Mitochondrial Dysfunction in Osteoporosis Pathogenesis

As populations age globally, osteoporosis has become a leading public health concern. Central to bone homeostasis is the dynamic interplay between bone‐forming osteoblasts, bone‐resorbing osteoclasts and mechanosensitive osteocytes. Mitochondria serve not only as cellular powerhouses but also as regulators of redox signalling, calcium handling and programmed cell death within these bone cells. Dysregulation of mitochondrial quality control—encompassing biogenesis, fission, fusion and selective autophagy (mitophagy)—can shift the balance towards excess resorption or impaired formation. Accumulation of dysfunctional mitochondria leads to elevated reactive oxygen species, disrupted energy supply and aberrant signalling through pathways such as AMPK-PGC-1β, PINK1-PRKN and SIRT3-FOXO3A. These disturbances promote osteoblast apoptosis, osteoclast overactivation and compromised angiogenesis within cortical bone. Understanding mitochondrial contributions to bone fragility offers novel avenues for diagnosis and therapy, from targeting deacetylases and mitophagy regulators to harnessing extracellular vesicles for mitochondrial delivery.

Research from Nature Portfolio

Recent studies highlight a critical role for mitochondrial transfer from osteocytes to support bone vasculature. Partial ablation of osteocytes or genetic disruption of mitochondrial transport proteins leads to regression of transcortical vessels, while supplementation of isolated osteocyte mitochondria restores endothelial function and accelerates angiogenesis in cortical defects. Parallel work has elucidated SIRT3 as an intrinsic inhibitor of osteoclastogenesis: mice lacking SIRT3 exhibit osteopenia due to enhanced RANKL-driven resorption, whereas SIRT3 activation stabilises AMPK phosphorylation, restrains osteoclast maturation and preserves bone mass. Together, these findings underscore mitochondria as intercellular mediators and intracellular checkpoints in skeletal integrity.

Mitochondrial Dysfunction in Osteoporosis Pathogenesis publication trend

The graph below shows the total number of articles in mitochondrial dysfunction in osteoporosis pathogenesis across all publications each year (not limited to Nature Index journals).

Technical terms

Mitophagy: Selective autophagic removal of damaged mitochondria to maintain cellular health.

Osteogenesis: The process by which osteoblasts form new bone tissue.

Reactive oxygen species (ROS): Chemically reactive molecules derived from oxygen that can signal or damage cells.

Fusion and fission: Opposing mitochondrial dynamics that regulate organelle shape, distribution and turnover.

SIRT3: A mitochondrial deacetylase that modulates energy metabolism and oxidative stress response.

References

1. Osteocyte mitochondria regulate angiogenesis of transcortical vessels. Nature Communications (2024).
2. Nicotinamide enhances osteoblast differentiation through activation of the mitochondrial antioxidant defense system. Experimental & Molecular Medicine (2023).
3. Sirtuin 3 (SIRT3) maintains bone homeostasis by regulating AMPK-PGC-1β axis in mice. Scientific Reports (2016).
4. PINK1 deficiency impairs osteoblast differentiation through aberrant mitochondrial homeostasis. Stem Cell Research & Therapy (2021).
5. Mitochondrial quality control and its role in osteoporosis. Frontiers in Endocrinology (2023).
6. Biophysical Modulation of the Mitochondrial Metabolism and Redox in Bone Homeostasis and Osteoporosis: How Biophysics Converts into Bioenergetics. Antioxidants (2021).