Striatal dopamine D2 receptor availability predicts the thalamic and medial prefrontal responses to reward in cocaine abusers three years later
Low levels of dopamine (DA) D2 receptor availability at a resting baseline have been previously reported in drug addicted individuals and have been associated with reduced ventral and dorsal prefrontal metabolism. The reduction in DA D2 receptor availability along with the reduced ventral frontal me...
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Published in | Synapse (New York, N.Y.) Vol. 64; no. 5; pp. 397 - 402 |
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Main Authors | , , , , , , , , , |
Format | Journal Article |
Language | English |
Published |
Hoboken
Wiley Subscription Services, Inc., A Wiley Company
01.05.2010
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Subjects | |
Online Access | Get full text |
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Summary: | Low levels of dopamine (DA) D2 receptor availability at a resting baseline have been previously reported in drug addicted individuals and have been associated with reduced ventral and dorsal prefrontal metabolism. The reduction in DA D2 receptor availability along with the reduced ventral frontal metabolism is thought to underlie compromised sensitivity to nondrug reward, a core characteristic of drug addiction. We therefore hypothesized that variability in DA D2 receptor availability at baseline will covary with dynamic responses to monetary reward in addicted individuals. Striatal DA D2 receptor availability was measured with [11C]raclopride and positron emission tomography and response to monetary reward was measured (an average of three years later) with functional magnetic resonance imaging in seven cocaine‐addicted individuals. Results show that low DA D2 receptor availability in the dorsal striatum was associated with decreased thalamic response to monetary reward; while low availability in ventral striatum was associated with increased medial prefrontal (Brodmann Area 6/8/32) response to monetary reward. These preliminary results, that need to be replicated in larger sample sizes and validated with healthy controls, suggest that resting striatal DA D2 receptor availability predicts variability in functional responses to a nondrug reinforcer (money) in prefrontal cortex, implicated in behavioral monitoring, and in thalamus, implicated in conditioned responses and expectation, in cocaine‐addicted individuals. Synapse 64:397–402, 2010. © 2009 Wiley‐Liss, Inc. |
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Bibliography: | National Institute on Drug Abuse - No. 1R01DA023579; No. R21DA02062 istex:6235F3BEB7DD5D400C468DABB02C71E8C4F3036B RTA (Red de Transtornos Adictivos) program from Instituto de Salud Carlos III - No. RETICS RD06/0001/0032 General Clinical Research Center - No. 5-MO1-RR-10,710 Ministerio de Ciencia e Innovación Spain - No. SAF2007-66,801 Laboratory Directed Research and Development from U.S. Department of Energy (OBER) ArticleID:SYN20741 ark:/67375/WNG-JD6MZ72X-W ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23 BNL-91381-2010-JA DE-AC02-98CH10886 DOE - OFFICE OF SCIENCE |
ISSN: | 0887-4476 1098-2396 1098-2396 |
DOI: | 10.1002/syn.20741 |