Oxidative Stress and Male Infertility Mechanisms

Male infertility affects an estimated half of infertile couples worldwide and is increasingly linked to a pathological imbalance between pro-oxidant species and antioxidant defences. Oxidative stress arises when reactive oxygen species (ROS) generated by mitochondrial respiration, inflammatory cells or environmental insults overwhelm enzymatic and non-enzymatic antioxidants in the testis and the seminal fluid. Excessive ROS trigger lipid peroxidation of sperm membranes, strand breaks in sperm DNA, oxidation of proteins critical for motility and capacitation, and perturbation of redox-sensitive signalling pathways. In the context of varicocele, heat stress, venous stasis and local hypoxia amplify ROS production and activate inflammatory cascades, further compromising the blood-testis barrier and Leydig and Sertoli cell function. Endoplasmic reticulum stress, autophagy and activation of inflammasomes converge on mitochondrial apoptosis pathways, leading to germ cell loss and impaired spermatogenesis. Advances in understanding these molecular circuits are guiding new strategies—including dietary antioxidants, immunomodulators and gene-targeted approaches—to preserve or restore fertility. Emerging evidence also suggests that long non-coding RNAs and hypoxia-inducible factors modulate redox homeostasis and may serve as both biomarkers and therapeutic targets in oxidative-stress-driven male infertility.

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Oxidative Stress and Male Infertility Mechanisms publication trend

The graph below shows the total number of articles in oxidative stress and male infertility mechanisms across all publications each year (not limited to Nature Index journals).

Technical terms

Reactive oxygen species (ROS): chemically reactive molecules derived from oxygen that can oxidise lipids, proteins and nucleic acids.

Lipid peroxidation: oxidative degradation of membrane lipids that impairs cell integrity and fluidity.

Blood-testis barrier (BTB): specialised junctional complex between Sertoli cells that protects germ cells from toxins and immune cells.

Apoptosis: programmed cell death involving caspase activation and DNA fragmentation.

Hypoxia-inducible factor (HIF): transcription factor stabilised under low oxygen that regulates genes involved in metabolism and angiogenesis.

Long non-coding RNA (lncRNA): RNA transcripts longer than 200 nucleotides that do not code for protein but regulate gene expression.

References

1. Positive Effects of the Nutraceutical Association of Lycopene and Selenium in Experimental Varicocele. International Journal of Molecular Sciences (2023).
2. Role of Oxidative Stress in Varicocele. Frontiers in Genetics (2022).
3. Hypoxia-related long noncoding RNAs are associated with varicocele-related male infertility. PLOS ONE (2020).