title: Regulation of DARPP-32 Thr75 phosphorylation by neurotensin in neostriatal neurons: involvement of glutamate signalling.
abstract: Neurotensin is a neuropeptide involved in dopaminergic signalling. We have recently reported that neurotensin stimulates the phosphorylation of DARPP-32 (dopamine- and cAMP-regulated phosphoprotein of Mr 32 kDa) at Thr34 (PKA-site) by activating dopamine D1-type receptors in neostriatal neurons. DARPP-32 is also phosphorylated by cyclin-dependent kinase 5 on Thr75, and the phosphorylated form of DARPP-32 at Thr75 inhibits protein kinase (PKA) activity. In this study, we examined the effect of neurotensin on DARPP-32 Thr75 phosphorylation using mouse neostriatal slices. Neurotensin decreased the level of phospho-Thr75 DARPP-32 at 2 min of incubation, maximally to about 50% of control at a concentration of 1 micro m. Pretreatment with a combined neurotensin receptor type 1 (NTR1)/type 2 (NTR2) antagonist, SR142948, reduced the basal level of phospho-Thr75 DARPP-32 and abolished the ability of neurotensin to decrease DARPP-32 Thr75 phosphorylation. However, neither an NTR1 antagonist, SR48692, an NTR2 antagonist, levocabastine, nor the two combined affected the basal level and the neurotensin-mediated decrease in DARPP-32 Thr75 phosphorylation. The effect of neurotensin was abolished by tetrodotoxin (TTX) or MK801 plus CNQX, but not by SCH23390 or raclopride. These results indicate that neurotensin stimulates the release of glutamate by activating a hypothesized unidentified neurotensin receptor, resulting in the dephosphorylation of DARPP-32 at Thr75 by activating NMDA and AMPA receptors expressed at medium spiny neurons. Thus, neurotensin, by removing the inhibition of PKA by phospho-Thr75 DARPP-32, potentiates its signalling via the dopamine/D1 receptor/PKA/phospho-Thr34 DARPP-32/PP-1 cascade.
authors.affiliation: Department of Physiology, Kurume University School of Medicine, 67 Asahi-machi, Kurume, Fukuoka 830-0011, Japan.
authors.forename: Seiichiro
authors.initials: S
authors.lastname: Matsuyama
authors.forename: Ryuichi
authors.initials: R
authors.lastname: Fukui
authors.forename: Hideho
authors.initials: H
authors.lastname: Higashi
authors.forename: Akinori
authors.initials: A
authors.lastname: Nishi
mesh_terms: D018750:6-Cyano-7-nitroquinoxaline-2,3-dione / Q000494:pharmacology; D000779:Anesthetics, Local / Q000494:pharmacology; D000818:Animals; D001552:Benzazepines / Q000494:pharmacology; D016291:Dizocilpine Maleate / Q000494:pharmacology; D018492:Dopamine Antagonists / Q000494:pharmacology; D051937:Dopamine and cAMP-Regulated Phosphoprotein 32; D004305:Dose-Response Relationship, Drug; D004347:Drug Interactions; D018691:Excitatory Amino Acid Antagonists / Q000494:pharmacology; D018698:Glutamic Acid / Q000378:metabolism; D006634:Histamine H1 Antagonists / Q000494:pharmacology; D015151:Immunoblotting / Q000379:methods; D066298:In Vitro Techniques; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D017072:Neostriatum / Q000378:metabolism*; D009419:Nerve Tissue Proteins; D009474:Neurons / Q000378:metabolism*; D009496:Neurotensin / Q000378:metabolism* / Q000494:pharmacology; D010750:Phosphoproteins / Q000378:metabolism*; D010880:Piperidines / Q000494:pharmacology; D011720:Pyrazoles / Q000494:pharmacology; D011804:Quinolines / Q000494:pharmacology; D020891:Raclopride / Q000494:pharmacology; D018028:Receptors, Neurotensin / Q000037:antagonists & inhibitors; D015398:Signal Transduction / Q000502:physiology; D013779:Tetrodotoxin / Q000494:pharmacology; D013912:Threonine / Q000378:metabolism*; D013997:Time Factors
chemical_list: D000779:Anesthetics, Local; D001552:Benzazepines; D018492:Dopamine Antagonists; D051937:Dopamine and cAMP-Regulated Phosphoprotein 32; D018691:Excitatory Amino Acid Antagonists; D006634:Histamine H1 Antagonists; D009419:Nerve Tissue Proteins; D010750:Phosphoproteins; D010880:Piperidines; D011720:Pyrazoles; D011804:Quinolines; D018028:Receptors, Neurotensin; C114947:SR 142948; C079087:SR 48692; D013912:Threonine; D009496:Neurotensin; D018698:Glutamic Acid; D020891:Raclopride; D013779:Tetrodotoxin; D016291:Dizocilpine Maleate; D018750:6-Cyano-7-nitroquinoxaline-2,3-dione; C047340:levocabastine