International Immunology, Vol. 11, No. 5, 803-811,
May 1999
© 1999 Japanese Society for Immunology
IL-10 selectively induces HLA-G expression in human trophoblasts and monocytes
CEA, Service de Recherches en Hémato-immunologie, DSV/DRM, Hôpital Saint-Louis, Centre Hayem,1 avenue Claude Vellefaux, 75010 Paris, France
1 Hôpital des Bluets, 9 rue des Bluets 75011 Paris, France
2 Fondation Jean Dausset, CEPH, 27 rue Juliette-Dodu, 75010 Paris, France
Correspondence to: P. Paul
HLA-G plays an essential role in feto-maternal tolerance by inhibiting lysis by maternal NK cells. The factors that allow tissue-specific activation of HLA-G gene expression in trophoblasts remain to be characterized. We investigated the potential effect of IL-10, a cytokine which is secreted in placenta, on HLA-G gene transcription in trophoblasts. Using Northern blot, RNase protection assay and RT-PCR analysis, we demonstrated that IL-10 enhances steady-state levels of HLA-G transcription in cultured trophoblast cells. We further tested the effect of IL-10 on HLA-G gene transcription and protein expression in peripheral blood monocytes, showing that IL-10 can up-regulate HLA-G cell surface expression in this cell type. This effect of IL-10 is selective, since classical MHC class I products and MHC class II are down-regulated in monocytes following IL-10 treatment. Induction of HLA-G expression by IL-10 on monocytes may thus play a role in down-regulation of the immune response. We propose that IL-10 secretion by trophoblasts during pregnancy may also influence the HLA class I expression pattern at the feto-maternal barrier, thus protecting the fetus from rejection. This should be taken into consideration in the design of treatment for pathologies of pregnancy.
Keywords: HLA-G modulation, IL-10, monocytes, trophoblasts
Transmitting editor: J. F. Bach
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