Sulforaphane inhibits CYP1A1 activity and promotes genotoxicity induced by 2,3,7,8-tetrachlorodibenzo-p-dioxin in vitro.
Level 5 - mechanism / opinion, no new human data
In vitro cell culture, yeast assay, and molecular docking bench study
PubMed 23566952 · doi:10.1016/j.taap.2013.03.024
What was done
The authors investigated the effects of sulforaphane on CYP1A1 activity and genotoxicity induced by 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD). They measured CYP1A1 activity in H4IIE cells, performed molecular docking against the aryl hydrocarbon receptor and CYP1A1, and tested DNA damage and cell viability in yeast cells exposed to TCDD and other genotoxic reagents.
What was found
Sulforaphane inhibited TCDD-induced CYP1A1 activity in H4IIE cells, with docking models indicating direct binding to the aryl hydrocarbon receptor and/or CYP1A1. However, sulforaphane promoted TCDD-induced DNA damage in yeast cells, decreased the viability of initiated yeast cells, and failed to prevent genotoxicity induced by other DNA-damaging agents. The abstract provides no quantitative metrics, concentrations, or effect sizes.
Why it matters
These findings suggest that sulforaphane, often considered a chemopreventive agent, may have conflicting or harmful interactions during exposure to certain persistent organic pollutants.
Limits
This was an in vitro cell culture and yeast model study with no human or animal data. The abstract provides no specific numerical values, exposure doses, or identification of the other genotoxic reagents tested.
Cited by
- supports Sulforaphane deactivates phase I biotransformation enzymes that convert procarcinogens into active carcinogens, such as heterocyclic amines from charred meat.