<prompt> All these hormones use cAMP as the second messenger exceptCoicotropinDopamineGlucagonvasopressin  <response>: Vasopressin is a nonpeptide acting through GQPCR- a type of G protein-coupled cell membrane receptors which act through the phospholipase C-IP3DAG pathway. Ref.Essentials of medical pharmacology TD Tripathi 7th edition page no.593 