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We have previously demonstrated that short-term coreceptor blockade with non-lytic monoclonal antibodies enables the long-term survival of fully allogeneic embryonic stem cell (ESC) transplants in mice. Here, we describe the use of Hu-PBL humanized mice to determine whether short-term coreceptor blockade with humanized anti-human CD4 and CD8 antibodies can achieve the same outcome towards human ESC derivatives. While control Hu-PBL mice rejected allogeneic hESC-derived transplants within weeks, mice treated with coreceptor blocking antibodies held their grafts for 7 weeks, the duration of the study. Rejection in the control mice was associated with demonstrable infiltrates of human CD45 white blood cells, predominantly of CD8 T-cells, whereas anti-CD4, but not anti-CD8 antibody treated mice showed remarkably reduced lymphocyte infiltration and prolonged allograft survival, indicating that the CD4+ T-cells were crucial to the rejection process. Our results give support to the principle that short-term blockade of T-cell co-receptors can achieve long-term acceptance of regenerative cell transplants in humans.

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Allograft, Humanized antibodies, Humanized mice, Immunogenicity, Pancreatic beta-like cells, Pluripotent stem cell therapy, Animals, CD4-Positive T-Lymphocytes, CD8-Positive T-Lymphocytes, Graft Rejection, Graft Survival, Hematopoietic Stem Cell Transplantation, Humans, Mice, Mice, Inbred C57BL, Pluripotent Stem Cells, Transplantation, Homologous