title: Phosphatidylinositol 4-kinase III beta is essential for replication of human rhinovirus and its inhibition causes a lethal phenotype in vivo.
abstract: Human rhinovirus (HRV) is the predominant cause of the common cold, but more importantly, infection may have serious repercussions in asthmatics and chronic obstructive pulmonary disorder (COPD) patients. A cell-based antiviral screen against HRV was performed with a subset of our proprietary compound collection, and an aminothiazole series with pan-HRV species and enteroviral activity was identified. The series was found to act at the level of replication in the HRV infectious cycle. In vitro selection and sequencing of aminothiazole series-resistant HRV variants revealed a single-nucleotide mutation leading to the amino acid change I42V in the essential HRV 3A protein. This same mutation has been previously implicated in resistance to enviroxime, a former clinical-stage antipicornavirus agent. Enviroxime-like compounds have recently been shown to target the lipid kinase phosphatidylinositol 4-kinase III beta (PI4KIIIβ). A good correlation between PI4KIIIβ activity and HRV antiviral potency was found when analyzing the data over 80 compounds of the aminothiazole series, covering a 750-fold potency range. The mechanism of action through PI4KIIIβ inhibition was further demonstrated by small interfering RNA (siRNA) knockdown of PI4KB, which reduced HRV replication and also increased the potency of the PI4KIIIβ inhibitors. Inhibitors from two different structural classes with promising pharmacokinetic profiles and with very good selectivity for PI4KIIIβ were used to dissociate compound-related toxicity from target-related toxicity. Mortality was seen in all dosing groups of mice treated with either compound, therefore suggesting that short-term inhibition of PI4KIIIβ is deleterious.
authors: Boehringer-Ingelheim (Canada) Ltd., Laval, Québec, Canada.
authors: Catherine
authors: C
authors: Spickler
authors: Julie
authors: J
authors: Lippens
authors: Marie-Kristine
authors: MK
authors: Laberge
authors: Sophie
authors: S
authors: Desmeules
authors: Édith
authors: É
authors: Bellavance
authors: Michel
authors: M
authors: Garneau
authors: Tim
authors: T
authors: Guo
authors: Oliver
authors: O
authors: Hucke
authors: Pieter
authors: P
authors: Leyssen
authors: Johan
authors: J
authors: Neyts
authors: Fréderic H
authors: FH
authors: Vaillancourt
authors: Anne
authors: A
authors: Décor
authors: Jeff
authors: J
authors: O'Meara
authors: Michael
authors: M
authors: Franti
authors: Annick
authors: A
authors: Gauthier
mesh_terms: D019870:1-Phosphatidylinositol 4-Kinase / Q000037:antagonists & inhibitors* / Q000235:genetics / Q000378:metabolism; D000818:Animals; D000998:Antiviral Agents / Q000494:pharmacology; D001562:Benzimidazoles / Q000494:pharmacology; D045744:Cell Line, Tumor; D002511:Cephalosporins / Q000494:pharmacology*; D003139:Common Cold / Q000188:drug therapy / Q000821:virology; D005260:Female; D006367:HeLa Cells; D006801:Humans; D051379:Mice; D010091:Oximes; D020641:Polymorphism, Single Nucleotide; D034622:RNA Interference; D034741:RNA, Small Interfering; D012229:Rhinovirus / Q000187:drug effects* / Q000201:enzymology* / Q000254:growth & development; D013449:Sulfonamides; D013844:Thiazoles / Q000494:pharmacology*; D014779:Virus Replication / Q000187:drug effects / Q000235:genetics
chemical_list: D000998:Antiviral Agents; D001562:Benzimidazoles; D002511:Cephalosporins; D010091:Oximes; D034741:RNA, Small Interfering; D013449:Sulfonamides; D013844:Thiazoles; D019870:1-Phosphatidylinositol 4-Kinase; C021595:viroxime
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