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第430回TSMMセミナー

2016/10/18

*This seminar is regarded as a lecture for the subject “Seminar in Medical Sciences”.
*This seminar will be given in English.

Title: Generation of human T cell acute lymphoblastic leukemia by de novo transformation of human cord blood progenitors with a 4-oncogene cocktail.

Speaker:Dr. Manabu Kusakabe
Postdoctoral fellow at Terry Fox Laboratory, British Columbia Cancer Agency, Vancouver, Canada
Data:October 18, 2016 17:00-18:30
Venue:Seminar Room 483 (Igakukei-tou 4th floor)

Abstract: 
 T-cell acute lymphoblastic leukemia (T-ALL) is an aggressive form of blood cancer that affects both children and adults. Numerous studies have explored the effects of putative T-ALL oncogenes in mouse models and have contributed to our understanding of disease pathogenesis.
Nonetheless, it is clear there are important differences between mouse and human cells, particularly with respect to cellular transformation.
In this study, we sought to create human T-ALL in the lab from normal cord blood (CB) progenitors by lentiviral transduction with a combination of known T-ALL oncogenes. Transduced cells were cultured on OP9-DL1 stromal feeders to study their behaviour in vitro. Also, we performed transplantation into NOD/SCID-IL2Rg-null (NSG) mice to assess leukemogenesis in vivo. Non-transduced cells stopped expanding within the first few weeks, however T-ALL oncogenes transduced cells continue to expand for over 60 days in vitro. The recipients of T-ALL oncogene transduced cell developed clinically morbid disease and showed splenomegaly, lymphadenopathy, and enlarged thymus. Transduced cells were infiltrated into these organs and expressed CD2, CD3, CD7 and CD38
supporting acute T-cell leukemia. Importantly, these cells were serially transplantable into NSG mice. Our in vitro and in vivo results suggest that the 4 T-ALL oncogenes are sufficient to transform normal human blood cells into clonal T-ALL-like malignant cells. This model provides a significant step forward to reveal the mechanisms involved in human T-ALL pathogenesis.

*TSMMセミナーは,フロンティア医科学専攻(修士)「医科学セミナーII」(担当:久武幸司),
生命システム医学専攻 & 疾患制御医学専攻(博士)「最先端医学研究セミナー」(担当:熊谷嘉人,島野仁)及び「医学セミナー」(担当:専攻各教員)の関連セミナーに相当します。

【筑波分子医学協会(TSMM)】HP
http://www.md.tsukuba.ac.jp/public/tsmm/
TSMMセミナー担当  筑波大学医学医療系 塩見健輔
Mail : kshiomi@md.tsukuba.ac.jp(#@#を 「@」 に置き換えてください)

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