More liposomes containing 1-O-palmityl-D-glucuronic acid (PGA), a synthetic glycolipid, bound to macrophages than those containing phosphatidylglycerol did in vitro; however, PGA-liposomes circulated longer in vivo. PGA-liposomes did not aggregate in the presence of serum, but liposomes containing 1-O-palmityl-D-glucose or myristic acid aggregated rapidly, suggesting that both carbohydrate and carboxyl group of PGA are important for ...
