eLife (Feb 2023)

Specific targeting of inflammatory osteoclastogenesis by the probiotic yeast S. boulardii CNCM I-745 reduces bone loss in osteoporosis

  • Maria-Bernadette Madel,
  • Julia Halper,
  • Lidia Ibáñez,
  • Lozano Claire,
  • Matthieu Rouleau,
  • Antoine Boutin,
  • Adrien Mahler,
  • Rodolphe Pontier-Bres,
  • Thomas Ciucci,
  • Majlinda Topi,
  • Christophe Hue,
  • Jerome Amiaud,
  • Salvador Iborra,
  • David Sancho,
  • Dominique Heymann,
  • Henri-Jean Garchon,
  • Dorota Czerucka,
  • Florence Apparailly,
  • Isabelle Duroux-Richard,
  • Abdelilah Wakkach,
  • Claudine Blin-Wakkach

DOI
https://doi.org/10.7554/eLife.82037
Journal volume & issue
Vol. 12

Abstract

Read online

Bone destruction is a hallmark of chronic inflammation, and bone-resorbing osteoclasts arising under such a condition differ from steady-state ones. However, osteoclast diversity remains poorly explored. Here, we combined transcriptomic profiling, differentiation assays and in vivo analysis in mouse to decipher specific traits for inflammatory and steady-state osteoclasts. We identified and validated the pattern-recognition receptors (PRR) Tlr2, Dectin-1, and Mincle, all involved in yeast recognition as major regulators of inflammatory osteoclasts. We showed that administration of the yeast probiotic Saccharomyces boulardii CNCM I-745 (Sb) in vivo reduced bone loss in ovariectomized but not sham mice by reducing inflammatory osteoclastogenesis. This beneficial impact of Sb is mediated by the regulation of the inflammatory environment required for the generation of inflammatory osteoclasts. We also showed that Sb derivatives as well as agonists of Tlr2, Dectin-1, and Mincle specifically inhibited directly the differentiation of inflammatory but not steady-state osteoclasts in vitro. These findings demonstrate a preferential use of the PRR-associated costimulatory differentiation pathway by inflammatory osteoclasts, thus enabling their specific inhibition, which opens new therapeutic perspectives for inflammatory bone loss.

Keywords