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Updated: Jun 21, 2026

A RANKL-based Osteoclast Culture Assay of Mouse Bone Marrow to Investigate the Role of mTORC1 in Osteoclast Formation
Published on: March 15, 2018
Nrf2 dynamically regulates RANKL-induced osteoclastogenesis and cathepsin K function.
Cesar A Speck-Hernandez1, Taíssa C de Souza Furtado2, Laisa Y de Souza3
1Center for Research in Inflammatory Diseases, Ribeirao Preto Medical School, University of Sao Paulo, Ribeirao Preto, Brazil; Department of Pharmacology, Ribeirao Preto Medical School, University of Sao Paulo, Ribeirao Preto, Brazil; Laboratory of Bone Biology, Department of Biomolecular Sciences, School of Pharmaceutical Sciences, Ribeirão Preto, University of São Paulo, Ribeirão Preto, Brazil.
Nuclear factor erythroid 2-related factor 2 (Nrf2) is crucial for osteoclast function. It balances reactive oxygen species (ROS) and maintains lysosomal integrity, impacting bone resorption and Cathepsin K activity.
Area of Science:
- Cell Biology
- Biochemistry
- Immunology
Background:
- Osteoclasts resorb bone via Cathepsin K.
- RANKL signaling drives osteoclastogenesis and reactive oxygen species (ROS) production.
- Excessive ROS causes cellular damage, countered by antioxidant defenses like the Nrf2 pathway.
Purpose of the Study:
- To investigate the dynamic regulation of antioxidant responses during osteoclastogenesis and activation.
- To elucidate the dual role of RANKL in modulating antioxidant defenses in osteoclasts.
- To determine the specific functions of Nrf2 in osteoclast differentiation and resorptive activity.
Main Methods:
- Bioinformatic analysis.
- Genetic manipulation using engineered mouse models.
- In vitro studies of Nrf2-deficient osteoclasts.
Main Results:
- RANKL differentially regulates antioxidant responses, suppressing glutathione defenses while activating Nrf2.
- Nrf2 deficiency enhances osteoclast formation but impairs resorptive function and Cathepsin K activity.
- Nrf2-deficient osteoclasts show increased lipid peroxidation, mitochondrial dysfunction, and lysosomal instability.
Conclusions:
- Nrf2 is a critical regulator of osteoclast function, essential for redox balance and lysosomal integrity.
- Nrf2 plays a key role in maintaining osteoclast resorptive capacity.
- This study highlights the intricate interplay between RANKL-induced oxidative signaling and Nrf2-mediated antioxidant regulation in bone resorption.
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