title: Maturation- and differentiation-dependent responsiveness of human CD4+ T helper subsets.
abstract: The human CD45R0+ (memory) CD4+ T cell population can be subdivided into a large (82%) CD27+ and a small (18%) CD27- subset. Within the CD45R0+CD27- subset, cells accumulate that have been persistently stimulated by Ag in vivo. As an apparent consequence, TLC with a differentiated functional phenotype, producing either high levels of IFN-gamma (Th1-like), high levels of IL-4 (Th2-like) or high amounts of both these cytokines (here referred to as Thx) can primarily be generated from the CD27- memory CD4+ T cell subset. In this study we examined the requirements for induction of proliferation of distinct CD4+CD45R0+ Th subsets. Immobilized CD3 mAb induced proliferation with comparable magnitude and kinetics in all types of TLC. However, interference with intracellular signaling pathways in this activation system, resulted in a strong inhibition of proliferation in TLC derived from CD27+ cells whereas, in contrast, TLC from CD27- cells were relatively resistant to elevation of [cAMP]i, inhibition of protein kinase C activation and the immunosuppressive effects of cyclosporin A. Stimulation with CD3 mAb in soluble form resulted in Il-4 secretion by Th2-like and Thx-type TLC but did not induce IFN-gamma or Il-2 secretion in any Th subset. Interestingly, Th2-like cells but not Thx-type cells were able to use endogenously produced Il-4 for proliferation. These data demonstrate a differential sensitivity of CD45R0+CD4+ Th subsets for immune activation and suppression, which correlated with their maturation stage, as reflected by CD27 membrane expression, as well as with their effector phenotype.
authors.affiliation: Department of Clinical Viro-Immunology, The Netherlands Red Cross Blood Transfusion Service, Amsterdam.
authors.forename: R
authors.initials: R
authors.lastname: de Jong
authors.forename: M
authors.initials: M
authors.lastname: Brouwer
authors.forename: H M
authors.initials: HM
authors.lastname: Kuiper
authors.forename: B
authors.initials: B
authors.lastname: Hooibrink
authors.forename: F
authors.initials: F
authors.lastname: Miedema
authors.forename: R A
authors.initials: RA
authors.lastname: van Lier
mesh_terms: D000911:Antibodies, Monoclonal / Q000276:immunology; D015703:Antigens, CD / Q000032:analysis; D000945:Antigens, Differentiation, T-Lymphocyte / Q000032:analysis; D017252:CD3 Complex / Q000032:analysis; D015704:CD4 Antigens / Q000032:analysis; D002454:Cell Differentiation; D002478:Cells, Cultured; D006801:Humans; D015847:Interleukin-4 / Q000502:physiology; D017493:Leukocyte Common Antigens / Q000032:analysis; D008213:Lymphocyte Activation; D006377:T-Lymphocytes, Helper-Inducer / Q000276:immunology*; D018127:Tumor Necrosis Factor Receptor Superfamily, Member 7
chemical_list: D000911:Antibodies, Monoclonal; D015703:Antigens, CD; D000945:Antigens, Differentiation, T-Lymphocyte; D017252:CD3 Complex; D015704:CD4 Antigens; D018127:Tumor Necrosis Factor Receptor Superfamily, Member 7; D015847:Interleukin-4; D017493:Leukocyte Common Antigens