Journal
GENERAL AND COMPARATIVE ENDOCRINOLOGY
Volume 261, Issue -, Pages 115-126Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.ygcen.2018.02.010
Keywords
Secretoneurin; Orange-spotted grouper; Expression patterns; Reproductive function
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Funding
- Guangdong Provincial Natural Science Foundation [2015A030313509, 2015A030313069]
- National Natural Science Foundation of China [31672631, 31572596]
- China Agriculture Research System [CARS-47]
- Guangdong Provincial Science and Technology Program [2014A020208145]
- Agro-scientific Research in the Public Interest [201403011]
- program of the China-ASEAN Maritime Cooperation Fund of Chinese government
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Secretoneurin (SN) is an important stimulator of pituitary luteinizing hormone (LH) synthesis and secretion in goldfish. It is unknown whether this neuropeptide performs the same role in other fish species. In this study, the full-length cDNAs encoding Secretogranin lla (Sglla) and b (SgIlb) were cloned from the brain of orange-spotted grouper. Sequence analysis showed that a 34-amino acid SN peptide (SNa) is present in Sglla proprotein, and a 33-amino acid SN peptide (SNb) is present in SgIlb proprotein. The two SN peptides share a low degree of similarity but contain the signature YTPQ-X-LA-X-7-EL sequence. Real-time PCR showed that two Sgll genes are mainly expressed in the brain and pituitary. During ovarian development, the expression levels of two SgII genes in the hypothalamus and pituitary were significantly reduced at the stage when the ovary contained full-grown oocytes. The biological functions of the two SN peptides were further investigated in vitro and in vivo. Both SN peptides could significantly elevate the mRNA levels of Gonadotropin-Releasing Hormone 1 (GnRH1) and 3 (GnRH3) in the hypothalamic fragments and upregulated the expression of Follicle-Stimulating Hormone beta (FSHb) and Luteinizing Hormone beta (LHb) in the pituitary cells. The stimulatory effects on the expression of GnRHs and Gonadotropins were also observed after intraperitoneal injection of SN peptides. Our study indicated that the SgII/SN system has stimulatory effects on the reproductive axis of orange-spotted grouper. (C) 2018 Elsevier Inc. All rights reserved.
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