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Ultrastructural localization of lectin binding sites in the developing brain microvasculature
B Nico1, F Quondamatteo, D Ribatti
1Institute of Human Anatomy, Histology and Embryology, University of Bari, Italy.
Anatomy and Embryology
|June 13, 1998
Summary
Lectins reveal how optic tectum microvasculature develops polarity. Beta-D-galactose residues are key to blood-brain barrier formation in developing chickens.
Area of Science:
- Neuroscience
- Developmental Biology
- Cell Biology
Background:
- The optic tectum's microvasculature is crucial for blood-brain barrier (BBB) formation.
- Understanding endothelial cell development and polarity is key to BBB differentiation.
Purpose of the Study:
- To investigate the temporo-spatial distribution of lectin-binding sites in the developing optic tectum microvasculature.
- To identify the role of specific glycoconjugates in the differentiation of the blood-brain barrier.
Main Methods:
- Lectin histochemistry using Ricinus communis agglutinin-I (RCA-I) and Wheat germ agglutinin (WGA) labeled with horseradish peroxidase or colloidal gold.
- Light and electron microscopy to visualize lectin binding sites in embryonic and adult chicken optic tectum.
- Quantitative analysis of lectin binding patterns.
Main Results:
- RCA-I binding sites shifted from diffuse to abluminal surfaces, localizing to tight junctions and basement membranes in later stages.
- Wheat germ agglutinin (WGA) binding sites were consistently found on the luminal endothelial surface from early embryonic development.
- Intracytoplasmic RCA-I labeling was observed in early embryos, suggesting initial intracellular processing.
Conclusions:
- Optic tectum endothelial cells acquire functional polarity early in development.
- Beta-D-galactose-containing glycoconjugates are integral components of tight junctions and basement membranes, crucial for BBB development.