海川　正人 (ウミカワ　マサト)

Umikawa Masato

写真a

職名

准教授

科研費研究者番号

00325838
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  • 専任   琉球大学   医学研究科   准教授  

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  • 大阪大学 -  医学博士  その他 / その他

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  • 2002年07月
    -
    継続中

      琉球大学　医学研究科　医科学専攻　准教授  

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  • 生化学,実験遺伝学

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  • ライフサイエンス / 分子生物学

  • ライフサイエンス / 細胞生物学

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  • miR-935 Inhibits Oral Squamous Cell Carcinoma and Targets Inositol Polyphosphate-4-phosphatase Type IA (INPP4A).

    Maruyama N, Umikawa M, Matsumoto H, Maruyama T, Nishihara K, Nakasone T, Matayoshi A, Goto T, Hirano F, Arasaki A, Nakamura H, Matsuzaki G, Takaesu G

    Anticancer research ( Anticancer Research )  40 ( 11 ) 6101 - 6113   2020年11月 [ 査読有り ]

    掲載種別: 研究論文（学術雑誌）

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  • Quadruple Multiple Primary Malignancies: Early Detection of Second Primary Malignancy by Esophagogastroduodenoscopy/Colonoscopy Is Crucial for Patients with Classic Kaposi's Sarcoma.

    Maruyama N, Okubo Y, Umikawa M, Matsuzaki A, Hokama A, Hirano F, Maruyama T, Nishihara K, Nakasone T, Makishi S, Nakamura H, Yoshimi N

    Diagnostics (Basel, Switzerland) ( Diagnostics )  10 ( 4 )   2020年04月 [ 査読有り ]

    掲載種別: 研究論文（学術雑誌）

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  • MicroRNA-196a-5p is a potential prognostic marker of delayed lymph node metastasis in early-stage tongue squamous cell carcinoma.

    Maruyama T, Nishihara K, Umikawa M, Arasaki A, Nakasone T, Nimura F, Matayoshi A, Takei K, Nakachi S, Kariya KI, Yoshimi N

    Oncology letters ( Spandidos Publications )  15 ( 2 ) 2349 - 2363   2018年02月 [ 査読有り ]

    掲載種別: 研究論文（学術雑誌）

    　概要を見る

    MicroRNAs (miRs) are expected to serve as prognostic tools for cancer. However, many miRs have been reported as prognostic markers of recurrence or metastasis in oral squamous cell carcinoma patients. We aimed to determine the prognostic markers in early-stage tongue squamous cell carcinoma (TSCC). Based on previous studies, we hypothesized that miR-10a, 10b, 196a-5p, 196a-3p, and 196b were prognostic markers and we retrospectively performed miR expression analyses using formalin‑fixed paraffin‑embedded sections of surgical specimens. Total RNA was isolated from cancer tissues and adjacent normal tissue as control, and samples were collected by laser-capture microdissection. After cDNA synthesis, reverse transcription-quantitative polymerase chain reaction was performed. Statistical analyses for patient clinicopathological characteristics, recurrence/metastasis, and survival rates were performed to discern their relationships with miR expression levels, and the 2-ΔΔCq method was used. miR-196a-5p levels were significantly upregulated in early-stage TSCC, particularly in the lymph node metastasis (LNM) group. The LNM-free survival rate in the low miR-196a-5p ΔΔCq value regulation group was found to be lower than that in the high ΔΔCq value regulation group (P=0.0079). Receiver operating characteristic analysis of ΔΔCq values revealed that miR-196a-5p had a P-value=0.0025, area under the curve=0.740, and a cut-off value=-0.875 for distinguishing LNM. To our knowledge, this is the first study to examine LNM-related miRs in early-stage TSCC as well as miRs and ‘delayed LNM’ in head and neck cancer. miR-196a-5p upregulation may predict delayed LNM. Our data serve as a foundation for future studies to evaluate miR levels and facilitate the prediction of delayed LNM during early-stage TSCC, which prevent metastasis when combined with close follow-up and aggressive adjuvant therapy or elective neck dissection. Moreover, our data will serve as a foundation for future studies to evaluate whether miR-196a-5p can serve as a therapeutic marker for preventing metastasis.

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  • Angiopoietin-like protein 2 induces proinflammatory responses in peritoneal cells.

    Umikawa M, Umikawa A, Asato T, Takei K, Matsuzaki G, Kariya K, Zhang CC

    Biochemical and biophysical research communications ( ACADEMIC PRESS INC ELSEVIER SCIENCE )  467 ( 2 ) 235 - 41   2015年11月 [ 査読有り ]

    掲載種別: 研究論文（学術雑誌）

    　概要を見る

    Monocytes and macrophages are important effectors and regulators of inflammation, and both their differentiation and activation are regulated strictly in response to environmental cues. Angiopoietin-like protein 2 (Angpt12) is a multifaceted protein, displaying many physiological and pathological functions in inflammation, angiogenesis, hematopoiesis, and tumor development. Although recent studies implicate Angpt12 in chronic inflammation, the mechanisms of inflammation caused by Angpt12 remain unclear. The purpose of the present study was to elucidate the role of Angpt12 in inflammation by understanding the effects of Angpt12 on monocytes/macrophages. We showed that Angptl2 directly activates resident murine peritoneal monocytes and macrophages and induces a drastic upregulation of the transcription of several inflammatory genes including nitric oxide synthase 2 and prostaglandin-endoperoxide synthase 2, and several proinflammatory cytokine genes such as interleukin (IL)-1 beta, IL-6, TNF alpha, and CSF2, along with activation of ERK, JNK, p38, and nuclear factor kappa B signaling pathways. Concordantly, proinflammatory cytokines IL-1 beta, IL-6, TNF alpha, and GM-CSF, were rapidly elevated from murine peritoneal monocytes and macrophages. These results demonstrate a novel role for Angpt12 in inflammation via the direct activation of peritoneal monocytes and macrophages. (C) 2015 Elsevier Inc. All rights reserved.

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  • Mitogen-activated protein kinase kinase kinase kinase 4 as a putative effector of Rap2.

    Machida. N. et al.

    J. Biol. Chem. ( その他の出版社 )  279   15711 - 15714   2004年03月

    掲載種別: 研究論文（その他学術会議資料等）

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