Lysophosphatidic acid-independent platelet activation by low-density lipoprotein

Platelet activation by oxidized low density lipoprotein is mediated by CD36 and scavenger receptor-A.

OBJECTIVE The interaction of platelets with low density lipoprotein (LDL) contributes to the development of cardiovascular disease. Platelets are activated by native LDL (nLDL) through apoE Receptor 2' (apoER2')-mediated signaling to p38(MAPK) and by oxidized LDL (oxLDL) through lysophosphatidic acid (LPA) signaling to Rho A and Ca2+. Here we report a new mechanism for platelet activation by ox...

A specific CD36-dependent signaling pathway is required for platelet activation by oxidized low-density lipoprotein.

Platelet hyperactivity associated with hyperlipidemia may contribute to development of a prothrombotic state. We previously showed that oxidized low-density lipoprotein (oxLDL) formed in the setting of hyperlipidemia and atherosclerosis activated platelets in a CD36-dependent manner. We now show that mitogen-activated protein kinase c-Jun N-terminal kinase (JNK)2 and its upstream activator MKK4...

Platelet activation and platelet- monocyte aggregate formation induced by the atherosclerotic plaque lipid lysophosphatidic acid

Receptor-independent Catabolism of Low Density Lipoprotein

In this study we examine the effects of intravenous ethyl oleate emulsions on the metabolism of native and cyclohexanedione-modified human low density lipoprotein in rabbits. Treatment produced a highly significant faU in receptor-independent catabolism as measured by the fractional clearance rate of cyclohexanedione-modified low density lipoprotein. Receptor-dependent Catabolism (the differenc...

Induction of T-cell activation by oxidized low density lipoprotein.

Oxidation and scavenger receptor-mediated uptake of low density lipoprotein (LDL) in intimal macrophages are believed to be key events in the development of atherosclerosis. We report here that oxidized LDL increases DNA synthesis, expression of HLA-DR, and interleukin-2 receptors in T cells. The stimulatory effect of oxidized LDL was not due to a direct effect on T cells but required the prese...