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Endothelial scavenger receptors.
Hideki Adachi1, Masafumi Tsujimoto
1Laboratory of Cellular Biochemistry, RIKEN, Saitama 351-0198, Japan. adachih@riken.jp
Progress in Lipid Research
|May 23, 2006
Summary
Endothelial scavenger receptors, including SR-BI, CD36, and LOX-1, bind to modified lipoproteins and other molecules. These receptors play roles in lipid metabolism, innate immunity, and infection.
Area of Science:
- Endothelial biology
- Molecular biology
- Immunology
Background:
- Endothelial scavenger receptors bind negatively charged molecules like acetylated low-density lipoproteins (Ac-LDL).
- Key receptors include scavenger receptor class B type I (SR-BI), CD36, and lectin-like oxidized LDL receptor-1 (LOX-1).
Purpose of the Study:
- To review the structure and function of endothelial scavenger receptors.
- To highlight their roles in lipid metabolism, innate immunity, and infection.
Main Methods:
- Expression cloning using modified low-density lipoproteins (LDL) as ligands.
- Characterization of receptor-ligand interactions.
- Utilizing genetically manipulated rodent models and forward genetic screening.
Main Results:
- SR-BI acts as a high-density lipoprotein (HDL) receptor.
- CD36 is a multi-ligand receptor binding oxidized LDLs (Ox-LDL), thrombospondin, and pathogens.
- LOX-1 mediates Ox-LDL actions in vascular walls.
Conclusions:
- Endothelial scavenger receptors are crucial for lipid metabolism.
- These receptors are involved in innate immunity and host defense against infection.