Cocaine abusers show a blunted response to alcohol intoxication in limbic brain regions

Nora D. Volkow, Gene Jack Wang, Joanna S. Fowler, Dinko Franceschi, Panayotis K. Thanos, Christopher Wong, Samuel J. Gatley, Yu Shin Ding, Patricia Molina, David Schlyer, David Alexoff, Robert Hitzemann, Naomi Pappas

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

Cocaine and alcohol are frequently used simultaneously and this combination is associated with enhanced toxicity. We recently showed that active cocaine abusers have a markedly enhanced sensitivity to benzodiazepines. Because both benzodiazepines and alcohol facilitate GABAergic neurotransmission we questioned whether cocaine abusers would also have an enhanced sensitivity to alcohol that could contribute to the toxicity. In this study we compared the effects of alcohol (0.75 g/kg) on regional brain glucose metabolism between cocaine abusers (n=9) and controls (n=10) using PET and FDG. Alcohol significantly decreased whole brain metabolism and this effect was greater in controls (26 ± 6%) than in abusers (17 ± 10 %) even though they had equivalent levels of alcohol in plasma. Analysis of the regional measures showed that cocaine abusers had a blunted response to alcohol in limbic regions, cingulate gyrus, medial frontal and orbitofrontal cortices. Conclusions: The blunted response to alcohol in cocaine abusers contrasts with their enhanced sensitivity to benzodiazepines suggesting that targets other than GABA-benzodiazepine receptors are involved in the blunted sensitivity to alcohol and that the toxicity from combined cocaine-alcohol use is not due to an enhanced sensitivity to alcohol in cocaine abusers. The blunted response to alcohol in limbic regions and in cortical regions connected to limbic areas could result from a decreased sensitivity of reward circuits in cocaine abusers. (C) 2000 Elsevier Science Inc.

Original languageEnglish (US)
JournalLife Sciences
Volume66
Issue number12
StatePublished - Feb 11 2000
Externally publishedYes

Fingerprint

Alcoholic Intoxication
Cocaine
Brain
Alcohols
Benzodiazepines
Toxicity
Metabolism
Gyrus Cinguli
Frontal Lobe
GABA-A Receptors
Prefrontal Cortex
Reward
Synaptic Transmission

Keywords

  • Brain glucose metabolism
  • Drug addiction
  • Neurotoxicity
  • Positron emission tomography
  • Reward

ASJC Scopus subject areas

  • Pharmacology

Cite this

Volkow, N. D., Wang, G. J., Fowler, J. S., Franceschi, D., Thanos, P. K., Wong, C., ... Pappas, N. (2000). Cocaine abusers show a blunted response to alcohol intoxication in limbic brain regions. Life Sciences, 66(12).

Cocaine abusers show a blunted response to alcohol intoxication in limbic brain regions. / Volkow, Nora D.; Wang, Gene Jack; Fowler, Joanna S.; Franceschi, Dinko; Thanos, Panayotis K.; Wong, Christopher; Gatley, Samuel J.; Ding, Yu Shin; Molina, Patricia; Schlyer, David; Alexoff, David; Hitzemann, Robert; Pappas, Naomi.

In: Life Sciences, Vol. 66, No. 12, 11.02.2000.

Research output: Contribution to journalArticle

Volkow, ND, Wang, GJ, Fowler, JS, Franceschi, D, Thanos, PK, Wong, C, Gatley, SJ, Ding, YS, Molina, P, Schlyer, D, Alexoff, D, Hitzemann, R & Pappas, N 2000, 'Cocaine abusers show a blunted response to alcohol intoxication in limbic brain regions', Life Sciences, vol. 66, no. 12.
Volkow ND, Wang GJ, Fowler JS, Franceschi D, Thanos PK, Wong C et al. Cocaine abusers show a blunted response to alcohol intoxication in limbic brain regions. Life Sciences. 2000 Feb 11;66(12).
Volkow, Nora D. ; Wang, Gene Jack ; Fowler, Joanna S. ; Franceschi, Dinko ; Thanos, Panayotis K. ; Wong, Christopher ; Gatley, Samuel J. ; Ding, Yu Shin ; Molina, Patricia ; Schlyer, David ; Alexoff, David ; Hitzemann, Robert ; Pappas, Naomi. / Cocaine abusers show a blunted response to alcohol intoxication in limbic brain regions. In: Life Sciences. 2000 ; Vol. 66, No. 12.
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