Zhu, D.D.ZhuFeng, L.L.FengFeliu, N.N.FeliuGuse, A.H.A.H.GuseParak, W.J.W.J.Parak2022-03-062022-03-062021https://publica.fraunhofer.de/handle/publica/26879910.1002/adma.2020082612-s2.0-85105082675A methodology is described that allows for localized Ca2+ release by photoexcitation. For this, cells are loaded with polymer capsules with integrated plasmonic nanoparticles, which reside in endo-lysosomes. The micrometer-sized capsules can be individually excited by near-infrared light from a light pointer, causing photothermal heating, upon which there is a rise in the free cytosolic Ca2+ concentration ([Ca2+]i). The [Ca2+]i can be analyzed with a Ca2+ indicator fluorophore. In this way, it is possible to excite local lysosomal Ca2+ release in a desired target cell.en668620journal article