Anaïs Levescot, Margaret H Chang, Julia Schnell, Nathan Nelson-Maney, Jing Yan, Marta Martínez-Bonet, Ricardo Grieshaber-Bouyer, Pui Y Lee, Kevin Wei, Rachel B Blaustein, Allyn Morris, Alexandra Wactor, Yoichiro Iwakura, James A Lederer, Deepak A Rao, Julia F Charles, Peter A Nigrovic.
J Clin Invest. 2021 Sep 15;131(18):e141008.
IL-1β is a proinflammatory mediator with roles in innate and adaptive immunity.
Here we show that IL-1β contributes to autoimmune arthritis by inducing osteoclastogenic capacity in Tregs.
Using mice with joint inflammation arising through deficiency of the IL-1 receptor antagonist (Il1rn-/-), we observed that IL-1β blockade attenuated disease more effectively in early arthritis than in established arthritis, especially with respect to bone erosion.
Protection was accompanied by a reduction in synovial CD4+Foxp3+ Tregs that displayed preserved suppressive capacity and aerobic metabolism but aberrant expression of RANKL and a striking capacity to drive RANKL-dependent osteoclast differentiation.
Both Il1rn-/- Tregs and wild-type Tregs differentiated with IL-1β accelerated bone erosion upon adoptive transfer.
Human Tregs exhibited analogous differentiation, and corresponding RANKLhiFoxp3+ T cells could be identified in rheumatoid arthritis synovial tissue.
Together, these findings identify IL-1β-induced osteoclastogenic Tregs as a contributor to bone erosion in arthritis.
IL-1β-driven osteoclastogenic Tregs accelerate bone erosion in arthritis – PubMed (nih.gov)