Abstract
An intricate interplay of complex spatio-temporal events underlies brain functions. Therefore, clarifying these dynamic processes is indispensable for revealing the mechanisms of brain functions. Fluorescence imaging is a powerful technique for visualizing cellular and molecular dynamics in the brain. Recent developments in fluorescent indicators and specialized optics have advanced research in the field of neuroscience. In this review, I will exemplify the power and beauty of fluorescence imaging by discussing my work focusing on the molecular dynamics of metabotropic glutamate receptor (mGluR) signaling at the synapse. By developing novel fluorescent indicators for glutamate, inositol 1,4,5-trisphosphate and Ca2+ within the endoplasmic reticulum, I succeeded in imaging the spatio-temporal dynamics of synaptic mGluR signaling, which led to the identification of novel mechanisms of mGluR-mediated glutamatergic neurotransmission. These discoveries highlight the importance of the development and application of novel fluorescence imaging techniques for the investigation of brain functions.
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