Journal
ENVIRONMENTAL POLLUTION
Volume 266, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2020.115288
Keywords
Monobutyl phthalate; Zebrafish; Gills damage; Energy metabolism
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Funding
- Supporting Plan for Training Talents with Special Funds for the Development of Local Colleges and Universities by Central Finance
- National Natural Science Foundation of China [41877128]
- Second Batch of National 10,000 Person Plan in 2016
- National Natural Science Fund for Distinguished Young Scholars [41625002]
- Heilongjiang Provincial Key Laboratory of Soil Protection and Remediation
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Monobutyl phthalate (MBP) is a primary metabolite of an environmental endocrine disruptor dibutyl phthalate (DBP), which poses a potential threat to living organisms. In this research, the acute toxicity of MBP on energy metabolism in zebrafish gills was studied. Transmission electron microscopy (TEM) results show that 10 mg L-1 MBP can induce mitochondrial structural damage of chloride cells after 96 h of continuous exposure. The activity of ion ATPase and the expression level of oxidative phosphorylation-related genes suggest that MBP interferes with ATP synthesis and ion transport. Further leading to a decrease in mitochondrial membrane potential (MMP) and cell viability, thereby mediating early-stage cell apoptosis. Through a comprehensive analysis of principal component analysis (PCA) and integrated biomarker response (IBR) scores, atp5al, a subunit of mitochondrial ATP synthase, is mainly inhibited by MBP, followed by genes encoding ion ATPase (atp1b2 and atp2b1). Importantly, MBP inhibits aerobic metabolism by inhibiting the key enzyme malate dehydrogenase (MDH) in the TCA cycle, forcing zebrafish to maintain ATP supply by enhancing anaerobic metabolism. (C) 2020 Elsevier Ltd. All rights reserved.
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