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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 

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Placental transport of bile acids: analysis of bile acids in maternal serum and urine, umbilical cord blood, and amniotic fluid.

To investigate the role of placental transport of bile acids in fetal bile acid metabolism, such as with regard to synthesis of the unusual bile acids (1 beta- and 6 alpha-hydroxylated and unsaturated bile acids), we measured the concentrations of bile acids in umbilical cord blood, amniotic fluid, maternal serum and maternal urine at delivery by means of gas chromatography-mass spectrometry. Serum and urine from healthy nonpregnant women were used as controls. We detected large amounts of unusual bile acids, especially hyocholic acid and 3 beta-hydroxy-delta 5 bile acids, in amniotic fluid and umbilical cord blood. The concentration of total bile acids in maternal serum was less than that of control serum and umbilical cord blood, and the concentration of total bile acids in maternal urine was higher than that of control urine and amniotic fluid. In conclusion, the fetus synthesized large amounts of unusual bile acids, and these compounds were transported from fetus to mother by placental transfer. We suggest that pregnant women may excrete large amounts of bile acids into the urine to control serum concentration of bile acids in fetus.[1]

References

  1. Placental transport of bile acids: analysis of bile acids in maternal serum and urine, umbilical cord blood, and amniotic fluid. Ushijima, K., Kimura, A., Inokuchi, T., Yamato, Y., Maeda, K., Yamashita, Y., Nakashima, E., Kato, H. The Kurume medical journal. (2001) [Pubmed]
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