The astrocytic response towards invasive meningiomas
L Zeltner1, J Schittenhelm, M Mittelbronn
1Institute of Brain Research, University of Tübingen, Tübingen, Germany.
Neuropathology and Applied Neurobiology
|March 16, 2007
Summary
Subpial astrocytes disappear as brain-invasive meningiomas infiltrate, suggesting their survival depends on an intact pial-glial basement membrane. This study examined astrocyte presence and basement membrane integrity in various meningioma grades.
Area of Science:
- Neuroscience
- Oncology
- Cell Biology
Background:
- Meningiomas can invade brain tissue, disrupting the pial-glial basement membrane.
- The behavior of subpial astrocytes at the tumor-brain interface during invasion is not well understood.
Purpose of the Study:
- To investigate the fate of subpial astrocytes and the integrity of the basement membrane in brain-invasive meningiomas.
- To correlate astrocyte presence and basement membrane status with meningioma grade (WHO I, II, III).
Main Methods:
- Immunolabeling of 35 brain-invasive meningioma samples (WHO grades I, II, III).
- Used anti-collagen IV for basement membrane, and CD44, SPARC, GFAP for astrocytic markers.
- Analyzed astrocyte presence and basement membrane integrity at the tumor-brain interface and in deep brain parenchyma.
Main Results:
- Astrocytes were present at the tumor-brain interface in most meningiomas across all WHO grades.
- Astrocyte presence correlated with an intact basement membrane in lower-grade meningiomas.
- Meningiomas invading deep brain parenchyma lacked both astrocytes and basement membrane material.
Conclusions:
- Subpial astrocytes disappear from the tumor-brain interface during meningioma infiltration.
- The survival of subpial astrocytes may be dependent on an intact pial-glial basement membrane.
