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The F-actin modulator SWAP-70 controls podosome patterning in osteoclasts

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Title: The F-actin modulator SWAP-70 controls podosome patterning in osteoclasts
Authors: Roscher, A. Browse this author
Hasegawa, T. Browse this author →KAKEN DB
Dohnke, S. Browse this author
Ocana-Morgner, C. Browse this author
Amizuka, N. Browse this author
Jessberger, R. Browse this author
Garbe, AI. Browse this author
Keywords: Actin cytoskeleton
Podosome pattering
Membrane binding
Issue Date: Dec-2016
Publisher: Elsevier
Journal Title: Bone reports
Volume: 5
Start Page: 214
End Page: 221
Publisher DOI: 10.1016/j.bonr.2016.07.002
Abstract: Osteoclasts are bone resorbing cells acting as key mediators of bone disorders. Upon adhesion to bone, osteoclasts polarize and reorganize their cytoskeleton to generate a ring-like F-actin-rich structure, the sealing zone, wherein the osteoclast's resorptive organelle, the ruffled border, is formed. The dynamic self-organization of actin-rich adhesive structures, the podosomes, from clusters to belts is crucial for osteoclast-mediated bone degradation. Mice lacking the protein SWAP-70 display an osteopetrotic phenotype due to defective bone resorption caused by impaired actin ring formation in Swap-70−/− osteoclasts. To further elucidate the mechanisms underlying this defect, we investigated the specific function of SWAP-70 in the organization and dynamics of podosomes. These detailed studies show that the transition from podosome clusters to rings is impaired in Swap-70−/− osteoclasts. Live cell imaging of dynamic F-actin turnover and SWAP-70 localization during podosome patterning indicate that SWAP-70 is dispensable for cluster formation but plays a key role in F-actin ring generation. Our data provide insights in the role of SWAP-70's F-actin binding domain and pleckstrin homology (PH) domain in the proper localization of SWAP-70 and formation of a peripheral podosome belt, respectively. Ex vivo bone analyses revealed that SWAP-70-deficient osteoclasts exhibit defective ruffled border formation and V-ATPase expression. Our findings suggest an important role of membrane binding of SWAP-70 for the regulation of actin dynamics, which is essential for podosome patterning, and thus for the resorptive activity of osteoclasts.
Type: article
Appears in Collections:歯学院・歯学研究院 (Graduate School of Dental Medicine / Faculty of Dental Medicine) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 長谷川 智香

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