Sox2 Cooperates with Inflammation-Mediated Stat3 Activation in the Malignant Transformation of Foregut Basal Progenitor Cells Scientists used mouse genetic models to reveal a mechanism by which Sox2 cooperates with microenvironmental signals to malignantly transform epithelial progenitor cells. Their findings indicated that basal stem/progenitor cells are the cells of origin of squamous carcinoma and that cooperation between Sox2 and microenvironment-activated Stat3 is required for Sox2-driven tumorigenesis. [Cell Stem Cell] Abstract | Graphical Abstract Differential Expression Profiles of Glycosphingolipids in Human Breast Cancer Stem Cells vs. Cancer Non-Stem Cells Researchers analyzed glycosphingolipids expressed in human breast cancer stem cells (CSCs) by applying a CSC model induced through epithelial-mesenchymal transition, using mass spectrometry, TLC immunostaining, and cell staining. [Proc Natl Acad Sci USA] Abstract Canonical and Non-Canonical NF-κB Signaling Promotes Breast Cancer Tumor-Initiating Cells Investigators explored the potential involvement of the nuclear factor-κB (NF-κB) family of transcription factors in tumor-initiating cells in cell lines that are representative of basal-like and claudin-low breast cancer. [Oncogene] Abstract An Endogenous Inhibitor of Angiogenesis Inversely Correlates with Side Population Phenotype and Function in Human Lung Cancer Cells The side population (SP) in human lung cancer cell lines and tumors is enriched with cancer stem cells. Here researchers examined the hypothesis that tissue inhibitor of matrix metalloproteinase-2 antitumor activity may involve regulation of the SP in human lung cancer cells. [Oncogene] Abstract Estrogen Increases the Activity of Estrogen Receptor-Negative Breast Cancer Stem Cells through Paracrine EGFR and Notch Signaling Scientists tested the effects of estrogen on cancer stem cell activity in vitro and in vivo and investigated which paracrine signaling pathways locally mediate estrogen effects. [Breast Cancer Res] Abstract | Full Article Identification and Characterization of Cells with Cancer Stem Cell Properties in Human Primary Lung Cancer Cell Lines Results indicated that CD44highCD90+ sub-population may represent cancer stem cells (CSCs) in small cell lung cancer and large cell carcinoma, whereas in squamous cell carcinoma lung cancer subtype, CSC potentials were found within the CD44high sub-population. [PLoS One] Full Article Vascular Endothelial Growth Factor Receptor 2 (VEGFR-2) Plays a Key Role in Vasculogenic Mimicry Formation, Neovascularization and Tumor Initiation by Glioma Stem-Like Cells The authors report a critical role of glioma stem-like cells (GSLCs) in the formation of vasculogenic mimicry (VM), which defines channels lined by tumor cells to supply nutrients to early growing tumors and tumor initiation. GSLCs preferentially expressed VEGFR-2 that upon activation by VEGF, mediated chemotaxis, tubule formation and increased expression of critical VM markers by GSLCs. [PLoS One] Full Article Tumor-Infiltrating Immune Cells: Triggers for Tumor Capsule Disruption and Tumor Progression? Aberrant immune cell infiltration may have the same destructive impact on the capsule of all epithelium-derived tumors. This, in turn, may selectively favor the proliferation of tumor stem or progenitor cells overlying these focal disruptions. These proliferating epithelial tumor cells subsequently disseminate from the focal disruption leading to tumor invasion and metastasis. [Int J Med Sci] Full Article |