Reactive Oxygen Species Modulation in Osteoclast Differentiation and Bone Loss

Bone remodelling depends on a balance between bone formation by osteoblasts and bone resorption by osteoclasts. Reactive oxygen species (ROS) such as superoxide and hydrogen peroxide serve as intracellular second messengers that amplify signal transduction during osteoclastogenesis. Under physiological conditions, controlled ROS production downstream of RANKL–RANK interaction activates kinases and transcription factors, notably NFATc1, to drive osteoclast differentiation. However, excessive or sustained ROS levels disrupt redox homeostasis, promote osteoclast overactivity and damage bone matrix, leading to pathological bone loss in disorders such as osteoporosis and inflammatory arthritis. Cells deploy antioxidant pathways—principally via Nrf2 activation and cytoprotective enzymes—to limit ROS accumulation. Emerging evidence highlights modulatory proteins such as DJ-1 and enzymatic sources like NADPH oxidase as key regulators of ROS tone in osteoclast precursors. Targeting ROS generation or enhancing ROS scavenging has become a promising strategy to rebalance bone turnover and prevent bone destruction, with both small-molecule antioxidants and natural compounds under investigation for therapeutic potential.

Research from Nature Portfolio

Investigations into intrinsic redox regulators have revealed that DJ-1 acts as a negative modulator of osteoclast differentiation by scavenging RANKL-induced ROS. Ablation of DJ-1 in murine models leads to increased ROS, heightened activation of TRAF6-dependent signalling and expansion of osteoclast populations, culminating in reduced bone volume. Restoration of DJ-1 function attenuates these effects and mitigates bone damage in inflammatory and RANKL-driven bone-loss models. Complementary studies have demonstrated that the NADPH oxidase subunit gp91phox generates superoxide essential for efficient NFATc1 induction. Mice deficient in gp91phox exhibit impaired osteoclastogenesis, elevated bone density and reduced expression of osteoclast markers, while exogenous H₂O₂ rescues differentiation defects. Together, these works establish redox-sensitive proteins and enzymatic ROS sources as pivotal nodes in osteoclast regulation and identify them as targets for bone-protective interventions.

Reactive Oxygen Species Modulation in Osteoclast Differentiation and Bone Loss publication trend

The graph below shows the total number of articles in reactive oxygen species modulation in osteoclast differentiation and bone loss across all publications each year (not limited to Nature Index journals).

Technical terms

Reactive oxygen species (ROS): chemically reactive molecules derived from oxygen that function in cell signalling and oxidative stress.

Osteoclastogenesis: the multistep process by which haematopoietic precursors differentiate into bone-resorbing osteoclasts.

RANKL: receptor activator of nuclear factor-κB ligand, a cytokine essential for osteoclast differentiation.

NFATc1: nuclear factor of activated T cells c1, a master transcription factor driving osteoclast-specific gene expression.

NADPH oxidase: a membrane-associated enzyme complex that produces superoxide anions during cellular signalling.

Nrf2: nuclear factor erythroid 2-related factor 2, a transcription factor that induces antioxidant and cytoprotective enzymes.

References

1. Myrislignan targets extracellular signal-regulated kinase (ERK) and modulates mitochondrial function to dampen osteoclastogenesis and ovariectomy-induced osteoporosis. Journal of Translational Medicine (2023).
2. Reactive Oxygen Species in Osteoclast Differentiation and Possible Pharmaceutical Targets of ROS-Mediated Osteoclast Diseases. International Journal of Molecular Sciences (2019).
3. Pseurotin A Inhibits Osteoclastogenesis and Prevents Ovariectomized-Induced Bone Loss by Suppressing Reactive Oxygen Species. Theranostics (2019).
4. The Keap1/Nrf2 Protein Axis Plays a Role in Osteoclast Differentiation by Regulating Intracellular Reactive Oxygen Species Signaling*. Journal of Biological Chemistry (2013).
5. DJ-1 controls bone homeostasis through the regulation of osteoclast differentiation. Nature Communications (2017).
6. NADPH oxidase gp91phox contributes to RANKL-induced osteoclast differentiation by upregulating NFATc1. Scientific Reports (2016).