Ochratoxin A carcinogenicity involves a complex network of epigenetic mechanisms

Area of Science:

• Food toxicology
• Molecular toxicology
• Epigenetics

Background:

• Ochratoxin A (OTA) is a prevalent mycotoxin found in various food products.
• Human data on OTA's food safety is limited, necessitating reliance on animal studies.
• Renal toxicity and carcinogenicity are key concerns for OTA in food safety.

Purpose of the Study:

• To review the epigenetic mechanisms of Ochratoxin A (OTA).
• To discuss the toxicological relevance of OTA's epigenetic effects.
• To improve the use of animal data for OTA risk assessment.

Main Methods:

• Literature review of epigenetic cellular effects of OTA.
• Analysis of potential toxicological relevance of these mechanisms.
• Discussion of OTA's mechanism of action in relation to carcinogenicity.

Main Results:

• OTA's effects are likely mediated by a network of interacting epigenetic mechanisms.
• Key mechanisms include protein synthesis inhibition, oxidative stress, and cell signaling pathway activation.
• These mechanisms are proposed to be responsible for OTA-induced carcinogenicity.

Conclusions:

• OTA's carcinogenicity is unlikely due to a single mechanism.
• A combination of epigenetic effects, including protein synthesis inhibition and oxidative stress, contributes to OTA's carcinogenic potential.
• The proposed epigenetic mechanisms are likely thresholded, impacting food safety risk assessment.