A human endothelin-bombesin receptor polypeptide and DNA (RNA) encoding such polypeptide and a procedure for disclosed. Also disclosed are methods for utilizing such polypeptide for identifying agonists and antagonists to such polypeptide. Agonists to the endothelin-bombesin receptor polypeptide of the present invention may be used to treat asthma, Parkinson's Disease, acute heart failure, hypotension and osteoporosis. Antagonists against such polypeptides may be used therapeutically to treat hypertension, ulcerigenesis, subarachnoid hemorrhage, asthma, tumors, ciclosporin toxicity, cancer and septic shock. Also disclosed are diagnostic methods for detecting mutations in the polynucleotides of the present invention and for detecting levels of the soluble polypeptides in samples derived from a host.