title: Increased expression of Fas (APO-1, CD95) on CD34+ haematopoietic progenitor cells after allogeneic bone marrow transplantation.
abstract: Up-regulation of Fas/APO-1 (CD95) on haematopoietic progenitors and Fas-mediated apoptosis have been suggested to occur in a possible pathological mechanism in some bone marrow failure syndromes. We examined the expression of Fas antigen and susceptibility to Fas-mediated suppression of donor-derived haematopoietic cells of allogeneic bone marrow transplantation (BMT) recipients. Cytofluorometric analysis revealed low expression of Fas on CD34+ bone marrow cells from marrow donors or healthy controls. However, significantly higher expression of Fas antigen was observed on CD34+ bone marrow cells of BMT recipients, in whom engraftment of donor bone marrow (BM) cells was confirmed. The addition of an agonistic anti-Fas antibody (Ab) (CH-11) to haematopoietic stem cell culture of BM cells more strongly suppressed colony formation from granulocyte-macrophage colony-forming units (GM-CFU) and erythroid burst-forming units (BFU-E) after BMT. Pretreatment by blocking anti-Fas Ab (ZB4) abrogated the Fas-mediated GM-CFU and BFU-E suppression. Purified marrow CD34+ cells from BMT recipients were also susceptible to the Fas-mediated colony suppression. Thus, donor-derived CD34+ haematopoietic cells increased their expression of Fas antigen and were susceptible to Fas-mediated haematopoietic suppression. These findings provide new insight for understanding the haematological condition after BMT.
authors.affiliation: Second Department of Internal Medicine, Hyogo College of Medicine, Nishinomiya, Hyogo, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Saheki
authors.forename: Y
authors.initials: Y
authors.lastname: Fujimori
authors.forename: Y
authors.initials: Y
authors.lastname: Takemoto
authors.forename: E
authors.initials: E
authors.lastname: Kakishita
mesh_terms: D000328:Adult; D000906:Antibodies / Q000008:administration & dosage; D018952:Antigens, CD34 / Q000276:immunology*; D003114:Colony-Forming Units Assay; D005260:Female; D005434:Flow Cytometry; D018380:Hematopoietic Stem Cell Transplantation; D006412:Hematopoietic Stem Cells / Q000276:immunology*; D006801:Humans; D008297:Male; D009190:Myelodysplastic Syndromes / Q000601:surgery*; D011184:Postoperative Period; D014184:Transplantation, Homologous; D019014:fas Receptor / Q000276:immunology*
chemical_list: D000906:Antibodies; D018952:Antigens, CD34; D019014:fas Receptor