Scavenger receptors that recognize advanced glycation end products.
Scavenger receptors recognize modified low-density lipoproteins (LDLs) such as acetylated LDL and oxidized LDL. Advanced glycation end products (AGE), which are generated through long-term exposure of proteins to glucose, also behave as active ligands for some scavenger receptors, including class A scavenger receptor (SR-A) and class B scavenger receptors such as CD36 and scavenger receptor, class B, type I (SR-BI). SR-BI, the first identified high-density lipoprotein (HDL) receptor, plays key roles in reverse cholesterol transport by promoting selective uptake of cholesteryl esters (CE) in HDL by hepatocytes, and cholesterol efflux of unesterified cholesterol from peripheral cells to HDL. Using Chinese hamster ovary cells overexpressing SR-BI (CHO-SR-BI cells), it was demonstrated that AGE-bovine serum albumin binds to SR-BI and inhibits selective uptake of HDL-CE by CHO-SR-BI cells as well as cholesterol efflux from CHO-SR-BI cells to HDL, suggesting potential roles of AGE in diabetic dyslipidemia and accelerated atherosclerosis in diabetes.
Miyazaki
Akira
A
Department of Biochemistry, Kumamoto University School of Medicine, Honjo, Kumamoto, Japan. akiramyz@kaiju.medic.kumamoto-u.ac.jp
Nakayama
Hitoshi
H
Horiuchi
Seikoh
S
D000818:Animals; D018955:CD36 Antigens; D006224:Cricetinae; D004195:Disease Models, Animal; D017127:Glycation End Products, Advanced / Q000502:physiology*; D006801:Humans; D006949:Hyperlipidemias / Q000503:physiopathology*; D066298:In Vitro Techniques; D008565:Membrane Proteins; D011971:Receptors, Immunologic / Q000502:physiology*; D018110:Receptors, Lipoprotein; D051116:Receptors, Scavenger; D051117:Scavenger Receptors, Class A; D051122:Scavenger Receptors, Class B
D018955:CD36 Antigens; D017127:Glycation End Products, Advanced; D008565:Membrane Proteins; D011971:Receptors, Immunologic; D018110:Receptors, Lipoprotein; D051116:Receptors, Scavenger; C495124:SCARB1 protein, human; C454739:Scarb1 protein, mouse; D051117:Scavenger Receptors, Class A; D051122:Scavenger Receptors, Class B