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Mouse acute leukemia develops independent of self-renewal and differentiation potentials in hematopoietic stem and progenitor cells

Fang Dong, Haitao Bai, Xiaofang Wang, Shanshan Zhang, Zhao Wang, Miner Xie, Sen Zhang, Jinhong Wang, Sha Hao, Tao Cheng and Hideo Ema

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Article Figures & Data

Figures

  • Figure 1.

    Reconstitution potentials of HSC1, HSC2, HPC1, HPC2, and HPC3. (A) Flow cytometry sorting strategy for HSC and HPC populations. Lin cells were separated into CD34 and CD34+ fractions and then gated on c-Kit+Sca-1+ cells, respectively. According to the expression levels of CD150 and CD41, CD34LSK cells were separated into HSC1, HSC2, and HPC1, and CD34+ LSK cells were separated into HPC2 and HPC3. (B) The percentage of donor cells in PB. Ten HSC1, 10 HSC2, 10 HPC1, 50 HPC2, and 250 HPC3 cells were mixed with 5 × 105 BM cells and injected into lethally irradiated recipient mice. The PB of recipient mice was analyzed at 1, 4, 6, and 12 months after transplantation (n = 6 for each population; however, some mice died after transplantation).

  • Figure 2.

    Transplantation with MA9-transduced HSCs and HPCs. (A) Percentages of GFP+ cells in the PB of mice after transplantation (n = 9-15). (B) Survival curves of mice transplanted with each cell population. Leukemic mice from 3 independent experiments were summarized (n = 7-14 per group). The log-rank test was used to compare the percentages of survival.

  • Figure 3.

    New LSC detection in MA9 mice. HSC markers were used to detect leukemic HSC/HPC cells in the BM of MA9 mice. GFP+ cells were first gated. LinIL7-RCD34+/−c-Kit+Sca-1+CD150CD41Mac-1+ (L-CD34−/+LSK) cells were detected in all MA9 leukemic mice derived from 5 different populations (HSC1 [A], HSC2 [B], HPC1 [C], HPC2 [D], and HPC3 [E]). SSC, side scatter.

  • Figure 4.

    Switchover between L-CD34/+LSK and L-GMP cells. L-CD34LSK, L-CD34+LSK, and L-GMP cells were isolated from primary AML mice (HSC1:MA9) and transplanted into sublethally irradiated recipient mice individually. When the recipient mice developed leukemia (secondary leukemia), BM cells were analyzed. L-CD34LSK (A), L-CD34+LSK (B), and L-GMP (C) cells gave rise to all L-CD34LSK, L-CD34+LSK, and L-GMP cells.

  • Figure 5.

    Transplantation with ICN-1–transduced HSCs and HPCs. (A) Percentages of GFP+ cells in the PB of mice after transplantation (n = 11-16). (B) Survival curves of mice transplanted with each cell population. Leukemic mice from 3 independent experiments were summarized (n = 4-15 per group). The log-rank test was used to compare the percentages of survival (***P < .001).

  • Figure 6.

    New LSC detection in ICN-1 mice. HSC markers were used to detect leukemic HSC/HPC cells in the BM of ICN-1 mice. GFP+LinIL7-RCD34+/−c-Kit+ Sca-1+ (L-LSK) cells were detected in all ICN-1 leukemic mice derived from 5 different populations (HSC1 [A], HSC2 [B], HPC1 [C], HPC2 [D], and HPC3 [E]).

  • Figure 7.

    The cell of origin and LSC-switching model. (A) Multiple cells, such as HSC1, HSC2, HPC1, HPC2, and HPC3 cells, serve as the cell of origin. After leukemia is initiated, the leukemia pool is expanded and maintained through back-and-forth switching among (B) heterogeneous LSCs (for instance, LSC1 and LSC2). ★★★Transduced cells by MA9 or ICN-1 virus.