Oxygen is a crucial parameter for organotypic in vitro-cultures which
are still performed under ambient atmosphere supplemented with 5 %
CO2. This can lead to hyperoxia with its associated effects on signaling
cascades and their effects on cellular behavior. Here, we describe a
platform that enables real-time, label-free, optical oxygen (gradient)
measurements in organotypic 3D-/organoid cultures thus allowing for
physioxic culture and assay conditions in e. g. mito stress tests and
substance testing