[Lipid composition of the placenta of rats with protein restriction and deficiency of essential fatty acids].
The influence of diet restriction and EFA deficiency during pregnancy in the rat on the lipid and phospholipids composition of the placenta was investigated. Female virgin albino Wistar rats weighing 130 +/- 4 g, were assigned to three equivalent groups. Prior mating and during pregnancy each group of rats received the following regimen: Animals in the Control Group (C) were fed a 25% casein diet in ad libitum quantities; the dietary Restricted Group (D) received the same control diet in amounts calculated to approximate 50% (g/100 g rat) of the intake of group C; the Deficient and Restricted Group (DD) rats were fed a restricted amount of EFA deficient diet. On the 21st day of gestation pregnant animals were sacrificed. The foetuses and placentae obtained by caesarium section were isolated and weighed. A 50% food restriction before and during pregnancy resulted in a significant decrease in phospholipid contents (p less than 0.05); severe EFA deficiency superimposed to 50% food restriction, moreover induced significant changes in the fatty acid pattern of phospholipids, decreasing n3 and n6 fatty acids and increasing eicosatrienoic acid. There was an accumulation of triglycerides in the placenta of rats fed on the EFA deficient diet. In the two restricted groups fetal weight was reduced, but although in the DD group, placental weight was not affected, litter size was dramatically reduced.