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Receptor Activator of Nuclear Factor (Nf)-kb Ligand Promotes T Helper 17 Cell Differentiation through Fas
Zilin Cui1, Rui Feng1, Zirong Liu1
1Department of Hepatobiliary Surgery, Tianjin First Central Hospital, Tianjin, China.
Abstract:
T helper 17 (Th17) cells play important role in the defense against pathogens and autoimmune diseases. Many cytokines can induce Th17 cell differentiation. However, the mechanism of Th17 cell differentiation is not well clarified. RankL, a member of the TNF superfamily, binds with Rank and then participates in the proliferation and differentiation of many kinds of cells. Recent studies showed that RankL-Rank signaling is closely related to Th17 differentiation and function. The detail of the Rank-RankL pathway in Th17 cell differentiation is still unclear. To illustrate the role of Rank-RankL in Th17 differentiation, naive CD4 + T cells were differentiated into Th17 cells with or without RankL stimulation. During Th17 differentiation, the expression of Rank obviously increased. The RankL stimulation significantly increased Th17 cell differentiation indicated by increased IL-17-positive cell number, highly expressed IL-17 and IL-22 and elevated IL-17 secretion. These effects were canceled by Rank-Fc addition. In further study, RankL treatment during Th17 differentiation up-regulated Fas expression. Fas knockdown inhibited the Th17 differentiation promoted by RankL. In this study, it was confirmed that Rank-RankL signaling could promote Th17 cell differentiation through Fas induction.
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