title: Immunologic consequences of multiple, high-dose administration of allogeneic mesenchymal stem cells to baboons.
abstract: Mesenchymal stem cells (MSCs) express low immunogenicity and demonstrate immunomodulatory properties in vitro that may safely allow their transplantation into unrelated immunocompetent recipients without the use of pharmacologic immunosuppression. To test this hypothesis, three groups of baboons (three animals per group) were injected as follows: group 1 animals were injected with vehicle; group 2 animals were injected IV with DiI-labeled MSCs (5 x 106 MSCs/kg body weight) followed 6 weeks later by IM injections of DiO-labeled MSCs (5 x 10(6) MSCs/kg) from the same donor; and group 3 animals were treated similarly as group 2 except that MSCs were derived from two different donors. Muscle biopsies, performed 4 weeks after the second injection of MSCs, showed persistence of DiO-labeled MSCs in 50% of the recipients. Blood was drawn at intervals for evaluation of basic immune parameters (Con A mitogen responsiveness, PBMC phenotyping, immunoglobulin levels), and to determine T-cell and alloantibody responses to donor alloantigens. Host T-cell responses to donor alloantigens were decreased in the majority of recipients without suppressing the overall T-cell response to Con A, or affecting basic parameters of the immune system. All recipient baboons produced alloantibodies that reacted with donor PBMCs. Two of six animals produced alloantibodies that reacted with MSCs. We conclude that multiple administrations of high doses of allogeneic MSCs affected alloreactive immune responses without compromising the overall immune system of recipient baboons. The induction of host T-cell hyporesponsiveness to donor alloantigens may facilitate MSC survival.
authors.affiliation: Osiris Therapeutics, Inc., Baltimore, MD, USA.
authors.forename: Kirstin J
authors.initials: KJ
authors.lastname: Beggs
authors.forename: Alex
authors.initials: A
authors.lastname: Lyubimov
authors.forename: Jade N
authors.initials: JN
authors.lastname: Borneman
authors.forename: Amelia
authors.initials: A
authors.lastname: Bartholomew
authors.forename: Annemarie
authors.initials: A
authors.lastname: Moseley
authors.forename: Robert
authors.initials: R
authors.lastname: Dodds
authors.forename: Michael P
authors.initials: MP
authors.lastname: Archambault
authors.forename: Alan K
authors.initials: AK
authors.lastname: Smith
authors.forename: Kevin R
authors.initials: KR
authors.lastname: McIntosh
mesh_terms: D000818:Animals; D005260:Female; D007519:Isoantigens / Q000276:immunology; D008297:Male; D045164:Mesenchymal Stem Cell Transplantation / Q000379:methods*; D059630:Mesenchymal Stem Cells / Q000166:cytology / Q000276:immunology*; D010215:Papio; D013601:T-Lymphocytes / Q000276:immunology; D013997:Time Factors; D023001:Transplantation Tolerance / Q000276:immunology; D014184:Transplantation, Homologous
chemical_list: D007519:Isoantigens