The orphan GPR50 receptor promotes constitutive TGFβ receptor signaling and protects against cancer development - Inserm - Institut national de la santé et de la recherche médicale Access content directly
Journal Articles (Data Paper) Nature Communications Year : 2018

The orphan GPR50 receptor promotes constitutive TGFβ receptor signaling and protects against cancer development

Raise Ahmad
  • Function : Author
Julie Dam
  • Function : Author
Avais Daulat
  • Function : Author
Olivier Lahuna
  • Function : Author
Anastasia Saade
  • Function : Author
Kenjiro Tadagaki
  • Function : Author
Ralf Jockers
  • Function : Author

Abstract

Abstract Transforming growth factor-β (TGFβ) signaling is initiated by the type I, II TGFβ receptor (TβRI/TβRII) complex. Here we report the formation of an alternative complex between TβRI and the orphan GPR50, belonging to the G protein-coupled receptor super-family. The interaction of GPR50 with TβRI induces spontaneous TβRI-dependent Smad and non-Smad signaling by stabilizing the active TβRI conformation and competing for the binding of the negative regulator FKBP12 to TβRI. GPR50 overexpression in MDA-MB-231 cells mimics the anti-proliferative effect of TβRI and decreases tumor growth in a xenograft mouse model. Inversely, targeted deletion of GPR50 in the MMTV/Neu spontaneous mammary cancer model shows decreased survival after tumor onset and increased tumor growth. Low GPR50 expression is associated with poor survival prognosis in human breast cancer irrespective of the breast cancer subtype. This describes a previously unappreciated spontaneous TGFβ-independent activation mode of TβRI and identifies GPR50 as a TβRI co-receptor with potential impact on cancer development.
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Dates and versions

inserm-04021787 , version 1 (09-03-2023)

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Stefanie Wojciech, Raise Ahmad, Zakia Belaid-Choucair, Anne-Sophie Journé, Sarah Gallet, et al.. The orphan GPR50 receptor promotes constitutive TGFβ receptor signaling and protects against cancer development. Nature Communications, 2018, 9 (1), pp.1216. ⟨10.1038/s41467-018-03609-x⟩. ⟨inserm-04021787⟩
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