Glioma Cell Migration Dynamics in Brain Tissue Assessed by Multimodal Optical Imaging.

Area of Science:

• Neuro-oncology
• Cellular Biology
• Biophysics

Background:

• Glioblastoma invasion follows white matter tracts and vasculature.
• Understanding glioma cell migration routes is crucial for developing anti-invasive therapies.

Purpose of the Study:

• To systematically quantify the migration routes and motility of U251 human glioblastoma cells in mouse brain slices.
• To investigate the preferred invasion pathways and migration dynamics of glioma cells in different brain regions.

Main Methods:

• Multimodal imaging combining polarization-sensitive optical coherence tomography (PS-OCT) and confocal fluorescence microscopy.
• PS-OCT for delineating nerve fiber tracts.
• Confocal microscopy for imaging cell migration and brain vasculature.

Main Results:

• U251 glioma cells preferentially migrate along vasculature in both gray and white matter, contrary to expectations.
• Cell motility was significantly higher in gray matter (91 μm²/h) compared to white matter (43 μm²/h).
• U251 cells exert traction forces on the vasculature, suggesting a "motor-clutch" migration model.

Conclusions:

• Glioma cell invasion is not solely dependent on white matter tracts.
• Vasculature serves as a primary route for glioblastoma invasion in both gray and white matter.
• Anti-invasive strategies should target both perivascular and televascular invasion pathways.