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Cell adhesion molecule expression in cultured human iris endothelial cells.
M D Silverman1, D O Zamora, Y Pan
1Department of Ophthalmology, Casey Eye Institute, Portland, OR, USA.
Investigative Ophthalmology & Visual Science
|November 1, 2001
Summary
Researchers isolated human iris microvascular endothelial cells (HIECs) and studied their expression of adhesion molecules. Inflammatory agents upregulated key molecules like ICAM-1, VCAM-1, and E-selectin, impacting leukocyte adhesion.
Area of Science:
- Ocular immunology
- Endothelial cell biology
- Vascular inflammation
Background:
- Anterior ocular inflammation involves adhesion molecules.
- Understanding endothelial cell responses is crucial for ocular health.
Purpose of the Study:
- To develop a method for isolating human iris microvascular endothelial cells (HIECs).
- To investigate the expression of intercellular adhesion molecule (ICAM)-1 and -2, vascular cell adhesion molecule (VCAM)-1, and E-selectin in HIECs.
- To determine how inflammatory agents modulate this expression.
Main Methods:
- Isolation of HIECs using PECAM-1 expression and magnetic beads.
- Characterization of HIECs via morphology, PECAM-1, von Willebrand factor, acetylated LDL uptake, and capillary network formation.
- Analysis of adhesion molecule expression using RT-PCR, ELISAs, Western blot, and leukocyte adhesion assays.
Main Results:
- HIECs constitutively expressed ICAM-1 and ICAM-2 mRNA and protein.
- VCAM-1 and E-selectin were expressed at low or undetectable levels initially.
- Endotoxin or TNF-alpha stimulation potently upregulated ICAM-1, VCAM-1, and E-selectin, increasing leukocyte adhesion.
- ICAM-2 was downregulated but remained functional.
Conclusions:
- Successfully isolated and characterized HIECs.
- Demonstrated differential expression and regulation of ICAM-1, VCAM-1, and E-selectin in HIECs.
- Provided the first evidence of regulated ICAM-2 expression in ocular microvascular cells.