Cain Chris K, Blouin Ashley M, Barad Mark
Interdepartmental Program in Neuroscience, University of California, Los Angeles, Los Angeles, California 90095-1761, USA.
J Neurosci. 2002 Oct 15;22(20):9113-21. doi: 10.1523/JNEUROSCI.22-20-09113.2002.
It has been shown recently that extinction of conditional fear does not depend acutely on NMDA-type glutamate receptors, although other evidence has led to the hypothesis that L-type voltage-gated calcium channels (LVGCCs) play a role in conditional fear. We therefore tested the role of LVGCCs in the acquisition, expression, and extinction of conditional fear of cue and context in mice. Using systemic injections of two LVGCC inhibitors, nifedipine and nimodipine, which both effectively cross the blood-brain barrier, we show that LVGCCs are essential for the extinction, but not for the acquisition or expression, of conditional fear in mice.
最近有研究表明,条件性恐惧的消退并不急性依赖于NMDA型谷氨酸受体,尽管其他证据提出了L型电压门控钙通道(LVGCCs)在条件性恐惧中起作用的假说。因此,我们测试了LVGCCs在小鼠对线索和环境的条件性恐惧的获得、表达及消退中的作用。通过全身注射两种能有效穿过血脑屏障的LVGCC抑制剂硝苯地平和尼莫地平,我们发现LVGCCs对小鼠条件性恐惧的消退至关重要,但对其获得或表达并非如此。