title: Methamphetamine-induced sensitization is associated with alterations to the proteome of the prefrontal cortex: implications for the maintenance of psychotic disorders.
abstract: Repeat administration of psychostimulants, such as methamphetamine, produces a progressive increase in locomotor activity (behavioral sensitization) in rodents that is believed to represent the underlying neurochemical changes driving psychoses. Alterations to the prefrontal cortex (PFC) are suggested to mediate the etiology and maintenance of these behavioral changes. As such, the aim of the current study was to investigate changes to protein expression in the PFC in male rats sensitized to methamphetamine using quantitative label-free shotgun proteomics. A methamphetamine challenge resulted in a significant sensitized locomotor response in methamphetamine pretreated animals compared to saline controls. Proteomic analysis revealed 96 proteins that were differentially expressed in the PFC of methamphetamine treated rats, with 20% of these being previously implicated in the neurobiology of schizophrenia in the PFC. We identified multiple biological functions in the PFC that appear to be commonly altered across methamphetamine-induced sensitization and schizophrenia, and these include synaptic regulation, protein phosphatase signaling, mitochondrial function, and alterations to the inhibitory GABAergic network. These changes could inform how alterations to the PFC could underlie the cognitive and behavioral dysfunction commonly seen across psychoses and places such biological changes as potential mediators in the maintenance of psychosis vulnerability.
authors.affiliation: Department of Psychology, ‡Department of Chemistry and Biomolecular Sciences, §Australian School of Advanced Medicine, Macquarie University , Sydney, New South Wales 2109, Australia.
authors.forename: Travis A
authors.initials: TA
authors.lastname: Wearne
authors.forename: Mehdi
authors.initials: M
authors.lastname: Mirzaei
authors.forename: Jane L
authors.initials: JL
authors.lastname: Franklin
authors.forename: Ann K
authors.initials: AK
authors.lastname: Goodchild
authors.forename: Paul A
authors.initials: PA
authors.lastname: Haynes
authors.forename: Jennifer L
authors.initials: JL
authors.lastname: Cornish
mesh_terms: D000818:Animals; D059333:Central Nervous System Sensitization / Q000187:drug effects*; D002853:Chromatography, Liquid; D030562:Databases, Protein; D004591:Electrophoresis, Polyacrylamide Gel; D008297:Male; D008694:Methamphetamine / Q000009:adverse effects*; D008959:Models, Neurological; D017397:Prefrontal Cortex / Q000187:drug effects / Q000378:metabolism*; D020543:Proteome / Q000187:drug effects / Q000378:metabolism*; D011618:Psychotic Disorders / Q000378:metabolism / Q000503:physiopathology*; D051381:Rats; D013569:Synapses / Q000187:drug effects / Q000378:metabolism*; D053719:Tandem Mass Spectrometry
chemical_list: D020543:Proteome; D008694:Methamphetamine
keywords: GABA; Proteomics; methamphetamine; mitochondrial function; nanoflow LC−MS/MS; prefrontal cortex; protein expression; psychosis; schizophrenia; synaptic proteins