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Updated: Jun 6, 2026
A Macrophage-Tumor Spheroid Co-Invasion Assay
Published on: January 24, 2025
Innovative immunohistochemistry identifies MMP-9 expressing macrophages at the invasive front of murine HCC
Martin Roderfeld1, Timo Rath, Frank Lammert
1Martin Roderfeld, Timo Rath, Elke Roeb, Justus-Liebig-University Giessen, Department of Medicine II, Gastroenterology, Giessen 35385, Germany.
Aim:
To investigate the proteolytic contribution of tumor-associated macrophages (TAM) in tumor invasion, we analyzed whether TAM at the invasive front of small HCC in Abcb4(-/-)-mice show an enhanced expression of MMP-9.
Methods:
Liver cryosections of the hepatocellular carcinoma (HCC) invasive front from 12 mo old Abcb4(-/-)-mice were stained for collagen type I and MMP-9 using Alexa488 and Alexa568 labeled secondary antibodies. Afterwards, the Alexa568 dye was bleached and the macrophage marker F4/80 was visualized using Alexa568 labeled secondary antibodies. Finally, photographs of the invasive tumor front were digitally overlaid and analyzed.
Results:
After complete bleaching of the primary dye, specific fluorescence staining of a third antigen, here F4/80, was successfully performed on the same histological section. With this method, we were able to identify conglomerates of matrix metalloproteinase (MMP-9) expressing macrophages within the tumor capsule of HCC.
Conclusion:
MMP-9 expressing macrophages are involved in matrix remodelling at the invasive tumor front of HCC. The described staining protocol provides a simple yet powerful extension of conventional immuno-histochemistry, facilitating visualization of at least three different antigens plus nuclei in one single histological section.
Insights
Tumor-associated macrophages (TAM) expressing matrix metalloproteinase-9 (MMP-9) are present at the invasive front of hepatocellular carcinoma (HCC). This finding highlights TAM
Area of Science:
- Immunohistochemistry
- Tumor Microenvironment
- Hepatocellular Carcinoma (HCC) Research
Background:
- Tumor-associated macrophages (TAM) play a role in cancer progression.
- Matrix metalloproteinase-9 (MMP-9) is implicated in tumor invasion and matrix remodeling.
- Understanding TAM involvement in HCC invasion is crucial for therapeutic strategies.
Purpose of the Study:
- To investigate the proteolytic contribution of TAM in tumor invasion.
- To determine if TAM at the invasive front of HCC in Abcb4(-/-)-mice exhibit enhanced MMP-9 expression.
Main Methods:
- Analysis of liver cryosections from Abcb4(-/-)-mice with HCC.
- Multi-antigen staining protocol involving collagen type I, MMP-9, and F4/80 (macrophage marker).
- Sequential fluorescent staining with dye bleaching and digital image analysis of the invasive tumor front.
Main Results:
- Successful visualization of at least three antigens plus nuclei in a single histological section.
- Identification of MMP-9 expressing macrophage conglomerates within the tumor capsule of HCC.
- Demonstration of MMP-9 expression by macrophages at the invasive tumor front.
Conclusions:
- MMP-9 expressing macrophages are integral to matrix remodeling at the invasive HCC tumor front.
- The developed staining protocol is an effective extension of conventional immunohistochemistry for multi-antigen visualization.
- This method facilitates detailed analysis of the tumor microenvironment in HCC.
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