Abstract
A characteristic of active cytomegalovirus (CMV) infection is its suppressive effect on in vitro assays of immune function. The expression of CD11b by the Cd4+ and Cd8+ lymphocytes allows the identification of subsets with distinct regulatory functions of pokeweed mitogen (PWM) induced B cell differentiation. In order to relate that result with our previous observation that CMV carriers have significantly increased numbers of CD4+, HNK1+ and CD8+, HNK1+ lymphocytes in their peripheral blood compared with non-carriers, we performed a three-colour flow cytometric analysis of the co-expression of Cd11b and HNK1 by CD4+ and CD8+ lymphocytes obtained from 27 CMV carriers and 42 non-carriers. The differences between CMV carriers and non-carriers were significant for the CD4+, HNK1+ lymphocytes (median [5th and 95th percentiles], 59 [18 and 123 versus 24/7 and 73 per mm3, respectively; P less than 0.001) and CD8+, HNK1+ lymphocytes (59 [18 259] versus 52 [23 and 139] per mm3; P less than 0.001), but not for the CD4+, CD11b+ lymphocytes (59 [18 and 135] versus 52 [17 and 104] per mm3) and the CD8+, CD11b+ lymphocytes (85 [34 and 293] versus 82 [21 and 248] per mm3). The CD4+, HNK1+ and CD8+, HNK1+ lymphocytes that were increased in CMV carriers compared with non-carriers included mostly CD11b-, but also CD11b+ lymphocytes. After sorting CD4+ and CD8+ lymphocytes for four CMV carriers into HNK1+ and HNK1- fractions, we analyzed their regulatory functions on PWM-driven B cell Helper function to PWM-driven B cell differentiation was exclusively associated with the CD4+, HNK1- lymphocytes; the CD4+, HNK1+ generally did not show helper or suppressor activity in this assay. Both CD8+, HNK1+ and CD8+, HNK1- lymphocytes showed suppressor activity. Thus, the NHK1 marker does not constitute a phenotypical correlate for suppressor cells of PWM-driven B-cell differentiation.
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