Mycotoxins Profile (Urinary)

Aflatoxins are mycotoxins produced principally by Aspergillus flavus and Aspergillus parasiticus, contaminating stored grains, nuts, and damp building materials. After exposure they are metabolised hepatically, with metabolites excreted in urine, where they serve as exposure markers. Aflatoxin B1 is among the most studied for its hepatotoxic and genotoxic potential.

Urinary aflatoxin metabolites are used as markers of recent or ongoing exposure to Aspergillus-derived toxins. In an environmental-illness context, detection supports a history of mould or contaminated-food exposure. Interpretation requires correlation with exposure history and clinical presentation rather than treating any detection as diagnostic of a disease state.

Ochratoxin A is produced by Aspergillus and Penicillium species and is found in contaminated grains, coffee, dried fruit, and water-damaged environments. It has a long half-life owing to enterohepatic recirculation and plasma protein binding, and is excreted renally. It is nephrotoxic in animal models and a focus of environmental-exposure assessment.

Urinary OTA reflects exposure to Aspergillus- and Penicillium-derived toxin and is among the most commonly detected analytes in mould-exposure panels. Detection is interpreted as evidence of exposure burden in the context of compatible history; it is not, on its own, a diagnosis of a defined clinical syndrome.

Macrocyclic trichothecenes are produced predominantly by Stachybotrys chartarum (black mould) and related species in water-damaged buildings. They are potent inhibitors of protein synthesis and are the toxins most associated in the literature with damp-building exposure. They are excreted in urine following exposure.

Detection of macrocyclic trichothecenes is used as a marker of Stachybotrys-type exposure characteristic of water-damaged indoor environments. As with the other analytes, results are interpreted alongside exposure history and symptoms rather than as standalone diagnostic findings.

Gliotoxin is produced chiefly by Aspergillus fumigatus and has recognised immunosuppressive properties in experimental models, including effects on phagocyte function. It is excreted in urine and is included in environmental-exposure panels as a marker of Aspergillus burden.

Urinary gliotoxin is interpreted as a marker of Aspergillus fumigatus exposure. Its immunomodulatory profile in laboratory studies is often cited in the integrative literature, though clinical correlation in humans is not firmly established and detection should be read as an exposure signal.

Zearalenone is produced by Fusarium species and contaminates cereal crops. It is structurally oestrogenic and can bind oestrogen receptors, which underlies interest in its endocrine effects. It undergoes hepatic metabolism and renal excretion.

Urinary zearalenone reflects Fusarium-derived exposure, frequently dietary in origin. Because of its oestrogenic activity, it is of interest where hormone-related symptoms accompany an exposure history, though detection alone does not establish a causal clinical effect.

Sterigmatocystin is a precursor in the aflatoxin biosynthetic pathway, produced by Aspergillus species and found in water-damaged buildings and stored foods. It is structurally related to the aflatoxins and is excreted renally following exposure.

Detection of sterigmatocystin indicates Aspergillus-related exposure and is included to broaden the panel's coverage of Aspergillus-derived toxins. Interpretation follows the same exposure-marker logic as the other analytes.