GR 73632 is a NK1 tachykinin receptor agonist used in the treatment of asthma and gastrointestinal disorders. It is involved in the contraction of muscles.
Neurokinin (NK) receptors are acted upon by tachykinins or neurokinins namely, NKA and NKB. These are endogenous ligands. An exogenous agonist/ligand for NK1 is GR 64349 petpide.
GR 73632 interacts with neurokinin (NK1) receptor, which results in rhythmic tapping of hind-foot in gerbils. Administration of this peptide in the intra-ventral tegmental area (VTA) results in locomotor activity. It interacts with and activates NK1 receptors present on smooth muscle and interstitial cells of Cajal, resulting in elevated distention-induced peristalsis.
