| First Author | Li M | Year | 2022 |
| Journal | Dev Cell | Volume | 57 |
| Issue | 20 | Pages | 2365-2380.e8 |
| PubMed ID | 36243012 | Mgi Jnum | J:359735 |
| Mgi Id | MGI:7380228 | Doi | 10.1016/j.devcel.2022.09.013 |
| Citation | Li M, et al. (2022) Gasdermin D maintains bone mass by rewiring the endo-lysosomal pathway of osteoclastic bone resorption. Dev Cell 57(20):2365-2380.e8 |
| abstractText | Gasdermin D (GSDMD)-mediated pyroptosis induces immunogenic cell death and promotes inflammation. However, the functions of GSDMD in tissue homeostasis remain unclear. Here, we identify a physiological function of GSDMD in osteoclasts via a non-lytic p20-generated protein, which prevents bone loss to maintain bone homeostasis. In the late stage of RANKL-induced osteoclastogenesis, GSDMD underwent cleavage, which is dependent on RIPK1 and caspase-8/-3, to yield this p20 product. Gsdmd-deficient osteoclasts showed normal differentiation but enhanced bone resorption with excessive lysosomal activity. Mice with complete or myeloid-specific Gsdmd deletion exhibited increased trabecular bone loss and more severe aging/ovariectomy-induced osteoporosis. GSDMD p20 was preferentially localized to early endosomes and limited endo-lysosomal trafficking and maturation, relying on its oligomerization and control of phosphoinositide conversion by binding to phosphatidylinositol 3-phosphate (PI(3)P). We have thus identified an anti-osteoclastic function of GSDMD as a checkpoint for lysosomal maturation and secretion and linked this to bone homeostasis and endosome-lysosome biology. |
