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Artículo

The aflatoxin B1-fumonisin B1 toxicity in BRL-3A hepatocytes is associated to induction of cytochrome P450 activity and arachidonic acid metabolism

Mary, Verónica SofíaIcon ; Arias, Silvina LorenaIcon ; Otaiza González, Santiago NicolásIcon ; Velez, Pilar Andrea; Rubinstein, Héctor Ramón; Theumer, Martín GustavoIcon
Fecha de publicación: 06/2017
Editorial: John Wiley & Sons Inc
Revista: Environmental Toxicology
ISSN: 1520-4081
e-ISSN: 1522-7278
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Otras Ciencias Biológicas

Resumen

Human oral exposure to aflatoxin B1 (AFB1) and fumonisin B1 (FB1) is associated with increased hepatocellular carcinoma. Although evidence suggested interactive AFB1–FB1 hepatotoxicity, the underlying mechanisms remain mostly unidentified. This work was aimed at evaluating the possible AFB1–FB1 interplay to induce genetic and cell cycle toxicities in BRL-3A rat hepatocytes, reactive oxygen species (ROS) involvement, and the AFB1 metabolizing pathways cytochrome P450 (CYP) and arachidonic acid (ArAc) metabolism as ROS contributors. Flow cytometry of stained BRL-3A hepatocytes was used to study the cell cycle (propidium iodide), ROS intracellular production (DCFH-DA, HE, DAF-2 DA), and phospholipase A activity (staining with bis-BODIPY FL C11-PC). The CYP1A activity was assessed by the 7-ethoxyresorufin-O-deethylase (EROD) assay. Despite a 48-h exposure to FB1 (30 μM) not being genotoxic, the AFB1 (20 μM)-induced micronucleus frequency was overcome by the AFB1–FB1 mixture (MIX), presumably showing toxin interaction. The mycotoxins blocked G1/S-phase, but only MIX caused cell death. Overall, the oxidative stress led these alterations as the pretreatment with N-acetyl-l-cysteine reduced such toxic effects. While AFB1 had a major input to the MIX pro-oxidant activity, with CYP and ArAc metabolism being ROS contributors, these pathways were not involved in the FB1-elicited weak oxidative stress. The MIX-induced micronucleus frequency in N-acetyl-l-cysteine pretreated cells was greater than that caused by AFB1 without antioxidants, suggesting enhanced AFB1 direct genotoxicity probably owing to the higher CYP activity and ArAc metabolism found in MIX. The metabolic pathways modulation by AFB1–FB1 mixtures could raise its hepatocarcinogenic properties.
Palabras clave: Cyp1a , Genotoxicity , Mycotoxin Mixture , Oxidative Stress , Phospholipase A
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info:eu-repo/semantics/openAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)
Identificadores
URI: http://hdl.handle.net/11336/48782
URL: https://onlinelibrary.wiley.com/doi/abs/10.1002/tox.22395
DOI: http://dx.doi.org/10.1002/tox.22395
Colecciones
Articulos(CIBICI)
Articulos de CENTRO DE INV.EN BIOQUI.CLINICA E INMUNOLOGIA
Citación
Mary, Verónica Sofía; Arias, Silvina Lorena; Otaiza González, Santiago Nicolás; Velez, Pilar Andrea; Rubinstein, Héctor Ramón; et al.; The aflatoxin B1-fumonisin B1 toxicity in BRL-3A hepatocytes is associated to induction of cytochrome P450 activity and arachidonic acid metabolism; John Wiley & Sons Inc; Environmental Toxicology; 32; 6; 6-2017; 1711-1724
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