Abstract
Light microscopic, electron microscopic, and morphometric studies were performed on rat conceptuses cultured between day 10 and day 12 in normal, hyperglycemic, arachidonic acid-supplemented normal, and arachidonic acid-supplemented hyperglycemic rat serum. The results were compared with those of 12-day-old conceptuses grown in utero. No major differences were observed between in vivo and in vitro control conceptuses. Arachidonic acid supplementation of control culture medium resulted in an improvement of conceptus development. Addition of 20 μg/ml of arachidonic acid to an otherwise teratogenic hyperglycemic serum medium (950 mg/dl of D-glucose) prevented the malformations induced by hyperglycemic conditions: open neural tube, advanced neuropil formation in the neuroepithelium, significant reduction of rough endoplasmic reticulum, decreased size and number of lipid droplets, and increased number of lysosome-like structures in the visceral endodermal yolk sac cells.
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