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Miyake Z, Ishii A, Okiyama N, Tamaoka A. Amyopathic dermatomyositis combined with peripheral neuropathy. BMJ Case Rep 2020; 13:13/11/e237250. [PMID: 33257380 DOI: 10.1136/bcr-2020-237250] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022] Open
Abstract
We provide the first report of amyopathic dermatomyositis combined with peripheral neuropathy. Our patient, a 49-year-old woman, initially experienced muscle weakness and tingling sensations in her legs, and nerve conduction study findings and the detection of antiganglioside antibodies indicated that she had autoimmune peripheral neuropathy. The unexpected presence of skin lesions, interstitial pneumonia and antibodies to melanoma differentiation-associated protein 5 prompted an additional diagnosis of amyopathic dermatomyositis. No previous report has described amyopathic dermatomyositis with peripheral neuropathy, and the present case provides evidence for the once-controversial concept of neuromyositis.
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Affiliation(s)
- Zenshi Miyake
- Neurology, University of Tsukuba Hospital, Tsukuba, Ibaraki, Japan
| | - Akiko Ishii
- Neurology, University of Tsukuba Hospital, Tsukuba, Ibaraki, Japan
| | - Naoko Okiyama
- Dermatology, University of Tsukuba, Tsukuba, Ibaraki, Japan
| | - Akira Tamaoka
- Neurology, University of Tsukuba Hospital, Tsukuba, Ibaraki, Japan
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Naruse H, Ishiura H, Mitsui J, Takahashi Y, Matsukawa T, Sakuishi K, Nakamagoe K, Miyake Z, Tamaoka A, Goto J, Yoshimura J, Doi K, Morishita S, Toda T, Tsuji S. Splice-site mutations in KIF5A in the Japanese case series of amyotrophic lateral sclerosis. Neurogenetics 2020; 22:11-17. [PMID: 32815063 DOI: 10.1007/s10048-020-00626-1] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [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: 06/06/2020] [Accepted: 08/12/2020] [Indexed: 11/29/2022]
Abstract
Our objective was to investigate the frequency of KIF5A variants in amyotrophic lateral sclerosis (ALS) and the clinical characteristics of familial ALS (FALS) associated with variants in KIF5A. Whole-exome sequence analysis was performed for a Japanese series of 43 families with FALS and 444 patients with sporadic ALS (SALS), in whom causative variants had not been identified. We compared the frequencies of rare variants (MAF < 0.01) in KIF5A, including missense and loss of function (LoF) variants, between ALS and control subjects (n = 1163). Clinical characteristics of patients with FALS carrying pathogenic variants in KIF5A were also described. LoF variants were identified only in the probands of two families with FALS, both of which were 3' splice-site variants leading to exon skipping and an altered C-terminal domain, located in the mutational hotspot causing FALS, and were considered to be pathogenic for FALS. Rare missense variants in KIF5A were identified in five patients with SALS (1.13%) and 11 control subjects (0.95%, carrier frequency), which were not significantly different. Consequently, the pathogenic LoF variants in KIF5A accounted for 2.1% of all FALS families in this study. These patients suffered from ALS characteristically associated with the predominant involvement of upper motor neuron. In conclusion, we identified two pathogenic splice-site variants in KIF5A in the probands in two Japanese families with FALS, which altered the C-terminal region of KIF5A. Our findings broaden the phenotype spectrum of ALS associated with variants in KIF5A in the Japanese series.
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Affiliation(s)
- Hiroya Naruse
- Department of Neurology, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
| | - Hiroyuki Ishiura
- Department of Neurology, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
| | - Jun Mitsui
- Department of Neurology, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan.,Department of Molecular Neurology, Graduate School of Medicine, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo, 113-8655, Japan
| | - Yuji Takahashi
- Department of Neurology, National Center Hospital, National Center of Neurology and Psychiatry, Tokyo, Japan
| | - Takashi Matsukawa
- Department of Neurology, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan.,Department of Molecular Neurology, Graduate School of Medicine, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo, 113-8655, Japan
| | - Kaori Sakuishi
- Department of Neurology, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
| | - Kiyotaka Nakamagoe
- Department of Neurology, Division of Clinical Medicine, Faculty of Medicine, University of Tsukuba, Ibaraki, Japan
| | - Zenshi Miyake
- Department of Neurology, Division of Clinical Medicine, Faculty of Medicine, University of Tsukuba, Ibaraki, Japan
| | - Akira Tamaoka
- Department of Neurology, Division of Clinical Medicine, Faculty of Medicine, University of Tsukuba, Ibaraki, Japan
| | - Jun Goto
- Department of Neurology, International University of Health and Welfare Mita Hospital, Tokyo, Japan
| | - Jun Yoshimura
- Department of Computational Biology and Medical Sciences, Graduate School of Frontier Sciences, The University of Tokyo, Chiba, Japan
| | - Koichiro Doi
- School of Bioscience and Biotechnology, Tokyo University of Technology, Tokyo, Japan
| | - Shinichi Morishita
- Department of Computational Biology and Medical Sciences, Graduate School of Frontier Sciences, The University of Tokyo, Chiba, Japan
| | - Tatsushi Toda
- Department of Neurology, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
| | - Shoji Tsuji
- Department of Molecular Neurology, Graduate School of Medicine, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo, 113-8655, Japan. .,Institute of Medical Genomics, International University of Health and Welfare, Chiba, Japan.
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Miyake Z, Nakamagoe K, Yoshida K, Kondo T, Tamaoka A. Deferasirox Might Be Effective for Microcytic Anemia and Neurological Symptoms Associated with Aceruloplasminemia: A Case Report and Review of the Literature. Intern Med 2020; 59:1755-1761. [PMID: 32238721 PMCID: PMC7434547 DOI: 10.2169/internalmedicine.4178-19] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [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: 11/20/2022] Open
Abstract
The patient was a 64-year-old man presented with difficulty in walking, articulation, and swallowing, as well as cognitive impairment. He had refractory microcytic anemia and diabetes mellitus. His serum levels of iron, copper, and ceruloplasmin were low. Magnetic resonance imaging suggested iron deposition in the basal ganglia, thalami, cerebellar dentate nuclei, and cerebral and cerebellar cortices. He was diagnosed with aceruloplasminemia after a ceruloplasmin gene analysis. Iron chelation therapy with deferasirox improved his anemia and cerebellar symptoms, which included dysarthria and limb ataxia. The present study and previous reports indicate that cerebellar symptoms with aceruloplasminemia might respond to deferasirox in less than one year.
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Affiliation(s)
- Zenshi Miyake
- Department of Neurology, Faculty of Medicine, University of Tsukuba, Japan
| | - Kiyotaka Nakamagoe
- Department of Neurology, Faculty of Medicine, University of Tsukuba, Japan
| | - Kunihiro Yoshida
- Division of Neurogenetics, Department of Brain Research, Shinshu University School of Medicine, Japan
| | - Tadashi Kondo
- Department of Digestive Surgery, Faculty of Medicine, University of Tsukuba, Japan
| | - Akira Tamaoka
- Department of Neurology, Faculty of Medicine, University of Tsukuba, Japan
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Nohara S, Ishii A, Yamamoto F, Yanagiha K, Moriyama T, Tozaka N, Miyake Z, Yatsuga S, Koga Y, Hosaka T, Terada M, Yamaguchi T, Aizawa S, Mamada N, Tsuji H, Tomidokoro Y, Nakamagoe K, Ishii K, Watanabe M, Tamaoka A. GDF-15, a mitochondrial disease biomarker, is associated with the severity of multiple sclerosis. J Neurol Sci 2019; 405:116429. [PMID: 31476622 DOI: 10.1016/j.jns.2019.116429] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [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: 02/02/2019] [Revised: 08/14/2019] [Accepted: 08/14/2019] [Indexed: 01/08/2023]
Abstract
GDF-15, a member of the transforming growth factor beta superfamily, regulates inflammatory and apoptotic pathways in various diseases, such as heart failure, kidney dysfunction, and cancer. We aimed to clarify potentially confounding variables affecting GDF-15 and demonstrate its utility as a mitochondrial biomarker using serum samples from 15 patients with mitochondrial diseases (MD), 15 patients with limbic encephalitis (LE), 10 patients with multiple sclerosis/neuromyelitis optica spectrum disorders (MS/NMOSD), and 19 patients with amyotrophic lateral sclerosis (ALS). GDF-15 and FGF-21 were significantly elevated in MD. GDF-15 and FGF-21 showed a good correlation in MD but not in LE, MS, and ALS. GDF-15 was potentially influenced by age in LE, MS/NMOSD, and ALS but not in MD. FGF-21 was not correlated with age in MS/NMOSD, ALS, LE, and MD. GDF-15 was not correlated with clinical features in LE or BMI or body weight in ALS. GDF-15 positively correlated with the Expanded Disability Status Scale (EDSS) in MS/NMOSD, while EDSS showed no correlation with age. In conclusion, the results revealed that GDF-15 may be influenced by EDSS in MS/NMOPSD and by age in LE, MS/NMOSD, and ALS but not in MD. Mitochondrial damage in MS/NMOSD is a potentially confounding variable affecting GDF-15.
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Affiliation(s)
| | - Akiko Ishii
- Department of Neurology, University of Tsukuba, Japan.
| | | | - Kumi Yanagiha
- Department of Neurology, University of Tsukuba, Japan
| | | | - Naoki Tozaka
- Department of Neurology, University of Tsukuba, Japan
| | - Zenshi Miyake
- Department of Neurology, University of Tsukuba, Japan
| | - Shuichi Yatsuga
- Department of Pediatrics and Child Health, Kurume University School of Medicine, Japan
| | - Yasutoshi Koga
- Department of Pediatrics and Child Health, Kurume University School of Medicine, Japan
| | | | - Makoto Terada
- Department of Neurology, University of Tsukuba, Japan
| | | | | | - Naomi Mamada
- Department of Neurology, University of Tsukuba, Japan
| | - Hiroshi Tsuji
- Department of Neurology, University of Tsukuba, Japan
| | | | | | | | | | - Akira Tamaoka
- Department of Neurology, University of Tsukuba, Japan
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Abstract
RATIONALE Neurological complications of varicella-zoster virus (VZV) infection include cerebral infarction, meningoencephalitis, segmental sensory disturbance, facial nerve palsy, and myelitis. Chronic myelitis is rarely reported. Diagnosis of VZV infection can be confirmed by elevated anti-VZV immunoglobulin G (IgG) antibody or detection of VZV DNA in the cerebrospinal fluid (CSF), the former reported to be superior. The detection rate of VZV DNA is generally thought to decrease with time after the onset of the condition. The utility of VZV DNA polymerase chain reaction (PCR) is thus thought to be limited to the acute phase of the disease. The presence of skin lesions also helps to render a diagnosis; however, cases of zoster sine herpete (ZSH), the occurrence of segmental symptoms without skin lesions, renders the diagnosis of VZV infection more difficult. Antiviral drugs, such as acyclovir, are the treatment of choice to resolve VZV infections. PATIENT CONCERNS A 65-year-old Japanese man felt heaviness and a throbbing pain on the ulnar side of the right forearm. He was previously diagnosed with cervical spondylosis, and received nonsteroidal anti-inflammatory drugs with little improvement. Contrast cervical magnetic resonance imaging showed a swelling and an increased signal intensity of the spinal cord, and an enhancing lesion, all of which were suggestive of myelitis. DIAGNOSIS We found no evidence for diagnoses of sarcoidosis, Behçet disease, multiple sclerosis, or neuromyelitis optica spectrum disorder. The CSF analysis revealed an elevation of the total protein concentration and that the patient was positive for VZV DNA, while anti-VZV IgG was not elevated. The patient was therefore diagnosed with ZSH myelitis. INTERVENTIONS We administered acyclovir and valaciclovir as the first therapy. At the time of recurrence, we used high-dose acyclovir, vidarabine, and high-dose methylprednisolone pulse therapy. OUTCOMES The patient's dysesthetic pain in the right upper limb improved following the first antiviral therapy. Two months later, he suffered a recurrence, but the second therapy significantly relieved his symptoms. LESSONS VZV infection should be regarded as an important differential diagnosis of chronic myelitis. VZV DNA PCR should be performed even in the chronic phase of the condition to introduce the possibility of antiviral therapy as a treatment option.
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Miyake Z, Nakamagoe K, Ezawa N, Yoshinaga T, Hashimoto R, Sato T, Sekijima Y, Tamaoka A. Late-onset Transthyretin (TTR)-familial Amyloid Polyneuropathy (FAP) with a Long Disease Duration from Non-endemic Areas in Japan. Intern Med 2019; 58:713-718. [PMID: 30333406 PMCID: PMC6443558 DOI: 10.2169/internalmedicine.1457-18] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [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: 12/02/2022] Open
Abstract
We herein report the case of an 84-year-old woman with transthyretin (TTR) Val30Met-associated familial amyloid polyneuropathy (FAP-ATTR Val30Met), representing a very old case. The patient had muscle weakness and sensory disturbances in her extremities caused by severe peripheral neuropathy. She also had vitreous opacity and orthostatic hypotension, and pyrophosphate scintigraphy showed a myocardial accumulation. Esophagogastroduodenoscopy revealed mucosal amyloid deposits, positive in anti-TTR antibody staining. A TTR gene analysis isolated the Val30Met mutation. More than a few cases of FAP-ATTR develop late, like our own, and their familial histories are often obscure in non-endemic areas, which might make a diagnosis difficult.
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Affiliation(s)
- Zenshi Miyake
- Department of Neurology, University of Tsukuba Hospital, Japan
| | - Kiyotaka Nakamagoe
- Department of Neurology, Faculty of Medicine, University of Tsukuba, Japan
| | - Naoki Ezawa
- Department of Medicine (Neurology and Rheumatology), Shinshu University School of Medicine, Japan
| | - Tsuneaki Yoshinaga
- Department of Medicine (Neurology and Rheumatology), Shinshu University School of Medicine, Japan
| | | | - Taiki Sato
- Department of Diagnostic Pathology, Faculty of Medicine, University of Tsukuba, Japan
| | - Yoshiki Sekijima
- Department of Medicine (Neurology and Rheumatology), Shinshu University School of Medicine, Japan
| | - Akira Tamaoka
- Department of Neurology, Faculty of Medicine, University of Tsukuba, Japan
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Miyake Z, Tomidokoro Y, Tsurubuchi T, Matsumura A, Sakamoto N, Noguchi M, Tamaoka A. Intravascular large B-cell lymphoma presenting with hearing loss and dizziness: A case report. Medicine (Baltimore) 2019; 98:e14470. [PMID: 30762766 PMCID: PMC6407998 DOI: 10.1097/md.0000000000014470] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [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: 12/04/2022] Open
Abstract
RATIONALE Intravascular large B-cell lymphoma (IVLBCL) is a type of malignant lymphoma in which neoplastic B cells proliferate selectively within the lumina of small- and medium-sized vessels. Patients with IVLBCL frequently develop neurological manifestations during their disease course. Patients are known to often develop various neurological manifestations, but there are only a few reports of IVLBCL whose initial symptoms are deafness and/or disequilibrium. PATIENT CONCERNS A 66-year-old Japanese man was provisionally diagnosed with sudden sensorineural hearing loss. Administration of prednisolone did not improve his symptoms, and then he experienced amaurosis fugax. Magnetic resonance imaging (MRI) showed multiple brain infarcts, so he was administered antithrombotic drugs. Nevertheless, he experienced recurrent strokes, became irritable, and had visual hallucinations. He was emergently admitted to our hospital with disturbance of consciousness. DIAGNOSIS Blood tests showed elevation of lactose dehydrogenase and soluble interleukin-2 receptor. Cranial MR diffusion-weighted imaging showed multiple lesions bilaterally in the cerebral white matter and cortex, posterior limbs of the internal capsule, and cerebellar hemispheres, which were hypointense on apparent diffusion coefficient maps. Hyperintense lesions were detected bilaterally in the cerebral white matter and basal ganglia on both T2-weighted imaging and fluid-attenuated inversion recovery imaging. Contrast-enhanced brain MRI demonstrated contrast-enhancing high-signal lesions along the cerebral cortex. Brain biopsy revealed a diagnosis of IVLBCL. INTERVENTIONS The patient could not receive chemotherapy because of his poor general condition. Therefore, we administered high-dose methylprednisolone (mPSL) pulse therapy. OUTCOMES There was little improvement in consciousness levels after the high-dose mPSL pulse therapy. On the forty-ninth day of hospitalization, he was transferred to another hospital to receive supportive care. LESSONS IVLBCL should be regarded as an important differential diagnosis of hearing loss and dizziness. Most importantly, if the symptoms are fluctuant and steroid therapy is not effective, biopsy should be considered as early as possible.
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Affiliation(s)
| | | | | | | | - Noriaki Sakamoto
- Department of Diagnostic Pathology, Division of Clinical Medicine, Faculty of Medicine, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki, Japan
| | - Masayuki Noguchi
- Department of Diagnostic Pathology, Division of Clinical Medicine, Faculty of Medicine, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki, Japan
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Nakamagoe K, Yanagiha H, Miyake Z, Kondo Y, Hiyama T, Ishii A, Kaji Y, Oshika T, Sumida T, Tamaoka A. Monocular Oculomotor Nerve Disorder Manifesting as Cranial Neuropathy in Systemic Lupus Erythematosus. Intern Med 2018; 57:3445-3449. [PMID: 29984768 PMCID: PMC6306525 DOI: 10.2169/internalmedicine.1106-18] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [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: 01/09/2023] Open
Abstract
We herein report the case of a patient who developed peripheral neuropathy of the bilateral lower legs that later became complicated with isolated oculomotor nerve disorder and was finally diagnosed as systemic lupus erythematosus (SLE). Based on the findings for oculomotor nerve paralysis and contrast-enhanced magnetic resonance imaging findings for the oculomotor nerve in the prepontine cistern, the isolated oculomotor nerve disorder was considered to be a manifestation of peripheral neuropathy. This oculomotor nerve disorder may contribute to the diagnosis of SLE and can be effectively treated with steroid pulse therapy. Reports of SLE manifesting as isolated oculomotor nerve paralysis are rare.
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Affiliation(s)
- Kiyotaka Nakamagoe
- Department of Neurology, Division of Clinical Medicine, Faculty of Medicine, University of Tsukuba, Japan
| | - Hisami Yanagiha
- Department of Internal Medicine, Iwaki Kyoritsu Hospital, Japan
| | - Zenshi Miyake
- Department of Neurology, University of Tsukuba Hospital, Japan
| | - Yuya Kondo
- Department of Rheumatology, Division of Clinical Medicine, Faculty of Medicine, University of Tsukuba, Japan
| | - Takashi Hiyama
- Department of Radiology, University of Tsukuba Hospital, Japan
| | - Akiko Ishii
- Department of Neurology, Division of Clinical Medicine, Faculty of Medicine, University of Tsukuba, Japan
| | - Yuichi Kaji
- Department of Ophthalmology, Division of Clinical Medicine, Faculty of Medicine, University of Tsukuba, Japan
| | - Tetsuro Oshika
- Department of Ophthalmology, Division of Clinical Medicine, Faculty of Medicine, University of Tsukuba, Japan
| | - Takayuki Sumida
- Department of Rheumatology, Division of Clinical Medicine, Faculty of Medicine, University of Tsukuba, Japan
| | - Akira Tamaoka
- Department of Neurology, Division of Clinical Medicine, Faculty of Medicine, University of Tsukuba, Japan
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Abstract
RATIONALE Antiepileptic drugs (AEDs) are one of the causative drugs of drug-induced hypothyroidism. In most cases, AED-induced hypothyroidism is subclinical and indicated only by abnormalities of free thyroxine (T4) and/or thyroid-stimulating hormone (TSH) levels. Severe symptomatic hypothyroidism following AEDs is rarely reported in the literature. PATIENT CONCERNS A 75-year-old man experienced neurologic symptoms including memory impairment, ataxic gait, sensory polyneuropathy and myopathy, lethargy, and edema of the face and lower extremities. He had been administered phenytoin and gabapentin for the treatment of symptomatic traumatic epilepsy 8 years before. DIAGNOSES The patient had low free T4 (0.21 ng/dL) and high TSH (113.2 μIU/mL), which indicated hypothyroidism. Negative thyroid-related autoantibody tests and the lack of goiter excluded the possibility of Hashimoto disease. Phenytoin and/or gabapentin were strongly suspected as causing his hypothyroidism. INTERVENTION The patient was treated with replacement therapy (levothyroxine 25 μg/day). OUTCOMES His symptoms markedly and promptly improved alongside continued antiepileptic therapy. LESSONS In this case, the patient's hypothyroidism was assumed to result from different mechanisms of the 2 AEDs leading to thyroid hormone reduction. AEDs can not only cause asymptomatic thyroid hormone abnormalities but also clinically observable hypothyroidism. Therefore, clinicians should be aware of the association between anticonvulsants and symptomatic hypothyroidism.
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Miyake Z, Ishii K, Matsuo H, Higuchi O, Tamaoka A. Isolated bilateral abducens paralysis without ptosis in an anti-LDL receptor-related protein 4 antibody-positive patient treated effectively with steroid-pulse therapy. J Neurol Sci 2018; 390:42-43. [PMID: 29801905 DOI: 10.1016/j.jns.2018.04.007] [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: 03/05/2018] [Revised: 03/27/2018] [Accepted: 04/04/2018] [Indexed: 11/28/2022]
Affiliation(s)
- Zenshi Miyake
- Department of Neurology, Faculty of Medicine, University of Tsukuba, 1-1-1, Tennnoudai, Tsukuba, Ibaraki 305-8575, Japan
| | - Kazuhiro Ishii
- Department of Neurology, Faculty of Medicine, University of Tsukuba, 1-1-1, Tennnoudai, Tsukuba, Ibaraki 305-8575, Japan.
| | - Hidenori Matsuo
- Department of Neurology, Nagasaki Kawatana Medical Center, 2005-1, Shimogumi-go, Kawatana-cho, Higashisonogi-gun, Nagasaki 859-3615, Japan
| | - Osamu Higuchi
- Department of Clinical Research, Nagasaki Kawatana Medical Center, 2005-1, Shimogumi-go, Kawatana-cho, Higashisonogi-gun, Nagasaki 859-3615, Japan
| | - Akira Tamaoka
- Department of Neurology, Faculty of Medicine, University of Tsukuba, 1-1-1, Tennnoudai, Tsukuba, Ibaraki 305-8575, Japan
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Takeda H, Ishii A, Nohara S, Tozaka N, Miyake Z, Okune S, Tsuji H, Tomidokoro Y, Nakamagoe K, Watanabe M, Ishii K, Tamaoka A. Lambert-Eaton myasthenic syndrome; Report of two cases. J Neurol Sci 2017. [DOI: 10.1016/j.jns.2017.08.1859] [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: 11/24/2022]
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Ishii A, Ishii A, Nohara S, Yanagiha K, Moriyama T, Tozaka N, Miyake Z, Okune S, Tsuji H, Tomidokoro Y, Nakamagoe K, Ishii K, Watanabe M, Tamaoka A, Yatsuga S, Koga Y. GDF-15 expression in multiple sclerosis and limbic encephalitis. J Neurol Sci 2017. [DOI: 10.1016/j.jns.2017.08.3523] [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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Nakamagoe K, Kadono K, Koganezawa T, Takiguchi M, Terada M, Yamamoto F, Moriyama T, Yanagiha K, Nohara S, Tozaka N, Miyake Z, Aizawa S, Furusho K, Tamaoka A. Vestibular Impairment in Frontotemporal Dementia Syndrome. Dement Geriatr Cogn Dis Extra 2016; 6:194-204. [PMID: 27350780 PMCID: PMC4913767 DOI: 10.1159/000445870] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [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] [Indexed: 12/05/2022] Open
Abstract
Background No studies to date have attempted to evaluate frontotemporal lobar degeneration from the perspective of the vestibular system. Objective The present study examined vestibular function in patients with frontotemporal dementia (FTD) clinical syndrome and evaluated whether vestibular disorders are involved in the clinical symptoms due to FTD. Methods Fourteen patients with FTD syndrome, as well as healthy elderly controls without dementia, were included in the present study. All subjects underwent vestibular function tests using electronystagmography, such as caloric tests and visual suppression (VS) tests, in which the induced caloric nystagmus was suppressed by visual stimuli. The association between clinical symptoms and vestibular function in the FTD syndrome group was further examined. Results In the FTD syndrome group, caloric nystagmus was not necessarily suppressed during VS tests. Furthermore, VS was observed to be significantly impaired in FTD syndrome patients with gait disturbance as compared to those without such disturbance. Conclusion The present study revealed that impairment of VS in patients with FTD results in an inability to regulate vestibular function by means of visual perception, regardless of multiple presumed neuropathological backgrounds. This could also be associated with gait disturbance in patients with FTD syndrome.
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Affiliation(s)
- Kiyotaka Nakamagoe
- Department of Neurology, Division of Clinical Medicine, University of Tsukuba, Tsukuba, Japan
| | - Kotarou Kadono
- Department of Neurology, Division of Clinical Medicine, University of Tsukuba, Tsukuba, Japan
| | - Tadachika Koganezawa
- Department of Physiology, Division of Biomedical Science, Faculty of Medicine, University of Tsukuba, Tsukuba, Japan
| | - Mao Takiguchi
- Department of Neurology, Division of Clinical Medicine, University of Tsukuba, Tsukuba, Japan
| | - Makoto Terada
- Department of Neurology, Division of Clinical Medicine, University of Tsukuba, Tsukuba, Japan
| | - Fumiko Yamamoto
- Department of Neurology, Division of Clinical Medicine, University of Tsukuba, Tsukuba, Japan
| | - Tetsuya Moriyama
- Department of Neurology, Division of Clinical Medicine, University of Tsukuba, Tsukuba, Japan
| | - Kumi Yanagiha
- Department of Neurology, Division of Clinical Medicine, University of Tsukuba, Tsukuba, Japan
| | - Seitaro Nohara
- Department of Neurology, Division of Clinical Medicine, University of Tsukuba, Tsukuba, Japan
| | - Naoki Tozaka
- Department of Neurology, Division of Clinical Medicine, University of Tsukuba, Tsukuba, Japan
| | - Zenshi Miyake
- Department of Neurology, Division of Clinical Medicine, University of Tsukuba, Tsukuba, Japan
| | - Satoshi Aizawa
- Department of Neurology, Division of Clinical Medicine, University of Tsukuba, Tsukuba, Japan
| | - Kentaro Furusho
- Department of Neurology, Ryugasaki Saiseikai Hospital, Ryugasaki, Japan
| | - Akira Tamaoka
- Department of Neurology, Division of Clinical Medicine, University of Tsukuba, Tsukuba, Japan
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Miyake Z, Takekawa M, Ge Q, Saito H. Activation of MTK1/MEKK4 by GADD45 through induced N-C dissociation and dimerization-mediated trans autophosphorylation of the MTK1 kinase domain. Mol Cell Biol 2007; 27:2765-76. [PMID: 17242196 PMCID: PMC1899887 DOI: 10.1128/mcb.01435-06] [Citation(s) in RCA: 92] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2006] [Revised: 10/03/2006] [Accepted: 01/09/2007] [Indexed: 11/20/2022] Open
Abstract
The mitogen-activated protein kinase (MAPK) module, composed of a MAPK, a MAPK kinase (MAPKK), and a MAPKK kinase (MAPKKK), is a cellular signaling device that is conserved throughout the eukaryotic world. In mammalian cells, various extracellular stresses activate two major subfamilies of MAPKs, namely, the Jun N-terminal kinases and the p38/stress-activated MAPK (SAPK). MTK1 (also called MEKK4) is a stress-responsive MAPKKK that is bound to and activated by the stress-inducible GADD45 family of proteins (GADD45alpha/beta/gamma). Here, we dissected the molecular mechanism of MTK1 activation by GADD45 proteins. The MTK1 N terminus bound to its C-terminal segment, thereby inhibiting the C-terminal kinase domain. This N-C interaction was disrupted by the binding of GADD45 to the MTK1 N-terminal GADD45-binding site. GADD45 binding also induced MTK1 dimerization via a dimerization domain containing a coiled-coil motif, which is essential for the trans autophosphorylation of MTK1 at Thr-1493 in the kinase activation loop. An MTK1 alanine substitution mutant at Thr-1493 has a severely reduced activity. Thus, we conclude that GADD45 binding induces MTK1 N-C dissociation, dimerization, and autophosphorylation at Thr-1493, leading to the activation of the kinase catalytic domain. Constitutively active MTK1 mutants induced the same events, but in the absence of GADD45.
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Affiliation(s)
- Zenshi Miyake
- Institute of Medical Sciences, The University of Tokyo, 4-6-1 Shirokanedai, Minato-ku, Tokyo 108-8639, Japan
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