Article (Scientific journals)
Dopamine binds to alpha(2)-adrenergic receptors in the song control system of zebra finches (Taeniopygia guttata).
Cornil, Charlotte; Castelino, Christina B; Ball, Gregory F
2008In Journal of Chemical Neuroanatomy, 35 (2), p. 202-15
Peer Reviewed verified by ORBi
 

Files


Full Text
20. CornilJCheneu2008.pdf
Publisher postprint (1.29 MB)
Request a copy

All documents in ORBi are protected by a user license.

Send to



Details



Keywords :
Adrenergic alpha-Antagonists/metabolism; Animals; Brain/drug effects/physiology; Clozapine/pharmacology; Dopamine/metabolism; Finches/physiology; Haloperidol/pharmacology; Homeostasis; Idazoxan/analogs & derivatives/metabolism/pharmacology; Male; Raclopride/pharmacology; Receptors, Adrenergic, alpha-2/drug effects/metabolism; Vocalization, Animal/drug effects
Abstract :
[en] A commonly held view is that dopamine exerts its effects via binding to D1- and D2-dopaminergic receptors. However, recent data have emerged supporting the existence of a direct interaction of dopamine with adrenergic but this interaction has been poorly investigated. In this study, the pharmacological basis of possible in vivo interactions between dopamine and alpha(2)-adrenergic receptors was investigated in zebra finches. A binding competition study showed that dopamine displaces the binding of the alpha(2)-adrenergic ligand, [(3)H]RX821002, in the brain. The affinity of dopamine for the adrenergic sites does not differ between the sexes and is 10- to 28-fold lower than that for norepinephrine. To assess the anatomical distribution of this interaction, binding competitions were performed on brain slices incubated in 5nM [(3)H]RX821002 in the absence of any competitor or in the presence of norepinephrine [0.1microM] or dopamine [1microM]. Both norepinephrine and dopamine displaced the binding of the radioligand though to a different extent in most of the regions studied (e.g., area X, the lateral part of the magnocellular nucleus of anterior nidopallium, HVC, arcopallium dorsale, ventral tegmental area and substantia grisea centralis) but not in the robust nucleus of the arcopallium. Together these data provide evidence for a direct interaction between dopamine and adrenergic receptors in songbird brains albeit with regional variation.
Disciplines :
Neurosciences & behavior
Author, co-author :
Cornil, Charlotte  ;  Université de Liège - ULiège > Département des sciences biomédicales et précliniques > Biologie de la différenciation sexuelle du cerveau
Castelino, Christina B
Ball, Gregory F
Language :
English
Title :
Dopamine binds to alpha(2)-adrenergic receptors in the song control system of zebra finches (Taeniopygia guttata).
Publication date :
2008
Journal title :
Journal of Chemical Neuroanatomy
ISSN :
0891-0618
eISSN :
1873-6300
Publisher :
Elsevier Science, Amsterdam, Netherlands
Volume :
35
Issue :
2
Pages :
202-15
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 21 April 2009

Statistics


Number of views
135 (3 by ULiège)
Number of downloads
0 (0 by ULiège)

Scopus citations®
 
22
Scopus citations®
without self-citations
20
OpenCitations
 
22

Bibliography


Similar publications



Contact ORBi