Okadaic acid: more than a diarrheic toxin

Area of Science:

• Marine Toxinology
• Molecular Toxicology
• Food Safety

Background:

• Okadaic acid (OA) is a prevalent marine toxin accumulated by seafood, causing diarrheic shellfish poisoning (DSP) in humans.
• OA is a potent inhibitor of protein phosphatases and a tumor promoter, with documented effects beyond gastrointestinal illness.
• Recent research indicates OA's potential to induce DNA damage, cellular alterations, and impact neurological, immune, and developmental systems.

Purpose of the Study:

• To compile and review existing studies on Okadaic acid (OA) toxicity.
• To clarify OA's role beyond DSP, including its cellular and molecular effects.
• To emphasize the importance of biomonitoring OA and reassessing food safety standards.

Main Methods:

• Literature review and compilation of studies on Okadaic acid (OA).
• Analysis of toxicological data from various experimental models.
• Synthesis of evidence on OA's effects on cellular and molecular pathways.

Main Results:

• Okadaic acid (OA) is confirmed as a DSP toxin but also exhibits significant toxicity at cellular and molecular levels.
• Evidence suggests OA induces DNA damage, affects cellular components, and impacts the nervous and immune systems.
• Tumor promotion and adverse effects on embryonic development have been reported in animal studies.

Conclusions:

• Okadaic acid (OA) possesses significant toxicity beyond its role in DSP, affecting cellular integrity and potentially promoting tumors.
• The documented cellular and molecular effects of OA necessitate a re-evaluation of current regulatory limits for OA in food.
• Further research into OA's mechanisms, toxicokinetics, and long-term health impacts is crucial for public health protection.