Abstract
Background
Cancer stem cells (CSCs), also known as tumor-initiating cells (TICs), are characterized by high self-renewal and multi-lineage differentiation capacities. CSCs are thought to play indispensable roles in the initiation, progression and metastasis of many types of cancer. Leukemias are thought to be initiated and maintained by a specific sub-type of CSC, the leukemia stem cell (LSC). An important feature of LSCs is their resistance to standard therapy, which may lead to relapse. Increasing efforts are aimed at developing novel therapeutic strategies that selectively target LSCs, while sparing their normal counterparts and, thus, minimizing adverse treatment-associated side-effects. These LSC targeting therapies aim to eradicate LSCs through affecting mechanisms that control their survival, self-renewal, differentiation, proliferation and cell cycle progression. Some LSC targeting therapies have already been proven successful in pre-clinical studies and they are now being tested in clinical studies, mainly in combination with conventional treatment regimens.
Conclusions
A growing body of evidence indicates that the selective targeting of LSCs represents a promising approach to improve disease outcome. Beyond doubt, the CSC hypothesis has added a new dimension to the area of anticancer research, thereby paving the way for shaping a new trend in cancer therapy.
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Abbreviations
- HSCs:
-
Hematopoietic stem cells
- HPCs:
-
Hematopoietic progenitor cells
- LSCs:
-
Leukemic stem cells
- AML:
-
Acute myeloid leukemia
- CML:
-
Chronic myeloid leukemia
- ALL:
-
Acute lymphoblastic leukemia
- CML:
-
Chronic myeloid leukemia
- CFCs:
-
Colony-forming cells
- CDC:
-
Complement-dependent cytotoxicity
- ADCC:
-
Antibody-dependent cellular cytotoxicity
- ATP:
-
Adenosine triphosphate
- FLT3:
-
Fms-like tyrosine kinase 3
- ATRA:
-
All-trans retinoic acid
- LXR:
-
Liver X receptor
- DFO:
-
Deferoxamine
- DFX:
-
Deferasirox
- EP:
-
Eltrombopag
- TPO-R:
-
Thrombopoietin receptor
- RNS:
-
Reactive nitrogen species
- BCL-2:
-
B-cell lymphoma 2
- HDAC:
-
Histone deacetylase
- DNMT:
-
DNA methyltransferase
- PRC2:
-
Polycomb repressive complex 2
- NF-kB:
-
Nuclear factor kappa B
- PTL:
-
Parthenolide
- PI3K:
-
Phosphatidylinositol 3 kinase
- DNA-PK:
-
DNA-dependent protein kinase
- MRP1:
-
Multidrug resistance-associated protein 1
- FOXOs:
-
Forkhead transcription factors
- HSPs:
-
Heat shock proteins
- GMPs:
-
Granulocyte macrophage progenitors
- Hh:
-
Hedgehog
- PTCH:
-
Patched
- TICs:
-
Tumor-initiating cells
- TKIs:
-
Tyrosine kinase inhibitors
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Acknowledgments
We would like to thank all our colleagues for the insights that we have attempted to summarize. We apologize to the colleagues whose work could not be cited, owing to space limitations. SB is funded by the Iranian Council for Stem Cell Research and Technology Development (11/77230) and Tarbiat Modares University, Tehran, Iran. MLG is funded by the Irma T. Hirschl/Monique Weill-Caulier Trust, the US National Institutes of Health (NIH) (R01 CA172546; 5R01CA102031), and the Leukemia and Lymphoma Foundation. ACG is funded by the Instituto de Bebidas para la Salud y el Bienestar, México and the Fundación IMSS, México.
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Chavez-Gonzalez, A., Bakhshinejad, B., Pakravan, K. et al. Novel strategies for targeting leukemia stem cells: sounding the death knell for blood cancer. Cell Oncol. 40, 1–20 (2017). https://doi.org/10.1007/s13402-016-0297-1
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DOI: https://doi.org/10.1007/s13402-016-0297-1