The present invention relates to methods for treating and preventing graft-versus-host disease (GVHD) and radiation-induced tissue damage or organ failure. More particularly, methods of the present invention comprise administering a therapeutically effective amount of mesenchymal stem cell-educated macrophages (MEMs) to a subject to treat or prevent GVHD, bone marrow failure, radiation-induced tissue damage or organ failure, or a condition associated with aberrant inflammation.
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