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The differentiation of naive CD4(+) T cells into distinct lineages plays critical roles in mediating adaptive immunity or maintaining immune tolerance. In addition to being a first line of defense, the innate immune system also actively instructs adaptive immunity through antigen presentation and immunoregulatory cytokine production. Here we found that sirtuin 1 (SIRT1), a type III histone deacetylase, plays an essential role in mediating proinflammatory signaling in dendritic cells (DCs), consequentially modulating the balance of proinflammatory T helper type 1 (TH1) cells and antiinflammatory Foxp3(+) regulatory T cells (T(reg) cells). Genetic deletion of SIRT1 in DCs restrained the generation of T(reg) cells while driving TH1 development, resulting in an enhanced T-cell-mediated inflammation against microbial responses. Beyond this finding, SIRT1 signaled through a hypoxia-inducible factor-1 alpha (HIF1α)-dependent pathway, orchestrating the reciprocal TH1 and T(reg) lineage commitment through DC-derived IL-12 and TGF-β1. Our studies implicates a DC-based SIRT1-HIF1α metabolic checkpoint in controlling T-cell lineage specification.

Dendritic cell SIRT1–HIF1α axis programs the differentiation of CD4 + T cells through IL-12 and TGF-β1

Dendritic cell SIRT1–HIF1α axis programs the differentiation of CD4 ⁺ T cells through IL-12 and TGF-β1