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DNA fragmentation in central nervous system vascular malformations.
Y Takagi1, I Hattori, K Nozaki
1Department of Neurosurgery, Kitano Hospital Medical Institute, Osaka, Japan.
Acta Neurochirurgica
|November 22, 2000
Summary
Apoptosis, or programmed cell death, is key in central nervous system vascular malformations. DNA fragmentation and Caspase-3 indicate apoptosis contributes to vascular remodeling in these lesions.
Area of Science:
- Neuroscience
- Cell Biology
- Pathology
Background:
- Apoptosis is increasingly recognized for its role in vascular remodeling.
- Central nervous system (CNS) vascular malformations are complex lesions with potential for recurrence and hemorrhage.
Purpose of the Study:
- To investigate the presence and distribution of apoptosis in CNS vascular malformations.
- To determine if apoptosis-related mechanisms contribute to the pathogenesis of arteriovenous malformations (AVMs) and cavernous hemangiomas (CHs).
Main Methods:
- In situ end labeling (ISEL) was used to detect DNA fragmentation, a marker of apoptosis.
- Immunohistochemistry was employed to assess Caspase-3 expression, an apoptosis-related protein.
- Specimens from 15 AVMs and 5 CHs were analyzed.
Main Results:
- DNA fragmentation was detected in all examined AVM and CH specimens.
- ISEL-positive cells and Caspase-3 immunoreactivity were predominantly found in the endothelium, media, and perivascular tissues of AVMs.
- In CHs, ISEL-positive cells and Caspase-3 were observed in the endothelium, subendothelium, and intercavernous matrix.
Conclusions:
- Apoptotic cell death is a significant feature of CNS vascular malformations.
- Vascular remodeling through apoptosis appears to play a crucial role in the development and maintenance of these lesions.