HIGH RATE OF INTESTINAL ABSORPTION OF THE PHOSPHOLIPID ANALOGUE 1-DODECYL 2-[1-14C] OCTANAMIDO-sn-2-DEOXY-GLYCERO-3-PHOSPHOCHOLINE IN THE RAT

The phospholipid analogue with two short fatty chains, 1-dodecyl-2-[1-14C] octanamido-sn-2-deoxy-gly cero-3-phosphocholine ([14C] phospholipid analogue), with a non-hydrolyzable bond at position 2 of the glycerol, is an inhibitor of phospholipase A2. It was obtained after chemical synthesis and 0.5 μmol was solubilized in Na+taurocholate with an equimolar amount of 1-octadecanoyl 2-[3H]eicosatetraenoyl-sn- glycero-3-phosphocholine which is the current substrate of phospholipases A2. Both molecules were introduced into the duodenum of rats in order to follow their captations by intestinal mucosa cells for 30, 60 or 90 min. The [14C] phospholipid analogue was poorly split by phospholipases A2(pancreatic juice and intracellular enzymes). It disappeared from the intestinal contents (87% of the dose gone in 90 min) as rapidly as the tritiated lecithin (81%) but this was later split by the phospholipases at a higher rate.