Department of Psychiatry and Psychotherapy, Division of Biological Psychiatry, Medical University of Vienna, Vienna, Austria.
Int J Eat Disord. 2012 Mar;45(2):263-71. doi: 10.1002/eat.20937. Epub 2011 May 3.
Genetic, pharmacologic, and physiological data suggest that individuals with anorexia nervosa (AN) have altered striatal dopamine (DA) function.
We used an amphetamine challenge and positron emission tomography [(11) C]raclopride paradigm to explore DA striatal transmission in 10 recovered (REC) AN compared with 9 control women (CW).
REC AN and CW were similar for baseline, postamphetamine [(11) C]raclopride binding potential (BP(ND) ) and change (Δ) in BP(ND) for all regions. In CW, ventral striatum Δ BP(ND) was associated with euphoria (r = -0.76; p = 0.03), which was not found for REC AN. Instead, REC AN showed a significant relationship between anxiety and Δ BP(ND) in the precommissural dorsal caudate (r = -0.62, p = 0.05).
REC AN have a positive association between endogenous DA release and anxiety in the dorsal caudate. This finding could explain why food-related DA release produces anxiety in AN, whereas feeding is pleasurable in healthy participants.
遗传、药理学和生理学数据表明,神经性厌食症(AN)患者纹状体多巴胺(DA)功能发生改变。
我们使用安非他命挑战和正电子发射断层扫描[(11)C]raclopride 范式,探究 10 名已康复的 AN 患者(REC AN)和 9 名对照女性(CW)的纹状体 DA 传递。
REC AN 和 CW 在基线、安非他命后[(11)C]raclopride 结合潜能(BP(ND))以及所有区域的 BP(ND)变化(Δ)方面相似。在 CW 中,腹侧纹状体 Δ BP(ND)与欣快感呈负相关(r = -0.76;p = 0.03),但在 REC AN 中并未发现这种相关性。相反,REC AN 显示前连合背侧尾状核的焦虑与 Δ BP(ND)之间存在显著关系(r = -0.62,p = 0.05)。
REC AN 的背侧尾状核内内源性 DA 释放与焦虑呈正相关。这一发现可以解释为什么与食物相关的 DA 释放会在 AN 中引起焦虑,而在健康参与者中进食则是愉悦的。