PMID- 12878353 OWN - NLM STAT- MEDLINE DCOM- 20040312 LR - 20190906 IS - 0198-8859 (Print) IS - 0198-8859 (Linking) VI - 64 IP - 8 DP - 2003 Aug TI - Soluble HLA-G inhibits human dendritic cell-triggered allogeneic T-cell proliferation without altering dendritic differentiation and maturation processes. PG - 752-61 AB - The role of the nonclassical human leukocyte antigen (HLA) class Ib molecule HLA-G in immune tolerance was first reported at maternofetal interface. This immunomodulating role could be exerted more generally in tumoral or post-transplantation situations in inhibiting natural killer (NK) and T-lymphocyte mediated lysis. Among the different transcripts resulting from alternative splicing, the mainly secreted isoform, HLA-G5, corresponds to complete molecule and has been demonstrated to be elevated in melanomas and in serum from heart-transplanted patients. As dendritic cells expressed ILT4, an inhibitory receptor capable of interacting with HLA-G, we have studied the effect of soluble HLA-G (HLA-G5) on differentiation, maturation, apoptosis and function of monocyte or CD34+-derived dendritic cells (DC). Soluble HLA-G did not alter differentiation, maturation or apoptosis of DC whatever their origin. On the other hand, an inhibitory effect of HLA-G5 on T lymphocytes proliferation was found in 53% of mixed leukocyte reactions (MLR) and was variable in intensity. These data demonstrate an indirect way of HLA-G5 action on DC occurring via T lymphocytes that reinforces the immune inhibitory role of soluble HLA-G capable to be secreted during tumoral malignancies or following heart transplantation. FAU - Le Friec, Gaelle AU - Le Friec G AD - Laboratoire Universitaire d'Hematologie et de la Biologie des Cellules Sanguines, UPRES EA 22-33, Faculte de Medecine, Universite de Rennes 1, Rennes, France. FAU - Laupeze, Beatrice AU - Laupeze B FAU - Fardel, Olivier AU - Fardel O FAU - Sebti, Yasmine AU - Sebti Y FAU - Pangault, Celine AU - Pangault C FAU - Guilloux, Valerie AU - Guilloux V FAU - Beauplet, Alain AU - Beauplet A FAU - Fauchet, Renee AU - Fauchet R FAU - Amiot, Laurence AU - Amiot L LA - eng PT - Journal Article PL - United States TA - Hum Immunol JT - Human immunology JID - 8010936 RN - 0 (Antigens, CD34) RN - 0 (HLA Antigens) RN - 0 (HLA-G Antigens) RN - 0 (Histocompatibility Antigens Class I) SB - IM MH - Antigens, CD34/analysis MH - *Apoptosis MH - Blotting, Western MH - *Cell Differentiation MH - Cell Line, Tumor MH - Dendritic Cells/immunology/metabolism/*physiology MH - Enzyme-Linked Immunosorbent Assay MH - HLA Antigens/genetics/*physiology MH - HLA-G Antigens MH - Histocompatibility Antigens Class I/genetics/*physiology MH - Humans MH - Lymphocyte Culture Test, Mixed MH - Monocytes/physiology MH - Phenotype MH - Solubility MH - T-Lymphocytes/*physiology EDAT- 2003/07/25 05:00 MHDA- 2004/03/16 05:00 CRDT- 2003/07/25 05:00 PHST- 2003/07/25 05:00 [pubmed] PHST- 2004/03/16 05:00 [medline] PHST- 2003/07/25 05:00 [entrez] AID - S0198885903000910 [pii] AID - 10.1016/s0198-8859(03)00091-0 [doi] PST - ppublish SO - Hum Immunol. 2003 Aug;64(8):752-61. doi: 10.1016/s0198-8859(03)00091-0.