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- W1930372002 abstract "Abstract CD40, a TNF receptor family member, plays a central role in T cell-mediated B cell activation. We have recently demonstrated that CD27, another TNF receptor family member, was also involved in B cell regulation and enhanced Ig production. In this report we compare CD27 and CD40 signals in B cell function. We selectively mimicked the effect of T cell help by addition to peripheral blood B cells activated with Staphylococcus aureus Cowan I strain and IL-2 of irradiated 300-19 cells transfected with either the CD70 (CD27 ligand) gene or the CD154 (CD40 ligand) gene, the vector alone, or both CD70 and CD154 genes. CD27 ligation induced only a slight increase in B cell proliferation compared with the dramatic enhancement induced by CD40 ligation; double ligation proved to be less efficient than CD40 ligation alone. In contrast, IgG production was increased only by CD27 ligation alone. Moreover, the CD27 signal was more efficient when it was given on day 2 of the culture rather than on day 0. Phenotypic analysis of the activated cells showed that CD27 ligation increased the percentage of cells showing a plasma cell profile (CD19-, CD38+), whereas upon CD40 ligation most of the cells still had a germinal center-like phenotype (CD19+, CD38+). Our results suggest that the CD27 and CD40 signals are not synergistic but, rather, are complementary and involve distinct steps of T cell-dependent B cell activation. CD27 may be more important in the induction of plasma cell differentiation at a time when the expansion phase has already occurred." @default.
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- W1930372002 date "1997-09-15" @default.
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- W1930372002 title "CD154/CD40 and CD70/CD27 interactions have different and sequential functions in T cell-dependent B cell responses: enhancement of plasma cell differentiation by CD27 signaling." @default.
- W1930372002 doi "https://doi.org/10.4049/jimmunol.159.6.2652" @default.
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