PMID: 8955500Nov 1, 1996Paper

Evolution of maternofetal transport of immunoglobulins during human pregnancy

American Journal of Reproductive Immunology : AJRI
A MalekH Schneider

Abstract

We determined the evolution of the maternal-fetal transport of immunoglobulins during human pregnancy. Paired blood samples were collected between 17-41 weeks of gestation (WG) by puncture of a peripheral maternal vein and by cordocentesis (17-36 WG, n = 91) or directly at delivery (37-41 WG n = 16) from the umbilical vein. Additional maternal samples were collected from the same individual (n = 16) at 10, 20, 30 WG, and at term. The concentration of IgG and its four subclasses and of IgA were determined in the sera using ELISA method. The mean level of IgG and IgA in maternal sera at 9-16 WG was 13.72 +/- 2.53 g/L and 3.95 +/- 1.23 g/L, respectively. Both, IgG and IgA throughout pregnancy decreased to a level of 60-70% (37-41 WG) of the initial concentration in early pregnancy. The ratio of IgG1:IgG2 in the maternal circulation was 2-3 and remained constant throughout pregnancy (17-41 WG). IgG3 and IgG4 levels remained constant and together were less than 10% of total IgG. In the fetal circulation a continuous rise in the level of both IgG and IgA was observed between 17 and 41 WG. Fetal level of IgG at 17-22 WG was only 5-10% of the maternal level and at term exceeded the maternal level reaching a value of 11.98 +/- 2.18 g/L....Continue Reading

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Citations

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