Endothelial cells form the single-cell inner lining of all blood vessels and lymphatic vessels, creating a selective barrier between circulating blood and underlying tissues. These cells are metabolically active, using aerobic glycolysis for biomass production, and serve as critical regulators of immune cell trafficking, inflammation, and vascular tone.
Endothelial cells express adhesion molecules (VCAM-1, selectins) that facilitate leukocyte recruitment during inflammation. They respond to inflammatory signals (IL-1, TNF-Ξ±, LPS) by upregulating these molecules and producing chemokines (IL-8, CXCL1) to attract neutrophils and other immune cells. They maintain barrier function through tight junctions and regulate permeability in response to bradykinin, histamine, and VEGF. Endothelial cells are also major sites of eicosanoid and SPM production via COX and LOX enzymes. During postprandial lipemia (>40g fat per meal), they experience oxidative stress and inflammatory activation from elevated triglycerides and free fatty acids.
Endothelial dysfunction is a hallmark of metabolic syndrome, atherosclerosis, and chronic inflammation. High-fat meals (>40g) trigger endothelial activation and postprandial lipemia, contributing to low-grade inflammation. Endothelial cells are targets for therapeutic interventions including omega-3 fatty acids, polyphenols, and intermittent fasting to improve vascular health and reduce cardiovascular disease risk.
- Only dividing cells (immune cells, endothelial cells, fibroblasts, keratinocytes) can sustain glycolysis for biomass production
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40g fat per meal triggers significant postprandial lipemia and endothelial activation
- Endothelial cells produce IL-8 and CXCL1 to recruit neutrophils during inflammation
- Express pattern recognition receptors (TLRs) that respond to PAMPs and DAMPs
- Can switch from quiescent to activated phenotype within hours of inflammatory stimulation
- Are primary sites of leukocyte extravasation in lymphoid sinuses and peripheral tissues
- IL-8 β produce this neutrophil chemoattractant during inflammation
- CXCL1 β secrete this chemokine to recruit immune cells
- VCAM-1 β upregulate this adhesion molecule for leukocyte trafficking
- postprandial lipemia β undergo oxidative stress during postprandial lipemia from high-fat meals
- free fatty acids β activated by elevated free fatty acids after fat consumption
- triglycerides β respond to elevated triglycerides with inflammatory activation
- neutrophils β recruit neutrophils via chemokine production
- macrophages β facilitate macrophage extravasation through adhesion molecules
- T cells β regulate T cell trafficking into tissues
- blood-brain barrier β specialized endothelial cells form the blood-brain barrier
- Aerobic Glycolysis β rely on aerobic glycolysis for energy and biomass during division
- fibroblasts β coordinate with fibroblasts during wound healing and tissue repair
- keratinocytes β similar metabolic profile using glycolysis for biomass production
- TNF-Ξ± β activated by TNF-Ξ± to upregulate adhesion molecules
- IL-1 β respond to IL-1 with inflammatory gene expression
- LPS β recognize LPS via TLR4 triggering inflammatory responses
- atherosclerosis β endothelial dysfunction is early event in atherosclerosis development
- Nitric Oxide β produce nitric oxide for vasodilation and anti-inflammatory effects
- omega-3 fatty acids β protected by omega-3s which reduce endothelial activation
- intermittent fasting β benefit from fasting periods which reduce postprandial stress
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