期刊
TOXINS
卷 12, 期 5, 页码 -出版社
MDPI
DOI: 10.3390/toxins12050282
关键词
microcystin-LR; hypothalamic-pituitary-interrenal axis; cortisol; liver glucose metabolism; zebrafish
资金
- National Natural Science Foundation of China [31670521]
- Fundamental Research Funds for the Central Universities [2662015PY119]
- National Training Program of Innovation and Entrepreneurship for Undergraduates [201810504093]
- Earmarked Fund for China Agriculture Research System [CARS-45]
There is growing evidence that microcystin-LR (MC-LR) is a new endocrine disruptor, whereas the impacts of persistent exposure to MC-LR on the hypothalamic-pituitary-interrenal (HPI) axis and health hazards thereafter have not been investigated. In this work, adult male zebrafish (Danio rerio) were immersed into MC-LR solutions at concentrations of 0, 1, 5 and 25 mu g/L for 30 d, respectively. The results showed that persistent MC-LR exposure caused an extensive upregulation of HPI-axis genes but an inhibition of brain nuclear receptors (grandmr), which finally increased serum cortisol levels. Furthermore, the decreased expression of hepaticgrmight partly be responsible for the strong inhibition on the expression of downstream genes involved in glucose metabolic enzymes, including gluconeogenesis-related genes (pepck,fbp1a,g6pca), glycogenolysis-related gene (pyg), glycolysis-related genes (gk,pfk1b,pk) and glycogenesis-related gene (gys2). These findings are in accordance with the decline in serum glucose, indicating that long-term MC-LR exposure caused a lower production of glucose relative to glucose lysis. Our above results firstly establish the link between persistent MC-LR exposure and impaired glucose metabolism, suggesting that long-term MC-LR-mediated stress might threaten fish's health.
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