Analysis of placental tissue in Fabry disease with and without enzyme replacement therapy.

There are only a few reports on the histology of placental tissue of pregnancies from mothers with Fabry disease. Fabry disease is a lysosomal disorder caused by alpha-galactosidase A deficiency. Extensive glycosphingolipid (GSL) accumulation in fetal and maternal placenta tissue obtained from a Fabry mother and her affected male newborn has previously been reported. Here we report the evaluation of placenta tissue of two pregnancies in Fabry mothers, one of an unaffected male newborn (placenta A) and one of an affected female newborn (placenta B). The mother of the female affected offspring was treated with recombinant alpha-galactosidase A (enzyme replacement therapy, ERT) during the pregnancy (placenta B). Storage material was only detected in smooth muscle cells of the umbilical cord of placenta B. No accumulation was seen in both placentae. Combing these results with the outcome in two earlier described placentae, a heterogeneous picture emerges. This may be due to differences in disease severity in the mothers or severity of disease in their offspring. In addition, a possible effect of ERT on placental GSL accumulation could also explain lack of GSL storage in placenta B.