Development, synthesis, and 68Ga-Labeling of a Lipophilic complexing agent for atherosclerosis PET imaging

Abstract

Cardiovascular disease is the leading cause of mortality and morbidity worldwide. Atherosclerosis accounts for 50% of deaths in western countries. This multifactorial pathology is characterized by the accumulation of lipids and inflammatory cells within the vascular wall, leading to plaque formation. We describe herein the synthesis of a PCTA-based 68Ga3+ chelator coupled to a phospholipid biovector 1,2-distearoyl-sn-glycero-3-phosphoethanolamine (DSPE), which is the main constituent of the phospholipid moiety of High-Density Lipoprotein (HDL) phospholipid moiety. The resulting 68Ga-PCTA-DSPE inserted into HDL particles was compared to 18F-FDG as a PET agent to visualize atherosclerotic plaques. Our agent markedly accumulated within mouse atheromatous aortas and more interestingly in human endarterectomy carotid samples. These results support the potential use of 68Ga-PCTA-DSPE-HDL for atherosclerosis PET imaging.