Title
Images of organoids, brain slices and in the brains of mice using minimally invasive optical clearing media, SeeDB-Live
Description
Tissue clearing has been widely used for fluorescence imaging of fixed tissues, but its application to live tissues has been limited by toxicity. Here the authors develop minimally invasive optical clearing media for fluorescence imaging of live mammalian tissues. Light scattering is minimized by adding spherical polymers with low osmolarity to the extracellular medium. A clearing medium containing bovine serum albumin (SeeDB-Live) is compatible with live cells, enabling structural and functional imaging of live tissues, such as spheroids, organoids, acute brain slices and the mouse brains in vivo. SeeDB-Live minimally affects neuronal electrophysiological properties and sensory responses in vivo, and facilitates fluorescence imaging of deep cortical layers in live animals without detectable toxicity to neurons or behavior. They further demonstrate its utility to epifluorescence voltage imaging in acute brain slices and in vivo preparations. Thus, SeeDB-Live expands both the depth and modality range of fluorescence imaging in live mammalian tissues.
Funding Information
This work was supported by grants from CREST program (JPMJCR2021 to T.I.), FOREST Program (JPMJFR230P to S.I.) of the Japan Science and Technology Agency (JST), AMED (JP23wm0525012 to T.I., JP25wm0625128 to T.I. and S.I., JP19dm0207080 to K.K., JP19dm0207079 to S.M., JP23gm6510022 and JP24wm0625119 to M.S.), the JSPS KAKENHI (JP21H00205, JP21H05696, JP23H02577, JP23H04236, JP23K18165, JP24H02308 and JP24H02312 to T.I., JP21H02140, JP22K18373 and JP24K01702 to S.I., JP19K06886 and JP24K02132 to S.F., JP22K06446, JP22H05094, JP24H01289 and JP25K02560 to N.N.-T., JP22H05161, JP22H00460 and JP23K18161 to K.K., JP22H02718 to S.M., JP24K18240 and JP25H02500 to T.Y., JP23K06151 to Y.K., JP20K23378 to T.K.S., JP24H00861 and JP25K21772 to M.S., JP25KJ1906 to H.T.), Kagoshima University Megumikai Medical Research Promotion Fund (to Y.T.), World Premier International Research Center Initiative (WPI-PRIMe; to K.H.), the Mochida Memorial Foundation for Medical and Pharmaceutical Research and the Uehara Memorial Foundation (to T.I.).