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Brain angiogenesis: variations in vascular basement membrane glycoprotein immunoreactivity
J M Krum1, N S More, J M Rosenstein
1Department of Anatomy, George Washington University Medical Center, Washington, D.C. 20037.
Experimental Neurology
|February 1, 1991
Summary
Investigating laminin and fibronectin in CNS blood vessels reveals changes during development and regeneration. Immature basement membranes show distinct reactivity, suggesting differences in molecular composition and accessibility.
Area of Science:
- Neuroscience
- Developmental Biology
- Vascular Biology
Background:
- The basement membrane is crucial for blood vessel development and function.
- Laminin and fibronectin are key extracellular matrix proteins in basement membranes.
- Understanding their dynamics in the central nervous system (CNS) is vital for studying neurodevelopment and injury repair.
Purpose of the Study:
- To investigate changes in laminin and fibronectin distribution in CNS blood vessel basement membranes during development and regeneration.
- To compare basement membrane composition in normal development versus injury/transplant models.
- To explore the accessibility of basement membrane antigens in immature versus mature CNS vasculature.
Main Methods:
- Utilized two immunocytochemical techniques to detect laminin and fibronectin.
- Studied three models: normal CNS development, wound healing, and fetal neocortical transplants.
- Employed paraffin and vibratome sectioning with and without enzymatic pretreatment.
Main Results:
- Developing and regenerating CNS vessels showed intense laminin and fibronectin staining without enzymatic pretreatment.
- Mature CNS vasculature required enzymatic treatment for significant staining, except for meninges and circumventricular organs.
- Staining intensity decreased as vessels matured and formed complete basement membranes with astrocytic contact.
Conclusions:
- Immature CNS vascular basement membranes exhibit altered molecular configurations or accessibility compared to mature ones.
- Enzymatic pretreatment is not always necessary for detecting basement membrane components in developing or regenerating CNS vasculature.
- These findings highlight dynamic changes in basement membrane composition during CNS angiogenesis and repair.