Publication

Abstract : Cellular optogenetics is a revolutionary technique that leverages light-sensitive proteins to manipulate cellular activity. It is a promising technique that enables light to activate specific proteins called opsins, which may then be used to regulate and control various cell activities. These activities include controlling the excitability of neurons, influencing signaling pathways, regulating gene expression, and redistributing proteins. However, the capability is restricted, as visible light cannot enter brain tissue deeply. Upconversion nanoparticles (UCNPs) can absorb near-infrared (NIR) light that has less light attenuation and more tissue penetration than visible light. It is an appealing solution that may convert low-energy NIR light into higher-energy visible light, hence allowing for precise manipulation in deeper tissues. UCNPs, which consist of rare-earth-doped materials, possess specific photon upconversion capabilities. Their ability to capture low-energy photons and return photons with greater energy allows for effective tissue penetration, reducing the risk of phototoxicity and background fluorescence. Superior spatial and temporal accuracy in noninvasive cellular activity regulation is possible by combining UCNPs with optogenetic techniques. Remote regulation of gene expression, cellular signaling pathways, and neuronal activity is made possible by UCNPs conjugated to light-sensitive proteins. This chapter explains how UCNPs have revolutionized cellular optogenetics, and how they can expand our knowledge of cellular dynamics and open up new avenues for biological and medical study.