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White and Clearing: New Optical Tissue Clearing Method

Llorente, V.; Fernandez-Cortes, E.; Sanderson, D.; Salazar, J.; Ripoll, J.; Desco, M.; Gomez-Gaviro, M. V.

2025-02-04 physiology
10.1101/2025.01.30.635653 bioRxiv
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AbstractOptical tissue clearing techniques can render large-scale tissue samples and whole organs transparent to apply cell-resolution 3D imaging techniques, revolutionizing the fields of biological research and pathological diagnosis, and providing never-before seen structural information. There are several widely used protocols, but they have shortcomings, both in complexity of use and in suboptimal results in certain tissues and organs. Here, we describe a new method dubbed "White and Clear" (WaC) using 2,2-thiodiethanol (TDE) as a dynamic Refractive Index (RI)-matching reagent alongside a lipid-extraction and a pigment-bleaching step using dilute hydrogen peroxide (H2O2), to provide ease of use and enhanced clearing effect on all kinds of samples and allow for the clearing parameters to be finely adjusted in order to obtain the best results in each situation.

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