The reproductive regulation of LPXRFa and its receptor in the hypothalamo-pituitary-gonadal axis of the spotted scat (Scatophagus argus)
| Autor: | Dongneng Jiang, Yi Zhai, Minghui Li, Yang Huang, Si-Ping Deng, Chunhua Zhu, Guangli Li, Jian-ye Liu |
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| Rok vydání: | 2020 |
| Předmět: |
endocrine system
medicine.medical_specialty Physiology medicine.drug_class Hypothalamic–pituitary–gonadal axis Fish reproduction Aquatic Science Biochemistry 03 medical and health sciences Internal medicine medicine Receptor 030304 developmental biology 0303 health sciences biology Scatophagus argus 04 agricultural and veterinary sciences General Medicine biology.organism_classification Open reading frame Endocrinology 040102 fisheries 0401 agriculture forestry and fisheries Gonadotropin Development of the gonads hormones hormone substitutes and hormone antagonists Hormone |
| Zdroj: | Fish Physiology and Biochemistry. 47:93-108 |
| ISSN: | 1573-5168 0920-1742 |
| Popis: | Gonadotropin-inhibitory hormone (GnIH) plays a critical role in regulating gonadotropin-releasing hormone (GnRH), gonadotropin hormone (GtH), and steroidogenesis. The Lpxrfa (the piscine ortholog of GnIH) system has been found to regulate fish reproduction. To gain insight into the role of Lpxrfa in the regulation of spotted scat (Scatophagus argus) reproduction, spotted scat Lpxrfa (ssLpxrfa), and its receptor (ssLpxrfa-r) were cloned and analyzed. Tissue distribution and expression patterns at the hypothalamo-pituitary-gonadal axis (HPG axis) of sslpxrfa and sslpxrfa-r mRNA were also investigated during gonadal development of spotted scat. The open reading frame (ORF) of the sslpxrfa was 606 bp encoding 201 amino acids and includes a putative signal peptide and two mature ssLpxrfa peptides with LPXRFamide motif at their C-terminus. The sslpxrfa-r ORF was 1449 bp encoding 482 amino acids and contracted a seven-hydrophobic transmembrane (TM) domain structure. The tissue distribution showe d that the sslpxrfa was highly expressed in hypothalami, gill, and the gonads. In addition, sslpxrfa-r was highly expressed in hypothalami, pituitaries, and the gonads. Quantitative real-time polymerase chain reaction (qPCR) revealed that sslpxrfa had the highest expression in the hypothalami and pituitaries, and the lowest expression in the gonads in stage V. During gonadal development, the expression of sslpxrfa-r was gradually increased in the hypothalami but reduced in the gonads. However, no obvious trend was observed in the pituitaries. The expression of sslpxrfa and sslpxrfa-r decreased significantly after injection with 17β-estradiol (E2). However, the expression of both sslpxrfa and sslpxrfa-r was not changed after injection with 17α-methyltestosterone(17α-MT) in the hypothalami. In addition, no changes were observed in the expression of fshβ and lhβ in the pituitaries after injecting ssLpxrfa-1. However, ssLpxrfa-2 could downregulate the expression of sbgnrh and fshβ in the hypothalami and pituitaries, respectively. Taken together, these findings suggested that ssLpxrfa may participate in E2 feedback in reproduction and regulate the reproductive axis of spotted scat. |
| Databáze: | OpenAIRE |
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