TY - JOUR
AU - Kirn, André
AB - Abstract Circulating CD34+ progenitors were separated from normal human peripheral blood on the basis of size and density by counterflow centrifugal elutriation (CCE). The CD34+ cells, 0.15% of peripheral blood mononuclear cells, were heterogeneous with respect to their elutriation characteristics, mainly size and density. The least mature CD34+ cells, characterized by lack of CD38 antigen, were predominantly found in the small lymphoid cell fraction. In fractions containing larger and denser cells (large lymphocytes, monocytes, and granulocytes), CD38 was increasingly expressed on the CD34+ cells, as were lineage commitment markers CD10 (B lymphoid), CD33 (myeloid), CD13 (myelomonocytic) and CD71 (erythroid) antigens. The smaller and less dense CD34+ cells expressed CD34 antigen brightly while the larger and denser CD34+ cells expressed it dimly. The smaller and less dense CD34+high cells failed to establish colony growth in short-term culture while the larger and denser CD34+low cells gave rise to high counts of colony forming units-granulocyte macrophage (CFU-GM). Physical separation on the basis of size and density by CCE differentiates between two main classes of steadystate CD34+ cells from normal human peripheral blood. The smaller and less dense CD34+high cells correspond to the earliest progenitors that express differentiation markers poorly but CD34 antigen brightly, do not give rise to short-term colony growth in vitro, and thus represent indirect evidence for pluripotent hematopoietic stem cells (PHSC). The larger and denser CD34+low cells are the more mature progenitor cells, already committed to myeloid, lymphoid or erythroid differentiation but only dimly expressing CD34 antigen, and these cells were responsible for short-term colony growth in vitro. 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Google Scholar Crossref Search ADS PubMed WorldCat This content is only available as a PDF. © 1994 AlphaMed Press This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model (https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model)
TI - Isolation and identification of two CD34+ cell subpopulations from normal human peripheral blood
JO - Stem Cells
DO - 10.1002/stem.5530120207
DA - 1994-01-01
UR - https://www.deepdyve.com/lp/oxford-university-press/isolation-and-identification-of-two-cd34-cell-subpopulations-from-djSvOYgU8y
SP - 187
EP - 197
VL - 12
IS - 2
DP - DeepDyve
ER -