PET imaging of dopamine D2 receptor and transporter availability during acquisition of cocaine self-administration in rhesus monkeys.

Abstract:

:Previous studies have demonstrated that cocaine use alters availability of brain dopamine D2 receptors (D2R) and transporters (DAT). The present study examined the effects of low doses of cocaine on this neuroadaptation. Using positron emission tomography (PET), D2R and DAT availability in the caudate nucleus (Cd), putamen (Pt), anterior cingulate cortex (ACC), and amygdala (AMY) were assessed before and after monkeys acquired cocaine self-administration. Twelve rhesus monkeys were trained to self-administer intravenous cocaine (0.03 mg/kg per injection) under conditions that resulted in low drug intakes. PET scans using radiotracers targeting D2R ([F]fluoroclebopride, FCP) or DAT ([F]-(+)-N-(4-fluorobenzyl)-2β-propanoyl-3β-(4-chlorophenyl)tropane, FCT) were performed when monkeys were cocaine naive and after 9 weeks of self-administration. Before self-administration, D2R availability was significantly higher only in left vs. right Cd, whereas DAT availability was higher in left vs. right Cd, Pt, and ACC. Nonetheless, after cocaine exposure, left-right differences in D2R were apparent in 3 of 4 regions, but only in the ACC for DAT availability. Self-administration of this dose of cocaine did not significantly affect DAT availability in any region and only decreased D2R availability in the ACC. These results demonstrate lateralization of D2R and DAT availability in brain areas that mediate cocaine self-administration, even under conditions in which cocaine does not affect overall receptor availability.

journal_name

J Addict Med

authors

Czoty PW,Gage HD,Nader SH,Reboussin BA,Bounds M,Nader MA

doi

10.1097/ADM.0b013e318045c038

subject

Has Abstract

pub_date

2007-03-01 00:00:00

pages

33-9

issue

1

eissn

1932-0620

issn

1935-3227

pii

01271255-200703000-00007

journal_volume

1

pub_type

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