Metastin stimulates aldosterone synthesis in human adrenal cells

Yasuhiro Nakamura, Satoshi Aoki, Yewei Xing, Hironobu Sasano, William E. Rainey

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)

Abstract

Kisspeptins, including metastin, are encoded by the KiSS-1 gene and play an important role in regulating the hypothalamic gonadotropin-releasing hormone (GnRH) system via G protein-coupled receptor 54 (GPR54, also called KiSS-1R). Normally, metastin (also called Kp-54) levels are quite low, except during pregnancy, when levels increase 1000-fold over those found in men and nonpregnant women. However, the potential hormonal role of metastin in the fetal and maternal circulation is unknown. In this study, the authors examine the levels of GPR54 mRNA expression in human adult and fetal adrenals using quantitative real-time reverse-transcriptase polymerase chain reaction (RT-PCR). In addition, they examine the effects of metastin on steroidogenesis and steroidogenic enzyme mRNA levels in fetal adrenal cells and in the H295R adrenocortical cell line using enzyme immunoassay and RT-PCR techniques. The authors demonstrate that GPR54 mRNA is significantly higher (50-fold) in human fetal adrenals than in adult adrenals. Immunohistochemical studies have demonstrated that the GPR54 protein is predominantly expressed in the neocortex of human fetal adrenals in the third trimester. Metastin increases aldosterone production (approximately 2-fold) in both fetal neocortex adrenal cells and H295R adrenal cells, with a maximal increase seen at 100 nM. In addition, metastin increased angiotensin II (Ang II)-stimulated aldosterone production by approximately 1.5-fold. Metastin also increased the ability of the H295R cells to metabolize exogenously added pregnenolone to aldosterone but had no effect on the expression of aldosterone synthase (CYP11B2). These results suggest that the high fetal/maternal levels of metastin seen during pregnancy may affect adrenal production of aldosterone.

Original languageEnglish
Pages (from-to)836-845
Number of pages10
JournalReproductive Sciences
Volume14
Issue number8
DOIs
Publication statusPublished - 2007 Dec

Keywords

  • Aldosterone
  • G protein-coupled receptor 54
  • Human fetal adrenal neocortex
  • Kisspeptins
  • Metastin

ASJC Scopus subject areas

  • Obstetrics and Gynaecology

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