Link between D sub 1 and D sub 2 dopamine receptors is reduced in schizophrenia and Huntington diseased brain

Journal Article · Fri Dec 01 00:00:00 EST 1989 · Proceedings of the National Academy of Sciences of the United States of America; (USA)

DOI:https://doi.org/10.1073/pnas.86.24.10156· OSTI ID:7138048

Seeman, P; Niznik, H B; Guan, H C; Booth, G; Ulpian, C ^[1]

---

1. Univ. of Toronto (Canada)

Dopamine receptor types D{sub 1} and D{sub 2} can oppose enhance each other's actions for electrical, biochemical, and psychomotor effects. The authors report a D{sub 1}-D{sub 2} interaction in homogenized tissue as revealed by ligand binding. D{sub 2} agonists lowered the binding of ({sup 3}H)raclopride to D{sub 2} receptors in striatal and anterior pituitary tissues. Pretreating the tissue with the D{sub 1}-selective antagonist SCH 23390 prevented the agonist-induced decrease in ({sup 3}H)raclopride binding to D{sub 2} sites in the striatum but not in the anterior pituitary, which has no D{sub 1} receptors. Conversely, a dopamine-induced reduction in the binding of ({sup 3}H)SCH 23390 to D{sub 1} receptors could be prevented by the D{sub 2}-selective antagonist eticlopride. Receptor photolabeling experiments confirmed both these D{sub 1}-D{sub 2} interactions. The blocking effect by SCH 23390 was similar to that produced by a nonhydrolyzable guanine nucleotide analogue, and SCH 23390 reduced the number of agonist-labeled D{sub 2} receptors in the high-affinity state. Thus, the D{sub 1}-D{sub 2} link may be mediated by guanine nucleotide-binding protein components. The link may underlie D{sub 1}-D{sub 2} interactions influencing behavior, since the link was missing in over half the postmortem striata from patients with schizophrenia and Huntington disease (both diseases that show some hyperdopamine signs) but was present in human control, Alzheimer, and Parkinson striata.

• OSTI ID: 7138048
• Journal Information: Proceedings of the National Academy of Sciences of the United States of America; (USA), Vol. 86:24; ISSN 0027-8424
• Country of Publication: United States
• Language: English

Related Subjects

59 BASIC BIOLOGICAL SCIENCES
DOPAMINE
PHARMACOLOGY
NEUROREGULATORS
RADIORECEPTOR ASSAY
RECEPTORS
MOLECULAR STRUCTURE
DOSE-RESPONSE RELATIONSHIPS
GUANINE
HEREDITARY DISEASES
IODINE 125
LIGANDS
NERVOUS SYSTEM DISEASES
PITUITARY GLAND
PROTEINS
TRITIUM COMPOUNDS
AMINES
AROMATICS
AUTONOMIC NERVOUS SYSTEM AGENTS
AZAARENES
BETA DECAY RADIOISOTOPES
BODY
CARDIOTONICS
CARDIOVASCULAR AGENTS
DAYS LIVING RADIOISOTOPES
DISEASES
DRUGS
ELECTRON CAPTURE RADIOISOTOPES
ENDOCRINE GLANDS
GLANDS
HETEROCYCLIC COMPOUNDS
HYDROGEN COMPOUNDS
HYDROXY COMPOUNDS
INTERMEDIATE MASS NUCLEI
IODINE ISOTOPES
ISOTOPE APPLICATIONS
ISOTOPES
MEMBRANE PROTEINS
NUCLEI
ODD-EVEN NUCLEI
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANS
PHENOLS
POLYPHENOLS
PURINES
RADIOISOTOPES
SYMPATHOMIMETICS
TRACER TECHNIQUES
550201* - Biochemistry- Tracer Techniques