Identification and functional characterization of two Secretogranin II genes in orange-spotted grouper (Epinephelus coioides)

General and Comparative Endocrinology
Hu ShuShuisheng Li

Abstract

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 IIa (SgIIa) and b (SgIIb) were cloned from the brain of orange-spotted grouper. Sequence analysis showed that a 34-amino acid SN peptide (SNa) is present in SgIIa proprotein, and a 33-amino acid SN peptide (SNb) is present in SgIIb proprotein. The two SN peptides share a low degree of similarity but contain the signature YTPQ-X-LA-X7-EL sequence. Real-time PCR showed that two SgII 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)...Continue Reading

Citations

May 30, 2020·Proceedings of the National Academy of Sciences of the United States of America·Kimberly MitchellVance L Trudeau
Jul 28, 2020·General and Comparative Endocrinology·Gustavo M SomozaVance L Trudeau
Jun 29, 2021·General and Comparative Endocrinology·Yu LiYong Zhang
Jul 3, 2020·General and Comparative Endocrinology·Yonathan Zohar

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