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• 2025年04月

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  継続中

  札幌医科大学   医学部附属再生医療学研究所 神経再生学部門   特任講師

• 2024年04月

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  継続中

  イェール大学   医学部神経内科 神経科学部門   訪問研究員

• 2024年04月

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  2025年03月

  札幌医科大学   医学部附属再生医療学研究所 神経再生医療学部門   特任助教

• 2022年09月

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  2024年04月

  イェール大学   Associate Research Scientist

• 2018年09月

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  2021年08月

  イェール大学   Postdoctoral Associate

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• ライフサイエンス   整形外科学  

• ライフサイエンス   脳神経外科学  

• ライフサイエンス   神経科学一般  

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• イェール大学   医学部神経内科　神経科学部門   訪問研究員  

• 札幌医科大学　   医学部附属再生医療学研究所　神経再生学部門   特任講師  

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• Mesenchymal Stem Cells and Their Extracellular Vesicles: Therapeutic Mechanisms for Blood–Spinal Cord Barrier Repair Following Spinal Cord Injury

  Masahito Nakazaki, Takahiro Yokoyama, Karen L. Lankford, Ryosuke Hirota, Jeffery D. Kocsis, Osamu Honmou

  International Journal of Molecular Sciences    2024年12月

  担当区分：   筆頭著者  , 責任著者

  DOI

• Human mesenchymal stem-derived extracellular vesicles improve body growth and motor function following severe spinal cord injury in rat.

  Masahito Nakazaki, Karen L Lankford, Hideaki Yamamoto, Yoshiyuki Mae, Jeffery D Kocsis

  Clinical and translational medicine   13 ( 6 ) e1284  2023年06月  [国際誌]

  担当区分：   筆頭著者

  　概要を見る

  BACKGROUND: Spinal cord injury (SCI) in young adults leads to severe sensorimotor disabilities as well as slowing of growth. Systemic pro-inflammatory cytokines are associated with growth failure and muscle wasting. Here we investigated whether intravenous (IV) delivery of small extracellular vesicles (sEVs) derived from human mesenchymal stem/stromal cells (MSC) has therapeutic effects on body growth and motor recovery and can modulate inflammatory cytokines following severe SCI in young adult rats. METHODS: Contusional SCI rats were randomized into three different treatment groups (human and rat MSC-sEVs and a PBS group) on day 7 post-SCI. Functional motor recovery and body growth were assessed weekly until day 70 post-SCI. Trafficking of sEVs after IV infusions in vivo, the uptake of sEVs in vitro, macrophage phenotype at the lesion and cytokine levels at the lesion, liver and systemic circulation were also evaluated. RESULTS: An IV delivery of both human and rat MSC-sEVs improved functional motor recovery after SCI and restored normal body growth in young adult SCI rats, indicating a broad therapeutic benefit of MSC-sEVs and a lack of species specificity for these effects. Human MSC-sEVs were selectively taken up by M2 macrophages in vivo and in vitro, consistent with our previous observations of rat MSC-sEV uptake. Furthermore, the infusion of human or rat MSC-sEVs resulted in an increase in the proportion of M2 macrophages and a decrease in the production of the pro-inflammatory cytokines tumour necrosis factor-alpha (TNF-α) and interleukin (IL)-6 at the injury site, as well as a reduction in systemic serum levels of TNF-α and IL-6 and an increase in growth hormone receptors and IGF-1 levels in the liver. CONCLUSIONS: Both human and rat MSC-sEVs promote the recovery of body growth and motor function after SCI in young adult rats possibly via the cytokine modulation of growth-related hormonal pathways. Thus, MSC-sEVs affect both metabolic and neurological deficits in SCI.

  DOI PubMed

• Small extracellular vesicles released by infused mesenchymal stromal cells target M2 macrophages and promote TGF-β upregulation, microvascular stabilization and functional recovery in a rodent model of severe spinal cord injury.

  Masahito Nakazaki, Tomonori Morita, Karen L Lankford, Philip W Askenase, Jeffery D Kocsis

  Journal of extracellular vesicles   10 ( 11 ) e12137  2021年09月  [国際誌]

  担当区分：   筆頭著者

  　概要を見る

  Intravenous (IV) infusion of bone marrow-derived mesenchymal stem/stromal cells (MSCs) stabilizes the blood-spinal cord barrier (BSCB) and improves functional recovery in experimental models of spinal cord injury (SCI). Although IV delivered MSCs do not traffic to the injury site, IV delivered small extracellular vesicles (sEVs) derived from MSCs (MSC-sEVs) do and are taken up by a subset of M2 macrophages. To test whether sEVs released by MSCs are responsible for the therapeutic effects of MSCs, we tracked sEVs produced by IV delivered DiR-labelled MSCs (DiR-MSCs) after transplantation into SCI rats. We found that sEVs were released by MSCs in vivo, trafficked to the injury site, associated specifically with M2 macrophages and co-localized with exosome markers. Furthermore, while a single MSC injection was sufficient to improve locomotor recovery, fractionated dosing of MSC-sEVs over 3 days (F-sEVs) was required to achieve similar therapeutic effects. Infusion of F-sEVs mimicked the effects of single dose MSC infusion on multiple parameters including: increased expression of M2 macrophage markers, upregulation of transforming growth factor-beta (TGF-β), TGF-β receptors and tight junction proteins, and reduction in BSCB permeability. These data suggest that release of sEVs by MSCs over time induces a cascade of cellular responses leading to improved functional recovery.

  DOI PubMed

• Intravenous infusion of auto serum-expanded autologous mesenchymal stem cells in spinal cord injury patients: 13 case series.

  Osamu Honmou, Toshihiko Yamashita, Tomonori Morita, Tsutomu Oshigiri, Ryosuke Hirota, Satoshi Iyama, Junji Kato, Yuichi Sasaki, Sumio Ishiai, Yoichi M Ito, Ai Namioka, Takahiro Namioka, Masahito Nakazaki, Yuko Kataoka-Sasaki, Rie Onodera, Shinichi Oka, Masanori Sasaki, Stephen G Waxman, Jeffery D Kocsis

  Clinical neurology and neurosurgery   203   106565 - 106565  2021年04月  [国際誌]

  　概要を見る

  BACKGROUND: Although spinal cord injury (SCI) is a major cause of disability, current therapeutic options remain limited. Recent progress in cellular therapy with mesenchymal stem cells (MSCs) has provided improved function in animal models of SCI. We investigated the safety and feasibility of intravenous infusion of MSCs for SCI patients and assessed functional status after MSC infusion. METHODS: In this phase 2 study of intravenous infusion of autologous MSCs cultured in auto-serum, a single infusion of MSCs under Good Manufacturing Practice (GMP) production was delivered in 13 SCI patients. In addition to assessing feasibility and safety, neurological function was assessed using the American Spinal Injury Association Impairment Scale (ASIA), International Standards for Neurological and Functional Classification of Spinal Cord (ISCSCI-92). Ability of daily living was assessed using Spinal Cord Independence Measure (SCIM-III). The study protocol was based on advice provided by the Pharmaceuticals and Medical Devices Agency in Japan. The trial was registered with the Japan Medical Association (JMA-IIA00154). RESULTS: No serious adverse events were associated with MSC injection. There was neurologic improvement based on ASIA grade in 12 of the 13 patients at six months post-MSC infusion. Five of six patients classified as ASIA A prior to MSC infusion improved to ASIA B (3/6) or ASIA C (2/6), two ASIA B patients improved to ASIA C (1/2) or ASIA D (1/2), five ASIA C patients improved and reached a functional status of ASIA D (5/5). Notably, improvement from ASIA C to ASIA D was observed one day following MSC infusion for all five patients. Assessment of both ISCSCI-92, SCIM-III also demonstrated functional improvements at six months after MSC infusion, compared to the scores prior to MSC infusion in all patients. CONCLUSION: While we emphasize that this study was unblinded, and does not exclude placebo effects or a contribution of endogenous recovery or observer bias, our observations provide evidence supporting the feasibility, safety and functional improvements of infused MSCs into patients with SCI.

  DOI PubMed

• Intravenous infusion of mesenchymal stem cells improves impaired cognitive function in a cerebral small vessel disease model.

  Nakazaki M, Sasaki M, Kataoka-Sasaki Y, Oka S, Suzuki J, Sasaki Y, Nagahama H, Hashi K, Kocsis JD, Honmou O

  Neuroscience   408   361 - 377  2019年04月  [査読有り]  [国際誌]

  担当区分：   筆頭著者

  　概要を見る

  Cerebral small vessel disease (CSVD) is not only a cause of vascular dementia (VD) but also a contributing factor to Alzheimer's disease (AD). The essential pathological feature of CSVD is the disruption of blood-brain barrier (BBB). Dysfunction of BBB due to degeneration of both endothelial cells and pericytes in capillaries leads to neuronal damage and progressive brain atrophy. Moreover, deterioration of amyloid-β (Aβ) clearance due to the failure of the transvascular BBB transport system results in accumulation of Aβ in the brain. Intravenous infusion of mesenchymal stem cells (MSCs) elicits functional recovery in experimental models including stroke and spinal cord injury. One effect of MSCs is to restore disrupted BBB through remodeling of microvasculature. Using spontaneously hypertensive rats (stroke-prone) with impaired cognitive function as a CSVD model, we have shown that infused MSCs has a therapeutic effect for cognitive function. Restoration of BBB function via remodeling of microvasculature and inhibition of Aβ accumulation could inhibit progressive brain atrophy and lead to restore cognitive dysfunction. Gene expression analysis indicated that infused MSCs activates both transforming growth factor-β and angiopoietin 1 signaling pathways and promotes the remodeling of microvasculature. Thus, infused MSCs may represent a novel therapy for both VD and AD.

  DOI PubMed

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• 脳梗塞に対する血栓回収療法後の骨髄間葉系幹細胞による細胞治療

  中崎公仁, 佐々木祐典, 佐々木祐典, 佐々木優子, 岡真一, 浪岡隆洋, 浪岡愛, KOCSIS Jeffery, 本望修, 本望修

  脳血管内治療(Web) ( (NPO)日本脳神経血管内治療学会 )  1 ( Supplement ) S221(J‐STAGE) - S221  2016年11月

  J-GLOBAL

• 患者まで届いている再生医療 脳梗塞後遺症の機能回復を目指した,骨髄間葉系幹細胞治療(医師主導治験Phase Ⅲ)

  中﨑 公仁, 岡 真一, 浪岡 愛

  再生医療 : 日本再生医療学会雑誌 ( メディカルレビュー社 )  13 ( 3 ) 304 - 308  2014年08月

  CiNii

• Preservation of interhemispheric cortical connections through corpus callosum following intravenous infusion of mesenchymal stem cells in a rat model of cerebral infarction.

  Nagahama H, Nakazaki M, Sasaki M, Kataoka-Sasaki Y, Namioka T, Namioka A, Oka S, Onodera R, Suzuki J, Sasaki Y, Kocsis JD, Honmou O

  Brain research   1695   37 - 44  2018年05月  [査読有り]   [ 国際誌 ]

  　概要を見る

  © 2018 Elsevier B.V. Systemic administration of mesenchymal stem cells (MSCs) following cerebral infarction exerts functional improvements. Previous research has suggested potential therapeutic mechanisms that promote neuroprotection and synaptogenesis. These include secretion of neurotrophic factors, remodeling of neural circuits, restoration of the blood brain barrier, reduction of inflammatory infiltration and demyelination, and elevation of trophic factors. In addition to these mechanisms, we hypothesized that restored interhemispheric bilateral motor cortex connectivity might be an additional mechanism of functional recovery. In the present study, we have shown, with both MRI diffusion tensor imaging (DTI) and neuroanatomical tracing techniques using an adeno-associated virus (AAV) expressing GFP, that there was anatomical restoration of cortical interhemispheric connections through the corpus callosum after intravenous infusion of MSCs in a rat middle cerebral artery occlusion (MCAO) stroke model. Moreover, the degree of connectivity was greater in the MSC-treated group than in the vehicle-infused group. In accordance, both the thickness of corpus callosum and synaptic puncta in the contralateral (non-infarcted) motor cortex connected to the corpus callosum were greater in the MSC-treated group than in the vehicle group. Together, these results suggest that distinct preservation of interhemispheric cortical connections through corpus callosum was promoted by intravenous infusion of MSCs. This anatomical preservation of the motor cortex in the contralateral hemisphere may contribute to functional improvements following MSC therapy for cerebral stroke.

  DOI PubMed

• 脳小血管病と緊急血栓回収療法の臨床転帰との関係

  中崎公仁, 野中雅, 野村達史, 恩田敏之, 野中雅, 野村達史, 恩田敏之, 米増保之, 高橋明, 橋本祐治, 本田修, 佐々木祐典, 大坊雅彦, 本望修

  脳循環代謝(Web) ( 日本脳循環代謝学会 )  29 ( 1 ) 159 - 159  2017年11月

  J-GLOBAL

• 脳小血管病と急性再開通治療3ヵ月後の臨床転帰との関係

  中崎 公仁, 野中 雅, 野村 達史, 恩田 敏之, 米増 保之, 高橋 明, 橋本 祐治, 本田 修, 佐々木 祐典, 大坊 雅彦, 本望 修

  脳血管内治療 ( (NPO)日本脳神経血管内治療学会 )  2 ( Suppl. ) S170 - S170  2017年11月

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産業財産権 【 表示 ／ 非表示 】

産業財産権 【 表示 ／ 非表示 】

• 脳梗塞の治療用医薬

  本望 修, 中崎 公仁, 佐々木 祐典, 佐々木 優子, 岡 真一

  特許権

  J-GLOBAL

• ステント内再狭窄の予防のための医薬組成物

  本望 修, 佐々木 祐典, 佐々木 優子, 前澤理恵, 岡 真一, 中崎 公仁

  特許権

• 筋萎縮性側索硬化症の治療用医薬組成物

  本望 修, 佐々木 祐典, 佐々木 優子, 前澤理恵, 岡 真一, 中崎 公仁

  特許権

• シナプス形成剤

  本望 修, 佐々木 祐典, 佐々木 優子, 前澤理恵, 岡 真一, 中崎 公仁

  特許権

• 寿命延長剤

  本望 修, 佐々木 祐典, 佐々木 優子, 前澤理恵, 岡 真一, 中崎 公仁

  特許権

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• 日本細胞外小胞学会学術集会奨励賞

  2024年10月  

• 上原財団海外留学助成 リサーチフェローシップ

  2018年03月  

• 日本脳卒中学会 最優秀口演賞

  2018年03月  

• ヨーロッパ脳卒中学会 Young Investigator Award

  2009年05月  

• 日本脳卒中学会 優秀ポスター賞

  2013年03月  

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• 脳血管性認知症に対する骨髄間葉系幹細胞移植による治療効果の検討

  基盤研究(C)

  研究期間:

  2015年04月

  -

  2018年03月

   

  中崎 公仁, 佐々木 祐典, 小野寺 理恵, 鰐渕 昌彦, 三上 毅, 浪岡 隆洋, 浪岡 愛, 本望 修

  　研究概要を見る

  近年、骨髄間葉系幹細胞(MSC)静注療法の臨床応用が進んでいる。本研究では、MSC静注療法が脳血管性認知症に対する治療効果を有するのかを検証した。Spontaneously hypertensive rats stroke-proneラット（SHRSP）を用いて、Vehicle群と比較検証した。認知機能が低下しているSHRSPに対して、21週にMSCを静脈投与した。介入後5週まで解析した結果、MSC群は、Vehicle群と比較して、有意に認知機能が高かった。また、MSC群において、大脳皮質と海馬の萎縮が抑制されていた。MSC静注療法は脳血管性認知症に対して、治療効果を有する可能性が高い。

• 骨髄間葉系幹細胞由来細胞外小胞による脊髄損傷治療の最適化

  研究期間:

  2024年09月

  -

  2025年03月

   

  担当区分： 研究代表者

• 脊髄損傷に対する骨髄間葉系幹細胞移植による、脳脊髄の可塑性亢進メカニズムの解析

  基盤研究(C)

  研究期間:

  2024年04月

  -

  2027年03月

   

  岡 真一, 鵜飼 亮, 横山 貴裕, 中崎 公仁

• 慢性期脳梗塞に対する骨髄幹細胞治療における至適リハビリ条件の探索

  基盤研究(C)

  研究期間:

  2024年04月

  -

  2027年03月

   

  山下 達郎, 佐々木 雄一, 佐々木 祐典, 鵜飼 亮, 岡 真一, 佐々木 優子, 本望 修, 中崎 公仁

• 脳梗塞に対する骨髄幹細胞治療による神経回路の再構築の革新的MRIによる統合的解析

  基盤研究(C)

  研究期間:

  2024年04月

  -

  2027年03月

   

  長濱 宏史, 佐々木 祐典, 本望 修, 中崎 公仁

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• rt-PA静注後の出血性脳梗塞に対する骨髄間葉系幹細胞の抑制効果の検証

   [招待有り]

  日本脳卒中学会総会 2016  

• 米国神経外傷学会 (Neurotrauma) Plenary session 招待講演

   [招待有り]

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• 米国科学研究名誉協会(Sigma Xi)正会員

  2024年04月

  -

  継続中