Cocaine Treatment Causes Early and Long-lasting Changes in Muscarinic and Dopaminergic Receptors

Overview

Journal Cell Mol Neurobiol

Publisher Springer

Specialties Cell Biology
Molecular Biology
Neurology

Date 2004 Mar 31

PMID 15049517

Citations 8

Authors

D S Macedo

E E Correia

S M M Vasconcelos

L M V Aguiar

G S B Viana

F C F Sousa

Affiliations

Soon will be listed here.

Abstract

1. The study of changes that persist after drug discontinuation could be fundamental to understand the mechanisms involved in craving and relapse. 2. In this work the changes occurring in muscarinic, D1- and D2-like receptors after 30 min (immediate), 1 day (early), 5 and 30 days (late) withdrawal periods were studied, in the striatum of rats treated once a day for 7 days with cocaine 20 and 30 mg/kg, i.p. 3. Binding assays were performed in 10% homogenates and ligands used were [3H]-N-methylscopolamine, [3H]-SCH 23390, and [3H]-spiroperidol for muscarinic (M1 + M2-like), D1-, and D2-like receptors, respectively. 4. Muscarinic receptors presented a downregulation at all doses and discontinuation times, while the dissociation constant (Kd) for this receptor decreased after 30 min, 5 and 30 days abstinence times. In relation to D1-like receptors we found an antagonistic effect with 100% increase in receptor number 30 min after the last cocaine injection, but after 1-day withdrawal a downregulation was observed with both doses that persisted up to 30 days, only with the higher dose. The dissociation constant value (Kd) for this receptor showed a decrease only with 5 and 30 days withdrawal. An increase occurred with D2-like receptors at all doses and withdrawal periods studied, while Kd increased in 30-min, 5, and 30 days withdrawal. 5. In this work we found that the subchronic cocaine treatment produces early and long-lasting modifications in cholinergic muscarinic as well in dopaminergic receptors that persist up to 30 days of cocaine withdrawal.

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