Abstract
Fungi and their mycotoxins are ubiquitous, contaminating the air we breathe and the food we eat on a daily basis. Mycotoxins are considered a natural and unavoidable contaminant of food crops. Anthropogenic climate change is anticipated to increase mycotoxin contamination. Although mycotoxins are too small to be seen by the naked eye, uncontrolled mycotoxins can cause gangrene, miscarriage, cancer, and death. Mycotoxins in low amounts stimulate an immune response from macrophages. Mycotoxins in high amounts shut down the immune response preventing an adequate defence. Fumigaclavine C reduces toll-like receptor 4 expression and tumor necrosis factor alpha. Aflatoxins are carcinogenic and have been linked to tumor formation in the colon, kidneys, liver, and lungs. Aflatoxin B1 is the strongest carcinogen of all the aflatoxins. Aflatoxin B1 is removed by macrophage autophagy and by extracellular traps. Ochratoxin A has been found to be nephrotoxic, teratogenic, carcinogenic, and immunotoxic. Ochratoxin A acts as a competitive inhibitor for phenylalanine-tRNA synthetase which halts protein synthesis. Ochratoxin A’s effects can be blocked by phenylalanine. Trichothecene mycotoxins are lethal enough to be utilized as biological chemical warfare agents, and they have been. Mycotoxins act synergistically with other mycotoxins, bacterial endotoxin, and virus causing a greater adverse effect than the sum of their individual effects. Synergy helps to explain the observed effects of damp building-related illness. Controlled amounts of specific mycotoxins can be clinically useful. Ergometrine has been used clinically to stimulate uterine contractions in order to induce childbirth. After child delivery, ergometrine can be used to help control bleeding via its vasoconstrictive action. Ergotamine has been used clinically to reduce pain associated with migraine headaches. The immunosuppressant activity of mycophenolic acid arises from its ability to reversibly inhibit the enzyme inosine 5′-monophosphate dehydrogenase thereby shutting down the biochemical de novo pathway which synthesizes guanine nucleotides. The immunosuppressive effects of mycophenolic acid have found utility in treating autoimmune diseases of rheumatoid arthritis and lupus nephritis. Mycophenolic acid helps prevent organ transplant rejection for kidney, heart, and liver recipients.
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Cleary, D. (2022). Effects of Mycotoxins on Macrophages and Their Possible Clinical Implications. In: Gupta, S., Pathak, Y.V. (eds) Macrophage Targeted Delivery Systems. Springer, Cham. https://doi.org/10.1007/978-3-030-84164-5_23
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