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分子级功能性磁共振成像对多巴胺激应信号的成像

Taekwan Lee¹, Lili X Cai, Victor S Lelyveld

¹Department of Biological Engineering, Massachusetts Institute of Technology (MIT), Cambridge, MA 02139, USA.

Science (New York, N.Y.)

|May 3, 2014

概括

研究人员开发了分子功能性MRI (fMRI) 来绘制大脑中多巴胺释放的地图. 这种新的技术精确地测量了神经递质活性,为奖励通路和大脑电路提供了新的见解.

科学领域:

神经科学是一个神经科学.
医疗成像医学成像
神经化学神经化学

背景情况:

绘制大脑活动的地图对于理解神经功能至关重要.
目前的功能性MRI (fMRI) 缺乏分子特异性.
多巴胺在奖励和激励中发挥着关键作用.

研究的目的:

为了展示一种新的分子功能性MRI (fMRI) 技术.
为了将分子特异性与空间覆盖相结合,用于大脑活动映射.
为了量化多巴胺释放的回应奖励相关的刺激.

主要方法:

开发了一种可以通过MRI检测的神经递质传感器.
利用分子fMRI测量大鼠的多巴胺释放.
应用横向的下丘脑大脑刺激来唤起多巴胺释放.

主要成果:

实现了多巴胺释放的时间解析体积测量.
在前核中确定了多巴胺度峰值和释放率.
在尾部大脑区域观察到多巴胺过渡物和与刺激坐标相关的释放幅度.

结论:

分子fMRI技术成功地绘制了高特异性和覆盖范围的多巴胺释放.
脑下垂体电路调节多巴胺反应,表明其在奖励途径中的作用.
这项工作为神经科学研究中的定量分子fMRI奠定了基础.

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