Different functional outcomes of intercellular membrane transfers to monocytes and T cells.
Trogocytosis is the uptake of membranes from one cell by another. Trogocytosis has been demonstrated for monocytes, B cells, T cells, and NK cells. The acquisition of the tolerogenic molecule HLA-G by T cells and NK cells makes them behave as regulatory cells. We investigated here whether HLA-G, which is expressed by tumor cells in vivo, could be acquired by monocytes and if this transfer could have functional consequences. We demonstrate that resting, and even more so, activated monocytes efficiently acquire membrane-bound HLA-G from HLA-G tumor cells by trogocytosis. However, we demonstrate that HLA-G quickly disappears from the surface of the monocytes in contrast to the HLA-G acquired by T cells. Consequently, HLA-G(acq+) monocytes do not reliably inhibit the on-going proliferation of autologous activated T cells and do not inhibit their cytokine production. Thus, we show that the acquirer cell may control the functional outcome of trogocytosis.
CEA, I2BM, Service de Recherches en Hemato-Immunologie, 75475 Paris, France.
Kiave-Yune
KY
HoWangYin
Estibaliz
E
Alegre
Marina
M
Daouya
Benoit
B
Favier
Edgardo D
ED
Carosella
Joel
J
LeMaoult
D001402:B-Lymphocytes / Q000276:immunology / Q000378:metabolism / Q000502:physiology; D001692:Biological Transport; D045744:Cell Line, Tumor; D002462:Cell Membrane / Q000378:metabolism*; D049109:Cell Proliferation; D005434:Flow Cytometry; D049452:Green Fluorescent Proteins / Q000378:metabolism; D006680:HLA Antigens / Q000378:metabolism*; D059951:HLA-G Antigens; D015395:Histocompatibility Antigens Class I / Q000378:metabolism*; D006801:Humans; D007694:Killer Cells, Natural / Q000276:immunology / Q000378:metabolism; D008213:Lymphocyte Activation; D009000:Monocytes / Q000276:immunology* / Q000378:metabolism; D021381:Protein Transport; D013601:T-Lymphocytes / Q000276:immunology* / Q000378:metabolism
D006680:HLA Antigens; D059951:HLA-G Antigens; D015395:Histocompatibility Antigens Class I; C485184:enhanced green fluorescent protein; D049452:Green Fluorescent Proteins