Exposure to diclofenac alters thyroid hormone levels and transcription of genes involved in the hypothalamic–pituitary–thyroid axis in zebrafish embryos/larvae
2022
Wang, Hongkai | Dong, Feilong | Zhao, Yixin | Fu, Shirong | Zhao, Haocheng | Liu, Shangshu | Zhang, Weini | Hu, Fengxiao
Diclofenac (DCF), one of typical non-steroidal anti-inflammatory drugs (NSAIDs), has been frequently detected in various environmental media. Nevertheless，the potential endocrine disrupting effects of DCF on fish were poorly understood. In the present study, zebrafish embryos/larvae were used as a model to evaluate the adverse effects of DCF on development and thyroid system. The results demonstrated that DCF only significantly decreased the heart rate at 72 h post-fertilization (hpf), exhibiting limited influence on the embryonic development of zebrafish. Treatment with DCF significantly reduced whole-body thyroxine (T4) levels, and changed transcriptional levels of several genes related to the hypothalamic-pituitary-thyroid (HPT) axis. These findings provide important information regarding to the mechanisms of DCF-induced developmental toxicity and thyroid disruption in fish.
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