Light-induced remote release in vivo in C. elegans from novel, silver-alginate hydrogel shells

Non-destructive, controllable, remote light-induced release inside cells enables studying time- and space- specific processes in biology. In this work we demonstrate remote release of tagged proteins in Caenorhabditis elegans (C. elegans) worms using a near-infrared laser light as a trigger from novel hydrogel shells functionalized with silver nanoparticles responsive to laser light. A new type of hydrogel shells was developed capable of withstanding prolonged storage in lyophilized state to enable the uptake of the shell by worms, which takes place on an agar plate under standard culture conditions. Uptake of the shells by C. elegans was confirmed by a confocal laser scanning microscopy, while release from alginate shells in C. elegans and the laser effect on the shells on a substrate in air was followed by fluorescence microscopy. In addition, Raman microscopy was used to track localization of particles to avoid the influence of autofluorescence. Hierarchical cluster spectral analysis is used to extract information about biochemical composition of an area of a namatode containing the hydrogel shells, whose Raman signal is enhancad by the SERS (Surface Enhanced Raman Scattering) effect due to hot spots formed by silver nanoparticles present in the shells. The in vivo release demonstrated here can be used to study intestinal microbiota and probiotic compounds as well as possible future strategy for gene delivery in the worms other insects and organisms.