title: Serum after autologous transplantation stimulates proliferation and expansion of human hematopoietic progenitor cells.
abstract: Regeneration after hematopoietic stem cell transplantation (HSCT) depends on enormous activation of the stem cell pool. So far, it is hardly understood how these cells are recruited into proliferation and self-renewal. In this study, we have addressed the question if systemically released factors are involved in activation of hematopoietic stem and progenitor cells (HPC) after autologous HSCT. Serum was taken from patients before chemotherapy, during neutropenia and after hematopoietic recovery. Subsequently, it was used as supplement for in vitro culture of CD34(+) cord blood HPC. Serum taken under hematopoietic stress (4 to 11 days after HSCT) significantly enhanced proliferation, maintained primitive immunophenotype (CD34(+), CD133(+), CD45(-)) for more cell divisions and increased colony forming units (CFU) as well as the number of cobblestone area-forming cells (CAFC). The stimulatory effect decays to normal levels after hematopoietic recovery (more than 2 weeks after HSCT). Chemokine profiling revealed a decline of several growth-factors during neutropenia, including platelet-derived growth factors PDGF-AA, PDGF-AB and PDGF-BB, whereas expression of monocyte chemotactic protein-1 (MCP-1) increased. These results demonstrate that systemically released factors play an important role for stimulation of hematopoietic regeneration after autologous HSCT. This feedback mechanism opens new perspectives for in vivo stimulation of the stem cell pool.
authors: Helmholtz-Institute for Biomedical Engineering, RWTH Aachen University Medical School, Aachen, Germany.
authors: Thomas
authors: T
authors: Walenda
authors: Gudrun
authors: G
authors: Bokermann
authors: Edgar
authors: E
authors: Jost
authors: Oliver
authors: O
authors: Galm
authors: Anne
authors: A
authors: Schellenberg
authors: Carmen M
authors: CM
authors: Koch
authors: Daniela M
authors: DM
authors: Piroth
authors: Wolf
authors: W
authors: Drescher
authors: Tim H
authors: TH
authors: Brümmendorf
authors: Wolfgang
authors: W
authors: Wagner
mesh_terms: D018952:Antigens, CD34; D015415:Biomarkers / Q000378:metabolism; D019070:Cell Lineage; D049109:Cell Proliferation; D018925:Chemokines / Q000097:blood; D003114:Colony-Forming Units Assay; D018380:Hematopoietic Stem Cell Transplantation; D006412:Hematopoietic Stem Cells / Q000166:cytology*; D006801:Humans; D016130:Immunophenotyping; D044967:Serum / Q000378:metabolism*; D014182:Transplantation, Autologous; D015854:Up-Regulation
chemical_list: D018952:Antigens, CD34; D015415:Biomarkers; D018925:Chemokines