Bisphenol A (BPA) is known as an endocrine disruptor compound and commonly found in food-packaging plastics and in aquatic environment. It is scientifically concerned that BPA may causes significant health risks to human and aquatic animals. In fact, most of scientific studies have been conducted with BPA-acute toxicity in early stages of animal development, while far lesser researches have been focused on BPA-chronic toxicity in adults. This study was to investigate the chronic effects of environmental 1, 10 and 100 µg/L BPA to four-week-old zebrafishes (Danio rerio) after 60 days of exposure in terms of changing of body morphology, hepatocyte morphology and the transcriptional expression of biomarker gene for lipid metabolism. As a result, significant effects were found in: 1/ the increase of body weight, but not body length; 2/ the increase in the number of vacuolated hepatocytes corresponding to relatively higher glycogen and lipid content; 3/ shifting hepatocyte morphology to basophilic cytoplasm and cytoplasmic and/or nuclear enlargement, but not inflammation signs (macrophages, granuloma, fibrosis/cirrhosis); 4/ the decrease of mRNA level of PPARγ and C/EBPα genes in liver. Our study here indicates that the exposure to μg/L range concentration of BPA leads to adipogensis in adult zebrafishes.
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