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Uptake and transplacental transfer of fatty acids is essential for fetal development. Human adipophilin and its murine ortholog adipocyte differentiation-related protein are lipid droplet-associated proteins that are implicated in cellular fatty acid uptake in adipocytes. The nuclear receptor peroxisome proliferator-activated receptor-γ (PPARγ) stimulates lipid uptake by adipocytes and enhances differentiation of placental trophoblasts. We therefore hypothesized that adipophilin is expressed in human trophoblasts and that its expression is regulated by PPARγ. We initially determined that adipophilin is expressed in human villous trophoblasts and that adipophilin expression is enhanced during differentiation of cultured primary term human trophoblasts. We also found that exposure of cultured human trophoblasts to the PPARγ ligand troglitazone resulted in a concentration-dependent increase in adipophilin expression. We observed a similar increase with LG268, a ligand for retinoid X receptor (RXR), the heterodimeric partner of PPARγ. Lastly, we demonstrated that ligand-activated PPARγ and RXR stimulated the transcriptional activity of adipophilin promoter in CV-1 cells and in the placental JEG3 cell line. We conclude that the expression of adipophilin is enhanced during trophoblast differentiation and is up-regulated by ligand-activated PPARγ/RXR. Enhanced adipophilin expression may contribute to fatty acid uptake by the placenta.

the journal of clinical endocrinology and metabolism/journal of clinical endocrinology and metabolism

The Lipid Droplet-Associated Protein Adipophilin Is Expressed in Human Trophoblasts and Is Regulated by Peroxisomal Proliferator-Activated Receptor-γ/Retinoid X Receptor