RhoA-mediated G₁₂-G₁₃ signaling maintains muscle stem cell quiescence and prevents stem cell loss.

ABSTRACT: Multiple processes control quiescence of muscle stem cells (MuSCs), which is instrumental to guarantee long-term replenishment of the stem cell pool. Here, we describe that the G-proteins G₁₂-G₁₃ integrate signals from different G-protein-coupled receptors (GPCRs) to control MuSC quiescence via activation of RhoA. Comprehensive screening of GPCR ligands identified two MuSC-niche-derived factors, endothelin-3 (ET-3) and neurotensin (NT), which activate G₁₂-G₁₃ signaling in MuSCs. Stimulation with ET-3 or NT prevented MuSC activation, whereas pharmacological inhibition of ET-3 or NT attenuated MuSC quiescence. Inactivation of Gna12-Gna13 or Rhoa but not of Gnaq-Gna11 completely abrogated MuSC quiescence, which depleted the MuSC pool and was associa

SUBMITTER: Peng Y 

PROVIDER: S-EPMC11251043 | biostudies-literature | 2024 Jul

REPOSITORIES: biostudies-literature