Optimisation of multiplex immunofluorescence for a non-spectral fluorescence scanning system

Area of Science:

• Biomedical Sciences
• Immunology
• Pathology

Background:

• Multiplex immunofluorescence (IF) is increasingly used for detailed tissue analysis, offering more complex information than traditional immunohistochemistry (IHC).
• Many IF kits require specialized multispectral imaging systems, limiting accessibility for numerous research groups.
• Standardizing multiplex IF assays for common laboratory equipment is crucial for broader adoption.

Purpose of the Study:

• To develop and optimize two 5-color IF panels for T cell characterization in human colorectal tissue.
• To demonstrate the feasibility of using a non-spectral fluorescence slide scanner for multiplex IF imaging.
• To provide guidance on assay development and considerations for multiplex IF with standard imaging systems.

Main Methods:

• Design and validation of two distinct 5-color IF panels targeting T cell markers.
• Optimization of antibody concentrations, incubation times, and blocking strategies.
• Imaging of stained colorectal tissue sections using a non-spectral fluorescence slide scanner with standard band-pass filters.

Main Results:

• Successful simultaneous detection of five different markers on single tissue sections.
• Demonstration of T cell subset identification and spatial distribution within colorectal tissue.
• Establishment of reproducible staining protocols adaptable to non-spectral imaging.

Conclusions:

• Multiplex IF assays can be effectively developed and implemented using non-spectral fluorescence slide scanners.
• The presented 5-color panels provide a valuable tool for T cell immunophenotyping in colorectal cancer research.
• This approach enhances the accessibility of advanced multiplex IF techniques for researchers with limited specialized equipment.