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Updated: May 21, 2025

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An Aptamer-based Sensor for Unchelated GadoliniumIII
Published on: January 9, 2017
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由加多引起的突触传输的度依赖的双向修饰和基于加多的对比剂的不良影响
Odgerel Zorigt1, Hiroki Yasuda2,3, Takahito Nakajima1,4
1Department of Diagnostic Radiology and Nuclear Medicine, Gunma University Graduate School of Medicine, Maebashi, Gunma 371-8511, Japan.
概括
来自MRI对比剂的加多会影响大脑突触功能,在低度和高度下改变传输. 像Gd-GOTA这样的宏循环剂比像Gd-DTPA这样的线性剂更安全,它可能不会完全化加多.
科学领域:
- 神经科学是一个神经科学.
- 药理学 药理学是指药理学的学科.
- 生物化学 生物化学
背景情况:
- 在MRI中使用的基于加多的对比剂 (GBCA) 可以将加多沉积在脑组织中.
- 加多对突触功能及其机制的确切影响仍然不清楚.
研究的目的:
- 为了研究加多对小鼠海马体突触传播的影响.
- 阐明加多对突触功能的影响背后的度依赖机制.
主要方法:
- 在小鼠海马片中,电生理学记录唤起和自发突触传输 (fEPSPs和mEPSCs).
- 不同度的加多和特定的GBCA (Gd-GOTA,Gd-DTPA) 的应用.
- 使用受体对抗剂 (mGluR,eCB,P2Y1R,NMDAR,P2Y13R抑制剂) 的药理学操纵.
主要成果:
- 低度的加多 (100μM) 强化唤起了突触传输,并增加了自发的微型刺激后突触电流 (mEPSC) 频率.
- 高度的加多诱导的长期抑郁 (LTD) 通过前突触 (mGluR,eCB,P2Y1R依赖) 和后突触 (P2Y13R依赖) 机制.
- 宏循环GBCA (Gd-GOTA) 没有影响,而线性GBCA (Gd-DTPA) 在100μM时增强了引起的EPSC,表明化不完全.
结论:
- 加多以度依赖的方式差异调节唤起和自发的突触传输.
- 像Gd-DTPA这样的线性GBCA可能会由于 incomplete gadolinium 化而带来风险,可能会影响大脑功能.
- 宏循环GBCA在突触传输效应方面似乎更安全.
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