Project description:Hematopoietic stem cell transplantation (HSCT) is successfully applied since the late 1950s, however, its efficacy still needs to be improved. A promising strategy is to transplant high numbers of pluripotent hematopoietic stem cells (HSCs). Therefore, an advanced ex vivo culture system is needed that supports the proliferation and maintains the pluripotency of HSC to override possible limitations in cell numbers gained from donors. To model the natural HSC niche in vitro and thus, to amplify high numbers of undifferentiated HSCs, we used an optimized HSC cell culture medium in combination with artificial 3D bone marrow-like scaffolds made of polydimethylsiloxane (PDMS). After 14 days in vitro (DIV) cell culture, we performed transcriptome and proteome analysis of the whole cell populations. Ingenuity pathway analysis (IPA) indicated that our 3D PDMS cell culture scaffolds activated interleukin, SREBP, mTOR and FOXO signaling pathways as well as the HSC metabolism, which we confirmed by ELISA, Western blot and metabolic flux analysis. These molecular signaling pathways and HSC metabolism are well known to promote the expansion HSCs and are involved in their pluripotency maintenance. After selection and enrichment of immature CD34-positive/CD38-negative HSCs using FACS sorting, we could confirm our findings by another proteome analysis followed by IPA. Thus, we could show that our 3D bone marrow-like PDMS scaffolds activate key molecular signaling pathways to amplify the numbers of undifferentiated HSC efficiently ex vivo.
Project description:The objective of this study is to evaluate the efficacy of using a reduced-intensity condition (RIC) regimen with umbilical cord blood transplant (UCBT), double cord UCBT, matched unrelated donor (MUD) bone marrow transplant (BMT) or peripheral blood stem cell transplant (PBSCT) in patients with non-malignant disorders that are amenable to treatment with hematopoietic stem cell transplant (HSCT). After transplant, subjects will be followed for late effects and for ongoing graft success.
Project description:Single cell transcriptomic profiling (sc RNA-seq) of the two Human Hematopoietic Stem Cell Populations from cord blood: 18LinnegCD34posCD133pos (hereafter CBC1:CD34pos ) and 18LinnegCD34negCD133pos HSCs (hereafter CBC3:CD34neg). Purpose: to compare the single cells transcriptomic profiles of the two Human Hematopoietic Stem Cell Populations: CD34pos HSCs and CD34neg HSCs in order to find unique homing molecules profile. Results provide insight of highly expressed adhesion molecules in CD34neg HSCs and their crucial role in interacting with the bone marrow microenvironment.
Project description:This clinical trial studies personalized dose monitoring of busulfan and combination chemotherapy in treating patients with Hodgkin or non-Hodgkin lymphoma undergoing stem cell transplant. Giving chemotherapy before a stem cell transplant stops the growth of cancer cells by stopping them from dividing or killing them. After treatment, stem cells are collected from the patient’s peripheral blood or bone marrow and stored. The stem cells are then returned to the patient to replace the blood-forming cells that were destroyed by the chemotherapy. Monitoring the dose of busulfan may help doctors deliver the most accurate dose and reduce toxicity in patients undergoing stem cell transplant.
Project description:This is a mathematical model describing the hematopoietic lineages with leukemia lineages, as controlled by end-product negative feedback inhibition. Variables include hematopoietic stem cells, progenitor cells, terminally differentiated HSCs, leukemia stem cells, and terminally differentiated leukemia stem cells.
Project description:Cannonical hematopoietic stem cell (HSC) population is phenotypically defined as Lin- CD34+ CD38- CD45RA- CD90+ in human adult bone marrow. We recently identified novel HSC subpopulation defined as CD35+ HSCs. We performed microarray analysi to clarify the characteristics of CD35+ HSCs in comparison with other stem/progenitor populations. As compared to CD35- HSCs and progenitor populations, CD35+ HSCs showed lower expression of cell-cycle- or lineage-affiliated genes.suggesting their dormant or immature state.
Project description:This clinical trial studies fludarabine phosphate, low-dose total-body irradiation, and donor stem cell transplant followed by cyclosporine, mycophenolate mofetil, and donor lymphocyte infusion in treating patients with hematopoietic cancer. Giving low doses of chemotherapy, such as fludarabine phosphate, and total body irradiation (TBI) before a donor peripheral blood stem cell transplant helps stop the growth of cancer cells. It may also keep the patient’s immune response from rejecting the donor’s stem cells. The donated stem cells may replace the patient’s immune cells and help destroy any remaining cancer cells (graft-versus-tumor effect). Giving an infusion of the donor’s T cells (donor lymphocyte infusion) after the transplant may help increase this effect. Sometimes the transplanted cells from a donor can also make an immune response against the body’s normal cells. Giving cyclosporine and mycophenolate mofetil after the transplant may stop this from happening.
Project description:This study will determine the safety and applicability of experimental forms of umbilical cord blood (UCB) transplantation for patients with high risk hematologic malignancies who might benefit from a hematopoietic stem cell transplant (HSCT) but who do not have a standard donor option (no available HLA-matched related donor (MRD), HLA-matched unrelated donor (MUD)), or single UCB unit with adequate cell number and HLA-match).