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1995-03-25
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Document 0816
DOCN M9550816
TI Three-colour flow cytometric immunophenotyping in HIV-patients;
comparison to dual-colour protocols.
DT 9505
AU Lillevang ST; Sprogoe-Jakobsen U; Simonsen B; Kristensen T; Department
of Clinical Immunology, Odense University Hospital,; Denmark.
SO Scand J Immunol. 1995 Feb;41(2):114-20. Unique Identifier : AIDSLINE
MED/95167408
AB Flow cytometric measurement of circulating CD4+ lymphocytes is important
in the evaluation of disease progression in HIV-infected patients.
Development of dyes that can be exited at 488 nm and have emission
maximum in the far red area has made three-colour protocols, together
with fluorescein isothiocyanate (FITC) and R-phycoerythrin (PE),
possible in most clinical flow cytometers. We report here the comparison
of a two-tube, three-colour protocol (including CD45/CD4/ CD3 and
CD8/CD4/CD3) with our conventional dual-colour protocol. No significant
differences were found between percentage of CD3+ lymphocytic cells
determined with three different antibody combinations. When the
CD8/CD4/CD3 combination was used a systematic overestimation of CD3+
CD4+% cells was found. This turned out to be caused by the formation of
'CD8-escapees'. These are clumps of CD8+ cells that fall outside the
lymphocyte gating region, principally because of high side scatter. The
problem can be overcome by rigorous vortexing to loosen aggregates. The
lymphocyte gating principle used in this protocol (gating on a side
scatter/CD45 dot plot) is readily applicable to other antibody
combinations. This was demonstrated by measuring CD5+ B lymphocytes, a
subset receiving increasing attention in the study of HIV-induced immune
deviations. We conclude that our three-colour protocol for CD4+
T-lymphocyte determinations offers significant advantages to the
conventional dual-colour method, and we suggest that when possible
anti-CD45 be added to dual-colour combinations in order to improve
lymphocyte gating.
DE Antigens, CD/*IMMUNOLOGY B-Lymphocytes/IMMUNOLOGY Comparative Study
Flow Cytometry/*METHODS Human HIV Infections/*IMMUNOLOGY
Immunophenotyping/*METHODS T-Lymphocytes/IMMUNOLOGY JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).