Low level of Ochratoxin A enhances Aflatoxin B1 Induced Cytotoxicity and Lipid Peroxydation in Both Human Intestinal (Caco-2) and Hepatoma (HepG2) Cells Lines
International Journal of Nutrition and Food Sciences
Volume 2, Issue 6, November 2013, Pages: 294-300
Received: Oct. 1, 2013; Published: Oct. 30, 2013
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Authors
Kouadio James Halbin, Dept. Biochemistry and Microbiology, UFR Agroferesterie, University of Jean L. GUEDE, DALOA, Côte d’Ivoire; Dept. of Nutrition and Food Safety, UFR STA, Nangui Abrogoua University 02 BP 801 Abidjan 02, Côte d’Ivoire
Brou Kouakou, Dept. of Nutrition and Food Safety, UFR STA, Nangui Abrogoua University 02 BP 801 Abidjan 02, Côte d’Ivoire
Gnakri Dago, Dept. Biochemistry and Microbiology, UFR Agroferesterie, University of Jean L. GUEDE, DALOA, Côte d’Ivoire
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Abstract
Aflatoxin B1 (AFB1) and ochratoxin A (OTA) are contaminants which co-occurred in the same food such as cereals. The few studies performed on their interactive effect had revealed additive or antagonistic cytotoxic effect according to cells endpoints and concentrations of both mycotoxins. The aim of the present study was to investigate in a possible influence of very low level of ochratoxin A in aflatoxin B1 toxic action regarding cellular endpoints such as malonedialdehyde (MDA) production and cells viability as evaluated by lysosome and mitochondria integrities and cell lactate dehydrogenase (LDH) leakage. OTA (20nM) and AFB1 were tested in combination in both human intestinal (Caco-2) and hepatoma (HepG2) cells lines. As results, OTA alone tested at 20nM was not cytotoxic and did not induce MDA production in both Caco-2 and HepG2 cells line. Interestingly, combined to AFB1 (10µM), OTA enhanced markedly AFB1 cytotoxic effect. OTA significantly increased cell lysosomes damage induced by AFB1 from 24% to 38% (+14%) and from 28% to 43% (+15%) respectively in Caco-2 and HepG2 cells line (p<0.05). Similarly, OTA enhanced inhibition of mitochondria succinate dehydrogenase activity induced by AFB1 until to +15% and +6% respectively in Caco-2 and HepG2 cells line (p<0.05). On cell necrosis marker, the mixture of OTA and AFB1induced more LDH leakage when compared to AFB1 alone with increase of +14% and +12% respectively in Caco-2 and HepG2 cells line (p<0.05). Finally, on MDA production, AFB1 + OTA induced more intensively MDA production when compared to AFB1 alone with +49% and +110% of increasing in both Caco-2 and HepG2 cells line (p<0.01). Taken together, our results suggested that combined AFB1 and OTA induced all the toxicities observed with the mycotoxins separately but more intensively suggesting synergistic or potentiating effect. Moreover, AFB1 or its association with OTA had been found very potent in human hepatic cells HepG2 in necrosis induction but especially in lipids oxidative damage confirming oxidative stress as one of keys pathways in toxic action of AFB1.
Keywords
Aflatoxin B1, Ochratoxin A, Low Level, Interactive Effect, Influence
To cite this article
Kouadio James Halbin, Brou Kouakou, Gnakri Dago, Low level of Ochratoxin A enhances Aflatoxin B1 Induced Cytotoxicity and Lipid Peroxydation in Both Human Intestinal (Caco-2) and Hepatoma (HepG2) Cells Lines, International Journal of Nutrition and Food Sciences. Vol. 2, No. 6, 2013, pp. 294-300. doi: 10.11648/j.ijnfs.20130206.15
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