期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 113, 期 52, 页码 15072-15077出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1617927114
关键词
human; HLA-C; trophoblast; pregnancy; immune tolerance
资金
- National Institutes of Health [AI053330]
- March of Dimes [6-FY14-453]
- Portuguese Foundation for Science and Technology [SFRH/BD/33885/2009]
- Fundação para a Ciência e a Tecnologia [SFRH/BD/33885/2009] Funding Source: FCT
The combination of the activating killer cell Ig-like receptor 2DS1 (KIR2DS1) expressed bymaternal decidual natural killer cells (dNK) and the presence of its ligand, the HLA-C allotype HLA-C2, expressed by fetal trophoblasts, reduces the risk of developing pregnancy complications. However, no molecular or cellular mechanism explains this genetic correlation. Herewe demonstrate that KIR2DS1+ dNK acquired higher cytotoxic function than KIR2DS1-dNK when exposed to human cytomegalovirus (HCMV)-infected decidual stromal cells (DSC), particularly when DSCs express HLA-C2. Furthermore, dNK were unable to degranulate or secrete cytokines in response to HCMV-infected primary fetal extravillous trophoblasts. This emphasizes the immunological challenge to clear placental viral infections within the immune-privileged placenta. Activation of dNK through KIR2DS1/HLA-C2 interaction increases their ability to respond to placental HCMV infection and may limit subsequent virus-induced placental pathology. This mechanism is directly related to how KIR2DS1 expressed by dNK reduces development of severe pregnancy complications such as miscarriages and preterm delivery.
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