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Aflatoxin B1 is toxic to porcine oocyte maturation.
- Source :
-
Mutagenesis [Mutagenesis] 2015 Jul; Vol. 30 (4), pp. 527-35. Date of Electronic Publication: 2015 Mar 16. - Publication Year :
- 2015
-
Abstract
- As a toxic secondary metabolite of Aspergillus species, Aflatoxin B1 (AFB1) is a major food and feed contaminant in tropical and sub-tropical regions with high temperature and humidity. It has been reported to be toxic to the female reproductive system in laboratory and domestic animals. In the present study, the influence of acute exposure to AFB1 (10 and 50 μM, 44h) on porcine oocyte maturation and its possible mechanism were investigated. The maturation rates of oocytes decreased significantly in the presence of 50 μM of AFB1. Cell cycle analysis showed that most oocytes were arrested at germinal vesicle breakdown or meosis I stage. However, actin assembly, spindle structure and chromosome alignment were not disrupted after exposure to 50 μM AFB1. Further study showed that DNA methylation levels increased in treated oocytes (50 μM). Histone methylation levels were also analysed after treatment (50 μM): H3K27me3 and H3K4me2 levels decreased, whereas H3K9me3 level increased, indicating that epigenetic modification was affected. AFB1 treatment (50 μM) also induced oxidative stress and further led to autophagy, as shown by accumulation of reactive oxygen species, up-regulated LC3 protein expression and increased mRNA levels of ATG3, ATG5 and ATG7. Annexin V-FITC staining assay revealed that AFB1 treatment (50 μM) resulted in oocyte early apoptosis, which was confirmed by increased Bak, Bax, Bcl-xl mRNA levels. Collectively, our results suggest that AFB1 disrupts porcine oocyte maturation through changing epigenetic modifications as well as inducing oxidative stress, excessive autophagy and apoptosis.<br /> (© The Author 2015. Published by Oxford University Press on behalf of the UK Environmental Mutagen Society. All rights reserved. For permissions, please e-mail: journals.permissions@oup.com.)
- Subjects :
- Animals
Autophagy
Blotting, Western
Cell Proliferation
Cells, Cultured
DNA Methylation drug effects
Epigenomics
Female
Fluorescent Antibody Technique
Oocytes drug effects
Oocytes metabolism
RNA, Messenger genetics
Real-Time Polymerase Chain Reaction
Reverse Transcriptase Polymerase Chain Reaction
Swine
Aflatoxin B1 toxicity
Apoptosis genetics
Cell Cycle genetics
Oocytes cytology
Oogenesis drug effects
Oxidative Stress drug effects
Reactive Oxygen Species metabolism
Subjects
Details
- Language :
- English
- ISSN :
- 1464-3804
- Volume :
- 30
- Issue :
- 4
- Database :
- MEDLINE
- Journal :
- Mutagenesis
- Publication Type :
- Academic Journal
- Accession number :
- 25778688
- Full Text :
- https://doi.org/10.1093/mutage/gev015