Solar ultraviolet longwave UVA1 exposure of human skin has short-term consequences at cellular and molecular level, leading at long-term to photoaging.

Following exposure, reactive oxygen species (ROS) are generated, inducing oxidative stress that might impair cellular metabolic activity.

However, the dynamic of UVA1 impact on cellular metabolism remains unknown because of lacking adequate live imaging techniques.

Here we assess overtime the UVA1- induced metabolic stress response in reconstructed human skin with multicolor two-photon fluorescence lifetime microscopy (FLIM).

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