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Blood, 15 December 2007, Vol. 110, No. 13, pp. 4588-4598. Prepublished online as a Blood First Edition Paper on September 7, 2007; DOI 10.1182/blood-2007-08-106005.
TRANSPLANTATION Preemptive HMG-CoA reductase inhibition provides graft-versus-host disease protection by Th-2 polarization while sparing graft-versus-leukemia activity1 Division of Blood and Marrow Transplantation, Department of Medicine, Stanford University School of Medicine, Stanford, CA; 2 Division of Hematology and Oncology, Department of Medicine, Albert Ludwig University Freiburg, Freiburg, Germany; 3 Department of Neurology and Neurological Sciences, Stanford University School of Medicine, Stanford, CA; and 4 Department of Pathology; Stanford University School of Medicine, Stanford, CA We investigated whether atorvastatin (AT) was capable of protecting animals from acute graft-versus-host disease (aGVHD) across major histocompatibility complex (MHC) mismatch barriers. AT treatment of the donor induced a Th-2 cytokine profile in the adoptively transferred T cells and reduced their in vivo expansion, which translated into significantly reduced aGVHD lethality. Host treatment down-regulated costimulatory molecules and MHC class II expression on recipient antigen-presenting cells (APCs) and enhanced the protective statin effect, without impacting graft-versus-leukemia (GVL) activity. The AT effect was partially reversed in STAT6–/– donors and abrogated by L-mevalonate, indicating the relevance of STAT6 signaling and the L-mevalonate pathway for AT-mediated aGVHD protection. AT reduced prenylation levels of GTPases, abolished T-bet expression, and increased c-MAF and GATA-3 protein in vivo. Thus, AT has significant protective impact on aGVHD lethality by Th-2 polarization and inhibition of an uncontrolled Th-1 response while maintaining GVL activity, which is of great clinical relevance given the modest toxicity profile of AT.
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