title: Investigating complex basal ganglia circuitry in the regulation of motor behaviour, with particular focus on orofacial movement.
abstract: Current concepts of basal ganglia function have evolved from the essentially motoric, to include a range of extramotoric functions that involve not only dopaminergic but also cholinergic, γ-aminobutyric acid (GABA)ergic and glutamatergic mechanisms. We consider these mechanisms and their efferent systems, including spiralling, feed-forward striato-nigro-striatal circuitry, involving the dorsal and ventral striatum and the nucleus accumbens (NAc) core and shell. These processes are illustrated using three behavioural models: turning-pivoting, orofacial movements in rats and orofacial movements in genetically modified mice. Turning-pivoting indicates that dopamine-dependent behaviour elicited from the NAc shell is funnelled through the NAc-nigro-striato-nigro-pedunculopontine pathway, whereas acetylcholine-dependent behaviour elicited from the NAc shell is funnelled through the NAc-ventral pallidum-mediodorsal thalamus pathway. Cooperative/synergistic interactions between striatal D1-like and D2-like dopamine receptors regulate individual topographies of orofacial movements that are funnelled through striatal projection pathways and involve interactions with GABAergic and glutamatergic receptor subtypes. This application of concerted behavioural, neurochemical and neurophysiological techniques implicates a network that is yet broader and interacts with other neurotransmitters and neuropeptides within subcortical, cortical and brainstem regions to 'sculpt' aspects of behaviour into its topographical collective.
authors.affiliation: aDepartment of Pharmacology, Nihon University School of Dentistry bDepartment of Pathophysiology and Therapeutics, Hoshi University School of Pharmacy and Pharmaceutical Sciences, Tokyo cDepartment of Diagnostic and Therapeutic Sciences, Meikai University School of Dentistry, Saitama dDepartment of Pharmacology, Nihon University School of Dentistry at Matsudo, Chiba, Japan eMolecular and Cellular Therapeutics, Royal College of Surgeons in Ireland, Dublin, Ireland.
authors.forename: Hiroko
authors.initials: H
authors.lastname: Ikeda
authors.forename: Kazunori
authors.initials: K
authors.lastname: Adachi
authors.forename: Satoshi
authors.initials: S
authors.lastname: Fujita
authors.forename: Katsunori
authors.initials: K
authors.lastname: Tomiyama
authors.forename: Tadashi
authors.initials: T
authors.lastname: Saigusa
authors.forename: Masayuki
authors.initials: M
authors.lastname: Kobayashi
authors.forename: Noriaki
authors.initials: N
authors.lastname: Koshikawa
authors.forename: John L
authors.initials: JL
authors.lastname: Waddington
mesh_terms: D000109:Acetylcholine / Q000378:metabolism; D000818:Animals; D001479:Basal Ganglia / Q000502:physiology*; D001522:Behavior, Animal / Q000502:physiology; D003342:Corpus Striatum / Q000502:physiology; D004298:Dopamine / Q000378:metabolism; D005145:Face / Q000502:physiology; D051379:Mice; D008822:Mice, Transgenic; D009043:Motor Activity / Q000502:physiology*; D009068:Movement / Q000502:physiology; D009714:Nucleus Accumbens / Q000502:physiology*; D051381:Rats; D011954:Receptors, Dopamine / Q000378:metabolism; D066328:Ventral Striatum / Q000502:physiology
chemical_list: D011954:Receptors, Dopamine; D000109:Acetylcholine; D004298:Dopamine