Can mycotoxins like aflatoxin B1, nivalenol, and verrucarin J cause immune dysregulation and persistent fatigue?

Inflammatory mechanisms of mycotoxins

• Aflatoxin B1 (AFB1), nivalenol (NIV), and verrucarin J are potent cellular stressors. AFB1 activates NF-κB, MAPK, and the CMPK2-NLRP3 inflammasome axis, driving the secretion of pro-inflammatory cytokines such as TNF-α, IL-1β, and IL-6, along with the chemokine CCL20.
• Trichothecenes like NIV and verrucarin J disrupt translation by binding to ribosomes, causing ribosome collisions. This triggers the ZAKα-mediated ribotoxic stress response (RSR), which downstream activates p38/JNK MAPKs and couples directly to the NLRP1 inflammasome, leading to pyroptotic cell death and systemic inflammatory signaling.

Biological pathways driving fatigue

• Chronic systemic inflammation and elevated pro-inflammatory cytokines directly disrupt central nervous system homeostasis, contributing to the neuroinflammation frequently seen in chronic fatigue states.
• Beyond immune pathways, these mycotoxins act as mitochondrial toxins. They impair electron transport chain function, diminish cellular ATP production, and generate excessive reactive oxygen species (ROS).
• This dual impact—prolonged immune activation paired with severe mitochondrial dysfunction and energy depletion—directly underlies the development of profound, non-restorative fatigue and cognitive deficits that clinically mirror Myalgic Encephalomyelitis/Chronic Fatigue Syndrome (ME/CFS).
• While epidemiological studies consistently associate damp, mold-exposed environments with persistent fatigue, establishing tight, direct causal links in human populations is limited by confounding environmental factors and the lack of standardized diagnostic biomarkers.

Bottom line

• Strong scientific evidence supports the claim that mycotoxins like AFB1, nivalenol, and verrucarin J drive immune dysregulation and chronic inflammation through ZAKα, MAPK, and inflammasome pathways. This persistent immune activation, combined with mycotoxin-induced mitochondrial stress, serves as a biologically plausible and well-supported driver of chronic fatigue.