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Cloning, molecular characterization and expression analysis of insulin-like growth factor binding protein-2 (IGFBP-2) cDNA in goldfish, Carassius auratus

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Abstract

In the present study, a full-length cDNA encoding the insulin-like growth factor binding protein-2 (IGFBP-2) was cloned from the liver of goldfish (Carassius auratus) by rapid amplification of cDNA ends technique. The goldfish IGFBP-2 cDNA sequence was 1,513 bp long and had an open reading frame of 825 bp encoding a predicted polypeptide of 274 amino acid residues. Semi-quantitative RT-PCR results revealed that goldfish IGFBP-2 mRNA was expressed in all detected tissues. In liver, central nervous system and pituitary gland, goldfish IGFBP-2 expressed at high levels, followed by anterior intestine, middle intestine and kidney. In posterior intestine, ovary, skin, fat, spleen, muscle and gill, the goldfish IGFBP-2 expression levels were very low. Fasting and refeeding experiment showed that the mRNA expression of goldfish IGFBP-2 was up-regulated significantly in liver compared to the fed group and restored rapidly to normal level after refed. However, the mRNA expressions of IGFBP-2 in hypothalamus and pituitary of goldfish were insensitive to fasting. Furthermore, the mRNA expressions of IGFBP-2 in hypothalamus, pituitary and liver were varied in periprandial changes and significantly down-regulated at 2 and 4 h after meal. These results imply that the IGFBP-2 mRNA expression may be associated with anabolic and catabolic metabolism and regulated by metabolic factors in goldfish.

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Acknowledgments

This work was supported by the National Natural Science Foundation of China (No. 31101878); the Hydrobiological Project of Shanghai Leading Academic Discipline (III) (S30701); the Excellent Youth Foundation (No. J2014-02) of Henan Polytechnic University and the Dr. Foundation (No. B2010-07) of Henan Polytechnic University to Dr. Wenbo Chen.

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  1. Department of Biology, Institute of Resources and Environment, Henan Polytechnic University, Jiaozuo, 454000, Henan, People’s Republic of China

    Wenbo Chen, Weiguo Li, Zhen Zhang, Xiaoxue Jiang & Mengjie Li

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  1. Wenbo Chen
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  2. Weiguo Li
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  3. Zhen Zhang
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  4. Xiaoxue Jiang
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Correspondence to Wenbo Chen.

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Chen, W., Li, W., Zhang, Z. et al. Cloning, molecular characterization and expression analysis of insulin-like growth factor binding protein-2 (IGFBP-2) cDNA in goldfish, Carassius auratus . Fish Physiol Biochem 40, 1669–1681 (2014). https://doi.org/10.1007/s10695-014-9958-z

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