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Updated: Jul 8, 2025
Three-Dimensional Imaging of Tumor-Bearing Tissue Using the Iterative Bleaching Extends Multiplexity Approach
Published on: April 25, 2025
Increased multiplexity in optical tissue clearing-based 3D immunofluorescence microscopy of the tumor
Abstract:
Optical tissue clearing and three-dimensional (3D) immunofluorescence (IF) microscopy have been transforming imaging of the complex tumor microenvironment (TME). However, current 3D IF microscopy has restricted multiplexity; only three or four cellular and non-cellular TME components can be localized in a cleared tumor tissue. Here we report a LED photobleaching method and its application for 3D multiplexed optical mapping of the TME. We built a high-power LED light irradiation device and temperature-controlled chamber for completely bleaching fluorescent signals throughout optically cleared tumor tissues without compromise of tissue and protein antigen integrity. With newly developed tissue mounting and selected region-tracking methods, we established a cyclic workflow involving IF staining, tissue clearing, 3D confocal microscopy, and LED photobleaching. By registering microscope channel images generated through three work cycles, we produced 8-plex image data from individual 400 μm-thick tumor macrosections that visualize various vascular, immune, and cancer cells in the same TME at tissue-wide and cellular levels in 3D. Our method was also validated for quantitative 3D spatial analysis of cellular remodeling in the TME after immunotherapy. These results demonstrate that our LED photobleaching system and its workflow offer a novel approach to increase the multiplexing power of 3D IF microscopy for studying tumor heterogeneity and response to therapy.
Insights
Researchers developed a new LED photobleaching technique to significantly enhance 3D immunofluorescence microscopy. This method allows for detailed 8-plex mapping of the tumor microenvironment (TME), improving the study of tumor heterogeneity and treatment responses.
Area of Science:
- Biomedical Imaging
- Cancer Research
- Immunohistochemistry
Background:
- Optical tissue clearing and 3D immunofluorescence (IF) microscopy are crucial for studying the tumor microenvironment (TME).
- Current 3D IF microscopy methods have limited multiplexing capabilities, restricting the analysis to only a few TME components.
- There is a need for advanced techniques to increase multiplexity in 3D imaging of cleared tissues.
Conclusions:
- The developed LED photobleaching system and workflow significantly increase the multiplexing power of 3D IF microscopy.
- This novel approach provides unprecedented insights into tumor heterogeneity and therapeutic responses by enabling detailed 3D mapping of the TME.
- The technique offers a powerful new tool for advancing cancer research and understanding complex biological systems.
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