Derauf Chris, Kekatpure Minal, Neyzi Nurunisa, Lester Barry, Kosofsky Barry
John A. Burns School of Medicine, University of Hawaii, Honolulu, HI, USA.
Semin Cell Dev Biol. 2009 Jun;20(4):441-54. doi: 10.1016/j.semcdb.2009.03.001. Epub 2009 Mar 13.
Recent advances in MR-based brain imaging methods have provided unprecedented capabilities to visualize the brain. Application of these methods has allowed identification of brain structures and patterns of functional activation altered in offspring of mothers who used licit (e.g., alcohol and tobacco) and illicit (e.g., cocaine, methamphetamine, and marijuana) drugs during pregnancy. Here we review that literature, which though somewhat limited by the complexities of separating the specific effects of each drug from other confounding variables, points to sets of interconnected brain structures as being altered following prenatal exposure to drugs of abuse. In particular, dopamine-rich cortical (e.g., frontal cortex) and subcortical (e.g., basal ganglia) fetal brain structures show evidence of vulnerability to intrauterine drug exposure suggesting that during brain development drugs of abuse share a specific profile of developmental neurotoxicity. Such brain malformations may shed light on mechanisms underlying prenatal drug-induced brain injury, may serve as bio-markers of significant intrauterine drug exposure, and may additionally be predictors of subsequent neuro-developmental compromise. Wider clinical use of these research-based non-invasive methods will allow for improved diagnosis and allocation of therapeutic resources for affected infants, children, and young adults.
基于磁共振成像的脑成像方法的最新进展为可视化大脑提供了前所未有的能力。应用这些方法能够识别在孕期使用合法药物(如酒精和烟草)及非法药物(如可卡因、甲基苯丙胺和大麻)的母亲所生后代中发生改变的脑结构和功能激活模式。在此,我们回顾这方面的文献,尽管将每种药物的特定影响与其他混杂变量区分开来存在一定复杂性,导致相关研究有所局限,但这些文献指出,产前暴露于滥用药物后,相互关联的脑结构会发生改变。特别是,富含多巴胺的胎儿大脑皮质结构(如额叶皮质)和皮质下结构(如基底神经节)显示出易受宫内药物暴露影响的迹象,这表明在大脑发育过程中,滥用药物具有特定的发育神经毒性特征。此类脑畸形可能有助于揭示产前药物所致脑损伤的潜在机制,可作为宫内大量药物暴露的生物标志物,还可能是后续神经发育受损的预测指标。更广泛地临床应用这些基于研究的非侵入性方法,将有助于改善对受影响婴儿、儿童和青年的诊断及治疗资源分配。