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Human CD8+ memory- and effector-type T cells are poorly defined. We show here that, next to a naive compartment, two discrete primed subpopulations can be found within the circulating human CD8+ T cell subset. First, CD45RA-CD45R0(+) cells are reminiscent of memory-type T cells in that they express elevated levels of CD95 (Fas) and the integrin family(More)
The alphaEbeta7 integrin CD103 may direct lymphocytes to its ligand E-cadherin. CD103 is expressed on T cells in lung and gut and on allograft-infiltrating T cells. Moreover, recent studies have documented expression of CD103 on CD4+ regulatory T cells. Approximately 4% of circulating CD8+ T cells bear the CD103 molecule. In this study, we show that the(More)
On the basis of expression of the T cell differentiation antigen CD27, human peripheral blood CD4+ memory cells can be divided into two subsets, a large CD45RA-CD27+ (82%) and a small CD45RA-CD27- (18%) population. Analysis of the functional properties of these memory T cell subsets showed that proliferative responses to the recall antigen tetanus toxoid(More)
In humans, loss of CD27 expression is associated with the stable acquisition of effector functions by CD8+ T cells. We found that murine (CD8+)CD27- T cells were confined to the primed CD62L(dull/-)CD44(bright)CCR7- T cell population. (CD8+)CD27- T cells were absent from lymph nodes but could be found in blood, spleen and in non-lymphoid organs such as lung(More)
Activation of unprimed CD4+CD45RA+/RO- T cells results in a gradual loss of CD45RA expression concomitant with the acquisition of CD45RO. It has been suggested that this conversion occurs in vivo through a CD45RAbright/RObright stage. Next to this small CD45RAbright/RObright subset (Dbright), a larger subpopulation that expresses both RA and RO isoforms at(More)
To study the receptors involved in the interaction between extracellular matrix proteins and hematopoietic progenitor cells, we analyzed the expression of beta 1 integrins on CD34+ bone marrow cells by means of immunoflowcytometry. Alpha 4 beta 1 and alpha 5 beta 1 were expressed, whereas alpha 1 beta 1, alpha 2 beta 1, alpha 3 beta 1, alpha 6 beta 1, and(More)
Deficiency of glucocerebrosidase (GBA) underlies Gaucher disease, a common lysosomal storage disorder. Carriership for Gaucher disease has recently been identified as major risk for parkinsonism. Presently, no method exists to visualize active GBA molecules in situ. We here report the design, synthesis and application of two fluorescent activity-based(More)
Switch from non-syncytium-inducing (NSI) to syncytium-inducing (SI) HIV type 1 (HIV-1) is associated with accelerated CD4(+) T cell depletion, which might partially be explained by higher virulence of SI variants compared with NSI variants. Because NSI and SI variants use different coreceptors for entry of target cells, altered tropism might offer an(More)
CD27, a member of the TNFR family, is expressed on most but not all peripheral blood CD4+ T cells. The small fraction of CD4+ T cells with a CD27- phenotype exclusively reside within the CD45RA-CD45RO+ subset. We previously provided evidence that CD27- cells are functionally differentiated cells that have lost CD27 expression as a result of persistent(More)
Recent studies in mice have shown that although interleukin 15 (IL-15) plays an important role in regulating homeostasis of memory CD8+ T cells, it has no apparent function in controlling homeostatic proliferation of naive T cells. We here assessed the influence of IL-15 on antigen-independent expansion and differentiation of human CD8+ T cells. Both naive(More)