title: Cell adhesion molecule expression on CD34+ cells in grafts and time to myeloid and platelet recovery after autologous stem cell transplantation.
abstract: The relationship between cell adhesion receptor expression on CD34+ cells in stem cell grafts and the time to neutrophil and platelet recovery after autologous stem cell transplantation (ASCT [n = 25]) was studied with granulocyte/monocyte-colony stimulating factor (GM-CSF)-mobilized peripheral blood stem cells (PBSCs) and steady-state bone marrow (BM) harvests. Cell adhesion receptor expression was analyzed using flow cytometry after CD34+ cell enrichment. Significantly higher expression of L-selectin and CD44, and significantly lower expression of VLA-4, LFA-1, ICAM-1, Sialyl Lewis(x), Sialyl Lewis(A), and Thy-1 were observed on PBSCs compared with BM CD34+ cells. The log of the number of reinfused CD34+ cells, colony forming units granulocyte/macrophage (CFU-GM), and CD34+ cells coexpressing VLA-4, VLA-5, LAF-1, Mac-1, LFA-3, or CD38 but not ICAM-1, Sialyl Lewis(x), Sialyl Lewis(A), or Thy-1 correlated with the time required to reach an absolute neutrophil count (ANC) of > or =0.5 x 10(9)/L. In addition, the log of the number of CD34+ L-selectin+ and CD34+CD44+ cells reinfused after ASCT correlated better with the time required to reach an ANC of > or =0.5 x 10(9)/L than did the log of the number of CD34+ cells or CFU-GM reinfused. The log of the number of reinfused CD34+ cells, CFU-GM, and CD34+ cells coexpressing CD44, L-selectin, VLA-5 Mac-1, or CD38, but not VLA-4, LAF-1, ICAM-1, LAF-3, Sialyl Lewis(X), Sialyl Lewis(A), or Thy-1, correlated with the time required to reach a platelet count of >20 x 10(9)/L. Thus, L-selectin or CD44 may play an important role in the homing of progenitors after ASCT. In addition, the higher proportion of CD34+L-selectin+ or CD34+CD44+ cells in leukapheresis products may provide one explanation for the more rapid hematologic reconstitution observed after PBSC transplantation.
authors.affiliation: Department of Pathology/Microbiology, University of Nebraska Medical Center, Omaha 68198-5660, USA.
authors.forename: T
authors.initials: T
authors.lastname: Watanabe
authors.forename: B
authors.initials: B
authors.lastname: Dave
authors.forename: D G
authors.initials: DG
authors.lastname: Heimann
authors.forename: J D
authors.initials: JD
authors.lastname: Jackson
authors.forename: A
authors.initials: A
authors.lastname: Kessinger
authors.forename: J E
authors.initials: JE
authors.lastname: Talmadge
mesh_terms: D000328:Adult; D018952:Antigens, CD34; D001772:Blood Cell Count; D001792:Blood Platelets / Q000378:metabolism / Q000473:pathology*; D015815:Cell Adhesion Molecules / Q000096:biosynthesis*; D005260:Female; D006085:Graft Survival; D018380:Hematopoietic Stem Cell Transplantation; D006689:Hodgkin Disease / Q000628:therapy*; D006801:Humans; D007962:Leukocytes / Q000378:metabolism / Q000473:pathology*; D008228:Lymphoma, Non-Hodgkin / Q000628:therapy*; D008297:Male; D008875:Middle Aged; D014182:Transplantation, Autologous
chemical_list: D018952:Antigens, CD34; D015815:Cell Adhesion Molecules