Project description:Acute graft-versus-host disease (GVHD) is the major cause of non-relapse mortality post-allogeneic stem cell transplantation. The majority of patients non-responsive to front line treatment with steroids have an estimated overall 2-year survival rate of only 10%. Treatment options for steroid-refractory acute GVHD are limited. Bromodomain and Extraterminal Domain (BET) inhibitors PLX51107 and PLX2853, deemed safe in human clinical trials in high risk malignancies, significantly downregulate pro-inflammatory Th1 and Th17 responses without impacting T regulatory cells, improving survival in murine models of acute GVHD while retaining beneficial graft-versus-leukemia effects. Modulation of the IL23/STAT3 axis via BET inhibition resulted in a reduction of pathogenic Th1/Th17 cells in the spleen and acute GVHD target organs such as the gastrointestinal tract. Based on our preclinical data presented here, PLX51107 will enter clinical trial for refractory acute GVHD in a Phase 1 safety, biological efficacy trial.
Project description:Acute graft-versus-host disease (GVHD) is the major cause of non-relapse mortality post-allogeneic stem cell transplantation. The majority of patients non-responsive to front line treatment with steroids have an estimated overall 2-year survival rate of only 10%. Treatment options for steroid-refractory acute GVHD are limited. Bromodomain and Extraterminal Domain (BET) inhibitors PLX51107 and PLX2853, deemed safe in human clinical trials in high risk malignancies, significantly downregulate pro-inflammatory Th1 and Th17 responses without impacting T regulatory cells, improving survival in murine models of acute GVHD while retaining beneficial graft-versus-leukemia effects. Modulation of the IL23/STAT3 axis via BET inhibition resulted in a reduction of pathogenic Th1/Th17 cells in the spleen and acute GVHD target organs such as the gastrointestinal tract. Based on our preclinical data presented here, PLX51107 will enter clinical trial for refractory acute GVHD in a Phase 1 safety, biological efficacy trial.
Project description:The aim of this study is to assess the Fecal Microbiota Transplantation (FMT) efficacy in the prevention of allogeneic hematopoietic stem cell transplantation (allo-HSCT) complications and particularly Graft versus Host Disease (GvHD).
The hypothesis of this study is that allogeneic FMT may improve outcomes of these patients.
Project description:Allogeneic hematopoietic stem cell transplantation remains the most efficacious treatment for many hematological malignancies. However, its therapeutic potential is affected by the most prominent side effect graft versus host disease. Despite advances in the treatment of graft versus host disease in recent years, morbidity and mortality remains high, which requires the development of new treatment approaches. We therefore implemented mouse models to assess potential treatment options for graft versus host disease. In in vivo experiments, we had observed a protective effect of LCN2 on graft versus host disease of the gastrointestinal tract. We also observed higher numbers of anti-inflammatory macrophages in the intestinal tissues of these animals. Therefore, we aimed to determine potentially regulated genes in these cells by using an in vitro approach of LCN2-treated macrophages.
Project description:A protein signature that could identify graft-versus-tumor (GVT) activity without graft-versus-host disease (GVHD), would allow for customized treatment plans following hematopoietic cell transplantation (HCT). Using orthogonal three-dimensional intact-protein analysis system (IPAS)
coupled with protein tagging and novel systems biology pipeline, we identified a signature of 49 proteins that are significantly increased in the plasma of HCT patients who received donor lymphocyte injection for tumor relapse and develop GVT without GVHD.
Project description:Lethally irradiated C57Bl/6 Act-mOVA mice receiving allogeneic hematopoietic stem cell transplantation (aHSCT) from C57Bl/6 OT-I animals develop acute graft versus host disease (aGvHD) in a CD8+ T cell-dependent, reproducible manner, and succumb to the disease within 4-7 days. Tracking of UBC-GFP/OT-I graft CD8+ T cells discloses heavy infiltration of the GI tract, liver and lungs at the onset of the disease, and hallmark histologic features of acute gastrointestinal and hepatic GvHD, and aGVHD-associated lymphocytic bronchitis. This dataset describes gene expression patterns of CD45.1/OT-1 CD8+ T cells retrieved from the graft before (aHSCT + Day 0), and from various target organs of the host after (aHSCT + Day 4) grafting them into Act-mOVA recipients.
Project description:Repeated fecal microbiota transplantations attenuate diarrhea and lead to sustained changes in the fecal microbiota in acute, refractory gastrointestinal graft-versus-host-disease
Project description:Patients with acute leukemia who are unable to achieve complete remission prior to allogeneic hematopoietic stem cell transplantation (SCT) have dismal outcomes with relapse rates well in excess of 60%. Haplo-identical SCT (haplo-SCT) may allow enhanced graft-versus-leukemia (GVL) effects by virtue of HLA class I/II donor-host disparities but typically requires intensive immune-suppression with post-transplant cyclophosphamide (PT-Cy) to prevent lethal graft-versus-host disease (GVHD). Here we demonstrate in preclinical models that glucocorticoid administration from day -1 to +5 inhibits alloantigen presentation by professional recipient antigen presenting cells in the gastrointestinal tract and prevents donor T-cell priming and subsequent expansion therein. In contrast, direct glucocorticoid signaling of donor T-cells promotes chemokine and integrin signatures permissive of preferential circulation and migration into the bone marrow, promoting donor T-cell residency.
Project description:The macrolide rapamycin is known for its immunosuppressive properties since it inhibits mTOR (mammalian target of rapamycin), which activity affects differentiation and functions of various innate and adaptive immune cells involved in graft-versus-host disease development. Since rapamycin procures immunosuppressive effects on the immune response, rapamycin is an attractive candidate for graft-versus-host disease prevention after allogeneic bone marrow transplantation We used an MHC class I and II mismatched parent into F1 bone marrow transplantation mouse model to elucidate the mechanisms of rapamycin on T cells in the context of graft-versus-host disease prevention. To define the impact of rapamycin therapy on T cells gene expression profile, we performed mircoarray analysis and compared gene expression profiles of sorted splenic T cells from rapamycin and PBS treated mice
