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Lipid mediators that modulate the extracellular matrix structure and function in vascular cells.
G Camejo1, E Hurt-Camejo, U Olsson
1AstraZeneca Preclinical Research Laboratories, Mölndal, S-431 83, Sweden.
Current Atherosclerosis Reports
|December 21, 2000
Summary
Moderate nonesterified fatty acids (NEFA) alter vascular cell proteoglycans, increasing albumin permeability and LDL affinity. These changes may contribute to complications in conditions like type 2 diabetes.
Area of Science:
- Biochemistry
- Cell Biology
- Vascular Biology
Background:
- Nonesterified fatty acids (NEFA) bound to albumin are implicated in vascular pathologies.
- Proteoglycans play crucial roles in vascular structure and function.
Purpose of the Study:
- To investigate the effects of NEFA-albumin complexes on proteoglycan structure and function in endothelial and smooth muscle cells.
- To explore the potential role of peroxisome proliferator-activated receptor gamma (PPARg) in mediating these effects.
- To assess the impact on the extracellular matrix and its affinity for low-density lipoproteins (LDLs).
Main Methods:
- Treatment of endothelial and smooth muscle cell cultures with NEFA-albumin complexes.
- Analysis of proteoglycan structure, sulfation, and gene expression.
- Investigation of PPARg involvement.
- Assessment of matrix-LDL binding affinity.
Main Results:
- NEFA-albumin treatment reduced heparan sulfate proteoglycans in endothelial cells, increasing albumin permeability.
- In smooth muscle cells, NEFA-albumin upregulated core protein gene expression for syndecan, decorin, and perlecan, potentially via PPARg.
- The resulting extracellular matrix exhibited increased affinity for LDLs.
Conclusions:
- NEFA-albumin complexes induce significant alterations in vascular cell proteoglycans.
- These modifications may enhance LDL binding and contribute to vascular complications in dyslipidemias, such as type 2 diabetes.