Using conditional knockout and reporter mouse models, the authors demonstrated that tumor cells expressing the Notch ligand Dll1 was important for tumor growth and metastasis and bear similarities to tumor-initiating cancer cells in breast cancer.
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Kumar, S., Nandi, A., Singh, S., Regulapati, R., Li, N., Tobias, J. W., Siebel, C. W., Blanco, M. A., Klein-Szanto, A. J., Lengner, C., Welm, A. L., Kang, Y., & Chakrabarti, R. (2021). Dll1 + quiescent tumor stem cells drive chemoresistance in breast cancer through NF-κB survival pathway. Nature Communications, 12(1), 432. https://doi.org/10.1038/s41467-020-20664-5 Cite
Levels of Nanog and activated Akt were significantly higher in sarcoma cells grown as spheroids or sorted for CD133 expression to enrich for cancer stem cells.
By generating stable human lung cancer stem cell (CSC) cell lines with the wild-type TP53, as well as cell lines in which TP53 was deleted, the authors showed, for the first time, that autophagy augments the stemness of lung CSCs by degrading ubiquitinated p53.
[Cell Death & Disease]
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The enhanced long noncoding RNA KB-1980E6.3 facilitated breast cancer stem cells self-renewal and tumorigenesis under hypoxic microenvironment both in vitro and in vivo.
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Zhu, P., He, F., Hou, Y., Tu, G., Li, Q., Jin, T., Zeng, H., Qin, Y., Wan, X., Qiao, Y., Qiu, Y., Teng, Y., & Liu, M. (2021). A novel hypoxic long noncoding RNA KB-1980E6.3 maintains breast cancer stem cell stemness via interacting with IGF2BP1 to facilitate c-Myc mRNA stability. Oncogene, 1–19. https://doi.org/10.1038/s41388-020-01638-9 Cite
Calcitonin receptor-like receptor (CALCRL) knockdown impaired leukemic growth, decreased leukemic stem cell frequency, and sensitized to cytarabine in patient-derived xenograft models.
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Larrue, C., Guiraud, N., Mouchel, P.-L., Dubois, M., Farge, T., Gotanègre, M., Bosc, C., Saland, E., Nicolau-Travers, M.-L., Sabatier, M., Serhan, N., Sahal, A., Boet, E., Mouche, S., Heydt, Q., Aroua, N., Stuani, L., Kaoma, T., Angenendt, L., … Sarry, J.-E. (2021). Adrenomedullin-CALCRL axis controls relapse-initiating drug tolerant acute myeloid leukemia cells. Nature Communications, 12(1), 422. https://doi.org/10.1038/s41467-020-20717-9 Cite
Overexpression of decorin in inflammatory breast cancer (IBC) cells markedly decreased migration, invasion, and cancer stem cells in vitro and inhibited tumor growth and metastasis in IBC xenograft mouse models.
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Hu, X., Villodre, E. S., Larson, R., Rahal, O. M., Wang, X., Gong, Y., Song, J., Krishnamurthy, S., Ueno, N. T., Tripathy, D., Woodward, W. A., & Debeb, B. G. (2021). Decorin-mediated suppression of tumorigenesis, invasion, and metastasis in inflammatory breast cancer. Communications Biology, 4(1), 1–14. https://doi.org/10.1038/s42003-020-01590-0 Cite
Investigators review the research progress made in the isolation and characterization of liver cancer stem cells by considering a wide range of cell surface markers and sorting methods, as applied to side populations, microsphere cultures and the gradient centrifugation method.
[Stem Cell Reviews and Reports]
To determine how CD117 expression and activation by its ligand stem cell factor alters prostate cancer aggressiveness, researchers used C4-2 and PC3-mm human prostate cancer cells, which contained a CD117+ subpopulation.
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Harris, K. S., Shi, L., Foster, B. M., Mobley, M. E., Elliott, P. L., Song, C. J., Watabe, K., Langefeld, C. D., & Kerr, B. A. (2021). CD117/c-kit defines a prostate CSC-like subpopulation driving progression and TKI resistance. Scientific Reports, 11(1), 1465. https://doi.org/10.1038/s41598-021-81126-6 Cite
The authors found that interfering with expression of the receptor for the lactogenic hormone prolactin in breast cancer cells representative of the luminal and epithelial breast cancer subtypes resulted in loss of their differentiation state, enriched for stem-like cell subpopulations, and increased their tumorigenic capacity in a subtype-specific manner.
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Shams, A., Binothman, N., Boudreault, J., Wang, N., Shams, F., Hamam, D., Tian, J., Moamer, A., Dai, M., Lebrun, J.-J., & Ali, S. (2021). Prolactin receptor-driven combined luminal and epithelial differentiation in breast cancer restricts plasticity, stemness, tumorigenesis and metastasis. Oncogenesis, 10(1), 1–16. https://doi.org/10.1038/s41389-020-00297-5 Cite
Investigators found that high expression of desmoglein2, a component of desmosome-mediated intercellular adhesion complexes, promoted tumor growth, increased the prevalence of circulating tumor cell clusters, and facilitated distant organ colonization.
[Proceedings of the National Academy of Sciences of the United States of America]
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Chang, P.-H., Chen, M.-C., Tsai, Y.-P., Tan, G. Y. T., Hsu, P.-H., Jeng, Y.-M., Tsai, Y.-F., Yang, M.-H., & Hwang-Verslues, W. W. (2021). Interplay between desmoglein2 and hypoxia controls metastasis in breast cancer. Proceedings of the National Academy of Sciences, 118(3). https://doi.org/10.1073/pnas.2014408118 Cite
The authors performed an in silico study of ADAMTS1 and endothelial markers in human gliomas, providing the basis to further assess these molecules in several primary glioblastoma-initiating cells and established glioblastoma cells with the ability to acquire an endothelial-like phenotype.
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