Effect of desipramine on dopamine receptor binding in vivo

Journal Article · Mon Jan 01 00:00:00 EST 1990 · Life Sciences; (USA)

DOI:https://doi.org/10.1016/0024-3205(90)90311-E· OSTI ID:6098650

Suhara, Tetsuya ^[1]; Inoue, Osamu; Kobayasi, Kaoru ^[2]

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1. National Institute of Radiological Sciences, Chiba (Japan) Jikei Univ., Tokyo (Japan)
2. National Institute of Radiological Sciences, Chiba (Japan)

Effect of desipramine on the in vivo binding of {sup 3}H-SCH23390 and {sup 3}H-N-methylspiperone ({sup 3}H-NMSP) in mouse striatum was studied. The ratio of radioactivity in the striatum to that in the cerebellum at 15 min after i.v. injection of {sup 3}H-SCH23390 or 45 min after injection of {sup 3}H-NMSP were used as indices of dopamine D1 or D2 receptor binding in vivo, respectively. In vivo binding of D1 and D2 receptors was decreased in a dose-dependent manner by acute treatment with desipramine (DMI). A saturation experiment suggested that the DMI-induced reduction in the binding was mainly due to the decrease in the affinity of both receptors. No direct interactions between the dopamine receptors and DMI were observed in vitro by the addition of 1 mM of DMI into striatal homogenate. Other antidepressants such as imipramine, clomipramine, maprotiline and mianserin also decreased the binding of dopamine D1 and D2 receptors. The results indicated an important role of dopamine receptors in the pharmacological effect of antidepressants.

• OSTI ID: 6098650
• Journal Information: Life Sciences; (USA), Vol. 47:23; ISSN 0024-3205
• Country of Publication: United States
• Language: English

Related Subjects

59 BASIC BIOLOGICAL SCIENCES
ANTIDEPRESSANTS
BIOLOGICAL EFFECTS
DOPAMINE
RECEPTORS
BIOCHEMICAL REACTION KINETICS
AFFINITY
BRAIN
DOSE-RESPONSE RELATIONSHIPS
MICE
TRACER TECHNIQUES
TRITIUM COMPOUNDS
AMINES
ANIMALS
AROMATICS
AUTONOMIC NERVOUS SYSTEM AGENTS
BODY
CARDIOTONICS
CARDIOVASCULAR AGENTS
CENTRAL NERVOUS SYSTEM
CENTRAL NERVOUS SYSTEM AGENTS
DRUGS
HYDROGEN COMPOUNDS
HYDROXY COMPOUNDS
ISOTOPE APPLICATIONS
KINETICS
MAMMALS
MEMBRANE PROTEINS
NERVOUS SYSTEM
NEUROREGULATORS
ORGANIC COMPOUNDS
ORGANS
PHENOLS
POLYPHENOLS
PROTEINS
PSYCHOTROPIC DRUGS
REACTION KINETICS
RODENTS
SYMPATHOMIMETICS
VERTEBRATES
550201* - Biochemistry- Tracer Techniques