Regulation of bone mass and osteoclast function depend on the F-actin modulator SWAP-70

Publikation: Beitrag in FachzeitschriftForschungsartikelBeigetragenBegutachtung

Beitragende

Abstract

Bone remodeling involves tightly regulated bone-resorbing osteoclasts and bone-forming osteoblasts. Determining osteoclast function is central to understanding bone diseases such as osteoporosis and osteopetrosis. Here, we report a novel function of the F-actin binding and regulatory protein SWAP-70 in osteoclast biology. F-actin ring formation, cell morphology, and bone resorption are impaired in Swap-70-/- osteoclasts, whereas the expression of osteoclast differentiation markers induced in vitro by macrophage colony-stimulating factor (M-CSF) and receptor activator of NF-ÎB ligand (RANKL) remains unaffected. Swap-70-/- mice develop osteopetrosis with increased bone mass, abnormally dense bone, and impaired osteoclast function. Ectopic expression of SWAP-70 in Swap-70-/- osteoclasts in vitro rescues their deficiencies in bone resorption and F-actin ring formation. Rescue requires a functional pleckstrin homology (PH) domain, known to support membrane localization of SWAP-70, and the F-actin binding domain. Transplantation of SWAP-70-proficient bone marrow into Swap-70-/- mice restores osteoclast resorption capacity in vivo. The identification of the role of SWAP-70 in promoting osteoclast function through modulating membrane-proximal F-actin rearrangements reveals a new pathway to control osteoclasts and bone homeostasis.

Details

OriginalspracheEnglisch
Seiten (von - bis)2085-2096
Seitenumfang12
FachzeitschriftJournal of bone and mineral research
Jahrgang27
Ausgabenummer10
PublikationsstatusVeröffentlicht - Okt. 2012
Peer-Review-StatusJa

Externe IDs

PubMed 22648978
ORCID /0000-0002-8691-8423/work/163763697

Schlagworte

Ziele für nachhaltige Entwicklung

Schlagwörter

  • BONE, F-ACTIN, OSTEOCLASTS, RESORPTION, SWAP-70