Ochratoxins are metabolites of Aspergillus, Fusarium, and Penicillium species. The most commonly implicated species are A. ochraceus and ostianus, P. viridicatum, griseofulvum and possibly solitum and Eurotium amstelodami (Ochratoxin, 2002).

Recent evidence shows that these mycotoxins are present in a variety of foods (cereals, pork, poultry, coffee, beer, wine, grape juice and milk). Analyses of these food products demonstrated that Ochratoxins are also produced by P. vercucosum and A. niger and carbonarius. (Abarca et al, 2001); Pitt, 2000; Bukelskiene et al, 2006).

There are three generally recognized Ochratoxins, designated A, B and C.

Ochratoxin A (OTA) is chlorinated and is the most toxic, followed by OTB and OTC. Chemically, they are described as 3,4-dihydro-methylisocoumarin derivative linked with an amide bond to the amino group of L-b-phenylalanine (Hussein et al, 2001).

The role and risk assessment of OTA in animal and human disease has been reviewed. The estimated tolerable dosage in humans was estimated at 0.2 to 4.2 ng/kg body weight based upon NTP carcinogenicity study in rats. OTA is mutagenic, immunosuppressive and teratogenic in several species of animals. Its target organs are the kidneys (nephropathy) and the developing nervous system (Kuiper-Goodman & Scott, 1989; Krogh, 1992).

Following intravenous administration, OTA is eliminated with a half-life from body in vervet monkeys in 19-21 days (Stander et al, 2001). There is no reason to suspect that the elimination half-life would be significantly different in humans.

Ochratoxin A has a number of toxic effects in animals. It is immunosuppressive, teratogenic, carcinogenic, nephrotoxic and neurotoxic. It inhibits protein synthesis, followed by inhibition of RNA synthesis. OTA lowers the level of phosphoenolpyruvate carboxykinase, a key enzyme in gluconeogenesis. The toxin also enhances lipid peroxidation both in vivo and in vitro, which is probably responsible for its adverse affects on mitochondrial function. OTA also forms DNA adducts in the kidney, liver and spleen that results in single-strand breaks (OTA, 2002).

There is inadequate evidence that OTA is carcinogenic in humans. However, there is sufficient evidence in experimental animals. Overall, OTA is possibly carcinogenic to humans and is a Group 2B carcinogen.

Balkan endemic neuropathy (BEN) associated with OTA occurs in Europe (Bulgaria, Croatia, Turkey, Egypt, and Yugoslavia) where OTA is relatively high in the diet. Individuals with BEN were surveyed for the presence of urinary tract tumors. The incidence of tumors in the urinary system was elevated in both men and women. Furthermore, the observations suggested that individuals with urinary tract tumors had elevated levels of OTA in the blood and urine. Approximately one-third of patients dying from BEN have papillomas and/or carcinomas of the renal pelvis, ureter or bladder (Ochratoxin, 2002; Radovanovic et al, 1991;, Wafa et al, 1997; Radic et al, 1997; Ozcelik et al, 2001; Pfohl-Leszkowicz et al, 2002).

Recently, it has been suggested that OTA can cause testicular cancer in humans (Schwartz, 2002). The hypothesis that consumption of foods contaminated with OTA causes testicular cancer was tested. The incidence of rates of testicular cancer in 20 countries was significantly correlated with the per-capita consumption of coffee and pig meat.

Schwartz concluded: "Thus, OTA is a biologically plausible cause of testicular cancer. Future epidemiologic studies of testicular cancer should focus on the consumption of OTA-containing foods such as cereals, pork products, milk and coffee by mothers and their male children."

- Several lines of experimental observations demonstrate that OTA effects mitochondrial function and causes mitochondrial damage. The reader is referred to Wallace (1997) for background information on mitochondrial DNA in aging and disease in chicks and quail.

- OTA causes pathological changes in the ultra structure of mitochondria in proximal convoluted tubules and glomeruli of kidneys and liver. These changes include abnormal shapes, enlarged mitochondrial matrix and excessive lipid droplets (Brown et al, 1986; Dwivedi et al, 1984; Maxwell et al, 1981).

- OTA causes oxidative stress and production of free radicals in rat hepatocytes and proximal tubules of the kidneys. Lipid peroxidation preceded cell death in cells of the proximal tubules (Gautier et al, 2002; Hoehler et al, 1997).

- OTA is a nonoompetitive inhibitor of both succinate-cytochrome C reductase and succi nate dehydrogenase. It impairs mitochondrial respiration and oxidative phorphorylation through impairment of the mitochondrial membrane and by inhibition of suoci nature-supported electron transfer activities of the respiratory chain (Wei et al, 1985). It also inhibits glutamateimalate substrate respiration of Site I and causes lipid peroxidation leading to cell death (Alec et al, 1991.

- Another mechanism appears to be the activation of mitochondrial NHE interfering with Ca2+ homeostasis. This induces extracellular acidification leading to cell death in renal proximal tubules (Eder et al, 2000; Rodeheaver & Schnellman, 1993).

- OTA is mutagenic and carcinogenic (Ochratoxin A, 2002). It causes DNA single-stranded breaks and DNA adducts in the DNA of spleen, liver and kidney in OTA treated mice (Pfohl-Leszkowicz et al, 1991; Creppy et al, 1985).

- OTA inhibits bacterial, yeast and liver phenylalanyl-tRNA synthetases. The inhibition is competitive to phenylalanine and is reversed by an excess of this amino acid. It also inhibits phenylalanine hydroxylase and lowers the concentration of phosphoenolpyruvate carboxykinase. It appears that an inhibition of protein and RNA synthesis is the end result of these toxic effects (Dirheimer & Creppy, 1991). Inhibition of protein and RNA synthesis is considered one of the toxic effects of OTA (Ochratoxin A, 2002).

- OTA induces apoptosis (programmed cell death) in a variety of cell types in vivo and in vitro. The mechanisms include caspase 3 activation, mitogen-activated protein kinases (MAPK) family, and c-jun amino-terminal kinase (JNK). The apoptosis is also mediated through cellular processes involved in the degradation of DNA. Finally, the mechanisms leading to cell death may be inhibited by various antioxidants (Atroshi et al, 2000; Gekle et al, 2000; Schwerdt et al, 1999; Seegers et al, 1994).

- OTA is nephrotoxic in all animals studied and has been implicated in the etiology of Balkan endemic nephropathy (BEN) (Ochratoxin A, 2002). The clinical picture of BEN is that of a slowly progressing tubulo-interstitial chronic nephritis and urethral tumors are frequent, occurring in 2-47 % of cases (Radonic & Radosevic, 1992). The proximal tubule cells are the primary target for OTA toxicity. BEN is an end-stage renal disease.

- Epidemiological investigations have shown that BEN and dietary exposure are associated, leading to the conclusion that OTA is one of the causative agents in the identification of DNA-ochratoxin A adducts in urinary tract tumors in patients from areas with BEN add support to this conclusion (Puntaric et al, 2002; Stoev et al, 1998; Pfohl-Leszkowicz et al, 1993b; Mikolov et al, 1996).

What does it mean if your Ochratoxin A result is too high?

What Does an Elevated Ochratoxin A (OTA) Result Mean?

An elevated OTA level in your test suggests recent or ongoing exposure to this mycotoxin through:

  • Contaminated food (especially grains, coffee, dried fruit, or spices)

  • Mold-contaminated indoor environments

  • Exposure to moldy feed or hay (for individuals living on farms or with livestock)

This may or may not mean you have symptoms right now, but chronic exposure can increase your risk for:

  • Kidney stress or damage

  • Immune dysfunction

  • Hormonal imbalance

  • Fatigue, headaches, or increased infections

  • Long-term risk of urinary tract tumors and neurological issues

What Should You Do Next?

1. Identify and Eliminate the Source

  • Assess your diet: Reduce intake of stored grains, coffee, wine, and dried fruits unless they are certified mold-free.

  • Inspect your living or working environment: Water-damaged buildings, musty odors, or visible mold may indicate mold contamination.

  • Consider environmental testing for airborne or surface mold, especially if multiple family members or pets have symptoms.

2. Support Detoxification

  • Stay hydrated to help your kidneys flush out toxins.

  • Consider mycotoxin binders (such as activated charcoal, bentonite clay, or cholestyramine), but only under medical guidance.

  • Boost antioxidant intake: Vitamins A, C, and E, selenium, and glutathione may help reduce oxidative stress from OTA.

  • Liver and kidney support: Milk thistle, NAC, and dandelion root may aid in detox, but again should be used under guidance.

3. Retest Over Time

  • If your levels were only slightly elevated or equivocal, retesting in a few months can help confirm whether exposure is ongoing or resolving.

4. Consult a Healthcare Professional

  • Especially if you're immunocompromised, pregnant, or experiencing unexplained symptoms. An integrative or environmental medicine practitioner may be especially helpful.

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