title: In vitro and in vivo pharmacological characterization of Pronetupitant, a prodrug of the neurokinin 1 receptor antagonist Netupitant.
abstract: The aim of the present study was to investigate the pharmacological activity of Pronetupitant, a novel compound designed to act as prodrug of the NK1 antagonist Netupitant. In receptor binding experiments Pronetupitant displayed high selectivity for the NK1 receptor. In a calcium mobilization assay performed on CHONK1 cells Pronetupitant (100 nM, 15 min preincubation) behaved as an NK1 antagonist more potent than Netupitant (pK(B) 8.72 and 7.54, respectively). In the guinea pig ileum bioassay Pronetupitant antagonized the contractile effect of SP showing a similar potency as Netupitant (pK(B)≈9). Similar results were obtained with 5 min preincubation time while at 2 min only Pronetupitant produced significant effects. In vivo in mice the intrathecal injection of 0.1 nmol SP elicited the typical scratching, biting and licking (SBL) nociceptive response. This effect of SP was dose dependently (0.1-10 mg/kg) antagonized by Pronetupitant given intravenously 2 h before the peptide. Superimposable results were obtained using Netupitant. Pharmacokinetic studies performed in rats demonstrate that Pronetupitant, after i.v. administration, is quickly (few minutes) and completely converted to Netupitant. Collectively the present results indicated that Pronetupitant acts in vitro as selective NK1 antagonist more potent than Netupitant. However based on the short half-life measured for Pronetupitant in rats, the in vivo action of Pronetupitant can be entirely interpreted as due to its conversion to Netupitant.
authors.affiliation: Department of Medical Sciences, Section of Pharmacology and National Institute of Neuroscience, University of Ferrara, 44121 Ferrara, Italy.
authors.forename: Chiara
authors.initials: C
authors.lastname: Ruzza
authors.affiliation: Department of Medical Sciences, Section of Pharmacology and National Institute of Neuroscience, University of Ferrara, 44121 Ferrara, Italy.
authors.forename: Anna
authors.initials: A
authors.lastname: Rizzi
authors.affiliation: Department of Medical Sciences, Section of Pharmacology and National Institute of Neuroscience, University of Ferrara, 44121 Ferrara, Italy.
authors.forename: Davide
authors.initials: D
authors.lastname: Malfacini
authors.affiliation: Department of Medical Sciences, Section of Pharmacology and National Institute of Neuroscience, University of Ferrara, 44121 Ferrara, Italy.
authors.forename: Stefano
authors.initials: S
authors.lastname: Molinari
authors.affiliation: Preclinical Research and Development Department, Helsinn Healthcare SA, Lugano, Switzerland.
authors.forename: Claudio
authors.initials: C
authors.lastname: Giuliano
authors.affiliation: Preclinical Research and Development Department, Helsinn Healthcare SA, Lugano, Switzerland.
authors.forename: Emanuela
authors.initials: E
authors.lastname: Lovati
authors.affiliation: Preclinical Research and Development Department, Helsinn Healthcare SA, Lugano, Switzerland.
authors.forename: Claudio
authors.initials: C
authors.lastname: Pietra
authors.affiliation: Department of Medical Sciences, Section of Pharmacology and National Institute of Neuroscience, University of Ferrara, 44121 Ferrara, Italy. Electronic address: g.calo@unife.it.
authors.forename: Girolamo
authors.initials: G
authors.lastname: Calo'
mesh_terms: D000818:Animals; D002118:Calcium / Q000378:metabolism; D006168:Guinea Pigs; D006801:Humans; D007082:Ileum / Q000187:drug effects / Q000473:pathology; D051379:Mice; D064729:Neurokinin-1 Receptor Antagonists / Q000493:pharmacokinetics / Q000494:pharmacology*; D059226:Nociceptive Pain / Q000188:drug therapy* / Q000473:pathology; D011355:Prodrugs / Q000493:pharmacokinetics / Q000494:pharmacology*; D011725:Pyridines / Q000493:pharmacokinetics / Q000494:pharmacology*; D051381:Rats; D018040:Receptors, Neurokinin-1 / Q000378:metabolism; D010879:Piperazines; D044482:Benzeneacetamides
chemical_list: D002118:Calcium; D064729:Neurokinin-1 Receptor Antagonists; D011355:Prodrugs; D011725:Pyridines; D018040:Receptors, Neurokinin-1; C508854:netupitant; D010879:Piperazines; D044482:Benzeneacetamides
keywords: Calcium mobilization; Guinea pig ileum; NK(1) receptor; Netupitant; Pronetupitant; SBL test