title: CD34+ progenitors and colony-forming units-granulocyte macrophage are recruited during large-volume leukapheresis and concentrated by counterflow centrifugal elutriation.
abstract: The recruitment of mononuclear cells (MNCs), colony-forming units-granulocyte macrophage (CFU-GM), lymphocyte subpopulations, and CD34+ progenitor cells was studied during large-volume (15-25 L blood processed) peripheral blood stem cell (PBSC) harvests. Normal donors (n = 13) underwent a 4-hour leukapheresis designed to maximize PBSC yield (blood flow rate, 85 mL/min). Mean (+/- SD) volume processed was 17.7 +/- 0.4 L, and yield was 2.4 +/- 0.7 x 10(10) white cells containing 99 percent MNCs and 1.3 mL red cells per L of blood processed. Postapheresis hematocrit, platelets, and MNCs were reduced from preapheresis values by 7, 35, and 23 percent, respectively (p < 0.05). In nine donors, the component was collected as four 1-hour samples, and culturing of CFU-GM and flow cytometric analysis of lymphocyte subpopulations and CD34+/HLA-DR+ cells were done in individual samples. Total CFU-GM were 2.4 +/- 1.4 x 10(6) (3.0 +/- 1.8 x 10(4) CFU-GM/kg) and lymphocytes were 20.8 x 10(9), with 75 percent CD3+ T cells, 10 percent CD19/CD20+ B cells, and 17 percent natural killer cells. A more than twofold increase in CFU-GM and CD34+ cells was noted over the course of the 4-hour procedure (p < 0.05). In four donors, the leukapheresis component underwent counterflow centrifugal elutriation (CCE), which separated it into four fractions in an attempt to concentrate CD34+ and CFU-GM progenitors and to deplete T-lymphocytes on a large scale. There was a 1.8-, 4.6-, 3.9-, and 0.32-fold increase in CFU-GM in the four fractions relative to the unseparated component.(ABSTRACT TRUNCATED AT 250 WORDS)
authors.affiliation: Department of Pathology, Emory University School of Medicine, Atlanta, Georgia.
authors.forename: C D
authors.initials: CD
authors.lastname: Hillyer
authors.forename: D A
authors.initials: DA
authors.lastname: Lackey
authors.forename: K K
authors.initials: KK
authors.lastname: Hart
authors.forename: L L
authors.initials: LL
authors.lastname: Stempora
authors.forename: R A
authors.initials: RA
authors.lastname: Bray
authors.forename: J G
authors.initials: JG
authors.lastname: Bender
authors.forename: A D
authors.initials: AD
authors.lastname: Donnenberg
mesh_terms: D000328:Adult; D015703:Antigens, CD / Q000032:analysis*; D018952:Antigens, CD34; D002469:Cell Separation; D002498:Centrifugation / Q000379:methods; D006098:Granulocytes / Q000166:cytology; D006412:Hematopoietic Stem Cells / Q000276:immunology*; D006801:Humans; D007700:Kinetics; D007937:Leukapheresis; D007958:Leukocyte Count; D016131:Lymphocyte Subsets / Q000166:cytology; D008264:Macrophages / Q000166:cytology; D008297:Male; D013234:Stem Cells / Q000166:cytology*
chemical_list: D015703:Antigens, CD; D018952:Antigens, CD34