Acute nitrite exposure interferes with intestinal thyroid hormone homeostasis in grass carp (Ctenopharyngodon idellus)
文献类型： 外文期刊
作者： Liang, Xiao 1 ; Wang, Yin 1 ; Liu, Lu 1 ; Zhang, Xi 1 ; Li, Li 1 ; Tang, Rong 1 ; Li, Dapeng 1 ;
作者机构： 1.Huazhong Agr Univ, Coll Fisheries, Engn Res Ctr Green Dev Convent Aquat Biol Ind Yang, Hubei Prov Engn Lab Pond Aquaculture, Wuhan 430070, Peoples R China
2.Inst Hydrobiol, Zhejiang Acad Agr Sci, Hangzhou 310021, Peoples R China
3.Shizishan St,Hongshan Dist, Wuhan 430070, Hubei, Peoples R China
关键词： Nitrite; Thyroid hormone; Iodothyronine deiodinase; Intestinal transporters; Ctenopharyngodon idellus
期刊名称：ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY （ 影响因子：7.129； 五年影响因子：7.284 ）
ISSN： 0147-6513
年卷期： 2022 年 237 卷
页码：
收录情况： SCI
摘要： Nitrite in the aquatic environment potentially disturbs thyroid hormone (TH) homeostasis in peripheral tissues, but little is known about TH metabolism in the intestine. This study investigated the serum concentrations of THs and thyroid-stimulating hormone (TSH) as well as the activity of intestinal iodothyronine deiodinases (IDs) of grass carp (Ctenopharyngodon idellus) exposed to various concentrations of nitrite (0, 8, 25, or 50 mg/L) for 96 h. Acute nitrite exposure significantly altered the triiodothyronine (T3) levels and the morphology of thyroid fol-licles at 96 h. Thyroxine (T4), free T4 levels and intestinal IDs activities showed an increase trend under nitrite stress. After 96 h exposure, nitrite down-regulated the expressions levels of intestinal Akt1 protein, sugar transporter genes, and thyroid hormone receptor (TR) signaling pathway genes except for tr alpha1 and tr alpha2. Moreover, the expressions levels of ppar gamma, cpt1 alpha, cd36, fabp2 and fatp4 were down-regulated, whereas fabp6 and lpl were up-regulated in the 50 mg/L exposure group at 96 h. The results indicate that acute nitrite exposure has the potential to disturb the homeostasis of intestinal TH metabolism, which in turn alters TRs genes transcription, down-regulates sugar transporter activities, and promotes the energy expenditure in gut of grass carp.
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