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Hypercholesterolemia alters endotoxin-induced endothelial cell adhesion molecule expression
W H Cerwinka1, M H Cheema, D N Granger
1Department of Molecular and Cellular Physiology, Louisiana State University Health Sciences Center, Shreveport 71130-3932, USA.
Shock (Augusta, Ga.)
|July 10, 2001
Summary
High cholesterol (hypercholesterolemia) increases inflammation by enhancing endothelial cell adhesion molecule expression and tumor necrosis factor-alpha levels in rats, making tissues more susceptible to endotoxin effects.
Area of Science:
- Cardiovascular Biology
- Inflammation Research
- Endothelial Cell Biology
Background:
- Hypercholesterolemia is linked to increased inflammation susceptibility.
- Mechanisms underlying this exaggerated inflammatory response are not fully understood.
Purpose of the Study:
- To assess hypercholesterolemia's influence on endotoxin-induced endothelial cell adhesion molecule (CAM) expression.
- To determine if altered CAM expression correlates with plasma cytokine changes.
Main Methods:
- Rats were fed normal or high-cholesterol diets for 3 weeks.
- Dual radiolabeled monoclonal antibody technique measured CAMs (P-selectin, E-selectin, ICAM-1, VCAM-1) after endotoxin (LPS) injection.
- Plasma cytokine levels (TNF-alpha, IL-1beta) were analyzed.
Main Results:
- LPS increased all endothelial CAMs in both groups.
- Hypercholesterolemia enhanced LPS-induced P-selectin, E-selectin, and ICAM-1 expression.
- VCAM-1 expression was unaffected; platelet depletion did not alter P-selectin response.
- Hypercholesterolemia amplified LPS-induced TNF-alpha, but not IL-1beta.
Conclusions:
- Hypercholesterolemia enhances LPS-induced endothelial CAM expression and TNF-alpha levels in rats.
- This suggests hypercholesterolemia increases tissue vulnerability to inflammatory effects of LPS.