Bibliographic Details
| Title: |
Rhythmic IL-17 production by γδ T cells maintains adipose de novo lipogenesis |
| Authors: |
Douglas, Aaron, Stevens, Brenneth, Rendas, Miguel, Kane, Harry, Lynch, Evan, Kunkemoeller, Britta, Wessendorf-Rodriguez, Karl, Day, Emily A., Sutton, Caroline, Brennan, Martin, O’Brien, Katie, Kohlgruber, Ayano C., Prendeville, Hannah, Garza, Amanda E., O’Neill, Luke A. J., Mills, Kingston H. G., Metallo, Christian M., Veiga-Fernandes, Henrique, Lynch, Lydia |
| Source: |
Nature; 20240101, Issue: Preprints p1-9, 9p |
| Abstract: |
The circadian rhythm of the immune system helps to protect against pathogens1–3; however, the role of circadian rhythms in immune homeostasis is less well understood. Innate T cells are tissue-resident lymphocytes with key roles in tissue homeostasis4–7. Here we use single-cell RNA sequencing, a molecular-clock reporter and genetic manipulations to show that innate IL-17-producing T cells—including γδ T cells, invariant natural killer T cells and mucosal-associated invariant T cells—are enriched for molecular-clock genes compared with their IFNγ-producing counterparts. We reveal that IL-17-producing γδ (γδ17) T cells, in particular, rely on the molecular clock to maintain adipose tissue homeostasis, and exhibit a robust circadian rhythm for RORγt and IL-17A across adipose depots, which peaks at night. In mice, loss of the molecular clock in the CD45 compartment (Bmal1∆Vav1) affects the production of IL-17 by adipose γδ17 T cells, but not cytokine production by αβ or IFNγ-producing γδ (γδIFNγ) T cells. Circadian IL-17 is essential for de novo lipogenesis in adipose tissue, and mice with an adipocyte-specific deficiency in IL-17 receptor C (IL-17RC) have defects in de novo lipogenesis. Whole-body metabolic analysis in vivo shows that Il17a−/−Il17f−/−mice (which lack expression of IL-17A and IL-17F) have defects in their circadian rhythm for de novo lipogenesis, which results in disruptions to their whole-body metabolic rhythm and core-body-temperature rhythm. This study identifies a crucial role for IL-17 in whole-body metabolic homeostasis and shows that de novo lipogenesis is a major target of IL-17. |
| Database: |
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