Document Detail

Hemopoietic stem and precursor cell analysis in umbilical cord blood using the Sysmex SE-9000 IMI channel.
MedLine Citation:
PMID:  11309821     Owner:  NLM     Status:  MEDLINE    
Circulating hematopoietic progenitor cells (HPCs) are routinely measured by flow cytometry using CD34 expression. As an alternative, the "immature information" (IMI) channel measurement of the automated hematology analyzer Sysmex SE machines was developed. We tested the IMI channel HPC method with umbilical cord blood specimens. The IMI-HPCs were compared with CD34 counts and numbers of colony-forming units (CFUs). The IMI-HPC data were reproducible and dilution experiments yielded a log-linear relationship. The mean percentage of CD34(+) cells in 50 umbilical cords was 0.43 versus 0.11 of HPCs in the IMI channel (correlation coefficient r = 0.67). Absolute numbers yielded 96.79 x 10(6)/L CD34(+), 33.17 x 10(6)/L IMI-HPC, and 35.04 x 10(6)/L CFU-HPC. Receiver operating characteristics curves were made at various cutoff levels for CD34(+) cells to visualize sensitivity and specificity profiles. With median values of 13.56 x 10(6)/L for IMI-HPC and 20 x 10(6)/L for CD34(+) as cutoff points (the levels used in the laboratory to start stem cell pheresis), the percentage of false-negative observations was 70.4%. To exclude the influence of storage time, tests were repeated until 72 h after umbilical cord collection. Total white blood cell count decreased in most cases, whereas absolute number of IMI-HPC tended to increase in time. In conclusion, if HPC measurements in the IMI channel are used to monitor circulating stem cells during mobilization, one has to be aware of a very low correlation between these results and those of other methods such as CD34(+) analysis and colony growth. False-negative results do occur, but if events are seen in the IMI channel, this simple monitoring technique is useful to predict the presence of circulating stem cells.
R Kraai; A G Reymer; G G Brouwer-Mandema; J M van Beckhoven; M Hoogeboom; S le Cessie; J C Kluin-Nelemans
Publication Detail:
Type:  Comparative Study; Evaluation Studies; Journal Article    
Journal Detail:
Title:  Cytometry     Volume:  46     ISSN:  0196-4763     ISO Abbreviation:  Cytometry     Publication Date:  2001 Apr 
Date Detail:
Created Date:  2001-04-19     Completed Date:  2001-06-28     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8102328     Medline TA:  Cytometry     Country:  United States    
Other Details:
Languages:  eng     Pagination:  114-8     Citation Subset:  IM    
Department of Hematology, Central Clinical Hematology Laboratory, Leiden University Medical Center, Leiden, The Netherlands.
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MeSH Terms
Antigens, CD34 / analysis
Cell Separation / instrumentation*
Colony-Forming Units Assay
Fetal Blood / cytology*
Flow Cytometry
Hematology / instrumentation*
Hematopoietic Stem Cells / cytology*
Infant, Newborn
ROC Curve
Reproducibility of Results
Time Factors
Reg. No./Substance:
0/Antigens, CD34

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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