Dopamine D(2)-like receptor binding in the brain of male Japanese quail (Coturnix japonica).
Japanese quail (Coturnix japonica) have been used extensively to study appetitive behaviors. However, little is known about the appetitive-relevant neurochemical systems in this species. The present investigation examined the distribution of D(2)-like dopamine receptors in the quail brain. [(3)H]Spiperone was incubated in brain tissue homogenates and non-specific binding was defined using (-)-sulpiride. Scatchard analysis of whole brain without cerebellum and forebrain alone indicated approximate K(d)'s of 0.08 and 0.04 nM, respectively. In addition, the preferential D(3) agonist (+/-)-2-dipropylamino-7-hydroxy-1,2,3, 4-tetrahydronaphthalene hydrobromide (7-OH-DPAT) did not displace [(3)H]spiperone binding in quail forebrain. Finally, regional analysis showed that the highest densities of D(2)-like receptors were located in the forebrain. Overall, these results indicate that there is some conservation of dopaminergic mechanisms between aves and mammals. Thus, Japanese quail may be useful for examining the neuropharmacological mechanisms of dopaminergic stimulant drugs that work via D(2)-like receptor activation.
Levens
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Department of Psychology, University of Kentucky, Lexington 40506-0044, USA.
Green
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TA
Akins
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CK
Bardo
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MT
D000818:Animals; D001522:Behavior, Animal / Q000187:drug effects / Q000502:physiology; D001665:Binding Sites / Q000187:drug effects / Q000502:physiology; D001921:Brain / Q000166:cytology / Q000187:drug effects* / Q000378:metabolism*; D003370:Coturnix / Q000033:anatomy & histology / Q000378:metabolism*; D004298:Dopamine / Q000378:metabolism*; D018492:Dopamine Antagonists / Q000494:pharmacology; D008297:Male; D009474:Neurons / Q000166:cytology / Q000187:drug effects* / Q000378:metabolism*; D011869:Radioligand Assay; D017448:Receptors, Dopamine D2 / Q000187:drug effects* / Q000378:metabolism; D012201:Reward; D013134:Spiperone / Q000494:pharmacology; D019966:Substance-Related Disorders / Q000378:metabolism / Q000473:pathology / Q000503:physiopathology; D013764:Tetrahydronaphthalenes / Q000494:pharmacology; D014316:Tritium
D018492:Dopamine Antagonists; D017448:Receptors, Dopamine D2; D013764:Tetrahydronaphthalenes; D014316:Tritium; D013134:Spiperone; C031349:7-hydroxy-2-N,N-dipropylaminotetralin; D004298:Dopamine