Synergistic Suppression of Cortical Spreading Depression under NR2A and NR2B Inhibition

Yiman Jia, Jiayi Zhou, Fan Bu, Minyan Wang^*

Centre for Neuroscience, Department of Biological Sciences, Xi’an Jiaotong-Liverpool University, Suzhou, China.

DOI: 10.4236/pp.2015.612059                

Abstract

Cortical spreading depression (CSD) is a transient synaptic excitation, followed by depression, which can propagate slowly across cortex, subcortex and retina. CSD is implicated in migraine with aura and may lead to migraine pain. CSD can be suppressed by inhibition of both NR2A and NR2B containing N-methyl-D-aspartic acid (NMDA) receptors. However, whether there is a synergistic effect of co-inhibition of NR2A and NR2B containing receptors on CSD remains unknown. In this study, an efficient in vitro model of migraine with intrinsic optical imaging approach was applied to address this role of co-activation of both NR2A and NR2B in CSD. The results showed that co-application of NVP-AAM077, a drug selectively targeting for NR2A and Ro 25-6981, a drug selectively targeting for NR2B containing receptors, showed synergistic inhibitory effects on propagation rate and the magnitude of CSD in a concentration dependent manner in chick retina. Inhibition of CSD propagation was also observed by a clinical acceptable drug that antagonizes both NR2A and NR2B containing receptors, memantine, at 10 μM. These data suggest that combinational use of antagonists selectively targeting NR2A and NR2B containing receptors could be a useful strategy for preventative treatment of migraine with improved efficacy with potential alleviated side effects.

Keywords

Cortical Spreading Depression, NR2A, NR2B, NVP-AAM077, Ro 25-6981, Memantine, Chick Retina

Conflicts of Interest

The authors declare no conflicts of interest.

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