Oxidative Stress Effects on Bone Metabolism

Bone remodelling relies on a tightly regulated balance between osteoblast-mediated formation and osteoclast-driven resorption. Reactive oxygen species (ROS), produced as by-products of mitochondrial respiration and enzymatic reactions, become deleterious when their generation exceeds the capacity of endogenous antioxidant systems. Under such oxidative stress, osteoblastic differentiation and function are impaired, while osteoclastogenesis is enhanced. Redox imbalance thus undermines matrix synthesis, favours bone resorption and shifts bone remodelling towards net loss.

At the molecular level, oxidative stress interrupts signalling pathways critical to bone cell survival. Excess ROS disrupt mitochondrial membrane potential in osteoblasts, triggering apoptotic cascades and reducing bone formation. In osteoclast precursors, oxidants upregulate key cytokines and transcription factors, such as receptor activator of nuclear factor-κB ligand (RANKL), thereby amplifying osteoclast activity. Counter-regulatory mechanisms centre on the Nrf2–Keap1 axis: under stress, Nrf2 stabilisation induces antioxidant enzyme expression, but chronic redox challenge can override this protection. Over time, persistent oxidative stress contributes to age-related bone fragility, postmenopausal osteoporosis and delayed fracture healing, underscoring the global health burden of redox-mediated skeletal decline. Emerging therapeutic strategies aim to restore redox homeostasis and preserve bone mass, spanning dietary antioxidants, small-molecule activators of cytoprotective pathways and targeted modulation of bone-cell specific redox sensors.

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Oxidative Stress Effects on Bone Metabolism publication trend

The graph below shows the total number of articles in oxidative stress effects on bone metabolism across all publications each year (not limited to Nature Index journals).

Technical terms

Reactive oxygen species (ROS): Chemically reactive oxygen-derived molecules that at high levels cause oxidative damage.

Oxidative stress: A state in which ROS production exceeds antioxidant defences, leading to cellular dysfunction.

Osteoblast: Bone-forming cell responsible for synthesis and mineralisation of bone matrix.

Osteoclast: Multinucleated cell specialised in bone resorption and matrix degradation.

Nrf2: Transcription factor that, when activated, induces expression of antioxidant and cytoprotective genes.

Keap1: Cytosolic inhibitor of Nrf2 that directs it to degradation under low-stress conditions.

RANKL: Cytokine essential for osteoclast differentiation and activation, driving bone resorption.

References

1. Pyrroloquinoline quinone alleviates natural aging‐related osteoporosis via a novel MCM3‐Keap1‐Nrf2 axis‐mediated stress response and Fbn1 upregulation. Aging Cell (2023).
2. Garcinol prevents oxidative stress-induced bone loss and dysfunction of BMSCs through NRF2-antioxidant signaling. Cell Death Discovery (2024).
3. TRIM33 protects osteoblasts from oxidative stress‐induced apoptosis in osteoporosis by inhibiting FOXO3a ubiquitylation and degradation. Aging Cell (2021).
4. Reactive Oxygen Species Stimulates Receptor Activator of NF-κB Ligand Expression in Osteoblast*. Journal of Biological Chemistry (2005).
5. Role of Nrf2 in bone metabolism. Journal of Biomedical Science (2015).