Photolysis of a Caged, Fast-Equilibrating Glutamate Receptor Antagonist, MNI-Caged γ-D-Glutamyl-Glycine, to Investigate Transmitter Dynamics and Receptor Properties at Glutamatergic Synapses
作者:Francisco Palma-Cerda、George Papageorgiou、Boris Barbour、Céline Auger、David Ogden
DOI:10.3389/fncel.2018.00465
日期:——
Fast uncaging of low affinity competitive receptor antagonists can in principle measure the timing and concentration dependence of transmitter action at receptors during synaptic transmission. Here, we describe the development, synthesis and characterization of MNI-caged γ-D-glutamyl-glycine (γ-DGG), which combines the fast photolysis and hydrolytic stability of nitroindoline cages with the well-characterized
低亲和力竞争受体拮抗剂的快速解开原理上可以测量突触传递过程中受体的递质作用的时间和浓度依赖性。在这里,我们描述了MNI笼罩的γ-D-谷氨酰-甘氨酸(γ-DGG)的开发,合成和表征,它结合了硝基吲哚笼的快速光解和水解稳定性与特征明确的快速平衡的竞争性谷氨酸受体拮抗剂γ-DGG。在攀爬的浦肯野细胞(CF-PC)突触中,MNI笼蔽的γ-DGG的浓度最高为5 mM,而不会影响CF-PC的传播,从而允许在1毫秒内宽范围释放高达1.5 mM的γ-DGG。野外手电筒的光解作用。在稳态条件下,以0.55-1.7 mM释放光的γ-DGG分别将CF第一和第二对EPSC抑制了30%和60%,与报道的镀浴γ-DGG值相似。L异构体MNI笼罩的γ-L-谷氨酰-甘氨酸的光解作用无效。通过在第二个EPSC中CF刺激后以规定的时间间隔对MNI笼蔽的γ-DGG进行定时光解,研究了突触释放的谷氨酸激活受体的时程。刺激前和刺激