崎浜 秀悟 (サキハマ シュウゴ)

Sakihama Shugo

写真a

職名

助教

科研費研究者番号

30835129

現在の所属組織 【 表示 / 非表示

  • 専任   琉球大学   保健学研究科   保健学専攻   助教  

出身大学 【 表示 / 非表示

  •  
    -
    2013年03月

    琉球大学   医学部   保健学科検査技術学コース   卒業

出身大学院 【 表示 / 非表示

  • 2013年04月
    -
    2015年03月

    琉球大学  保健学研究科  博士前期課程  修了

  • 2015年04月
    -
    2018年03月

    琉球大学  保健学研究科  博士後期課程  修了

取得学位 【 表示 / 非表示

  • 琉球大学 -  博士 (保健学)  血液免疫検査学

職歴 【 表示 / 非表示

  • 2018年04月
    -
    2022年05月

      琉球大学大学院 医学研究科 細胞病理学講座  

  • 2022年06月
    -
    継続中

      琉球大学医学部保健学科 血液免疫検査学分野  

研究キーワード 【 表示 / 非表示

  • 成人T細胞白血病/リンパ腫

研究分野 【 表示 / 非表示

  • ライフサイエンス / 血液、腫瘍内科学

論文 【 表示 / 非表示

  • Coactivation of innate immune suppressive cells induces acquired resistance against combined TLR agonism and PD-1 blockade

    Nishinakamura, H; Shinya, S; Irie, T; Sakihama, S; Naito, T; Watanabe, K; Sugiyama, D; Tamiya, M; Yoshida, T; Hase, T; Yoshida, T; Karube, K; Koyama, S; Nishikawa, H

    SCIENCE TRANSLATIONAL MEDICINE ( Science Translational Medicine )  17 ( 785 ) eadk3160   2025年02月 [ 査読有り ]

    掲載種別: 研究論文(学術雑誌)

     概要を見る

    Immune checkpoint blockade therapy has been successfully applied in clinical settings as a standard therapy for many cancer types, but its clinical efficacy is restricted to patients with immunologically hot tumors. Various strategies to modify the tumor microenvironment (TME), such as Toll-like receptor (TLR) agonists that can stimulate innate immunity, have been explored but have not been successful. Here, we show a mechanism of acquired resistance to combination treatment consisting of an agonist for multiple TLRs, OK-432 (Picibanil), and programmed cell death protein 1 (PD-1) blockade. Adding the TLR agonist failed to convert the TME from immunogenically cold to hot and did not augment antitumor immunity, particularly CD8+ T cell responses, in multiple animal models. The failure was attributed to the coactivation of innate suppressive cells, such as polymorphonuclear myeloid-derived suppressor cells (PMN-MDSCs) expressing CXCR2, through high CXCL1 production by macrophages in the TME upon OK-432 treatment. A triple combination treatment with OK-432, PD-1 blockade, and a CXCR2 neutralizing antibody overcame the resistance induced by PMN-MDSCs, resulting in a stronger antitumor effect than that of any dual combinations or single treatments. The accumulation of PMN-MDSCs was similarly observed in the pleural effusions of patients with lung cancer after OK-432 administration. We propose that successful combination cancer immunotherapy intended to stimulate innate antitumor immunity requires modulation of unwanted activation of innate immune suppressive cells, including PMN-MDSCs.

  • Recent progress in pathological understanding of adult T-cell leukemia/ lymphoma in the new classification era

    Karube, K; Sakihama, S; Takatori, M; Morichika, K; Tamaki, T; Wada, N; Fukushima, T

    LEUKEMIA RESEARCH ( Leukemia Research )  148   107634 - 107634   2025年01月 [ 査読有り ]

    掲載種別: 研究論文(学術雑誌)

     概要を見る

    Adult T-cell leukemia/lymphoma (ATLL) is a peripheral T-cell lymphoma caused by Human T-cell leukemia virus type 1 (HTLV-1) infection. Although the 5th Edition of the WHO classification (WHO-5) did not make drastic changes regarding the disease concept of ATLL from the revised 4th Edition of the WHO classification (WHO-4R), WHO-5 newly introduced the essential and desirable diagnostic criteria, namely, "neoplastic lymphoid cell proliferation with mature T-cell phenotype; proven HTLV-1 carriership" and "identification of monoclonal integration of HTLV-1", respectively. To satisfy the desirable criteria, a new diagnostic method using a combination of HBZ-ISH and tax-PCR was introduced for the identification of the HTLV-1 in addition to the conventionally used Southern blot hybridization, especially in the case when only FFPE specimens are available. Morphologically, pleomorphic- and anaplastic large cell-type, account for most cases, while minor variants, ATLL with dermatopathic reaction, angioimmunoblastic T-cell lymphoma-like variant, and classic Hodgkin lymphoma-like variant, should also be noted as diagnostic pitfalls. Phenotypically, about 80 % of ATLL cases show a typical phenotype of CD3 + CD4 +CD25 +CCR4 + , while about 10 % show atypical phenotypes such as T follicular helper cell-like one. Many genetic abnormalities, mainly associated with the TCR signaling pathway, are observed, and most are more frequent in the aggressive type than in the indolent type, except for STAT3, indicating the heterogeneous pathogenic process of ATLL. In this review, we present the latest findings on molecular pathogenesis and histopathological findings of ATLL in the era of the new classification of lymphomas, serving as a basis for future research and classification.

  • A Comprehensive Study of the Immunophenotype and its Clinicopathologic Significance in Adult T-Cell Leukemia/Lymphoma.

    Tamaki T, Karube K, Sakihama S, Tsuruta Y, Awazawa R, Hayashi M, Nakada N, Matsumoto H, Yagi N, Ohshiro K, Nakazato I, Kitamura S, Nishi Y, Miyagi T, Yamaguchi S, Nakachi S, Morishima S, Masuzaki H, Takahashi K, Fukushima T, Wada N

    Modern pathology : an official journal of the United States and Canadian Academy of Pathology, Inc   36 ( 8 ) 100169 - 100169   2023年03月 [ 査読有り ]

    掲載種別: 研究論文(学術雑誌)

     概要を見る

    Adult T-cell leukemia/lymphoma (ATLL) is a mature T-cell tumor caused by human T-lymphotropic virus type 1 (HTLV-1). The typical ATLL immunophenotypes are described in the 2017 World Health Organization Classification of Tumours of Haematopoietic and Lymphoid Tissues (positive: CD2, CD3, CD5, CD4, and CD25; negative: CD7, CD8, and cytotoxic markers; and partially positive: CD30, CCR4, and FOXP3). However, limited studies are available on the expression of these markers, and their mutual relationship remains unknown. Furthermore, the expression status of novel markers associated with T-cell lymphomas, including Th1 markers (T-bet and CXCR3), Th2 markers (GATA3 and CCR4), T follicular helper markers (BCL6, PD1, and ICOS), and T-cell receptor (TCR) markers, and their clinicopathologic significance is unclear. In this study, we performed >20 immunohistochemical stains in 117 ATLL cases to determine the comprehensive immunophenotypic profile of ATLL, which were compared on the basis of clinicopathologic factors, including morphologic variants (pleomorphic vs anaplastic), biopsy locations, treatments, Shimoyama classification-based clinical subtype, and overall survival. CD3+/CD4+/CD25+/CCR4+ was considered a typical immunophenotype of ATLL, but approximately 20% of cases did not conform to this pattern. Simultaneously, the following new findings were obtained: (1) most cases were negative for TCR-β and TCR-δ (104 cases, 88.9%), indicating the usefulness of negative conversion of TCR expression to provide differentiation from other T-cell tumors; (2) the positivity of CD30 and CD15 and the negativity of FOXP3 and CD3 were significantly associated with anaplastic morphology; and (3) atypical cases, such as T follicular helper marker-positive (12 cases, 10.3%) and cytotoxic molecule-positive cases (3 cases, 2.6%), were identified. No single markers could predict the overall survival among patients with acute/lymphoma subtypes of ATLL. The results of this study illustrate the diversity of ATLL phenotypes. In T-cell tumors occurring in HTLV-1 carriers, the possibility of ATLL should not be eliminated even when the tumor exhibits an atypical phenotype, and the confirmation of HTLV-1 in the tissue is recommended.

  • Spindle cell tumor with histiocytic and myogenic marker expression in the lymph node of a human T-cell leukemia virus type 1 carrier.

    Kubo T, Hirayama Y, Sakihama S, Kikuchi T, Hirohashi Y, Tsujiwaki M, Karube K, Hasegawa T, Torigoe T

    Pathology, research and practice ( Pathology Research and Practice )  234   153935   2022年06月 [ 査読有り ]

    掲載種別: 研究論文(学術雑誌)

  • Genetic Alterations in Adult T-Cell Leukemia/Lymphoma: Novel Discoveries with Clinical and Biological Significance.

    Sakihama S, Karube K

    Cancers ( Cancers )  14 ( 10 )   2022年05月 [ 査読有り ]

    掲載種別: 研究論文(学術雑誌)

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学術関係受賞 【 表示 / 非表示

  • 第61回日本リンパ網内系学会総会優秀演題賞

    2021年06月   日本リンパ網内系学会   沖縄県における成人T細胞白血病・リンパ腫における遺伝子異常: HTLV-1-tax遺伝子型に注目した解析  

    受賞者: ■■■

  • 平成30年度 若手研究者奨励賞

    2018年09月   日本HTLV-1学会  

    受賞者: 崎浜 秀悟, 森近 一穂, 齋藤 るみ子, 坂井 和子, 西尾 和人, 益崎 裕章, 福島 卓也, 加留部 謙之輔

科研費獲得情報 【 表示 / 非表示

  • ATLLにおけるPRKCB・CARD11変異共存の臨床的/機能的意義

    若手研究

    課題番号: 2 3 K 1 5 3 0 4

    研究期間: 2023年04月  -  継続中 

  • ATLLにおけるPRKCB・CARD11変異共存の臨床的/機能的意義

    若手研究

    課題番号: 23K15304

    研究期間: 2023年04月  -  2025年03月 

    代表者: 崎浜 秀悟 

    直接経費: 3,500,000(円)  間接経費: 4,550,000(円)  金額合計: 1,050,000(円)

     概要を見る

    ATLは、HTLV-1キャリアの一部が発症する末梢性T細胞悪性腫瘍である。ATL細胞における遺伝子変異はT cell receptor/nuclear factor-κB (NF-κB) 経路関連分子に集積している。特に、PRKCBおよびCARD11の変異は高頻度に検出され、同一症例に併発することが多く、腫瘍細胞の発生・進展に寄与していることが強く疑われる。そこで本研究では、PRKCBおよびCARD11における変異がタンパク質機能および臨床病態に及ぼす影響を解析している。 先行研究におけるコホートを用いた予備解析では、PRKCB変異はCARD11 Coiled-coilドメインの変異と有意に共存していたが、抑制性ドメインの変異とは関連が見られなかった。そこで、再現性を確認するために新たにaggressive ATLの症例を蓄積し、ターゲットシーケンスおよびlong-PCRによる両遺伝子の変異について解析中である。現在のところ50例のサンプルに対する遺伝子変異の検出が完了している。 両遺伝子における変異がタンパク質機能に及ぼす影響を解析するために、ATLにおいて高頻度に報告されているPKCβ変異体1種 (p.D427N) 、およびCARD11変異体4種 (p.D230N, p.D401N, p.S585_R467del, p.F902C) の発現ベクターを作製し、細胞株を用いた検討を進めている。予備実験で実施したHEK293T細胞株を用いたルシフェラーゼアッセイで、相加的にNF-κBを活性化させた両変異の組み合わせについて、ATL細胞株を含むリンパ球系の細胞株で再現性を確認中である。また、両遺伝子の変異の組み合わせにより、CARD11に動員されるタンパク質に違いがあるか検討中である。

  • 沖縄県における成人T細胞白血病/リンパ腫のゲノム解析

    若手研究

    課題番号: 19K17835

    研究期間: 2019年04月  -  2021年03月 

    代表者: 崎浜 秀悟 

    直接経費: 3,300,000(円)  間接経費: 990,000(円)  金額合計: 4,290,000(円)