Function of CD27 in helper T cell differentiation.
Immunology Letters(2011)
摘要
Differentiation of naïve CD4+ T cells to functional effector T-helper (TH) cells is driven by both costimulatory molecules and cytokines. Although polarizing cytokines can induce the differentiation into a particular TH-subset, certain costimulatory molecules also seem to affect this polarization process. We have previously found that CD70-transgenic (CD70TG) mice develop large numbers of IFN-γ-producing CD4+ T cells and we therefore questioned whether CD27 triggering provides an instructive signal for TH1 differentiation or rather supports TH cell formation in general. Although CD70TG mice on a TH1-prone C57Bl/6J background develop more TH1 cells, we found that this phenotype is lost when CD70TG mice are fully backcrossed on a TH2-prone Balb/c background, but is not replaced with more TH2 cells. Furthermore, CD70-overexpression is not sufficient to drive TH17 cell formation, nor does it affect the generation of FoxP3+ regulatory T cells. Using an in vitro setting, we found that CD27-triggering does not provide instructive signals for a specific TH cell subset, but, depending on the cytokine milieu and genetic background, supports TH1 cell formation, while it inhibits the formation of TH17 but not TH2 cells. Induction of allergic airway inflammation in CD70TG Balb/c mice further illustrates that CD27 plays a supportive role in TH1 differentiation in vivo, without modulating the classical TH2 response. This supportive role of CD27 in TH cell polarization could not be attributed to a specific change of transcription factor expression levels. In summary, this study indicates that CD27 signalling does influence TH cell differentiation, but that it is highly dependent on the conditions and genetic background.
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关键词
AAI,APC,TH,TNFR
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