Exposure to certain synthetic chemicals called PFAS has been linked in scientific studies to lower fertility rates, higher chances of developing cancer, and disruptions in hormone function in humans.
Mechanism
Synthesis from 4 studies
PFAS chemicals build up in the body and mess with the hormones that control reproduction and cell growth. They stop the body from making sex hormones, damage sperm and eggs, prevent the liver from cleaning out toxins, and cause cells to grow out of control or survive when they should die — all of...
Most probable mechanism
PFAS chemicals build up in the body and interfere with hormone systems that control reproduction and cell growth. They block the production of key sex hormones like testosterone and estrogen, damage the cells that make eggs and sperm, and prevent the body from properly cleaning out harmful substances. At the same time, they trigger chronic inflammation, cause DNA damage, and stop cells from dying when they should, which allows abnormal cells to survive and turn into tumors. These effects happen together, making it harder to get pregnant and increasing the chance of cancer.
PFAS enter cells and bind to nuclear receptors such as PPARα, CAR, and PXR, altering gene expression patterns involved in lipid metabolism and xenobiotic detoxification.
PFAS inhibit key enzymes and transporters required for steroid hormone synthesis, including StAR, CYP11A1, aromatase, and 3β-HSD, reducing production of testosterone, estradiol, and progesterone.
PFAS disrupt thyroid hormone transport by competing with thyroxine for binding to transthyretin and inhibit iodide uptake via the sodium iodide symporter, leading to systemic hypothyroidism.
PFAS suppress the expression of recombination-activating genes in immune cells and inhibit bile acid transporters, impairing immune surveillance and liver detoxification.
PFAS induce oxidative stress by generating reactive oxygen species through mitochondrial dysfunction and peroxisomal β-oxidation, leading to DNA damage and genomic instability.
PFAS inhibit gap junctional communication and disrupt intracellular calcium signaling in ovarian and testicular cells, impairing follicular maturation, oocyte quality, and sperm function.
PFAS activate the NLRP3 inflammasome and suppress tumor suppressor genes through epigenetic modifications, promoting chronic inflammation and uncontrolled cell proliferation.
PFAS interfere with hypothalamic kisspeptin signaling, reducing gonadotropin-releasing hormone release and disrupting the hormonal cascade necessary for ovulation and spermatogenesis.
Less supported by current evidence, but not ruled out
Some PFAS molecules mimic estrogen by binding to a membrane-bound receptor, triggering rapid cellular signals that alter cell behavior without changing gene expression, which can disrupt reproductive and metabolic functions.
PFAS bind to the G protein-coupled estrogen receptor (GPER) on cell membranes.
GPER activation triggers intracellular calcium release and kinase signaling cascades.
These signals alter cell proliferation and survival pathways in estrogen-sensitive tissues.
Certain PFAS bind directly to platelets, causing them to clump together and release inflammatory signals, which may create conditions that favor tumor growth and tissue damage.
Long-chain PFAS bind to the GPIbα receptor on platelet surfaces.
This binding triggers calcium release and activates integrins that promote platelet aggregation.
Aggregated platelets release inflammatory mediators that alter local tissue environments.
Evidence from Studies
Supporting (3)
Community contributions welcome
Perfluoroalkyl and polyfluoroalkyl substances and Cancer risk: results from a dose-response Meta-analysis
Toxicological Effects and Health Impacts of Per- and Polyfluoroalkyl Substances (PFAS) in Humans
Gold Standard Evidence Needed
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