Preferential Iron Trafficking Characterizes Glioblastoma Stem-like Cells
David L Schonberg1, Tyler E Miller1, Qiulian Wu1
1Department of Stem Cell Biology and Regenerative Medicine, Cleveland Clinic, Cleveland, OH 44195, USA.
Cancer Cell
|October 14, 2015
Summary
Glioblastoma cancer stem cells (CSCs) depend on iron for growth. Targeting iron uptake via transferrin and ferritin disrupts CSCs, revealing a novel therapeutic vulnerability.
Area of Science:
- Oncology
- Molecular Biology
- Biochemistry
Background:
- Glioblastomas (GBMs) exhibit a hierarchical structure with self-renewing cancer stem-like cells (CSCs).
- Understanding the unique regulatory mechanisms of GBM CSCs is crucial for developing targeted therapies.
Purpose of the Study:
- To identify and characterize the regulatory programs and metabolic dependencies specific to glioblastoma cancer stem cells.
- To investigate the role of iron metabolism in CSC propagation and tumor formation.
Main Methods:
- RNA sequencing and enhancer mapping to identify differentially expressed genes in CSCs.
- Assays to quantify and analyze iron uptake and flux in CSCs and other tumor cells.
- In vivo tumor formation studies and genetic manipulation to assess the impact of iron regulators.
Main Results:
- Transferrin, an iron transporter, was identified as the top upregulated gene in CSCs compared to progenitors.
- CSCs exhibit enhanced iron extraction capabilities from their microenvironment.
- CSCs critically depend on transferrin receptor and ferritin for propagation and tumor growth in vivo.
- Ferritin depletion disrupts CSC mitotic progression via the STAT3-FoxM1 pathway, highlighting an iron-regulated CSC pathway.
Conclusions:
- Glioblastoma CSCs possess a targetable, epigenetically programmed dependence on iron.
- Iron metabolism, particularly via transferrin and ferritin, represents a promising therapeutic target for glioblastoma treatment.
