title: PSD-95 is essential for hallucinogen and atypical antipsychotic drug actions at serotonin receptors.
abstract: Here, we report that postsynaptic density protein of 95 kDa (PSD-95), a postsynaptic density scaffolding protein, classically conceptualized as being essential for the regulation of ionotropic glutamatergic signaling at the postsynaptic membrane, plays an unanticipated and essential role in mediating the actions of hallucinogens and atypical antipsychotic drugs at 5-HT(2A) and 5-HT(2C) serotonergic G-protein-coupled receptors. We show that PSD-95 is crucial for normal 5-HT(2A) and 5-HT(2C) expression in vivo and that PSD-95 maintains normal receptor expression by promoting apical dendritic targeting and stabilizing receptor turnover in vivo. Significantly, 5-HT(2A)- and 5-HT(2C)-mediated downstream signaling is impaired in PSD-95(null) mice, and the 5-HT(2A)-mediated head-twitch response is abnormal. Furthermore, the ability of 5-HT(2A) inverse agonists to normalize behavioral changes induced by glutamate receptor antagonists is abolished in the absence of PSD-95 in vivo. These results demonstrate that PSD-95, in addition to the well known role it plays in scaffolding macromolecular glutamatergic signaling complexes, profoundly modulates metabotropic 5-HT(2A) and 5-HT(2C) receptor function.
authors.affiliation: Department of Biochemistry, Case Western Reserve University School of Medicine, Cleveland, Ohio 44106, USA.
authors.forename: Atheir I
authors.initials: AI
authors.lastname: Abbas
authors.forename: Prem N
authors.initials: PN
authors.lastname: Yadav
authors.forename: Wei-Dong
authors.initials: WD
authors.lastname: Yao
authors.forename: Margaret I
authors.initials: MI
authors.lastname: Arbuckle
authors.forename: Seth G N
authors.initials: SG
authors.lastname: Grant
authors.forename: Marc G
authors.initials: MG
authors.lastname: Caron
authors.forename: Bryan L
authors.initials: BL
authors.lastname: Roth
mesh_terms: D017371:8-Hydroxy-2-(di-n-propylamino)tetralin / Q000494:pharmacology; D000704:Analysis of Variance; D000818:Animals; D000831:Animals, Newborn; D014150:Antipsychotic Agents / Q000494:pharmacology*; D002540:Cerebral Cortex / Q000166:cytology / Q000187:drug effects / Q000378:metabolism; D000076122:Disks Large Homolog 4 Protein; D005786:Gene Expression Regulation / Q000187:drug effects / Q000235:genetics; D049452:Green Fluorescent Proteins / Q000235:genetics; D051528:Guanylate Kinases; D006213:Hallucinogens / Q000494:pharmacology*; D007035:Hypothermia / Q000139:chemically induced; D047908:Intracellular Signaling Peptides and Proteins / Q000172:deficiency / Q000502:physiology*; D008565:Membrane Proteins / Q000172:deficiency / Q000502:physiology*; D051379:Mice; D018345:Mice, Knockout; D008869:Microtubule-Associated Proteins / Q000378:metabolism; D009433:Neural Inhibition / Q000187:drug effects / Q000502:physiology; D009474:Neurons / Q000187:drug effects*; D011485:Protein Binding / Q000187:drug effects; D021381:Protein Transport / Q000187:drug effects / Q000235:genetics; D016760:Proto-Oncogene Proteins c-fos / Q000235:genetics / Q000378:metabolism; D011719:Pyrazines / Q000494:pharmacology; D012333:RNA, Messenger / Q000378:metabolism; D044402:Receptor, Serotonin, 5-HT2A / Q000235:genetics / Q000378:metabolism; D044405:Receptor, Serotonin, 5-HT2C / Q000235:genetics / Q000378:metabolism; D011985:Receptors, Serotonin / Q000187:drug effects / Q000235:genetics / Q000378:metabolism*; D012702:Serotonin Antagonists / Q000378:metabolism / Q000494:pharmacology; D017366:Serotonin Receptor Agonists / Q000494:pharmacology; D014161:Transduction, Genetic
chemical_list: D014150:Antipsychotic Agents; D000076122:Disks Large Homolog 4 Protein; C501447:Dlg4 protein, mouse; D006213:Hallucinogens; D047908:Intracellular Signaling Peptides and Proteins; D008565:Membrane Proteins; D008869:Microtubule-Associated Proteins; C079240:Mtap2 protein, mouse; D016760:Proto-Oncogene Proteins c-fos; D011719:Pyrazines; D012333:RNA, Messenger; D044402:Receptor, Serotonin, 5-HT2A; D044405:Receptor, Serotonin, 5-HT2C; D011985:Receptors, Serotonin; D012702:Serotonin Antagonists; D017366:Serotonin Receptor Agonists; D049452:Green Fluorescent Proteins; C014896:6-chloro-2-(1-piperazinyl)pyrazine; D017371:8-Hydroxy-2-(di-n-propylamino)tetralin; D051528:Guanylate Kinases