Can mycotoxins worsen autoimmune activity?

Mycotoxins—toxic secondary metabolites produced by certain molds—frequently emerge in discussions surrounding environmental triggers of systemic inflammation and immune-mediated disorders.

Inflammatory and immune mechanisms

• Molecular activation: Exposure to major mycotoxins, such as deoxynivalenol, aflatoxins, and ochratoxin A, triggers cellular and ribotoxic stress. This process activates the NF-κB pathway alongside key stress kinases like p38 and JNK.
• Cytokine skewing: This activation results in the robust upregulation of pro-inflammatory cytokines, including IL-1β, IL-6, and TNF-α. This cytokine environment promotes the polarization of Th17 cells—which are highly implicated in tissue damage—while simultaneously suppressing regulatory T-cell (Treg) function.
• Barrier disruption: Mycotoxins compromise epithelial barriers, particularly in the gastrointestinal tract, by damaging tight junction proteins. This increased permeability allows the translocation of systemic immunogens, such as lipopolysaccharides (LPS), further driving systemic inflammatory tone.

Autoimmune progression and limitations

• Autoimmune activity: In vitro and animal models show that mycotoxin-induced oxidative stress, cellular injury, and the subsequent release of intracellular self-antigens can foster autoantibody production and exacerbate tissue pathology.
• Evidence limitations: While these cellular pathways are highly coherent, direct clinical and epidemiological evidence linking mycotoxin exposure to the development or progression of human autoimmune diseases is limited. Current science views these toxins as potential environmental modifiers that may exacerbate baseline immune fragility in genetically susceptible individuals, rather than primary causative agents.

Bottom line

• Mycotoxins are proven promoters of systemic inflammation, Th17 immune skewing, and epithelial barrier disruption. While these pathways make the worsening of autoimmune activity highly plausible, direct clinical evidence establishing a causal link in human populations remains limited, and further prospective research is needed.