Fluoride-Induced Oxidative Stress and Organ Toxicity

Fluoride, while beneficial at low concentrations for dental health, can provoke widespread cellular damage when ingested in excess. This ion readily penetrates cells and accumulates in mitochondria, initiating the overproduction of reactive oxygen species (ROS) that overwhelm intrinsic antioxidant defences. The ensuing oxidative stress drives lipid peroxidation, protein oxidation and DNA damage, triggering pathways of endoplasmic reticulum (ER) stress and mitochondrial dysfunction. In the kidney, these processes compromise energy metabolism and activate intrinsic apoptosis cascades, leading to nephrotoxicity. In the liver, ER stress and disrupted amino acid metabolism provoke hepatocellular injury. Vascular smooth muscle and immune cells are similarly vulnerable, resulting in impaired cardiovascular function and altered immune responses. Reproductive tissues exposed to excess fluoride exhibit mitochondrial impairment, DNA damage and apoptotic loss of germ cells. Collectively, these mechanisms underlie a spectrum of organ dysfunction—nephrotoxicity, hepatotoxicity, cardiotoxicity and reproductive deficits—and have significant implications for populations in regions with high natural fluoride levels. Understanding the molecular mediators of redox imbalance and stress signalling is essential for developing targeted interventions and refining water-fluoridation policies.

Research from Nature Portfolio

Investigations have delineated a central role for the mitochondrial deacetylase SIRT3 in moderating renal fluoride toxicity. Sodium fluoride impairs mitochondrial ultrastructure and elevates mitochondrial ROS, while SIRT3 overexpression restores antioxidant enzyme activity and mitigates apoptosis, revealing a NRF2/PGC-1α–SIRT3 axis as a potential therapeutic target. In reproductive biology, studies on porcine oocytes demonstrate that sodium fluoride disrupts mitochondrial membrane potential, induces DNA damage responses and increases early apoptosis, collectively impairing polar body extrusion and subsequent embryonic development. These findings underscore the importance of redox-sensitive signalling in both renal and reproductive systems and identify key molecular nodes for future protective strategies.

Fluoride-Induced Oxidative Stress and Organ Toxicity publication trend

The graph below shows the total number of articles in fluoride-induced oxidative stress and organ toxicity across all publications each year (not limited to Nature Index journals).

Technical terms

Oxidative stress: Imbalance between ROS generation and antioxidant defences leading to cellular injury.

Reactive oxygen species (ROS): Highly reactive oxygen derivatives, such as superoxide and hydrogen peroxide.

SIRT3: A mitochondrial deacetylase that regulates antioxidant enzyme activity and mitochondrial homeostasis.

Endoplasmic reticulum (ER) stress: Accumulation of misfolded proteins in the ER that activates the unfolded protein response.

Mitochondrial dysfunction: Impairment of mitochondrial respiratory chain function, resulting in energy deficits and enhanced ROS production.

Apoptosis: Programmed cell death executed via intrinsic or extrinsic signalling pathways.

References

1. Fluoride impairs vascular smooth muscle A7R5 cell lines via disrupting amino acids metabolism. Journal of Translational Medicine (2024).
2. Analysis of Toxic Effects of Fluoride on Ovine Follicular Granulosa Cells Using RNA-Seq. Antioxidants (2024).
3. Progress in research on the role of fluoride in immune damage. Frontiers in Immunology (2024).
4. Sodium fluoride induces nephrotoxicity via oxidative stress-regulated mitochondrial SIRT3 signaling pathway. Scientific Reports (2017).
5. Sodium fluoride exposure exerts toxic effects on porcine oocyte maturation. Scientific Reports (2017).