Insulin and fatty acids regulate the expression of the fat droplet-associated protein adipophilin in primary human trophoblasts

This study was undertaken to test the hypothesis that insulin and fatty acids regulate adipophilin expression in cultured human trophoblasts. Cytotrophoblasts isolated from term human placentas were cultured in the absence or presence of insulin (10 nmol/L), and a mix of oleic and linoleic acid in s...

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Bibliographic Details
Published in:American journal of obstetrics and gynecology 2005-11, Vol.193 (5), p.1716-1723
Main Authors: Elchalal, Uriel, Schaiff, W. Timothy, Smith, Steven D., Rimon, Eli, Bildirici, Ibrahim, Nelson, D. Michael, Sadovsky, Yoel
Format: Article
Language:English
Subjects:
Adipophilin
Biological and medical sciences
Cells, Cultured
Fatty acids
Fatty Acids - metabolism
Fatty Acids - physiology
Female
Gynecology. Andrology. Obstetrics
Humans
Insulin
Insulin - physiology
Medical sciences
Membrane Proteins
Peptides - analysis
Peptides - genetics
Peptides - metabolism
Perilipin-2
Placenta
RNA, Messenger - analysis
Trophoblast
Trophoblasts - physiology
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Summary:This study was undertaken to test the hypothesis that insulin and fatty acids regulate adipophilin expression in cultured human trophoblasts. Cytotrophoblasts isolated from term human placentas were cultured in the absence or presence of insulin (10 nmol/L), and a mix of oleic and linoleic acid in serum-free medium. The expression of adipophilin as well as the fatty acid transport proteins (FATP) 2, 3, 4 and 6 was examined. Fat accumulation was quantified by BODIPY staining and fat uptake determined using [ 3H]-oleic acid. A combination of insulin and fatty acids enhanced the expression of adipophilin (2.3-fold, P < .05). In contrast, the expression of FATPs was unchanged. Furthermore, insulin and fatty acids increased the accumulation of fat droplets in trophoblasts by 4- to 5-fold ( P < .05), but had no effect on oleic acid uptake. Insulin and fatty acids enhance the expression of adipophilin and the formation of fatty acid droplets in term human trophoblasts.
ISSN:0002-9378
1097-6868
DOI:10.1016/j.ajog.2005.04.012