中原 仁 ( ナカハラ ジン )

NAKAHARA Jin

写真a

所属(所属キャンパス)

医学部 内科学教室(神経) Department of Neurology, Keio University School of Medicine ( 信濃町 )

職名

教授

HP

外部リンク

プロフィール 【 表示 / 非表示

  • ・日本神経学会 代議員ほか
    ・日本内科学会 評議員ほか
    ・日本神経免疫学会 理事ほか
    ・日本神経治療学会 評議員
    ・日本神経感染症学会 評議員
    ・日本多発性硬化症ネットワーク 理事
    ・日本微小循環学会 理事
    ・環アジア多発性硬化症治療研究会議(PACTRIMS)理事
    ・米国神経学会(AAN)FAAN
    ・欧州神経学会(EAN)Corresponding Member

教員からのメッセージ 【 表示 / 非表示

  • 神経内科領域のあらゆる疾患を対象に、先進的なトランスレーショナル・リサーチから在宅医療まで、手段を問わず患者の生命の質(quality of life)を改善させる治療の具現化に向けた研究を行っている。

その他の所属・職名 【 表示 / 非表示

  • 金沢大学 客員教授

  • 東京慈恵会医科大学 客員教授

  • 慶應義塾大学神経難病iPS細胞研究センター センター長

  • 慶應義塾大学病院脳卒中センター 副センター長

経歴 【 表示 / 非表示

  • 2003年04月
    -
    2004年03月

    慶應義塾大学 COE研究員

  • 2004年04月
    -
    2007年03月

    独立行政法人日本学術振興会 特別研究員(DC1)

  • 2007年04月
    -
    2008年11月

    独立行政法人日本学術振興会 特別研究員(PD)

  • 2008年12月
    -
    2013年03月

    慶應義塾大学 特任講師(医学部総合医科学研究センター)

  • 2013年04月
    -
    2018年03月

    慶應義塾大学 助教(医学部内科学(神経))

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学歴 【 表示 / 非表示

  • 2003年03月

    慶應義塾大学, 医学部

    大学, 卒業

  • 2007年03月

    慶應義塾大学, 医学研究科, 生理系専攻

    大学院, 修了, 博士

学位 【 表示 / 非表示

  • 博士(医学), 慶應義塾大学, 課程, 2007年03月

免許・資格 【 表示 / 非表示

  • 日本国 医師免許証, 2003年05月

  • 日本医師会 認定産業医, 2011年09月

  • 日本内科学会 認定内科医, 2013年09月

  • 日本神経学会 神経内科専門医, 2014年07月

  • 日本内科学会 内科指導医, 2017年09月

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研究分野 【 表示 / 非表示

  • ライフサイエンス / 神経内科学

研究キーワード 【 表示 / 非表示

  • オリゴデンドロサイト

  • 多発性硬化症

  • 神経免疫学

  • 神経内科学

  • 視神経脊髄炎関連疾患

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研究テーマ 【 表示 / 非表示

  • 神経治療学の拠点形成, 

    2018年
    -
    継続中

  • 多発性硬化症の臨床研究, 

    2011年
    -
    継続中

  • 中枢神経系髄鞘再生療法の開発, 

    1999年
    -
    継続中

 

著書 【 表示 / 非表示

  • Visualization of Myelin for the Diagnosis and Treatment Monitoring of Multiple Sclerosis

    Nakahara J., Advances in Experimental Medicine and Biology, 2019年

     概要を見る

    Multiple sclerosis (MS) is a demyelinating disease of the central nervous system (CNS) affecting more than two million people worldwide. As the exact etiology of MS remains elusive, the diagnosis of MS is made by referring to the McDonald diagnostic criteria, which utilizes MRI as a tool to identify “demyelinated” MS lesions. In particular, hyperintense lesions on T2-weighted images (T2WI) or so-called “T2-lesions” are considered to represent demyelinated MS lesions. T2WI, however, lacks myelin specificity, and moreover, remyelination could not be depicted by the use of such modality. For the accurate diagnosis and treatment decision-making, or for the future development of remyelination therapeutics, imaging tools to visualize myelin-specific signals are mandatory. In this chapter, the current use and the limitation of imaging modalities in MS diagnosis and treatment will be reviewed, with the introduction of new imaging method, namely q-space Myelin Map (qMM), to be used for visualization of demyelination and remyelination in MS.

論文 【 表示 / 非表示

  • A case of CD36 deficiency with multiple white matter lesions

    Kizuka Y., Yamakawa H., Iwabuchi Y., Sakai J., Terayama C., Yatabe Y., Arai T., Matsushita H., Ieda M., Nakahara J., Izawa Y.

    BMC Neurology 26 ( 1 )  2026年12月

     概要を見る

    Background: CD36 deficiency is associated with abnormal fatty acid metabolism, which may increase the risk of developing atherosclerosis. However, there are few reports on a possible link between CD36 deficiency and cerebral white matter lesions. Case report: We present the case of a 44-year-old woman with heart failure due to CD36 deficiency and multiple white matter lesions. Her comprehensive examination for heart failure, including a single-photon emission computed tomography (SPECT) with <sup>201</sup>thallium and <sup>123</sup>I-β-methyl-p-iodophenyl pentadecanoic acid, revealed a fatty acid metabolism disorder in the myocardium. Flow cytometry confirmed CD36 deficiency, and a subsequent head magnetic resonance imaging (MRI) demonstrated multiple T2-hyperintense lesions in the cerebral white matter. Although the patient had hypertriglyceridemia and a history of smoking, the contribution of CD36 deficiency to the formation of white matter lesions remains unclear. Conclusion: This case suggests a potential association between CD36 deficiency and cerebral small-vessel disease. Further studies in patient cohorts with CD36 deficiency are warranted to clarify the impact of this condition on cerebral microcirculation.

  • Iba1 deficiency impairs microglial synaptic remodeling and neuronal survival after axonal injury

    Sekiguchi K., Shoji H., Shindo T., Sasabe J., Tokuyasu D., Nakahara J., Miyakawa T., Ito D.

    Journal of Neuroinflammation 23 ( 1 )  2026年12月

     概要を見る

    Background: Microglia remodel neuronal circuits in pathological conditions; however, the molecular requirements for these responses and their consequences for motoneuron survival remain unclear. Methods: Aif1 (Iba1) knockout mice were generated using CRISPR/Cas9-mediated deletion, and baseline phenotypes and responses to unilateral facial nerve axotomy were assessed using immunohistochemistry, transmission electron microscopy, and single-nucleus RNA sequencing of the facial motor nucleus. Motoneuron survival and nuclear γH2AX foci were evaluated 28 days post-axotomy. Findings: Under baseline conditions, Iba1<sup>−/−</sup> mice had reduced body weights and mild behavioral abnormalities compared to wild-type mice. After axotomy, microglial ensheathment of ChAT-positive facial motoneurons was reduced, with fewer neurons showing extensive perisomatic microglial coverage than in Iba1<sup>+/+</sup> mice. Ultrastructurally, somatic synapse loss observed after injury in wild-type mice was not detected in Iba1<sup>−/−</sup> mice, and fewer injured motoneurons were in contact with microglial processes. Single-nucleus transcriptomics showed an exaggerated expansion of an interferon-responsive microglial state in Iba1−/− mice after axotomy, whereas injured motoneurons displayed altered transcriptional programs related to synapse organization and neurotransmission. At 28 days, Iba1−/− mice showed reduced motoneuron survival, lower ChAT expression, and increased nuclear γH2AX foci. Interpretation: Iba1 supports microglia-neuron cross-talk that enables effective perisomatic remodefling after axonal injury; disruption of this response is accompanied by inflammatory-state shifts and compromised motoneuron survival.

  • Differential impact of smoking on intracerebral haemorrhage based on cerebral microbleed status: a case-control study

    Kuroda T., Tanaka T., Saito S., Bhaskar S., Ishiyama H., Inui R., Shiomi Y., Nakaoku Y., Ogata S., Morita Y., Ozaki E., Kuriyama N., Nishimura K., Koga M., Nakahara J., Toyoda K., Ihara M.

    BMJ Open 16 ( 6 )  2026年06月

     概要を見る

    Objectives: While smoking is a well-established risk factor for various cardiovascular diseases, its association with intracerebral haemorrhage (ICH) remains controversial. Cerebral microbleeds (CMBs) are markers of haemorrhage-prone small vessel disease, but ICH can also occur without detectable CMBs. Therefore, we investigated the association between smoking and ICH according to CMB status. Design: Single-centre retrospective case-control study. Setting: A tertiary stroke centre in Osaka, Japan (2017–2021). Participants: 487 patients with ICH as their first stroke (female sex 41.5%) and 322 controls with non-stroke neurological conditions (female sex 47.5%) were included. Patients with missing CMB evaluation or smoking status data were excluded. Primary and secondary outcome measures: The primary outcome was ICH status, analysed according to CMB status, with current smoking as the primary exposure. Secondary analyses evaluated the association between smoking cessation duration and the odds of ICH, using current smoking as the reference. Results: Patients with ICH (median age, 70.0 years; presence of CMBs, 53.6%) and controls (median age, 71.0 years; presence of CMBs, 13.4%) were analysed. Among individuals without CMBs, current smoking was more frequently observed in patients with ICH than in controls (25.7% vs 14.0%, p<0.001) and was independently associated with ICH following adjustment for potential confounders (adjusted OR (aOR) 1.84, 95% CI 1.02 to 3.31, p=0.042). Long-term smoking cessation (>10 years) was associated with lower odds of ICH than current smoking (aOR 0.31, 95% CI 0.14 to 0.67, p=0.003), whereas short-term cessation (≤10 years) showed no significant difference. Among individuals with CMBs, no significant association was observed between smoking status and ICH. Conclusions: Current smoking was associated with higher odds of ICH among individuals without CMBs, whereas long-term cessation was associated with lower odds. These findings suggest that the absence of CMBs should not be interpreted as the absence of modifiable ICH risk, highlighting the clinical relevance of smoking history in this population. Trial registration number: NCT02251665.

  • Impact of Basal Ganglia Perivascular Spaces on Ischemic and Hemorrhagic Risks in Patients Taking Antithrombotic Therapies

    Iwamoto S., Miwa K., Koga M., Yoshimura S., Tanaka K., Yakushiji Y., Sasaki M., Hoshino H., Shiozawa M., Yagita Y., Kudo K., Nagakane Y., Ihara M., Nishiyama K., Nakahara J., Hirano T., Toyoda K.

    Neurology 106 ( 7 )  2026年04月

    ISSN  00283878

     概要を見る

    BACKGROUND AND OBJECTIVES: Enlarged perivascular spaces (ePVSs) are considered to increase the risk of stroke. However, data regarding the benefits and risks of antithrombotic therapy in patients with ePVSs are currently limited. This study assessed the association between ePVSs and the risks of hemorrhagic or ischemic events in patients taking antithrombotic agents. METHODS: This prospective, multicenter observational study enrolled patients with cerebrovascular or cardiovascular diseases who had newly started or were continuing to take oral antithrombotic agents at 52 hospitals across Japan between 2016 and 2019. Baseline multimodal MRI was performed for all of the study participants. The images were then centrally evaluated for cerebral small vessel disease (SVD), including white matter hyperintensities, cerebral microbleeds, lacunes, and basal ganglia-enlarged perivascular spaces (BGPVSs). BGPVSs were categorized as 0, 1-10, 11-20, or ≥21. Outcomes included major bleeding, intracranial hemorrhage, ischemic events, ischemic stroke, and mortality. Multivariable Cox proportional hazards models were used for the BGPVSs (in categorical and ordinal forms), adjusted for patient demographics, vascular risk factors, and other SVD markers. RESULTS: Of the total 5,065 patients (1,663 women; median age 74 [interquartile range 67-81] years), antiplatelets and anticoagulants were administered at the baseline to 3,820 (75.4%) and 1,502 (29.7%) patients, respectively. Their BGPVS distributions were as follows: 0, 475 (9.4%); 1-10, 2,615 (51.6%); 11-20, 1,267 (25.0%); and 21+, 708 patients (14.0%). Over a median follow-up period of 2.0 (interquartile range 1.8-2.0) years, we noted 266 ischemic events, 188 ischemic strokes, 92 major bleeding events, 54 intracranial hemorrhages, and 198 deaths. Higher BGPVS was associated with an increased risk of major bleeding (BGPVS ≥21: adjusted hazard ratio [aHR] 4.04, 95% CI 1.17-13.92; per-unit increase: aHR 1.38, 95% CI 1.07-1.77) and ischemic stroke (BGPVS ≥21: aHR 2.58, 95% CI 1.21-5.50; per-unit increase: aHR 1.28, 95% CI 1.07-1.53) but was not significantly associated with higher risks of ischemic events, intracranial hemorrhage, or mortality. DISCUSSION: Higher BGPVS burdens are associated with higher risks of ischemic stroke and major bleeding in patients receiving antithrombotic therapy. BGPVSs may serve as useful imaging biomarkers for vascular risk assessment and personalized therapy.

  • Long-term efficacy and disease-specific responsiveness to protirelin in patients with spinocerebellar degeneration: A retrospective study

    Okusa S., Tezuka T., Nakahara J., Seki M.

    Parkinsonism and Related Disorders 145 2026年04月

    ISSN  13538020

     概要を見る

    Introduction: The thyrotropin-releasing hormone (TRH) analog protirelin has short-term benefits for cerebellar ataxia (CA), but its long-term efficacy and the subtype-specific responsiveness of spinocerebellar degeneration (SCD) patients remain unclear. Methods: We retrospectively reviewed the records of 92 SCD patients (273 courses) treated with protirelin between July 2011 and October 2025, including patients with idiopathic CA (IDCA), multiple system atrophy with predominant CA (MSA-C) or parkinsonism (MSA-P), and genetic subtypes including spinocerebellar ataxia (SCA) type 6, SCA31 and dentatorubral-pallidoluysian atrophy (DRPLA). Responders were defined as showing ≥1-point improvement on the Scale for the Assessment and Rating of Ataxia (SARA). Results: Protirelin was effective in 64.1% of subjects, with significant improvement overall (p < 0.001) and significant SARA gains in MSA-C (p = 0.047), IDCA (p = 0.02), and SCA31 (p = 0.01). Change in SARA score (ΔSARA) correlated negatively with age and positively with total protirelin dose in IDCA, and negatively with age and disease duration and positively with baseline SARA score in SCA31. Several IDCA and DRPLA patients maintained clinical benefit for more than 10 years. All MSA-P discontinued protirelin within 2 years and all MSA-C within 5 years; some SCA6, and SCA31 patients continued for ≥5 years. Adverse effects were infrequent (2/92, 2.2%). Conclusion: Protirelin is efficacious in SCD patients and well-tolerated, particularly in slow-progressing phenotypes (IDCA and SCA31); its benefit in rapidly progressing ataxias (MSA-C) may be confined to early disease stages. Prospective studies with standardized dosing and long-term follow-up are warranted to establish evidence-based protocols for TRH-related therapy for CA.

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総説・解説等 【 表示 / 非表示

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競争的研究費の研究課題 【 表示 / 非表示

  • 視神経脊髄炎スペクトラム障害のプレシジョンメディシン基盤確立

    2023年04月
    -
    2028年03月

    中原 仁, 基盤研究(B), 補助金,  研究代表者

  • ミエリンマップ法を用いた多発性硬化症における髄鞘病理の画像解析

    2018年04月
    -
    2023年03月

    文部科学省・日本学術振興会, 科学研究費助成事業, 中原 仁, 基盤研究(C), 補助金,  研究代表者

  • 髄鞘の可視化技術による多発性硬化症の病型分類に関する研究

    2013年04月
    -
    2016年03月

    文部科学省, 科学研究費補助金(文部科学省・日本学術振興会), 中原仁, 補助金,  研究代表者

  • 髄鞘を標的とした神経変性疾患・脊髄損傷に対する新規治療戦略に関する研究

    2013年04月
    -
    2016年03月

    文部科学省, 科学研究費補助金(文部科学省・日本学術振興会), 中原仁, 補助金,  研究代表者

  • アストロサイトによるin vivoケトン体生合成機構の解明

    2010年04月
    -
    2013年03月

    文部科学省, 科学研究費補助金(文部科学省・日本学術振興会), 中原仁, 補助金,  研究代表者

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知的財産権等 【 表示 / 非表示

  • Drug delivery system toward demyelinating lesion and biochemical marker of demyelinating lesions

    出願日: 8252540  2012年08月 

    発行日: 8252540  2012年08月

    特許権, 共同

  • Medicinal compositions containing Fc receptor γ chain activator

    出願日: 7901678  2011年03月 

    発行日: 7901678  2011年03月

    特許権, 共同

  • Fc受容体γ鎖活性化物質を含有する医薬組成物

    出願日: 4214249  2008年11月 

    発行日: 4214249  2008年11月

    特許権, 共同

受賞 【 表示 / 非表示

  • Best Presentation賞

    2017年, Sendai Conference

  • MSJ-PACTRIMS investigator award

    2014年, Pan-Asian Committee for Treatment and Research in Multiple Sclerosis (PACTRIMS)

  • 優秀指導教官賞

    2014年, 日本内科学会

  • MSJ-PACTRIMS Investigator賞

    2014年, 環アジア多発性硬化症治療研究会議

  • 優秀指導教官賞

    2014年, 内科学サミット2014

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担当授業科目 【 表示 / 非表示

  • 内科学実習

    2026年度

  • 内科学演習

    2026年度

  • 内科学

    2026年度

  • 内科学特論

    2026年度

  • 神経内科学臨床実習

    2026年度

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所属学協会 【 表示 / 非表示

  • 日本内科学会

     
  • 日本神経学会

     
  • 日本神経免疫学会

     
  • 日本神経治療学会

     
  • 日本脳卒中学会

     

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