Microchimerism: tolerance vs. sensitization.

Abstract:

PURPOSE OF REVIEW:The bidirectional exchange of cells, both mature and progenitor types, at the maternal-fetal interface is a common feature of mammalian reproduction. The presence of semiallogeneic cells in a host can have significant immunological effects on transplantation tolerance and rejection. Here, we review recent advances in this area. RECENT FINDINGS:Maternal microchimerism (MMc) in blood and various organs was found to be directly correlated with noninherited maternal antigen (NIMA)-specific CD4(+) regulatory T cells (Tregs), in F(1) backcross mice. In humans, MMc induced NIMA-specific FoxP3(+) CD4 Tregs in lymph nodes and spleen of fetuses. Tolerance to NIMA(+) allografts could be predicted in mice by measuring levels of the NIMA-specific Tregs in offspring before transplantation. On the contrary, fetal microchimerism (FMc) in multiparous female mice was largely confined to CD34(+) hematopoietic stem cells (HSCs) and was associated with sensitization rather than Treg induction. The recent discovery of a 'layered' T-cell development in humans whereby fetal HSCs are more likely to produce Tregs than adult HSCs, which may explain why MMc often induces tolerance, whereas FMc tends to induce sensitization. SUMMARY:Microchimerism may cause tolerance resulting in acceptance of an allograft bearing antigens shared by the microchimeric cells. However, microchimerism may also cause sensitization resulting in rejection. Distinguishing these effects prior to the transplant may revolutionize the field of living-related renal transplantation wherein MMc and FMc can exert a powerful influence on graft outcome.

authors

Dutta P,Burlingham WJ

doi

10.1097/MOT.0b013e3283484b57

subject

Has Abstract

pub_date

2011-08-01 00:00:00

pages

359-65

issue

4

eissn

1087-2418

issn

1531-7013

journal_volume

16

pub_type

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