Dopamine D1 receptor development depends on endogenous dopamine.
Profound depletion of forebrain dopamine by 6-hydroxydopamine in neonatal rats (day 3) was associated with up to 82% loss of D1 receptor sites labeled with [3H]SCH-23390 at day 21. Administration of the selective D1 agonist SKF-38393 (days 6-18) abolished the correlation between D1 receptor density and DA concentrations, even with greater than 99% depletion of DA. In intact control animals, there was an inverse correlation between spontaneous variation in levels of DA and D1 receptor site density in forebrain tissue (r = -0.79) which also was abolished by treatment with the D1 agonist. Thus, D1 receptor density may be regulated by reciprocal regulatory processes during normal development, but may fail to develop in the absence of an adequate level of stimulation.
Gelbard
H A
HA
Department of Neurology, Harvard Medical School, Boston, MA.
Teicher
M H
MH
Baldessarini
R J
RJ
Gallitano
A
A
Marsh
E R
ER
Zorc
J
J
Faedda
G
G
D015647:2,3,4,5-Tetrahydro-7,8-dihydroxy-1-phenyl-1H-3-benzazepine / Q000494:pharmacology; D000818:Animals; D000831:Animals, Newborn / Q000378:metabolism; D001552:Benzazepines / Q000378:metabolism; D001921:Brain / Q000187:drug effects / Q000254:growth & development* / Q000378:metabolism; D004298:Dopamine / Q000502:physiology*; D005260:Female; D006892:Hydroxydopamines; D008297:Male; D016627:Oxidopamine; D051381:Rats; D011919:Rats, Inbred Strains; D011954:Receptors, Dopamine / Q000032:analysis* / Q000187:drug effects; D017447:Receptors, Dopamine D1; D014316:Tritium
D001552:Benzazepines; D006892:Hydroxydopamines; D011954:Receptors, Dopamine; D017447:Receptors, Dopamine D1; D014316:Tritium; D015647:2,3,4,5-Tetrahydro-7,8-dihydroxy-1-phenyl-1H-3-benzazepine; D016627:Oxidopamine; D004298:Dopamine