Four-color staining combining fluorescence and brightfield microscopy for simultaneous immune cell phenotyping and

Ronald L P van Vlierberghe1, Maro H Sandel, Frans A Prins

  • 1Department of Surgery, Leiden University Medical Centre, Leiden, the Netherlands.

Insights

Researchers developed a novel microscopy technique to simultaneously identify multiple immune cell markers and tumor markers in a single tissue section, enhancing the study of tumor-infiltrating immune cells.

Area of Science:

  • Oncology
  • Immunology
  • Microscopy

Background:

  • Immune-cell infiltration is common in human solid tumors, crucial for understanding antitumor responses.
  • Conventional staining methods (hematoxylin/eosin, immunohistochemistry) have limitations in multiplexing markers per section.
  • Detailed analysis of immune cell phenotype and location within tumors is challenging.

Purpose of the Study:

  • To develop an advanced microscopy technique for simultaneous multiparameter analysis of tumor-infiltrating immune cells.
  • To overcome the limitations of conventional staining methods in identifying multiple markers.
  • To enable detailed study of immune cell phenotype and location in colorectal tumors.

Main Methods:

  • Developed a combined immunofluorescence and immunogold-silver staining technique.
  • Utilized a two-step staining protocol with antibodies selected for minimal cross-reactivity.
  • Selected secondary fluorescent antibody conjugates for minimal spectral overlap.
  • Integrated brightfield and fluorescence microscopy images for computer-assisted analysis.

Main Results:

  • Successfully discriminated three leukocyte markers and one tumor marker simultaneously in a single tissue section.
  • Enabled detailed analysis of both phenotype and location of infiltrating immune cells.
  • Demonstrated a powerful tool for multiparameter microscopic analysis of formalin-fixed, paraffin-embedded tissues.

Conclusions:

  • The developed combined microscopy technique offers a significant advancement for studying tumor-immune cell infiltration.
  • This method allows for more comprehensive analysis of immune cell populations within solid tumors.
  • It provides a powerful tool for detailed multiparameter microscopic analysis in various tissue types.