Abstract
Metallothioneins (MTs) are a family of stress proteins that are involved in the process of detoxification and anti-oxidation. Previous studies have focused mostly on the expression and functions of MTs in the non-reproductive tissues of aquatic vertebrates. However, there have been only a few reports regarding the functions of MTs in the reproductive tissues of such vertebrates. In order to investigate the function of MTs during spermatogenesis in Pseudosciaena crocea, reverse-transcription polymerase chain reaction (PCR) and rapid amplification of cDNA ends were performed to obtain the P. crocea MT complete cDNA sequence from the total RNA of the testes for the first time. MT was detected in the liver, kidneys, testes, spleen, gill and muscle of P. crocea by tissue-specific expression analysis. Meanwhile, immunohistochemistry staining indicated that the MT protein was localized in germ cells, Sertoli cells and the peripheral connective tissues in P. crocea testes. Furthermore, acute toxicity tests were conducted with cadmium (Cd) to determine the 96 h-medial lethal concentration value. The toxic effects of Cd on the microstructure and ultrastructure of the testes were observed. In addition, the changes in MT mRNA expression levels in the testes after Cd exposure were measured using real-time quantitative PCR. Consequently, we suggest that MTs play an important role in spermatogenesis and testes protection against Cd toxicity in P. crocea.
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Abbreviations
- Cd:
-
Cadmium
- Ct:
-
Threshold cycle
- F:
-
Forward
- LC50 :
-
Medial lethal concentration
- MTs:
-
Metallothioneins
- PBS:
-
Phosphate-buffered saline
- R:
-
Reverse
- RACE:
-
Rapid amplification of cDNA ends
- RT-PCR:
-
Reverse-transcription polymerase chain reaction
- SD:
-
Standard deviation
- TD-PCR:
-
Touchdown PCR
- UTRs:
-
Untranslated regions
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Acknowledgments
We are indebted to Dr. Chun-Yi Hu in Shanghai Institute of Biochemistry and Cell Biology, Dr. Wen-Kai Han in Anhui Normal University, all members of the Sperm Laboratory at Zhejiang University, and all members of our laboratory at Ningbo University for their valuable discussion and inspiring help. This project was financially supported by the National Natural Science Foundation of China (Nos. 31272642 and 41276151), K.C. Wong Magna Fund in Ningbo University, the Scientific and Technical Project of Zhejiang Province (No. 2012C12907-8), the Scientific and Technical Project of Ningbo City (No. 2011C11005), and the Innovation Team Project of Ningbo City (No. 2011B82018).
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The authors declare that there is no conflict of interest regarding the publication of this paper.
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Sheng, Z., Yang, WX. & Zhu, JQ. Metallothionein from Pseudosciaena crocea: expression and response to cadmium-induced injury in the testes. Ecotoxicology 24, 779–794 (2015). https://doi.org/10.1007/s10646-015-1423-y
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DOI: https://doi.org/10.1007/s10646-015-1423-y