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Neuroimage. 2014 Sep;98:195-202. doi: 10.1016/j.neuroimage.2014.04.061. Epub 2014 May 2.

Limbic system mGluR5 availability in cocaine dependent subjects: a high-resolution PET [(11)C]ABP688 study.

Author information

1
Department of Psychiatry, McGill University, Montreal H3A 1A1, Canada.
2
Department of Neurology & Neurosurgery, Montreal Neurological Institute, McGill University, Montreal H3A 2B4, Canada.
3
Translational Neuroimaging Laboratory, Douglas Research Institute, Montreal H4H 1R3, Canada.
4
Department of Psychiatry, McGill University, Montreal H3A 1A1, Canada; Department of Neurology & Neurosurgery, Montreal Neurological Institute, McGill University, Montreal H3A 2B4, Canada.
5
Department of Psychiatry, McGill University, Montreal H3A 1A1, Canada; Department of Neurology & Neurosurgery, Montreal Neurological Institute, McGill University, Montreal H3A 2B4, Canada; Center for Studies in Behavioral Neurobiology, Concordia University, Montreal H4B 1R6, Canada. Electronic address: marco.leyton@mcgill.ca.

Abstract

Cocaine self-administration decreases type 5 metabotropic glutamate receptor (mGluR5) tissue concentrations in laboratory rats during early abstinence. These changes are thought to influence the drug's reinforcing properties and the ability of drug-related cues to induce relapse. Here, our goal was to measure brain regional mGluR5 availability in recently abstinent cocaine dependent humans. Participants meeting DSM-IV diagnostic criteria for current cocaine dependence (n=9) were recruited from the general population. mGluR5 availability (binding potential, non-displaceable; BPND) was measured with high-resolution positron emission tomography (PET HRRT) and [(11)C]ABP688. Compared to age- and sex-matched healthy controls (n=9), cocaine dependent subjects showed significantly lower BPND values in the ventral (bilateral: -28.2%, p=0.011), associative (right: -21.4%, p=0.043), and sensorimotor striatum (bilateral: -21.7%, p=0.045), amygdala (left: -26%, p=0.046) and insula (right: -23.3%, p=0.041). Among the cocaine users, receptor availabilities were related to abstinence (range: 2 to 14days). The longer the duration of abstinence, the lower the BPND values in the sensorimotor striatum (r=-0.71, p=0.034), left amygdala (r=-0.73, p=0.026) and right insula (r=-0.67, p=0.046). Compared to healthy controls, BPND values were significantly reduced in those who tested negative for cocaine on the PET test session in the ventral (p=0.018) and sensorimotor striatum (p=0.017), left amygdala (p=0.008), and right insula (p=0.029), but not in those who tested positive. Together, these results provide evidence of time-related mGluR5 alterations in striatal and limbic regions in humans during early cocaine abstinence.

KEYWORDS:

Abstinence; Addiction; Glutamate; Positron emission tomography; Relapse; Striatum

[Indexed for MEDLINE]

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