Impact of Environmental Toxins on Female Reproductive Health

Environmental toxins—including endocrine-disrupting chemicals, heavy metals, polycyclic aromatic hydrocarbons and airborne pollutants—pose a significant threat to female reproductive health worldwide. These agents interfere with hormone synthesis, folliculogenesis and oocyte quality, leading to diminished ovarian reserve, altered meiotic progression and impaired fertility. Exposure may occur via diet, air pollution, occupational contact and lifestyle factors such as tobacco smoking. At the cellular level, toxins induce oxidative stress, mitochondrial dysfunction and DNA damage in oocytes and supporting granulosa cells, disrupting nuclear and cytoplasmic maturation and reducing embryo viability. Developmental exposure during gestation not only compromises fertility in the exposed female, but can elicit transgenerational effects by reprogramming germ cell transcriptomes and accelerating reproductive ageing in offspring. The global decline in fertility rates underscores the need for deeper mechanistic insight, robust biomarker discovery and targeted gonadoprotective interventions to safeguard women’s reproductive lifespan.

Research from Nature Portfolio

Recent studies have demonstrated that prenatal exposure to benzo[a]pyrene depletes ovarian germ cell populations across multiple generations. This pollutant induces transcriptomic alterations in embryonic germ cells that masculinise female identity and accelerate follicular senescence, resulting in a reduced ovarian reserve in F2 and F3 descendants. Complementing these findings, investigations into the multidrug resistance transporter MDR-1 have revealed its critical role in oocyte mitochondria for metabolite regulation and protection against oxidative insult. Dysfunction or absence of MDR-1 leads to accumulation of tricarboxylic acid cycle intermediates, elevated reactive oxygen species, disrupted mitochondrial membrane potential and transcriptional shifts that render oocytes more susceptible to gonadotoxic agents.

Impact of Environmental Toxins on Female Reproductive Health publication trend

The graph below shows the total number of articles in impact of environmental toxins on female reproductive health across all publications each year (not limited to Nature Index journals).

Technical terms

Folliculogenesis: The process by which ovarian follicles develop from primordial to preovulatory stages.

Primordial follicle: The earliest, dormant stage of the follicle pool formed during fetal or early postnatal life.

Oocyte: The female gamete or egg cell undergoing growth and meiotic maturation in the ovary.

Oxidative stress: An imbalance between production of reactive oxygen species and antioxidant defences.

Reactive oxygen species (ROS): Highly reactive molecules derived from oxygen that can damage lipids, proteins and DNA.

Mitochondrial membrane potential: The electrochemical gradient across the mitochondrial inner membrane essential for ATP synthesis.

Polycyclic aromatic hydrocarbons (PAHs): A class of persistent environmental pollutants composed of fused aromatic rings.

Transgenerational inheritance: Transmission of phenotypic effects to subsequent generations not directly exposed to the original insult.

References

1. Prenatal exposure to benzo[a]pyrene depletes ovarian reserve and masculinizes embryonic ovarian germ cell transcriptome transgenerationally. Scientific Reports (2023).
2. Dysfunctional MDR-1 disrupts mitochondrial homeostasis in the oocyte and ovary. Scientific Reports (2019).
3. Premature ovarian insufficiency: a review on the role of tobacco smoke, its clinical harm, and treatment. Journal of Ovarian Research (2024).
4. Fertility loss: negative effects of environmental toxicants on oogenesis. Frontiers in Physiology (2023).
5. Inhibitory Effects of 3-Methylcholanthrene Exposure on Porcine Oocyte Maturation. International Journal of Molecular Sciences (2023).