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Publication : Transgenic major histocompatibility complex class I antigen expressed in mouse trophoblast affects maternal immature B cells.

First Author  Aït-Azzouzene D Year  2001
Journal  Biol Reprod Volume  65
Issue  2 Pages  337-44
PubMed ID  11466198 Mgi Jnum  J:70681
Mgi Id  MGI:2137998 Doi  10.1095/biolreprod65.2.337
Citation  Ait-Azzouzene D, et al. (2001) Transgenic major histocompatibility complex class i antigen expressed in mouse trophoblast affects maternal immature b cells. Biol Reprod 65(2):337-44
abstractText  We have produced transgenic mice using the mouse placental lactogen type II promoter to force and restrict the expression of the mouse major histocompatibility complex (MHC) class I molecule, H-2K(b), to the placenta. We show that the transgenic MHC antigen H-2K(b) is expressed exclusively in trophoblast giant cells from Day 10.5 until the end of gestation. This expression affects neither the fetal development nor the maternal tolerance to the fetus in histoincompatible mothers. We have used the 3.83 B cell receptor (BcR) transgenic mouse line to follow the fate of H-2K(b)-specific maternal B cells in mothers bearing H-2K(b)-positive placentas. Our results suggest that transgenic H-2K(b) molecules on trophoblast giant cells are recognized by 3.83 BcR-transgenic B cells in the bone marrow of pregnant females. This antigen recognition triggers the deletion of a bone marrow B cell subpopulation, including immature and transitional B cells. Their percentage decreases during the second half of gestation and is down to 8% on Day 17.5, compared to 22% in the (3.83 Tg female x Fvb) control group. This deletion might contribute to the process of maternal tolerance of the conceptus.
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