کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4323567 1613800 2016 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Cocaine and methamphetamine induce opposing changes in BOLD signal response in rats
موضوعات مرتبط
علوم زیستی و بیوفناوری علم عصب شناسی علوم اعصاب (عمومی)
پیش نمایش صفحه اول مقاله
Cocaine and methamphetamine induce opposing changes in BOLD signal response in rats
چکیده انگلیسی


• Initial intravenous administration of methamphetamine and cocaine provoked regionally specific cerebral metabolic activity.
• Methamphetamine provoked a sustained negative BOLD signal in brain regions implicated in drug seeking.
• Cocaine produced a transient positive BOLD signal change.

BackgroundNeuroimaging studies in psychostimulant addicts have reported functional neural activity changes in brain regions involved in relapse. However, the difference between the effects of the psychostimulants methamphetamine and cocaine on neuronal activity in a similar setting not been clarified. Since studies in humans are limited by the inability to study the initial impact of psychostimulant drugs, we addressed this issue in a rat model.ObjectiveHere, we report methamphetamine and cocaine-induced blood-oxygen-level dependent (BOLD) signal change using functional magnetic resonance imaging (fMRI) in rats receiving drug for the first time during the imaging session.MethodsTwenty-three male Long Evans rats underwent fMRI imaging and received an intravenous infusion of methamphetamine, cocaine, or saline. Anatomical and pharmacological fMRI (pfMRI) were performed on a 7T BioSpec dedicated research MR scanner under isoflurane gas (1.5–2%). After collecting baseline data for 10 min, rats received drug over the next 10 min for a total 40 min scan time. Data were then preprocessed and statistically analyzed in anatomically defined regions of interest (ROIs) that have been implicated in persistent drug seeking and relapse.ResultsMethamphetamine during the imaging session resulted in a sustained negative BOLD signal change in key regions of the relapse circuit, except for the prefrontal cortex. In contrast, cocaine evoked a positive or unchanged BOLD signal in these same regions. In all of the investigated ROIs, there were no changes in BOLD signal following saline.ConclusionAcute methamphetamine and cocaine have distinct patterns of functional activity as measured by pfMRI.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Brain Research - Volume 1642, 1 July 2016, Pages 497–504
نویسندگان
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