| Project/Area Number |
22K08386
|
| Research Category |
Grant-in-Aid for Scientific Research (C)
|
| Allocation Type | Multi-year Fund |
| Section | 一般 |
| Review Section |
Basic Section 53050:Dermatology-related
|
| Research Institution | University of the Ryukyus |
Principal Investigator |
|
| Co-Investigator(Kenkyū-buntansha) |
海川 正人 琉球大学, 医学(系)研究科(研究院), 准教授 (00325838)
|
| Project Period (FY) |
2022-04-01 – 2025-03-31
|
| Project Status |
Completed (Fiscal Year 2024)
|
| Budget Amount *help |
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2024: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2023: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2022: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
|
| Keywords | 皮膚有棘細胞癌 / 腫瘍関連マクロファージ / Rap2 / 有棘細胞癌 / 腫瘍微小環境 |
| Outline of Research at the Start |
腫瘍微小環境において、浸潤したマクロファージの一部は腫瘍関連マクロファージ(TAM)と呼ば れ、腫瘍の進行を促進する。有棘細胞癌検体のTAMでは癌遺伝子産物Rasの類縁体Rap2が発現しており、マウス骨髄単球をmacrophage colony-stimulating factor処理するとRap2発現が亢進した。本研究では、Rap2ノックアウト(KO)マウスを用いて、KOマウス由来マクロファージの遺伝子発現解析と細胞生物学的解析、KOマウスを用いた腫瘍形成実験を行う。TAMの腫瘍促進作用におけるRap2の機能解析を通して、Rap2が関与するシグナル経路を標的とした治療法の開発可能性を探る。
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| Outline of Final Research Achievements |
Rap2 (Rap2A, Rap2B and Rap2C) are Ras-like small G proteins. The function of Rap2 in cancer is not fully understood. We have found that Rap2 is expressed in tumor invasive monocytes (CD68 positive) at cutaneous SCC (cSCC) tissue specimens. There are two types of macrophages, inflammatory phenotype (M1) and regenerative phenotype (M2). Tumor associated macrophage (TAM) promote cancer metastasis by enhancing angiogenesis as well as tumor growth, migration and invasion. Rap2B expression in murine bone marrow-derived cells is up-regulated by macrophage colony stimulation factor (M-CSF). No difference in growth and morphology is found when bone marrow-derived cells from wild-type and Rap2B KO mice are stimulated by M-CSF. The expression of other isotypes (Rap2A and / or Rap2C) are not elevated. Expression of Ras and Rap1 do not change. Therefore, it is supposed that Rap2B is the specific molecule under M-CSF signaling. Rap2 function in TAM is under investigation using Rap2B KO mice.
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| Academic Significance and Societal Importance of the Research Achievements |
本研究課題で我々は、Rap2BがM-CSFシグナル経路に関与する特異的分子であることを明らかにした。また、先行実験ではマウス皮下接種腫瘍の増殖がRap2Bノックアウト(KO)マウスで促進することがわかった。Rap2の機能調節によるTAMの形質制御を通してcSCCの進展転移の抑制の可能性を明らかにした。
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