1-Palmitoyl-D9-2-hydroxy-sn-glycero-3-PA is compound,an analog of LPA with palmitic acid at the sn-1 position,activates reporter gene expression in PC12 cells fitted with human lysophosphatidic acid receptor 4 (LPA4)at 0.01 to 10 µM concentrations. Additionally,1-palmitoyl LPA prompts aggregation in isolated human platelets within the 12-300 µM range,a process reversible by prostaglandin E1 (PGE1),theophylline,or EDTA. It also interacts with calcium and magnesium to boost the efficacy of ampicillin,piperacillin,and ceftazidime against P. aeruginosa strains from cystic fibrosis patients.