Abstract 407: High Density Lipoprotein Mediated Protection of Macrophages Against Apoptosis Requires Scavenger Receptor Class B Type 1 Activity and Sphingosine-1-Phosphate

Background/Objectives: Prevention of macrophage apoptosis in advanced atherosclerotic lesions can help stop atherosclerosis progression to vulnerable plaques. High density lipoprotein (HDL) can protect macrophages from apoptosis that has been induced by a variety of agents. We hypothesize that this is the consequence of the sphingolipid, sphingosine-1-phosphate (S1P), specifically carried by HDL, and transferred to S1P receptor 1 (S1PR1) on the …