Effects of Se on the Diversity of SelT Synthesis and Distribution in Different Smooth Muscle Tissues in Rats

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• 作者：Mengyao Guo ; Xuejiao Gao ; Naisheng Zhang ; Changwei Qiu…
• 关键词：Selenium ; SelT ; Smooth muscle ; Selenocysteine ; tRNA[Ser]Sec synthase ; Selenophosphate synthetase
• 刊名：Biological Trace Element Research
• 出版年：2016
• 出版时间：April 2016
• 年：2016
• 卷：170
• 期：2
• 页码：340-347
• 全文大小：809 KB
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• 作者单位：Mengyao Guo (1)
  Xuejiao Gao (2)
  Naisheng Zhang (2)
  Changwei Qiu (1)
  Chengye Li (1)
  Ganzhen Deng (1)
  
  1. Department of Clinical Veterinary Medicine, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, 430070, People’s Republic of China
  2. Department of Clinical Veterinary Medicine, College of Veterinary Medicine, Jilin University, Changchun, Jilin Province, 130062, People’s Republic of China
  
• 刊物主题：Biochemistry, general; Biotechnology; Nutrition; Oncology;
• 出版者：Springer US
• ISSN：1559-0720

文摘

Selenium (Se) is a nutritionally essential trace element associated with health and disease, including many muscle diseases. Selenoprotein T (SelT) has been identified as a member of the redoxin protein family that includes selenocysteine, localizing to the endoplasmic reticulum. The synthesis of selenoprotein is influenced by Se. However, there is currently no data concerning the pattern of SelT expression in smooth muscle tissues. To investigate the effects of dietary Se on the expression of SelT, 90 rats were randomly allocated into three groups: LG, NG, and HG. The LG group was fed a basal diet deficient in Se (containing 0.023 mg/kg Se); the NG and HG groups were fed Se-supplemented diets containing either 0.3 or 1.5 mg/kg Se, respectively, for 90 days. The smooth muscle of the esophagus, trachea, stomach, intestine, and blood vessels was collected when the rats were 90 days old. The Se content in the blood and tissues was examined. The messenger RNA (mRNA) of selenocysteine-tRNA[Ser]Sec synthase (SecS), selenophosphate synthetase 1 (SPS1), selenophosphate synthetase 2 (SPS2), and SelT were examined using qPCR, and SelT protein was detected by Western blotting. The results indicated that Se had an effect on the mRNA levels of SecS, with little effect on those of SPS1 in smooth muscle tissues. SelT was expressed in the smooth muscle tissues of blood vessels, esophagus, bronchus, stomach, and intestine, and the transcription of the SelT was very sensitive to dietary Se. Thus, SelT may play a major role in the mechanisms underlying the biological activity of Se in smooth muscle tissues.