G-protein coupled receptor signaling pathway endothelin receptor signaling pathway rfoulger endothelin signaling pathway A series of molecular signals initiated by an endothelin receptor binding to one of its physiological ligands, and proceeding with the activated receptor promoting the exchange of GDP for GTP on the alpha-subunit of an associated heterotrimeric G-protein complex. Ends with regulation of a downstream cellular process, e.g. transcription. biological_process GO:0086100