Abstract
The fatty acid content of rat renal phospholipids was examined during development. An increase in the arachidonic acid content of a particular fraction of phosphatidylcholine (PC2), phosphatidylethanolamine and phosphatidylinositol between 10 and 20 days of age could be observed in the papilla, and these levels were maintained into adulthood, while in the 20:4 content of phosphatidylserine changes were found between 30-day-old rats and adults. In the other fraction of phosphatidylcholine (PC1), saturated fatty acids such as 16:0 and 14:0 decreased, while no changes occurred in the stearic acid (18:0) content. The pattern found for the medulla did not differ significantly from that of the papilla. In contrast, the cortex content of arachidonic acid at 10 days of age was higher than that for papilla and medulla. Levels increased between 10 and 20 days of age, returning to the original values by 30 days with no further variations in the adult. These changes in arachidonic acid content with age in addition to the differences found between the three kidney zones might explain some causes of incomplete renal function in newborns.
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