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The actin binding protein adseverin regulates osteoclastogenesis
Siavash Hassanpour1, Hongwei Jiang2, Yongqiang Wang1
1Matrix Dynamics Group, Faculty of Dentistry, University of Toronto, Toronto, Ontario, Canada.
Plos One
|October 3, 2014
Summary
Adseverin (Ads) regulates osteoclastogenesis (OCG) by binding actin filaments. Ads is induced by RANK-ligand and is crucial for osteoclast formation, impacting cell differentiation and fusion.
Area of Science:
- Cell Biology
- Molecular Biology
- Biochemistry
Background:
- Adseverin (Ads) is an actin-binding protein regulating cytoskeleton dynamics.
- Previous studies linked Ads to cellular secretion and differentiation.
- The role of Ads in osteoclastogenesis (OCG) was previously unknown.
Purpose of the Study:
- To investigate the role of Adseverin (Ads) in regulating osteoclastogenesis (OCG).
- To determine the expression pattern and function of Ads during OCG.
- To elucidate the specific isoform involvement and downstream effects of Ads in OCG.
Main Methods:
- Generated Ads knockdown RAW264.7 macrophage cell lines.
- Utilized RNAi to knockdown Ads in osteoclast precursors.
- Analyzed TRAcP staining, multinucleation, F-actin distribution, and cell migration.
- Performed transient reintroduction of Ads to assess rescue effects.
Main Results:
- Ads expression is induced by RANK-ligand during OCG and high in mature osteoclasts.
- Ads knockdown severely impaired OCG, indicated by lack of TRAcP staining and multinucleation.
- Ads knockdown altered F-actin distribution, increased filopodia, enhanced migration, and limited cell fusion.
- Transient Ads reintroduction rescued TRAcP expression but not multinucleation.
Conclusions:
- Adseverin (Ads) is an early, RANKL-induced regulator of osteoclastogenesis (OCG).
- Ads plays a significant role in osteoclast precursor differentiation and fusion.
- The D5 isoform of Ads is not involved in OCG regulation.
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