Can mycophenolic acid and zearalenone contribute to immune dysregulation, oxidative stress, and mitochondrial strain?

Mycophenolic acid (MPA) and zearalenone (ZEN) are both fungal metabolites, but they have importantly different exposure contexts: MPA is a clinically used immunosuppressive drug, whereas ZEN is a dietary Fusarium mycotoxin.

Clinical and immune evidence

• MPA: Its immune effects are firmly established. By selectively inhibiting inosine monophosphate dehydrogenase (IMPDH), MPA restricts guanine-nucleotide synthesis needed for activated T- and B-cell proliferation. Consequently, immune dysregulation/immunosuppression is an expected, exposure-dependent pharmacologic effect at therapeutic doses.
• ZEN: Experimental systems show altered immune-cell viability and proliferation, inflammatory signaling, and cytokine production. Effects can be stimulatory or suppressive depending on dose and model. Human urinary α- and β-zearalenol biomarker studies confirm recent dietary exposure, but do not establish immune consequences at usual exposure levels.

Oxidative, mitochondrial, and endocrine mechanisms

• MPA: Caco-2 and mouse studies link MPA with mitochondrial reactive oxygen species (ROS), apoptosis, epithelial-barrier injury, and cellular damage. These findings support oxidative and mitochondrial strain as plausible mechanisms, but not as established generalized human outcomes.
• ZEN: Cell and animal studies consistently report ROS generation, impaired antioxidant defenses, lipid peroxidation, decreased mitochondrial membrane potential, structural mitochondrial injury, and apoptosis. ZEN and its metabolites also act as human estrogen-receptor-α agonists, providing an additional endocrine pathway that may influence tissue-specific responses.

Interpretation

• The claim that these compounds can contribute to immune, oxidative, and mitochondrial disturbances is scientifically supported, but the strength of evidence differs markedly by compound and exposure.
• Bottom line: Therapeutic MPA has well-established immunosuppressive effects. For MPA’s oxidative/mitochondrial effects and for ZEN’s immune, oxidative, and mitochondrial effects, evidence is principally mechanistic or from animal models; biomonitoring demonstrates ZEN exposure, not confirmed clinical injury from typical dietary exposure.