岩本 卓士 ( イワモト タクジ )

Iwamoto, Takuji

写真a

所属(所属キャンパス)

医学部 整形外科学教室 ( 信濃町 )

職名

准教授

HP

外部リンク

免許・資格 【 表示 / 非表示

  • 医師免許証, 2000年04月

 

研究分野 【 表示 / 非表示

  • ライフサイエンス / 整形外科学

 

論文 【 表示 / 非表示

  • Enhanced nerve regeneration after transplantation of NCAM-positive neural crest-like cells derived from human iPSC

    Amemiya T., Ouchi T., Kimura H., Okuyama K., Phan T.Q., Iwamoto T., Nakagawa T., Matsumoto M., Nakamura M., Okano H., Nagoshi N., Shibata S.

    Inflammation and Regeneration 46 ( 1 )  2026年12月

    ISSN  18809693

     概要を見る

    Background: Peripheral nerve injuries often cause persistent sensory and motor deficits, and autologous nerve grafting, the current standard, is limited by donor site morbidity and tissue availability. Human induced pluripotent stem cells (hiPSCs)-derived neural crest-like cells (NCLCs) have shown potential for nerve regeneration, but achieving high purity and safety remains a challenge. Methods: Using a mouse model of large sciatic nerve defects, we evaluated the efficacy of transplanting NCLCs triple-positive for low-affinity nerve growth factor receptor (LNGFR), thymocyte antigen 1 (THY-1), and neural cell adhesion molecule (NCAM). Purified triple-positive cells induced from hiPSC-derived neural crest lineage were seeded in the conduit with collagen gel in the transplantation group and compared the regeneration with the autograft group and the negative control group without cells. Results: NCAM-positive NCLCs promoted robust angiogenesis and recruited host Schwann cells, thereby establishing a supportive regenerative microenvironment. This facilitated axonal regrowth, thick myelination, and organized nerve architecture comparable to that of autografts. Functional recovery, assessed by electrophysiological conduction and motor performance, eventually matched autografts, with earlier improvement observed in the transplantation group. No tumor formation was detected, and the proliferative activity of transplanted cells declined over time. Selective marker-based purification likely contributed to the favorable safety profile. Conclusion: NCAM-positive NCLCs derived from hiPSCs enhance peripheral nerve regeneration through vascularization and Schwann cell-mediated remyelination, resulting in structural and functional recovery equivalent to autografts. This strategy offers a safe, scalable alternative to donor nerve harvest, and integration with bioengineered conduits could further expand clinical applicability in peripheral nerve reconstruction.

  • Quantitative assessment of ulnohumeral instability after K-NOW unlinked total elbow arthroplasty using the helical axis: a pilot study.

    Sugiura Y, Iwamoto T, Matsumoto Y, Kiyota Y, Suzuki T, Nagura T, Ogihara N, Nakamura M

    Journal of shoulder and elbow surgery 2026年07月

    ISSN  1058-2746

  • 【全身の関節の解剖、39の病態、ケアの流れがこの1冊に! 整形外科の「関節」超深掘り!】(第3章)手関節 手関節で起こりやすい疾患と看護 関節リウマチ

    岩本 卓士

    整形外科看護 ((株)メディカ出版)   ( 2026夏季増刊 ) 107 - 111 2026年06月

    ISSN  1342-4718

  • Anatomical Reconstruction of the Terminal Tendon and Lateral Band for Severe Chronic Tendon Mallet Injury

    Suzuki T., Kiyota Y., Matsumura N., Sato K., Nakamura M., Iwamoto T.

    Journal of Hand Surgery 51 ( 1 ) 92 - 92.e7 2026年01月

    ISSN  03635023

     概要を見る

    Purpose This study aimed to evaluate the clinical outcomes of surgical treatment for chronic mallet injury with severe extension lag using an anatomic reconstruction of the terminal tendon and lateral band with a palmaris longus (PL) tendon graft. Methods Eleven patients with a mean age of 52 years (range, 24–82 years) who underwent surgical reconstruction for chronic tendon mallet injuries using the PL tendon were included. The harvested PL tendon was either folded longitudinally or divided into two slips. The graft was secured to the distal phalanx using a bone anchor and sutured to the soft tissues and remnants of the original terminal tendon distal to the distal interphalangeal (DIP) joint. Each half-slip tendon was passed under the transverse retinacular ligament and sutured side-to-side to the lateral band at approximately the midpoint of the proximal phalanx. The active range of motion of the affected finger was evaluated before and after surgery, and any complications were recorded. Results Before surgery, the extension of the DIP joint averaged −49.5° (range, −40° to −60°). The postoperative mean lag of the DIP joint improved to −7.8° (range, −20° to +20°). According to the Miller classification, four patients had excellent results, four had good results, and three had fair results. Two patients who underwent folded-PL tendon grafting developed superficial dorsal skin infections on the little finger that resolved with oral antibiotics or removal of the sutures. Conclusions Anatomical reconstruction of the terminal tendon and lateral bands using a PL tendon graft yielded satisfactory outcomes in chronic tendon mallet injuries. Dividing the PL tendon into two slips is recommended to reduce the risk of postoperative infection. Type of study/level of evidence Therapeutic IV.

  • Platelet-like cells differentiated from adipose-derived mesenchymal stem cells inhibit acute inflammation of tendinopathy in rats

    Torii A., Yamada Y., Ono-Uruga Y., Sato Y., Kaneko Y., Nakamura S., Iwamoto T., Matsubara Y., Matsumoto M., Nakamura M., Sato K., Miyamoto T.

    Journal of Bone and Mineral Metabolism 44 ( 1 ) 18 - 27 2026年01月

    ISSN  09148779

     概要を見る

    Introduction: Tendinopathy, a disease that causes inflammation and pain and limits patients’ activities of daily living, is considered particularly important to treat during the acute inflammatory phase to prevent the transition to chronic degeneration. Recently, platelet-rich plasma (PRP) has been used to treat tendinopathy; however, it is not clear whether platelets themselves, which are the active component of PRP, could be effective in treating tendinopathy. Materials and Methods: We made rat Achilles tendinopathy models by incision of the calcaneal attachment and administrated platelet-like cells derived from adipose-derived mesenchymal stem cells (ASCL-PLCs) to the injury site and investigated the anti-inflammatory effect. Results: ASCL-PLCs significantly inhibits the inflammatory cytokine expression and inflammatory cell infiltration in acute tendonitis in a rat Achilles tendon injury model in vivo. Interestingly, we observed no xeno-reaction when human-derived ASCL-PLCs were administered to wild-type rats in vivo. Moreover, IL-6 expression and phosphorylation seen in NIH3T3 fibroblasts treated with IL-6 plus soluble IL-6 receptor were both significantly suppressed by ASCL-PLCs in vitro. Conclusion: ASCL-PLC has advantages over existing PRP therapies, including the ability to be cryopreserved after quality checks, and homogeneous populations of ASCL-PLCs can be prepared in large quantity. We conclude that in the future ASCL-PLCs may serve as an allogeneic transplant effective to treat tendinopathy.

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総説・解説等 【 表示 / 非表示

  • RSA機種選択の変遷 私の場合

    松村 昇, 赤尾 翔太郎, 川崎 みづ紀, 田邉 優, 清田 康弘, 大木 聡, 鈴木 拓, 松本 守雄, 中村 雅也, 岩本 卓士

    日本整形外科学会雑誌 ((公社)日本整形外科学会)  100 ( 2 ) S447 - S447 2026年03月

    ISSN  0021-5325

  • 空間トランスクリプトーム解析を用いた治療抵抗性関節リウマチの病態解明

    石原 啓成, 浅野 達雄, 岩本 卓士, 中村 雅也, 高柳 広

    日本リウマチ学会総会・学術集会プログラム・抄録集 ((一社)日本リウマチ学会)  70回   726 - 726 2026年03月

  • 疾患活動性をコントロール可能な時代のリウマチ手術タイミング 関節リウマチによる肘関節障害に対する手術適応と治療選択

    岩本 卓士, 清田 康弘, 大木 聡, 鈴木 拓, 松村 昇, 佐藤 和毅, 松本 守雄, 中村 雅也

    日本整形外科学会雑誌 ((公社)日本整形外科学会)  100 ( 3 ) S657 - S657 2026年03月

    ISSN  0021-5325

  • 母指CM関節症に対するsuture-button suspensionplasty 鏡視下と直視下大菱形骨部分切除の比較検討

    清田 康弘, 大木 聡, 鈴木 拓, 中山 政憲, 松村 昇, 佐藤 和毅, 松本 守雄, 中村 雅也, 岩本 卓士

    日本整形外科学会雑誌 ((公社)日本整形外科学会)  100 ( 3 ) S1195 - S1195 2026年03月

    ISSN  0021-5325

  • リウマチ手肘の最新治療戦略 患者ニーズに基づく個別化アプローチ

    岩本 卓士

    日本リウマチ学会総会・学術集会プログラム・抄録集 ((一社)日本リウマチ学会)  70回   997 - 997 2026年03月

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競争的研究費の研究課題 【 表示 / 非表示

  • ヒトiPS細胞由来神経突起束を用いた人工神経の規格化に向けた研究

    2024年04月
    -
    2027年03月

    岩本 卓士, 基盤研究(C), 補助金,  研究代表者

  • 外傷性異所性骨化の病態解明と新規治療法の探索

    2021年04月
    -
    2024年03月

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

  • 手指変形性関節症に対するCT画像に基づく3Dプリンティング治療装具の開発

    2018年04月
    -
    2021年03月

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

  • 人工肘関節置換術におけるコンピューター支援手術システムの確立

    2015年04月
    -
    2018年03月

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

 

担当授業科目 【 表示 / 非表示

  • 整形外科学講義

    2026年度

  • 整形外科学臨床実習

    2026年度

  • 急性期病態学各論

    2026年度

  • 急性期病態学各論

    2025年度

  • 整形外科学講義

    2025年度

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所属学協会 【 表示 / 非表示

  • 日本整形外科学会

     
  • 日本リウマチ学会

     
  • 日本手外科学会

     
  • 日本肘関節学会

     
  • 日本人工関節学会