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Purification and partial characterization of a human hematopoietic
precursor population
C Smith, C Gasparetto, N Collins, A Gillio, MO Muench, RJ O'Reilly and MA Moore
Bone Marrow Transplant Service, Memorial Sloan Kettering Cancer Center, New
York, NY 10021.
This study reports the development of an assay, the Pre-colony-forming unit
(CFU) assay, which detects human hematopoietic precursors. The Pre- CFU
assay is based on the observation that precursors to CFU-
granulocyte-macrophage (CFU-GM) that are undetectable in clonogenic assays
differentiate into CFU-GM preferentially following treatment in suspension
culture with recombinant human interleukin-1 alpha (rhIL-1 alpha) combined
with rhIL-3. Using the Pre-CFU assay, hematopoietic precursors were
detected in human bone marrow depleted of CFU-GM progenitors and
differentiated hematopoietic elements via 4- hydroperoxycyclophosphamide
treatment coupled with selection for CD34+ cells (4-HCresistant/CD34+
marrow). Additionally, the Pre-CFU assay detected recovery of hematopoiesis
substantially earlier than the CFU- GM assay in primates following
myeloablation with 5-fluorouracil. The Pre-CFU assay was used to asses
purification of a phenotypically defined hematopoietic precursor
population, the lin-CD34+ population. The lin-CD34+ population lacks
detectable surface markers for T-cell, B- cell, natural killer cell, and
myeloid lineage, possesses the CD34 antigen, is devoid of CFU-GM
progenitors, and yields Pre-CFU assay values comparable with
4-HCresistant/CD34+ marrow. Using a combination of phenotypic analysis and
Pre-CFU assay analysis, the action of rhIL-1 alpha plus rhIL-3 treatment on
lin-CD34+ cells was further characterized. The data indicate that rhIL-1
alpha plus rhIL-3 treatment induces proliferation and differentiation of
early hematopoietic precursors into progenitors and terminally
differentiated cells, without inducing a significant expansion of the
precursor population itself.
Volume 77,
Issue 10,
pp. 2122-2128,
05/15/1991
Copyright © 1991 by The American Society of Hematology

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