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Acute myeloid leukemia (AML) initiating and sustaining cells maintain high cell-surface similarity with their cells-of-origin, i.e., hematopoietic stem and progenitor cells (HSPCs), and identification of truly distinguishing leukemia-private antigens has remained elusive to date. To nonetheless utilize surface antigen-directed immunotherapy in AML, we here propose targeting both, healthy and malignant human HSPC, by chimeric antigen receptor (CAR) T-cells with specificity against CD117, the cognate receptor for stem cell factor. This approach should spare most mature hematopoietic cells and would require CAR T termination followed by subsequent transplantation of healthy HSPCs to rescue hematopoiesis. We successfully generated anti-CD117 CAR T-cells from healthy donors and AML patients. Anti-CD117 CAR T-cells efficiently targeted healthy and leukemic CD117-positive cells in vitro. In mice xenografted with healthy human hematopoiesis, they eliminated CD117-expressing, but not CD117-negative human cells. Importantly, in mice xenografted with primary human CD117-positive AML, they eradicated disease in a therapeutic setting. Administration of ATG in combination with rituximab, which binds to the co-expressed CAR T-cell transduction/selection marker RQR8, led to CAR T-cell depletion. Thus, we here provide the first proof of concept for the generation and preclinical efficacy of CAR T-cells directed against CD117-expressing human hematopoietic cells.
Biopsy, T-Lymphocytes, 2720 Hematology, Receptors, Antigen, T-Cell, Gene Expression, 610 Medicine & health, 10263 Institute of Experimental Immunology, Immunotherapy, Adoptive, Lymphocyte Depletion, Immunophenotyping, Mice, Bone Marrow, Cell Line, Tumor, Animals, Humans, 1306 Cancer Research, Receptors, Chimeric Antigen, Hematopoietic Stem Cells, Disease Models, Animal, Leukemia, Myeloid, Acute, Proto-Oncogene Proteins c-kit, Treatment Outcome, Hematologic Neoplasms, 10032 Clinic for Oncology and Hematology, 2730 Oncology, Biomarkers
Biopsy, T-Lymphocytes, 2720 Hematology, Receptors, Antigen, T-Cell, Gene Expression, 610 Medicine & health, 10263 Institute of Experimental Immunology, Immunotherapy, Adoptive, Lymphocyte Depletion, Immunophenotyping, Mice, Bone Marrow, Cell Line, Tumor, Animals, Humans, 1306 Cancer Research, Receptors, Chimeric Antigen, Hematopoietic Stem Cells, Disease Models, Animal, Leukemia, Myeloid, Acute, Proto-Oncogene Proteins c-kit, Treatment Outcome, Hematologic Neoplasms, 10032 Clinic for Oncology and Hematology, 2730 Oncology, Biomarkers
citations This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically). | 72 | |
popularity This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network. | Top 1% | |
influence This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically). | Top 10% | |
impulse This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network. | Top 1% |