• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

Dynamic analyses of interactions between leukemic stem cells and hemopoietic stromal cells visualized by molecular imaging technique, and their possible pharmaceutical applications.

Research Project

Project/Area Number 17209020
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section一般
Research Field Applied pharmacology
Research InstitutionWaseda University

Principal Investigator

ASANO Shigetaka  Waseda University, Faculty of Science and Engineering, Professor, 理工学術院, 教授 (50134614)

Co-Investigator(Kenkyū-buntansha) NOMURA Hitoshi  Waseda University, Faculty of Science and Engineering, Advancer Research Institute for Science and Engineering, Professor, 理工学術院(理工学総合研究センター), 教授 (40361670)
張 弘  先端科学健康医療融合研究機構, 講師 (20392384)
Project Period (FY) 2005 – 2006
Project Status Completed (Fiscal Year 2006)
Budget Amount *help
¥49,010,000 (Direct Cost: ¥37,700,000、Indirect Cost: ¥11,310,000)
Fiscal Year 2006: ¥17,680,000 (Direct Cost: ¥13,600,000、Indirect Cost: ¥4,080,000)
Fiscal Year 2005: ¥31,330,000 (Direct Cost: ¥24,100,000、Indirect Cost: ¥7,230,000)
Keywordscobblestone area / leukemic stem cells / stromal cells / self renewal / niche / repopulating assay / drug resistance / bioimaging / 細胞間相互作用 / 幹細胞 / 悪性腫瘍 / 分子イメージング / 蛍光標識
Research Abstract

A cobblestone area (CA) formation is generally regarded as one and only way to maintain normal pluripotent hemopoietic stem cells for long term in vitro, and therefore considered to mimic normal constitutive hematopoiesis in vivo. We have applied this culture system as a model of leukemia development involving maintenance and persistence of leukemic stem cells after various therapies, and optimized it by using MS5 as a supportive stroma, and HEL and TF-1 as model leukemic cell lines. Although the both leukemic cell lines derived from the same classification of erythroleukemia, they differ considerably each other, i.e., essentially every HEL cells seemed to maintain ability of CA formation, whereas only 10% of TF-1 population revealed CA formation, suggesting the presence of hierarchy along the differentiation in the latter cell line. Expression of some differentiation antigens such as Glycophorin-A and CD42b was diminished in the cells forming CA compared with original suspension cultu … More re of both cell lines, conversely, expression of CD44 which has recently been reported to be required for the homing of leukemic stem cells to bone marrow niche, was elevated in CA forming cells relative to the original suspension culture. Furthermore, the frequency of self renewal increased upon CA formation, which was evident from the result of repopulating assay, in contrast to the elevation of resting cell proportion demonstrated by flow cytometry. These results indicate that the CA forming cells may retain the properties of leukemic stem cells. Those CA forming cells were also characterized by greatly reduced sensitivity to various chemotherapeutic agents, in comparison to suspension cultures of the cognate cells. Particularly, Daunorubicin, a frequently prescribed anti-leukemic agent whose fluorescent property can be utilized to visualize its intracellular localization, showed distinct accumulation into the compartment corresponding to lysosome of the CA forming cells, and this was entirely different from the subcellular distribution observed in the drug-sensitive culture of the same cells. In summary, leukemic cells acquire drug resistance through the formation of CA, and one of the mechanisms behind this acquisition may involve alterations in intracellular transport and/or metabolism of the drugs, rather than mere physical prevention of the drug penetration into hemopoietic niche where leukemic stem cells reside. The currently described system of heterologous CA formation using murine MS5 stromal cells was considered to be useful particularly as an evaluating system for desirable drugs in the forthcoming era of personalized medicine. Less

Report

(3 results)
  • 2006 Annual Research Report   Final Research Report Summary
  • 2005 Annual Research Report

URL: 

Published: 2005-04-01   Modified: 2016-04-21  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi