Related Experiment Video
Updated: Sep 19, 2026
Identification and Isolation of Slow-Dividing Cells in Human Glioblastoma Using Carboxy Fluorescein Succinimidyl Ester CFSE
Published on: April 29, 2012
Defining phenotypic and functional heterogeneity of glioblastoma stem cells by mass cytometry
Luciano Galdieri1, Arijita Jash1, Olga Malkova2
1Department of Medicine.
Abstract:
Most patients with glioblastoma (GBM) die within 2 years. A major therapeutic goal is to target GBM stem cells (GSCs), a subpopulation of cells that contribute to treatment resistance and recurrence. Since their discovery in 2003, GSCs have been isolated using single-surface markers, such as CD15, CD44, CD133, and α6 integrin. It remains unknown how these single-surface marker-defined GSC populations compare with each other in terms of signaling and function and whether expression of different combinations of these markers is associated with different functional capacity. Using mass cytometry and fresh operating room specimens, we found 15 distinct GSC subpopulations in patients, and they differed in their MEK/ERK, WNT, and AKT pathway activation status. Once in culture, some subpopulations were lost and previously undetectable ones materialized. GSCs that highly expressed all 4 surface markers had the greatest self-renewal capacity, WNT inhibitor sensitivity, and in vivo tumorigenicity. This work highlights the potential signaling and phenotypic diversity of GSCs. Larger patient sample sizes and antibody panels are required to confirm these findings.
Insights
Glioblastoma stem cells (GSCs) show diverse signaling and function. GSCs expressing all four surface markers had the highest self-renewal, WNT inhibitor sensitivity, and tumorigenicity, suggesting therapeutic potential.
Area of Science:
- Neuro-oncology
- Cancer Stem Cell Biology
Background:
- Glioblastoma (GBM) is highly lethal, with most patients dying within 2 years.
- GBM stem cells (GSCs) drive treatment resistance and recurrence.
- Current GSC isolation relies on single surface markers (e.g., CD15, CD44, CD133, α6 integrin), but their functional and signaling differences are unclear.
Purpose of the Study:
- To investigate the signaling and functional diversity among GSC subpopulations defined by combinations of surface markers.
- To compare the characteristics of GSCs expressing different surface marker profiles.
Main Methods:
- Utilized mass cytometry on fresh operating room glioblastoma specimens.
- Analyzed 15 distinct GSC subpopulations for pathway activation (MEK/ERK, WNT, AKT).
- Monitored GSC subpopulations in culture to observe changes over time.
Main Results:
- Identified 15 distinct GSC subpopulations with varying pathway activation statuses.
- Observed dynamic changes in GSC subpopulations upon culturing.
- GSCs expressing all four markers (CD15, CD44, CD133, α6 integrin) exhibited superior self-renewal, WNT inhibitor sensitivity, and in vivo tumorigenicity.
Conclusions:
- Glioblastoma stem cells display significant signaling and phenotypic diversity.
- Combinations of surface markers may define GSCs with distinct functional capacities.
- Further validation with larger patient cohorts and expanded antibody panels is warranted.
More Related Videos
08:14Processing of Primary Brain Tumor Tissue for Stem Cell Assays and Flow Sorting
Published on: September 25, 2012
10:28Flow Cytometry-based Drug Screening System for the Identification of Small Molecules That Promote Cellular Differentiation of Glioblastoma Stem Cells
Published on: January 10, 2018
