Three-dimensional vascular microenvironment landscape in human glioblastoma

Area of Science:

• Neuro-oncology
• Cancer Biology
• Immunology

Background:

• Glioblastoma (GBM) microenvironment complexity remains poorly understood.
• Cell-resolution analysis of human GBM tissue is crucial for biological insights.

Purpose of the Study:

• To present a detailed 3D visualization of human GBM cellular composition.
• To investigate the association between GBM and its neo-vascular niche.

Main Methods:

• 3D visualization of human GBM biopsies.
• High-resolution analysis of vascular structures and the blood-brain barrier.
• Examination of T cell and myeloid cell distribution and phenotypes.

Main Results:

• Revealed complex vascular maps with increased heterogeneity and altered spatial relationships.
• Demonstrated multilayered fenestration of the blood-brain barrier.
• Observed increased T cell infiltration and volumetric increase of glioma-associated microglia and macrophages correlating with GBM proliferation.
• Identified distinct myeloid cell phenotypes in tumor nests and stroma.

Conclusions:

• Detailed cellular and vascular insights into human GBM.
• Highlights the role of the neo-vascular niche and immune cell infiltration in GBM progression.
• Provides a valuable resource for further GBM research.