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Clarification of the mechanisms of cancer cell attachment and infiltration to suppress liver metastasis, and development of its prophylaxis.

Research Project

Project/Area Number 16K10562
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Digestive surgery
Research InstitutionUniversity of Tsukuba

Principal Investigator

kondo tadashi  筑波大学, 医学医療系, 教授 (00375495)

Co-Investigator(Kenkyū-buntansha) 田村 孝史  筑波大学, 医学医療系, 研究員 (20633192)
小川 光一  筑波大学, 医学医療系, 講師 (20733637)
Research Collaborator Matsumura Hideki  
Takahashi Kazuhiro  
Project Period (FY) 2016-04-01 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2018: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2017: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2016: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Keywords肝転移 / 血小板 / 癌細胞 / 膠着 / 炎症性サイトカイン / クッパー細胞 / 肝微小循環 / 大腸癌 / 微小循環 / 蛍光顕微鏡 / 肝類洞 / 肝臓外科学 / 生体蛍光顕微鏡 / 生体顕微鏡
Outline of Final Research Achievements

We clarified that platelets and cancer cells are located at the same place in the sinusoidal space. However, it was difficult to judge if this changes of the sinusoidal environment was secondary to platelet attachment to the sinusoid or the heat from the intravital microscope. In order to elucidate this mechanisms, we decided to use mass hepatectomized model, and assess the impact of platelets on parenchymal cell and non-parenchymal cells in the sinusoidal space. TNF-a and IL-6 levels in the liver, which are mainly released by liver sinusoidal epithelial cells and Kupffer cells, were found to increase under thrombocytotic condition after thrombopoetin administration, with activation of their downstream signals. Further, HGF level increased under thrombocytotic condition, which have anti-apoptotic effect on hepatocytes. Based on these results, we are planning to compare these effects after establishing liver metastasis model.

Academic Significance and Societal Importance of the Research Achievements

本研究の目的は、癌転移の起こるメカニズムを癌細胞と肝に存在する肝細胞や非実質細胞との接着や浸潤の観点から解明することである。肝血管内で癌細胞が血小板に膠着していることを確認したが、癌転移モデルの確立が難しく、その理由を明らかにできなかった。そこで、血小板の血管内の環境に対する影響を解明する必要があると考え、よく使用される大量肝切除モデルで検討した。トロンボポエチンにより血小板が増加すると、肝非実質から分泌される炎症性サイトカインの発現が増加し、下流シグナルも活性化した。また、坑アポトーシス効果を示すHGFの発現も増加した。肝転移モデルを確立後に、本結果と比較検討を行う予定である。

Report

(4 results)
  • 2018 Annual Research Report   Final Research Report ( PDF )
  • 2017 Research-status Report
  • 2016 Research-status Report

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Published: 2016-04-21   Modified: 2020-03-30  

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