title: Abuse of amphetamines and structural abnormalities in the brain.
abstract: We review evidence that structural brain abnormalities are associated with abuse of amphetamines. A brief history of amphetamine use/abuse and evidence for toxicity is followed by a summary of findings from structural magnetic resonance imaging (MRI) studies of human subjects who had abused amphetamines and children who were exposed to amphetamines in utero. Evidence comes from studies that used a variety of techniques including manual tracing, pattern matching, voxel-based, tensor-based, or cortical thickness mapping, quantification of white matter signal hyperintensities, and diffusion tensor imaging. Ten studies compared controls to individuals who were exposed to methamphetamine. Three studies assessed individuals exposed to 3-4-methylenedioxymethamphetamine (MDMA). Brain structural abnormalities were consistently reported in amphetamine abusers, as compared to control subjects. These included lower cortical gray matter volume and higher striatal volume than control subjects. These differences might reflect brain features that could predispose to substance dependence. High striatal volumes might also reflect compensation for toxicity in the dopamine-rich basal ganglia. Prenatal exposure was associated with striatal volume that was below control values, suggesting that such compensation might not occur in utero. Several forms of white matter abnormality are also common and may involve gliosis. Many of the limitations and inconsistencies in the literature relate to techniques and cross-sectional designs, which cannot infer causality. Potential confounding influences include effects of pre existing risk/protective factors, development, gender, severity of amphetamine abuse, abuse of other drugs, abstinence, and differences in lifestyle. Longitudinal designs in which multimodal datasets are acquired and are subjected to multivariate analyses would enhance our ability to provide general conclusions regarding the associations between amphetamine abuse and brain structure.
authors.affiliation: Psychiatry and Biobehavioral Sciences, David Geffen School of Medicine, University of California Los Angeles, Los Angeles, CA 90024-1759, USA.
authors.forename: Steven
authors.initials: S
authors.lastname: Berman
authors.forename: Joseph
authors.initials: J
authors.lastname: O'Neill
authors.forename: Scott
authors.initials: S
authors.lastname: Fears
authors.forename: George
authors.initials: G
authors.lastname: Bartzokis
authors.forename: Edythe D
authors.initials: ED
authors.lastname: London
mesh_terms: D000014:Abnormalities, Drug-Induced / Q000209:etiology; D000328:Adult; D019969:Amphetamine-Related Disorders / Q000473:pathology*; D000662:Amphetamines / Q000009:adverse effects* / Q000627:therapeutic use / Q000633:toxicity; D000818:Animals; D001289:Attention Deficit Disorder with Hyperactivity / Q000188:drug therapy / Q000473:pathology; D001921:Brain / Q000002:abnormalities / Q000187:drug effects / Q000473:pathology*; D002415:Cats; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D008694:Methamphetamine / Q000633:toxicity; D009186:Myelin Sheath / Q000187:drug effects / Q000473:pathology; D018817:N-Methyl-3,4-methylenedioxyamphetamine / Q000633:toxicity; D009474:Neurons / Q000187:drug effects; D018377:Neurotransmitter Agents / Q000378:metabolism; D011247:Pregnancy; D011297:Prenatal Exposure Delayed Effects; D011323:Primates; D051381:Rats; D013045:Species Specificity
chemical_list: D000662:Amphetamines; D018377:Neurotransmitter Agents; D008694:Methamphetamine; D018817:N-Methyl-3,4-methylenedioxyamphetamine