title: Extracorporeal photopheresis reverses experimental graft-versus-host disease through regulatory T cells.
abstract: Extracorporeal photopheresis (ECP), a technique that exposes isolated white blood cells to photoactivatable 8-methoxypsoralen and ultraviolet A radiation, is used clinically to treat cutaneous T-cell lymphoma and immune-mediated diseases such as graft-versus-host disease (GVHD). ECP is thought to control these diseases in part through direct induction of lymphocyte apoptosis, but its effects on the immune system beyond apoptosis remain poorly characterized. We have developed a novel method for incorporating ECP treatment into well-established and clinically relevant murine models of GVHD to examine its effects during an ongoing immune response. We demonstrate that the transfer of cells treated with ECP reverses established GVHD by increasing donor regulatory T cells and indirectly reducing the number of donor effector lymphocytes that themselves had never been exposed to psoralen and ultraviolet A radiation.
authors.affiliation: Department of Pediatrics, University of Michigan Cancer Center, Ann Arbor, MI, USA. egatza@umich.edu
authors.forename: Erin
authors.initials: E
authors.lastname: Gatza
authors.forename: Clare E
authors.initials: CE
authors.lastname: Rogers
authors.forename: Shawn G
authors.initials: SG
authors.lastname: Clouthier
authors.forename: Kathleen P
authors.initials: KP
authors.lastname: Lowler
authors.forename: Isao
authors.initials: I
authors.lastname: Tawara
authors.forename: Chen
authors.initials: C
authors.lastname: Liu
authors.forename: Pavan
authors.initials: P
authors.lastname: Reddy
authors.forename: James L M
authors.initials: JL
authors.lastname: Ferrara
mesh_terms: D000818:Animals; D016026:Bone Marrow Transplantation / Q000009:adverse effects; D004195:Disease Models, Animal; D005260:Female; D006086:Graft vs Host Disease / Q000628:therapy*; D018655:Lymphocyte Count; D051379:Mice; D017893:Photopheresis; D015996:Survival Rate; D016176:T-Lymphocyte Subsets / Q000187:drug effects / Q000528:radiation effects / Q000637:transplantation; D050378:T-Lymphocytes, Regulatory / Q000637:transplantation*; D014184:Transplantation, Homologous