Graft versus host reaction (GVHR) and host versus graft reactivity during pregnancy share at least some cellular pathways. Immunosuppression mediated by placental suppressor factors may actively contribute to the survival of the conceptus in the immunocompetent mother. We have previously reported that supernatants from human choriocarcinoma cell lines inhibit mitogen-activated and antigen-activated proliferation of lymphoid cells. From this perspective, we investigated the capacity of supernatants from human choriocarcinoma cell lines (HCS) to suppress in vivo graft versus host reactions in mice. HCS was tested for its ability to block both local as well as systemic GVHR induced by the injection of parental cells into F1 mice. HCS mediates profound suppression of acute and chronic GVHR. These results confirm that human choriocarcinoma cell lines secrete a potent immunosuppressive factor(s) which can efficiently modulate immune responses in vivo.
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