Formation of Kiss1R/GPER Heterocomplexes Negatively Regulates Kiss1R-mediated Signalling through Limiting Receptor Cell Surface Expression

Ran Ke, Samson Ian Sam Lok, Kailash Singh, Billy Kwok Chong Chow, Harald Janovjak, Leo Tsz On Lee

Research output: Contribution to journalArticleResearchpeer-review

1 Citation (Scopus)

Abstract

Kisspeptin receptor (Kiss1R) is an important receptor that plays central regulatory roles in reproduction by regulating hormone release in the hypothalamus. We hypothesize that the formation of heterocomplexes between Kiss1R and other hypothalamus G protein-coupled receptors (GPCRs) affects their cellular signaling. Through screening of potential interactions between Kiss1R and hypothalamus GPCRs, we identified G protein-coupled estrogen receptor (GPER) as one interaction partner of Kiss1R. Based on the recognised function of kisspeptin and estrogen in regulating the reproductive system, we investigated the Kiss1R/GPER heterocomplex in more detail and revealed that complex formation significantly reduced Kiss1R-mediated signaling. GPER did not directly antagonize Kiss1R conformational changes upon ligand binding, but it rather reduced the cell surface expression of Kiss1R. These results therefore demonstrate a regulatory mechanism of hypothalamic hormone receptors via receptor cooperation in the reproductive system and modulation of receptor sensitivity.

Original languageEnglish
Article number166843
Number of pages16
JournalJournal of Molecular Biology
Volume433
Issue number7
DOIs
Publication statusPublished - 2 Apr 2021

Keywords

  • cell signaling
  • G protein-coupled estrogen receptor
  • GPCR dimerization
  • Kisspeptin receptor

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