People with breast cancer tend to have higher levels of a chemical called PFOA in their blood than people without breast cancer. This difference may indicate that PFOA builds up in breast tissue and...
Mechanism
Synthesis from 1 study
PFOA builds up in breast cells and messes up three key systems: how cells communicate, how they remove toxins, and how their genes are controlled. This combination causes cells to grow abnormally, accumulate DNA damage, and avoid dying, which can lead to cancer.
Most probable mechanism
PFOA builds up in breast tissue and interferes with how cells talk to each other, stops the body from removing harmful substances, and changes how genes are turned on or off. This causes cells to grow uncontrollably, accumulate DNA damage, and survive when they should die, leading to cancer.
PFOA enters breast epithelial cells through passive diffusion or membrane transporters and accumulates due to its chemical stability and resistance to metabolic breakdown
PFOA inhibits gap junctional intercellular communication by disrupting connexin proteins and calcium signaling, impairing coordinated cell behavior and loss of growth control
PFOA suppresses UDP-glucuronosyltransferase enzymes, reducing the detoxification and elimination of endogenous estrogens and environmental carcinogens
PFOA inhibits DNA methyltransferase activity, causing global hypomethylation and gene-specific hypermethylation that silences tumor suppressors and activates oncogenes
Accumulated carcinogens and estrogen metabolites generate reactive oxygen species, inducing oxidative DNA damage and genomic instability
DNA damage and disrupted signaling pathways impair apoptosis, allowing damaged cells to survive and proliferate
Chronic cellular stress and epigenetic dysregulation create a microenvironment conducive to uncontrolled growth and tumor initiation
Less supported by current evidence, but not ruled out
PFOA can activate a cellular alarm system that releases inflammatory signals, leading to persistent low-grade inflammation that damages tissue and supports tumor growth.
PFOA is internalized by breast epithelial cells and induces lysosomal damage or ion flux
This triggers assembly of the NLRP3 inflammasome complex and activation of caspase-1
Caspase-1 cleaves pro-inflammatory cytokines into active forms, including IL-1β and IL-18
Sustained cytokine release recruits immune cells and disrupts epithelial structure, fostering a pro-tumorigenic environment
Evidence from Studies
Supporting (1)
Community contributions welcome
Perfluoroalkyl and polyfluoroalkyl substances and Cancer risk: results from a dose-response Meta-analysis
Contradicting (0)
Community contributions welcome
Gold Standard Evidence Needed
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