Patterns of CD16 and CD56 expression in persistent expansions of CD3+NKa+ lymphocytes are predictive for clonal T-cell receptor gene rearrangements. The Yorkshire Leukaemia Group.
Phenotypic characteristics, and correlations between the expression of membrane NK-associated (NKa) determinants (CD11b, CD16, CD56 and CD57) and T cell receptor (TCR) genotypic patterns, were examined in 25 patients with persistent (greater than 6 months) expansions of CD3+WT31+NKa+ (CD8+ and CD8dim+) lymphocytes. These studies showed that distinct NKa phenotypic profiles were restricted to cases with rearranged TCR configurations and that clonal CD3+NKa+ components could be predicted in most cases by assessing relationships between membrane CD16 and CD56 expression. For all normal NKa subpopulations, there was a high correlation (P less than 0.0001; n = 31) between the expression of these two membrane determinants. Markedly increased CD16 expression by CD3+NKa+ cells, in relation to CD56 (i.e. a high CD16:CD56 ratio), was found exclusively in cases with rearranged TCR (13/16 cases); 2/3 of the remaining cases showing significantly reduced CD16:CD56 ratios and high (greater than 2.0) CD3+CD56+ absolute numbers. In contrast, 7/9 of the germline TCR cases had a normal CD16:CD56 ratio and 2/9 a decreased ratio with low (less than 1.0) CD3+CD56+ absolute numbers. A high ratio of CD16:CD56 expression by CD3+NKa+ lymphocytes was therefore informative for 82% of TCR rearrangements in this series; and analysis of CD16 and CD56 expression was predictive for germline and rearranged TCR configurations in 24/25 persistent CD3+NKa+ expansions.
Sivakumaran
M
M
Leukaemia Diagnostic Unit, Cookridge Hospital, Leeds.
Richards
S J
SJ
Hunt
K M
KM
Steed
A J
AJ
Bynoe
A G
AG
Morgan
M M
MM
Pyrah
R
R
Roberts
B E
BE
Scott
C S
CS
D000328:Adult; D015703:Antigens, CD / Q000276:immunology; D000943:Antigens, Differentiation / Q000032:analysis / Q000276:immunology*; D000945:Antigens, Differentiation, T-Lymphocyte / Q000032:analysis / Q000276:immunology*; D017252:CD3 Complex; D019002:CD56 Antigen; D002999:Clone Cells; D015329:Gene Rearrangement, T-Lymphocyte / Q000276:immunology*; D006801:Humans; D016130:Immunophenotyping / Q000379:methods; D007694:Killer Cells, Natural / Q000276:immunology*; D008875:Middle Aged; D011948:Receptors, Antigen, T-Cell / Q000235:genetics / Q000276:immunology*; D011961:Receptors, Fc / Q000032:analysis / Q000276:immunology*; D017452:Receptors, IgG; D013601:T-Lymphocytes / Q000276:immunology
D015703:Antigens, CD; D000943:Antigens, Differentiation; D000945:Antigens, Differentiation, T-Lymphocyte; D017252:CD3 Complex; D019002:CD56 Antigen; D011948:Receptors, Antigen, T-Cell; D011961:Receptors, Fc; D017452:Receptors, IgG