RT Journal Article T1 Stimulation of stem cell niches and tissue regeneration in mouse skin by switchable protoporphyrin IX-dependent photogeneration of reactive oxygen species in situ A1 Montoya Miñano, Juan José A1 Espada, Jesús A1 Carrasco, Elisa A1 Calvo-Sánchez, María I. A1 Fernández-Martos, Sandra AB Here, we describe a protocol to induce switchable in vivo photogeneration of endogenous reactive oxygen species (ROS) in mouse skin. This transient production of ROS in situ efficiently activates cell proliferation in stem cell niches and stimulates tissue regeneration as strongly manifested through the acceleration of burn healing and hair follicle growth processes. The protocol is based on a regulatable photodynamic treatment that treats the tissue with precursors of the endogenous photosensitizer protoporphyrin IX and further irradiates the tissue with red light under tightly controlled physicochemical parameters. Overall, this protocol constitutes an interesting experimental tool to analyze ROS biology. PB JoVE YR 2020 FD 2020-05-08 LK https://hdl.handle.net/20.500.14352/115011 UL https://hdl.handle.net/20.500.14352/115011 LA eng NO Espada, J., Carrasco, E., Calvo-Sánchez, M. I., Fernández-Martos, S., Montoya, J. J. Stimulation of Stem Cell Niches and Tissue Regeneration in Mouse Skin by Switchable Protoporphyrin IX-Dependent Photogeneration of Reactive Oxygen Species In Situ. J. Vis. Exp. (159), e60859, doi:10.3791/60859 (2020). NO Ministerio de Economía y Competitividad NO Instituto de Salud Carlos III NO Comunidad de Madrid NO Universidad Autónoma de Madrid DS Docta Complutense RD 10 abr 2025