, 1-1 Seiryo-machi, Aoba-ku, Sendai, 980-8574, Japan
| | - Chikako Ikeda
- Department of Neuropsychiatry, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama, Japan
| | - Masaki Kamada
- Department of Neurological Intractable Disease Research, Kagawa University Faculty of Medicine, Kagawa, Japan
| | - Naoki Suzuki
- Department of Neurology, Tohoku University Graduate School of Medicine, 1-1 Seiryo-machi, Aoba-ku, Sendai, 980-8574, Japan
| | - Masashi Aoki
- Department of Neurology, Tohoku University Graduate School of Medicine, 1-1 Seiryo-machi, Aoba-ku, Sendai, 980-8574, Japan
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Takata T, Kokudo Y, Kume K, Ikeda K, Kamada M, Touge T, Deguchi K, Masaki T. Dialysis-induced Subdural Hematoma in an Arachnoid Cyst Associated with Autosomal Dominant Polycystic Kidney Disease. Intern Med 2016; 55:2065-7. [PMID: 27477416 DOI: 10.2169/internalmedicine.55.6295] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Arachnoid cyst (AC) is a neurological complication of autosomal dominant polycystic kidney disease (ADPKD). Although an AC can increase the risk of a subdural hematoma, the clinical presentation of bleeding into an AC associated with ADPKD is not well known. We herein report the case of a 59-year-old woman in whom the initiation of hemodialysis for renal failure led to AC bleeding. A change of anticoagulant from heparin to nafamostat mesilate allowed dialysis to continue without rebleeding. These findings suggest that hemodialysis in patients with an AC associated with ADPKD may increase the risk of bleeding. Nafamostat mesilate may be useful in such cases.
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Affiliation(s)
- Tadayuki Takata
- Department of Intractable Neurological Research, Kagawa University Faculty of Medicine, Japan
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Kume K, Kamada M, Kokudo Y, Takata T, Ikeda K, Deguchi K, Masaki T, Touge T. 3-A-D-2-5. Prolonged central conduction time in a patient with Guillain–Barre syndrome presenting Babinski’s sign. Clin Neurophysiol 2015. [DOI: 10.1016/j.clinph.2015.02.053] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Deguchi K, Ikeda K, Kume K, Takata T, Kokudo Y, Kamada M, Touge T, Honjo N, Masaki T. Significance of the hot-cross bun sign on T2*-weighted MRI for the diagnosis of multiple system atrophy. J Neurol 2015; 262:1433-9. [PMID: 25845765 DOI: 10.1007/s00415-015-7728-1] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2015] [Revised: 03/26/2015] [Accepted: 03/27/2015] [Indexed: 12/27/2022]
Abstract
Although the sensitive detection of putaminal iron deposition by T2*-weighted imaging (T2*-WI) is of diagnostic value for multiple system atrophy (MSA), the diagnostic significance of the pontine hot-cross bun (HCB) sign with increased ferritin-bound iron in the background remains unknown. We retrospectively evaluated the cases of 33 patients with cerebellar-form MSA (MSA-C) and 21 with MSA of the parkinsonian form (MSA-P) who underwent an MRI study with a 1.5-T system. Visualization of the HCB sign, posterior putaminal hypointensity and putaminal hyperintense rim on T2*-WI was assessed by two neurologists independently using an established visual grade, and were compared with those on T2-weighted imaging (T2-WI). The visual grade of pontine and putaminal signal changes was separately assessed for probable MSA (advanced stage) and possible MSA (early stage). T2*-WI demonstrated significantly higher grades of HCB sign than T2-WI (probable MSA-C, n = 27, p < 0.001; possible MSA-C, n = 6, p < 0.05; probable MSA-P, n = 13, p < 0.01). The visual grade of the HCB sign on T2*-WI in the possible MSA-C patients was comparable to that in the probable MSA-C patients. Although the HCB sign in MSA-P was of lower visual grade than in MSA-C even on T2*-WI, some patients showed evolution of the HCB sign preceding the appearance of the putaminal changes. These findings suggest that T2*-WI is of extreme value for detecting the HCB sign, which is often cited as a hallmark of MSA. The appearance of the HCB sign on T2*-WI might not only support but also improve the diagnosis of MSA.
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Affiliation(s)
- Kazushi Deguchi
- Department of Gastroenterology and Neurology, Kagawa University Faculty of Medicine, 1750-1 Ikenobe, Miki-cho, Kita-gun, Kagawa, 761-0793, Japan,
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Kume K, Deguchi K, Ikeda K, Takata T, Kokudo Y, Kamada M, Touge T, Takahashi T, Kanbayashi T, Masaki T. Neuromyelitis optica spectrum disorder presenting with repeated hypersomnia due to involvement of the hypothalamus and hypothalamus-amygdala linkage. Mult Scler 2015; 21:960-2. [PMID: 25680985 DOI: 10.1177/1352458515569100] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2014] [Accepted: 12/31/2014] [Indexed: 11/15/2022]
Abstract
We report the case of a 46-year-old Japanese woman with neuromyelitis optica spectrum disorder presenting with repeated hypersomnia accompanied by decreased CSF orexin level. First episode associated with hypothalamic-pituitary dysfunction showed bilateral hypothalamic lesions that can cause secondary damage to the orexin neurons. The second episode associated with impaired memory showed a left temporal lesion involving the amygdala. The mechanism remains unknown, but the reduced blood flow in the hypothalamus ipsilateral to the amygdala lesion suggested trans-synaptic hypothalamic dysfunction secondary to the impaired amygdala. A temporal lesion involving the amygdala and hypothalamus could be responsible for hypersomnia due to neuromyelitis optica spectrum disorder.
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Affiliation(s)
- Kodai Kume
- Department of Gastroenterology and Neurology, Kagawa University Faculty of Medicine, Japan
| | - Kazushi Deguchi
- Department of Gastroenterology and Neurology, Kagawa University Faculty of Medicine, Japan
| | - Kazuyo Ikeda
- Department of Neurological Intractable Disease Research, Kagawa University Faculty of Medicine, Japan
| | - Tadayuki Takata
- Department of Gastroenterology and Neurology, Kagawa University Faculty of Medicine, Japan
| | - Yohei Kokudo
- Department of Gastroenterology and Neurology, Kagawa University Faculty of Medicine, Japan
| | - Masaki Kamada
- Department of Neurological Intractable Disease Research, Kagawa University Faculty of Medicine, Japan
| | - Tetsuo Touge
- Department of Health Sciences, Kagawa University Faculty of Medicine, Japan
| | - Toshiyuki Takahashi
- Department of Neurology, Tohoku University Graduate School of Medicine, Japan; Department of Neurology, Yonezawa National Hospital, Japan
| | - Takashi Kanbayashi
- Department of Neuropsychiatry, Akita University School of Medicine, Japan
| | - Tsutomu Masaki
- Department of Gastroenterology and Neurology, Kagawa University Faculty of Medicine, Japan
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Tani A, Yamamoto S, Maegawa M, Kunimi K, Matsui S, Keyama K, Kato T, Uemura H, Kuwahara A, Matsuzaki T, Yasui T, Kamada M, Soeki T, Sata M, Irahara M. Arterial stiffness is increased in young women with endometriosis. J OBSTET GYNAECOL 2014; 35:711-5. [PMID: 25543526 DOI: 10.3109/01443615.2014.992871] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Endometriosis is a chronic gynaecological disorder that is accompanied by inflammation and oxidative stress. Atherosclerosis has a long subclinical progression in arteries of children and young adults decades before overt clinical manifestations of the disease. In this study, we determined arterial stiffness by measuring brachial-ankle pulse wave velocity (baPWV) in women with endometriosis to assess the presence of subclinical atherosclerosis. We also measured markers of inflammation and oxidative stress in women with endometriosis. baPWV in women with endometriosis aged over 30 years was significantly higher than that in women without endometriosis aged over 30 years (p < 0.05), but not in women aged less than 30. Serum high-sensitivity C-reactive protein level in women with endometriosis was significantly higher than that in controls (p < 0.05). Young women with endometriosis show significantly increased arterial stiffness, suggesting that women with endometriosis need to be cautious of the future onset of atherosclerosis.
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Affiliation(s)
- A Tani
- a Department of Obstetrics and Gynecology , Institute of Health Biosciences, The University of Tokushima Graduate School , Tokushima , Japan
| | - S Yamamoto
- a Department of Obstetrics and Gynecology , Institute of Health Biosciences, The University of Tokushima Graduate School , Tokushima , Japan
| | - M Maegawa
- b Department of Obstetrics and Gynecology , Tokushima Prefectural Central Hospital , Tokushima , Japan
| | - K Kunimi
- a Department of Obstetrics and Gynecology , Institute of Health Biosciences, The University of Tokushima Graduate School , Tokushima , Japan
| | - S Matsui
- a Department of Obstetrics and Gynecology , Institute of Health Biosciences, The University of Tokushima Graduate School , Tokushima , Japan
| | - K Keyama
- a Department of Obstetrics and Gynecology , Institute of Health Biosciences, The University of Tokushima Graduate School , Tokushima , Japan
| | - T Kato
- a Department of Obstetrics and Gynecology , Institute of Health Biosciences, The University of Tokushima Graduate School , Tokushima , Japan
| | - H Uemura
- c Department of Preventive Medicine , Institute of Health Biosciences, The University of Tokushima Graduate School , Tokushima , Japan
| | - A Kuwahara
- a Department of Obstetrics and Gynecology , Institute of Health Biosciences, The University of Tokushima Graduate School , Tokushima , Japan
| | - T Matsuzaki
- a Department of Obstetrics and Gynecology , Institute of Health Biosciences, The University of Tokushima Graduate School , Tokushima , Japan
| | - T Yasui
- d Department of Reproductive Technology , Institute of Health Biosciences, The University of Tokushima Graduate School , Tokushima , Japan
| | - M Kamada
- e Department of Obstetrics and Gynecology , Shikoku Central Hospital of the Mutual Aid Association of Public School Teachers , Ehime , Japan
| | - T Soeki
- f Department of Cardiovascular Medicine , Institute of Health Bioscience, The University of Tokushima Graduate School , Tokushima , Japan
| | - M Sata
- f Department of Cardiovascular Medicine , Institute of Health Bioscience, The University of Tokushima Graduate School , Tokushima , Japan
| | - M Irahara
- a Department of Obstetrics and Gynecology , Institute of Health Biosciences, The University of Tokushima Graduate School , Tokushima , Japan
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Touge T, Kume K, Ikeda K, Kamada M, Deguchi K, Nakamura Y. P690: Changes of motor function in elder persons induced by transcranial magnetic stimulation with maximum voluntary muscle contraction for serial 4 days. Clin Neurophysiol 2014. [DOI: 10.1016/s1388-2457(14)50784-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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30
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Kume K, Ikeda K, Deguchi K, Kamada M, Okada M, Tamiya T, Touge T, Masaki T. Advantage of 11C-methionine positron emission tomography for assessing IgG4-related central nervous system lesions. J Neurol 2014; 261:625-7. [PMID: 24532202 DOI: 10.1007/s00415-014-7269-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2013] [Revised: 01/23/2014] [Accepted: 01/28/2014] [Indexed: 11/24/2022]
Affiliation(s)
- Kodai Kume
- Department of Gastroenterology and Neurology, Kagawa University Faculty of Medicine, 1750-1 Ikenobe, Miki-cho, Kita-gun, Kagawa, Japan
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31
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Ikeda K, Deguchi K, Kume K, Kamada M, Touge T, Masaki T. Assessment of sensory perception and processing using current perception threshold in Parkinson's disease. ACTA ACUST UNITED AC 2013. [DOI: 10.1111/ncn3.55] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Kazuyo Ikeda
- Department of Gastroenterology and Neurology; Kagawa University Faculty of Medicine; Kagawa Japan
- Department of Neurological Intractable Disease Research; Kagawa University Faculty of Medicine; Kagawa Japan
| | - Kazushi Deguchi
- Department of Gastroenterology and Neurology; Kagawa University Faculty of Medicine; Kagawa Japan
| | - Kodai Kume
- Department of Gastroenterology and Neurology; Kagawa University Faculty of Medicine; Kagawa Japan
| | - Masaki Kamada
- Department of Neurological Intractable Disease Research; Kagawa University Faculty of Medicine; Kagawa Japan
| | - Tetsuo Touge
- Department of Health Sciences; Kagawa University Faculty of Medicine; Kagawa Japan
| | - Tsutomu Masaki
- Department of Gastroenterology and Neurology; Kagawa University Faculty of Medicine; Kagawa Japan
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Inui T, Kawarai T, Fujita K, Kawamura K, Mitsui T, Orlacchio A, Kamada M, Abe T, Izumi Y, Kaji R. A new CSF1R mutation presenting with an extensive white matter lesion mimicking primary progressive multiple sclerosis. J Neurol Sci 2013; 334:192-5. [DOI: 10.1016/j.jns.2013.08.020] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2013] [Revised: 07/15/2013] [Accepted: 08/14/2013] [Indexed: 10/26/2022]
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Kamada M, Izumi Y, Ayaki T, Nakamura M, Kagawa S, Kudo E, Sako W, Maruyama H, Nishida Y, Kawakami H, Ito H, Kaji R. Clinicopathologic features of autosomal recessive amyotrophic lateral sclerosis associated with optineurin mutation. Neuropathology 2013; 34:64-70. [PMID: 23889540 DOI: 10.1111/neup.12051] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2013] [Revised: 06/07/2013] [Accepted: 06/12/2013] [Indexed: 12/13/2022]
Abstract
We performed clinicopathological analyses of two amyotrophic lateral sclerosis (ALS) patients with homozygous Q398X optineurin (OPTN) mutation. Clinically, both patients presented signs of upper and lower motor neuron degeneration, but only Patient 1 showed gradual frontal dysfunction and extrapyramidal signs, and temporal lobe and motor cortex atrophy. Neuropathological examination of Patient 1 revealed extensive cortical and spinal motor neuron degeneration and widespread degeneration of the basal ganglia. Bilateral corticospinal tracts exhibited degeneration. Loss of spinal anterior horn cells (AHCs) and gliosis were observed, whereas posterior columns, Clarke's columns, intermediate lateral columns, and the Onuf's nucleus were spared. In the brainstem, moderate neuronal loss and gliosis were noted in the hypoglossal and facial motor nuclei. No Bunina bodies were found in the surviving spinal and brainstem motor neurons. Transactivation response (TAR) DNA-binding protein 43 (TDP-43)-positive neuronal and glial cytoplasmic inclusions were observed throughout the central nervous system. The Golgi apparatus in motor neurons of the brainstem and spinal cord was often fragmented. Immunoreactivity for OPTN was not observed in the brain and spinal cord, consistent with nonsense-mediated mRNA decay of OPTN. The TDP-43 pathology of Q398X was similar to that of an autosomal dominant E478G mutation. This result suggests that the loss-of-function, but not the proteinopathy itself, of OPTN results in TDP-43 deposits in neuronal and glial cytoplasm and Golgi apparatus fragmentation, leading to multisystem neurodegeneration.
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Affiliation(s)
- Masaki Kamada
- Department of Clinical Neuroscience, Institute of Health Biosciences, The University of Tokushima Graduate School, Tokushima, Japan; Department of Neurological Intractable Disease Research, Kagawa University School of Medicine, Kagawa, Japan
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34
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Kim HJ, Kim KS, Wang JF, Kulbachinskii VA, Ogawa K, Sasaki M, Ohnishi A, Kitaura M, Wu YY, Li L, Yamamoto I, Azuma J, Kamada M, Dobrosavljević V. Topological phase transitions driven by magnetic phase transitions in Fe(x)Bi2Te3 (0≤x≤0.1) single crystals. Phys Rev Lett 2013; 110:136601. [PMID: 23581352 DOI: 10.1103/physrevlett.110.136601] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/06/2012] [Revised: 12/04/2012] [Indexed: 06/02/2023]
Abstract
We propose a phase diagram for Fe(x)Bi2Te3 (0≤x≤0.1) single crystals, which belong to a class of magnetically bulk-doped topological insulators. The evolution of magnetic correlations from ferromagnetic to antiferromagnetic gives rise to topological phase transitions, where the paramagnetic topological insulator of Bi2Te3 turns into a band insulator with ferromagnetic-cluster glassy behavior around x∼0.025, and it further evolves to a topological insulator with valence-bond glassy behavior, which spans over the region from x∼0.03 up to x∼0.1. This phase diagram is verified by measuring magnetization, magnetotransport, and angle-resolved photoemission spectra with theoretical discussions.
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Affiliation(s)
- Heon-Jung Kim
- Department of Physics, College of Natural Science, Daegu University, Gyeongbuk 712-714, Republic of Korea.
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Kawarai T, Pasco PMD, Teleg RA, Kamada M, Sakai W, Shimozono K, Mizuguchi M, Tabuena D, Orlacchio A, Izumi Y, Goto S, Lee LV, Kaji R. Application of long-range polymerase chain reaction in the diagnosis of X-linked dystonia–parkinsonism. Neurogenetics 2013; 14:167-9. [DOI: 10.1007/s10048-013-0357-x] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2012] [Accepted: 02/11/2013] [Indexed: 11/29/2022]
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36
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Kume K, Ikeda K, Kamada M, Touge T, Deguchi K, Masaki T. [Successful treatment of HIV-associated chronic inflammatory demyelinating polyneuropathy by early initiation of highly active anti-retroviral therapy]. Rinsho Shinkeigaku 2013; 53:362-366. [PMID: 23719984 DOI: 10.5692/clinicalneurol.53.362] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
A 47-year-old man with HIV infection presented with lower leg dominant dysesthesia, muscle weakness and sensory ataxia of 3 month's duration. Nerve conduction studies (NCS) showed demyelination change in the median and tibial nerves and sensory nerve action potential (SNAP) in the sural nerve was not evoked. Somatosensory evoked potential (SEP) showed the delayed N9 latency. Diagnose of HIV-associated chronic inflammatory demyelinating polyneuropathy (CIDP) was made. Although the CD4 lymphocyte counts were relatively preserved (466/μl), highly active anti-retroviral therapy (HAART) was started according to a new guideline for the use of antiretroviral agents in HIV-1-infected adults and adolescents recommending early initiation of treatment. After six months, HIV1-RNA was not detected and the CD4 lymphocyte counts showed a recovering trend (585/μl). His symptoms had disappeared, except for dysesthesia in the tip of a toe. Repeated NCS demonstrated full recovery from the demyelination and appearance of SNAP in the sural nerve. The improvement of his symptoms and NCS findings has been maintained for two years. Although effectiveness of immunotherapies such as oral prednisone, high-dose immunoglobulins and plasmapheresis have been reported in HIV-associated CIDP, early initiation of HAART may be also important for favorable prognosis in HIV-associated CIDP.
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Affiliation(s)
- Kodai Kume
- Department of Gastroenterology and Neurology, Kagawa University Faculty of Medicine
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Kamada M, Kumazaki T, Kawahara Y, Matsuo T, Mitsui Y, Takahashi T. 371 Ageing and Cancer-related Gene Expression of the Human Cell Lines Transfected With K-RAS12V, BMI-1 and BCL-2 Or/and TERT. Eur J Cancer 2012. [DOI: 10.1016/s0959-8049(12)71057-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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38
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Matsuo T, Kamada M, Kumazaki T, Kawahara Y, Takahashi T, Mitsui Y. 378 Transformation and Aeging of Human IPSC Teratoma-derived Cells. Eur J Cancer 2012. [DOI: 10.1016/s0959-8049(12)71064-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Kamada M, Kawamoto S, Motoyoshi N, Saiki Y, Oda K, Akasaka J, Nitta Y, Akimoto H, Tabayashi K. [Is emergency aortic root replacement combined with arch replacement safe?]. Kyobu Geka 2012; 65:347-356. [PMID: 22569490] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
BACKGROUND Aortic root replacement (ARR) combined with aortic arch replacement (AAR) is an invasive procedure even in elective cases. Nevertheless, such combined operations are often mandatory in acute type A aortic dissection. We examined whether emergency operation might have further incremental risks compared with elective surgery in this type of operations. METHODS Forty-six cases of ARR combined with AAR were divided into 2 groups, the emergency (EM) group and the elective (EL) group. The EM group consisted of 10 cases of acute type A aortic dissection, whereas the EL group of 36:23 of chronic aortic dissection and 13 of true aneurysm. RESULTS There were no statistical differences between the 2 groups in the durations of aortic crossclamp, selective cerebral perfusion and cardiopulmonary bypass. The incidences in the EM and EL groups were as follows:in-hospital death; 0 vs 3( 8%), respiratory failure; 4 (40%) vs 14 (39%), renal failure; 0 vs 6 (17%), IABP requirement; 1 (10%) vs 3 (8%), and cerebral infarction; 0 vs 1 (3%), respectively. CONCLUSION Early surgical results of emergency ARR combined with AAR were almost equal to those in elective surgery.
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Affiliation(s)
- M Kamada
- Department of Cardiovascular Surgery, School of Medicine, Tohoku University, Sendai, Japan
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Sugihara K, Maruyama H, Kamada M, Morino H, Kawakami H. Screening for OPTN mutations in amyotrophic lateral sclerosis in a mainly Caucasian population. Neurobiol Aging 2011; 32:1923.e9-10. [PMID: 21550138 DOI: 10.1016/j.neurobiolaging.2011.03.024] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2011] [Revised: 03/19/2011] [Accepted: 03/25/2011] [Indexed: 10/18/2022]
Abstract
Mutations in the optineurin (OPTN) gene cause amyotrophic lateral sclerosis (ALS). We previously reported 3 types of OPTN mutation in Japanese ALS subjects. Here, to identify the OPTN mutations in individuals of different ethnicity, we screened 563 sporadic ALS (SALS) subjects and 124 familial ALS (FALS) subjects who were mainly Caucasian. We found a c.964T>C synonymous variation in exon 8. However, we could not find the meaningful OPTN mutations. The results indicate that OPTN mutations causing ALS are rare, especially in mainly Caucasian ALS subjects.
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Affiliation(s)
- Katsunobu Sugihara
- Department of Epidemiology, Research Institute for Radiation Biology and Medicine, Hiroshima University, Minami-ku, Hiroshima, Japan
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Ogawa K, Sasaki M, Ohnishi A, Kitaura M, Fujimoto H, Azuma J, Takahashi K, Kamada M. Valence electronic structure of β-FeSi2 single crystal investigated by photoelectron spectroscopy using synchrotron radiation. ACTA ACUST UNITED AC 2011. [DOI: 10.1016/j.phpro.2011.01.033] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Kamada M, Maruyama H, Tanaka E, Morino H, Wate R, Ito H, Kusaka H, Kawano Y, Miki T, Nodera H, Izumi Y, Kaji R, Kawakami H. Screening for TARDBP mutations in Japanese familial amyotrophic lateral sclerosis. J Neurol Sci 2009; 284:69-71. [PMID: 19411082 DOI: 10.1016/j.jns.2009.04.017] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2008] [Revised: 04/01/2009] [Accepted: 04/14/2009] [Indexed: 12/12/2022]
Abstract
TAR-DNA-binding protein 43 (TDP-43), encoded by the TARDBP gene on chromosome 1p36.22, has been identified as the major pathological protein in abnormal inclusions in neurons and glial cells in sporadic amyotrophic lateral sclerosis (SALS), SOD1-negative familial ALS (FALS) and frontotemporal lobar dementia (FTLD). Twenty mutations of TARDBP in SOD1-negative FALS and SALS cases have been reported so far. To investigate the presence and frequency of TARDBP mutations in Japanese SOD1-negative FALS patients, we performed mutational screening of TARDBP in 30 SOD1-negative FALS patients. An N352S mutation was found in one case of FALS, but no TARDBP mutations were found in cases of SALS. It was thought that this mutation increases TDP-43 phosphorylation. This might lead to impaired nuclear cytoplasmic transport or protein-protein interaction, thereby leading to TDP-43 accumulation.
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Affiliation(s)
- Masaki Kamada
- Department of Epidemiology, Research Institute for Radiation Biology and Medicine, Hiroshima University, 1-2-3 Kasumi, Minami-ku, Hiroshima 734-8553, Japan
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Mukai Y, Asanuma K, Mori A, Kamada M, Kawabata Y, Nodera H, Nakane S, Mitsui T, Izumi Y, Kaji R. [Copper deficiency with SMON-like neurological symptoms and macrocytic anemia]. Nihon Naika Gakkai Zasshi 2008; 97:1876-1878. [PMID: 18788419 DOI: 10.2169/naika.97.1876] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Affiliation(s)
- Youhei Mukai
- Department of Neurology, Tokushima University Hospital, Tokushima
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Affiliation(s)
- Masaki Kamada
- From the Departments of Neurosurgery, Kawasaki Medical School, Okayama, Japan
| | - Yoshihisa Fujita
- Anesthesiology and Intensive Care Medicine, Kawasaki Medical School, Okayama, Japan
| | - Ryoji Ishii
- From the Departments of Neurosurgery, Kawasaki Medical School, Okayama, Japan
| | - Sumiko Endoh
- Anesthesiology and Intensive Care Medicine, Kawasaki Medical School, Okayama, Japan
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Hanada M, Kamada M, Akino N, Ebisawa N, Honda A, Kawai M, Kazawa M, Kikuchi K, Komata M, Mogaki K, Noto K, Ohshima K, Takenouchi T, Tanai Y, Usui K, Yamazaki H, Ikeda Y, Grisham LR. Long pulse production of high current D(-) ion beams in the JT-60 negative ion source. Rev Sci Instrum 2008; 79:02A519. [PMID: 18315140 DOI: 10.1063/1.2821508] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
The first long pulse production of high power D(-) ion beams has been demonstrated in the JT-60 U negative ion sources, each of which was designed to produce 22 A, 500 keV D(-) ion beams. Voltage holding capability and the grid power loading were examined for long pulse production of high power D(-) ion beams. From the correlation between voltage holding and the light intensity of cathodoluminescence from the Fiber Reinforced Plastic insulators, the acceleration voltage for stable voltage holding capability was found to be less than 320-340 kV where the light was sufficiently suppressed. By tuning the extraction voltage, the grid power loadings in the ion sources were decreased to the allowable levels for long pulse injection without a significant reduction of the beam power. After tuning the acceleration and extraction voltages, D(-) ion beams of 12.5 and 9.8 A were produced at 340 keV with cesium seeding at a rate of approximately 14 microg/s into the ion sources. The pulse duration of these D(-) ion beams was extended step by step, and then was successfully extended up to 18 s without degradation of the negative ion production. The D(-) ion beams were neutralized to yield 3.6 MW D(0) beams by a gas cell, and then injected into the JT-60 U plasma. Further, a slight reduction of D(-) ion beam power allowed the longer injection duration of 21 s at a D(0) beam power of 3.2 MW. The success in the long pulse production of a high power D(-) ion beam shows that negative ion beams can be produced during a few tens of seconds without degradations of negative ion production and the voltage holding in a large Cs-seeded negative ion source.
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Affiliation(s)
- M Hanada
- Japan Atomic Energy Agency, Ibaraki, Japan.
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Kamada M, Hanada M, Ikeda Y, Grisham LR, Jiang W. Beamlet deflection due to beamlet-beamlet interaction in a large-area multiaperture negative ion source for JT-60U. Rev Sci Instrum 2008; 79:02C114. [PMID: 18315240 DOI: 10.1063/1.2819333] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
The JT-60U negative ion source has been designed to produce high current beams of 22 A through grids of 1080 apertures (five segments with nine rows of 24 apertures). One of the key issues is to steer such a high current beam through the multiaperture grids in order to focus the overall beam envelope because the beamlet-beamlet interaction may deflect the outer beamlets outward due to unbalanced space charge repulsion. To clarify the beam deflection in the JT-60U negative ion source, the beamlet trajectory in a multiaperture ion source was calculated by a three-dimensional simulation code. The measured angles of the outmost beamlets were in agreement with the calculated results where space charge of the beamlets was taken into account. It is noticed that the deflection of the outermost beamlet due to the beamlet-beamlet interaction is saturated at 5.2 mrad outward for beamlets more than ten.
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Affiliation(s)
- M Kamada
- Japan Atomic Energy Agency, Naka, Ibaraki, Japan.
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Honda K, Nishimiya J, Sato H, Munakata M, Kamada M, Iwamura A, Nemoto H, Sakamoto T, Yuasa T. Transient splenial lesion of the corpus callosum after acute withdrawal of antiepileptic drug: a case report. Magn Reson Med Sci 2007; 5:211-5. [PMID: 17332713 DOI: 10.2463/mrms.5.211] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
Transient lesions at the splenium of the corpus callosum (SCC) have been reported after withdrawal of specific antiepileptic drugs (AED), though the pathophysiology of the lesions remains unclear. We examined and treated a schizophrenic patient who developed a transient SCC lesion after withdrawal of the AED, carbamazepine. Interestingly, the SCC lesion was accompanied by the onset of diabetes insipidus, a state of arginine-vasopressin (AVP) insufficiency. Because carbamazepine is shown to potentiate the effect of AVP, our case suggests that an insufficiency of AVP followed by withdrawal of AED could contribute to the pathogenesis of a transient SCC lesion.
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Affiliation(s)
- Kazuhiro Honda
- Department of Neurology, Kohnodai Hospital, National Center of Neurology and Psychiatry, Chiba, Japan
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Okuda H, Toyota M, Ishida W, Furihata M, Tsuchiya M, Kamada M, Tokino T, Shuin T. Epigenetic inactivation of the candidate tumor suppressor gene HOXB13 in human renal cell carcinoma. Oncogene 2006; 25:1733-42. [PMID: 16278676 DOI: 10.1038/sj.onc.1209200] [Citation(s) in RCA: 66] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Epigenetic alterations like DNA methylation and the resulting inactivation of cancer-related genes often contribute to the development of various cancers. To identify the genes that are silenced by aberrant methylation in renal cell carcinoma (RCC), we subjected two RCC lines to methylated CpG island amplification/representational difference analysis. This identified 27 CpG islands. Combined bisulfite restriction analysis of these CpG islands in primary RCC cases revealed that four were methylated in a tumor-specific manner. One of these was identified as the human homeo-box gene B13 (HOXB13) gene, but the remaining three CpG islands were not associated with known genes. The methylation frequencies of HOXB13 in primary RCC samples and lines were 30 and 73%, respectively. The methylation status of HOXB13 correlated with the loss of its expression both in RCC lines and primary tumors, and methyltransferase inhibitor treatment induced the recovery of its expression. Exogenous expression of HOXB13 in RCC cells that lacked endogenous HOXB13 expression suppressed colony formation and induced apoptotic features. Furthermore, HOXB13 methylation correlated positively with tumor grade and microvessel invasion. These results suggest that HOXB13 is a novel candidate tumor suppressor gene in RCC and that its inactivation may play an important role in both RCC tumorigenesis and progression.
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Affiliation(s)
- H Okuda
- Department of Urology, Kochi Medical School, Nankoku 783-8505, Japan.
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Uemura H, Kamada M, Maegawa M, Ohmoto Y, Murata K, Kuwahara A, Matsuzaki T, Yasui T, Takeji T, Irahara M. Effect of hormone replacement therapy on the production of bone-resorbing cytokines by peripheral blood cells in postmenopausal women. Horm Metab Res 2005; 37:226-30. [PMID: 15952082 DOI: 10.1055/s-2005-861382] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
We studied the effects of hormone replacement therapy (HRT) with estrogen on postmenopausal changes in the production of bone-resorbing cytokines interleukin 1 beta (IL-1beta) and tumor necrosis factor alpha (TNFalpha). Both cytokines were measured in the supernatants of lipopolysaccharide (LPS)-stimulated whole-blood cells from 72 untreated and 44 HRT-treated women by ELISA. The levels of IL-1beta were significantly higher in women in their 40s and 50s and in postmenopausal women than in women in their teens, 20s and 30s, while the levels of TNFalpha did not show any changes related to age. Both levels in HRT-treated women were significantly lower than those in untreated women at almost every postmenopausal stage. In a prospective study, HRT induced significant declines in both levels. These results show that estrogen decreases the accelerated production of IL-1beta and reduces the production of TNFalpha in postmenopausal women at each postmenopausal stage, even in late-postmenopausal women.
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Affiliation(s)
- H Uemura
- Department of Obstetrics and Gynecology, School of Medicine, University of Tokushima, Tokushima, Japan.
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Okuma S, Kobayashi M, Kamada M. Anomalous vortex motion in the quantum-liquid phase of amorphous MoxSi1-x films. Phys Rev Lett 2005; 94:047003. [PMID: 15783585 DOI: 10.1103/physrevlett.94.047003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/10/2004] [Indexed: 05/24/2023]
Abstract
We measure, in real time (t), the fluctuating component of the flux-flow voltage V(t), deltaV(t) identical withV(t)-V0, about the average V0 in the vortex-liquid phase of amorphous MoxSi1-x films. For the thick film, deltaV(t) originating from the vortex motion is clearly visible in the quantum-liquid phase, where the distribution of deltaV(t) is asymmetric, indicative of large velocity and/or number fluctuations of driven vortices. For the thin film the similar anomalous vortex motion is observed in nearly the same (reduced-)temperature regime. These results suggest that vortex dynamics in the low-temperature liquid phase of thick and thin films is dominated by common physical mechanisms, presumably related to quantum effects.
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Affiliation(s)
- S Okuma
- Research Center for Low Temperature Physics, Tokyo Institute of Technology, 2-12-1, Ohokayama, Meguro-ku, Tokyo 152-8551, Japan
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