[Glial stem cells and their relationship with tumour angiogenesis process]

Area of Science:

• Neuro-oncology
• Cancer Stem Cell Biology
• Tumor Angiogenesis

Background:

• Neoplastic cells with stem cell characteristics, termed glial stem cells, are found in human glioblastomas.
• These cells are implicated in tumor angiogenesis, malignancy, infiltration, and recurrence due to their resistance to therapy.

Purpose of the Study:

• To review the role of glial stem cells in angiogenesis.
• To examine the appearance of glial stem cells during angiogenesis in an experimental glioma model.

Main Methods:

• Review of literature on glial stem cells and angiogenesis.
• Characterization of cells using antibodies for CD133, nestin, and vascular endothelial growth factor (VEGF) in a rat glioma model.
• Analysis of cell distribution in hypoxic areas.

Main Results:

• Nestin+ cells were present throughout tumor development.
• CD133+ cells emerged at intermediate stages with VEGF overexpression, coinciding with the angiogenic switch.
• Some nestin+ cells co-expressed CD133, and glial stem cells formed niches in perivascular and hypoxic regions.

Conclusions:

• Glial stem cells are closely associated with the angiogenic switch.
• Evidence supports a link between glial stem cells, intratumoral hypoxia, and the tumor's vascular network.