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).
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OTA is a mycotoxin produced by species of Eurotium, Aspergillus, Fusarium and Penicillium. It is found in many food crops, including cereals, coffee, cocoa and dried vine fruits.
OTA is mutagenic, carcinogenic, teratogenic and immunosuppressive in a variety of animal species. It has been implicated in the etiology of BEN and urinary tract tumors in humans.
It is a mitochondrial poison causing mitochondrial damage, oxidative burst, lipid peroxidation and interferes with oxidative phosphorylation. In addition, OTA increases apoptosis in several cell types.
The UK’s Joint Expert Committee on Food Additives has set a provisional tolerable dietary intake (TDI) of 0.2 mg/kg body weight per week.
OTA has been found in human and cow milk samples in European countries (Ochratoxin A, 2002).
In Norway, the concentrations found in human and cow milk were sufficient to suggest that the TDI of 5 ng/kg body/day would be exceeded in small children who consume large quantities of milk (Skaug et al, 1990, 1999, 2001).
Airborne exposure to OTA can occur, adding to the daily intake of the mycotoxin via the respiratory tract. Thus, OTA has been demonstrated in dust and fungal conidia in samples taken from cow sheds.
Furthermore, OTA was detected in dust samples from the heating ducts of a house where animals showed signs of ochratoxicosis (Skaug et al, 2000; Richard, 1999).
Finally, Ochratoxin A has been found in bulk samples of a water-damaged home. In addition, the occupants and the household dog had Ochratoxin A in urine and nasal secretions (Thrasher, et al, 2010).
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Anthony
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I have been using Healthmatters.io since 2021. I travel all over the world and use different doctors and health facilities. This site has allowed me to consolidate all my various test results over 14 years in one place. And every doctor that I show this to has been impressed. Because with any health professional I talk to, I can pull up historical results in seconds. It is invaluable. Even going back to the same doctor, they usually do not have the historical results from their facility in a graph format. That has been very helpful.
Karin
Advanced Plan Member since 2020
What fantastic service and great, easy-to-follow layouts! I love your website; it makes it so helpful to see patterns in my health data. It's truly a pleasure to use. I only wish the NHS was as organized and quick as Healthmatters.io. You've set a new standard for health tracking!
Paul
Healthmatters Pro Member since 2024
As a PRO member and medical practitioner, Healthmatters.io has been an invaluable tool for tracking my clients' data. The layout is intuitive, making it easy to monitor trends and spot patterns over time. The ability to customize reports and charts helps me present information clearly to my clients, improving communication and outcomes. It's streamlined my workflow, saving me time and providing insights at a glance. Highly recommended for any practitioner looking for a comprehensive and user-friendly solution to track patient labs!
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For our professional users, Healthmatters provides intuitive tools that not only streamline analysis but also save valuable time when delving into your client's lab report history.
Healthmatters.io personal account provides in-depth research on 4000+ biomarkers, including information and suggestions for test panels such as, but not limited to:
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If you are still determining whether Healthmatters support your lab results, the rule is that if you can test it, you can upload it to Healthmatters.
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It's as simple as this: if you can get a test done, you can upload it to Healthmatters and we can interpret results from any lab out there. If laboratories can analyze it, we can interpret it.
If you’re on the hunt for a specific biomarker, contact us and we'll add it to our database. Anything from blood, urine, saliva, or stool can be uploaded, understood, and tracked with your Healthmatters account.
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We’ve crafted multiple ways for you to navigate your data, whether you're glancing at a single report or delving into your historical test reports.
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Yes, you can. When entering values for the biomarker, you will see an "Edit Range" button. Click this button, and you'll have the option to enter a custom range.
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