Toxicity of the Mycotoxin Deoxynivalenol on Early Cleavage of Mouse Embryos by Fluorescence Intensity Analysis

Abstract

Deoxynivalenol is a mycotoxin, produced by Fusarium from contaminated corn, wheat, and other grains, that induces multiple effects in humans and animals, including cytotoxic, genotoxic, immunotoxic, and carcinogenic effects. Recent studies show that deoxynivalenol also affects the reproductive system of mammals, including oocyte quality. However, the effects of deoxynivalenol on early embryonic development have not been reported. In this study, fluorescence intensity analysis was used to show that deoxynivalenol disrupted the first cleavage of the zygote. The high deoxynivalenol dose disturbed the movement of the pronucleus after fertilization, while the low deoxynivalenol dose caused aberrant spindle morphology during the metaphase of the first cleavage. Further analysis showed that the reactive oxygen species level increased in the deoxynivalenol-exposed two-cell embryos, indicating oxidative stress. Moreover, deoxynivalenol caused DNA damage in the embryos, as positive γH2A.X signals were detected in the nucleus. These events led to the early apoptosis of mouse embryos, which was confirmed by autophagy. Taken together, our study provides evidence for the toxicity of deoxynivalenol during early embryonic development in the mouse model.

Keywords: DNA damage; deoxynivalenol; embryo; intensity analysis; spindle.