Organotypic 3D Ex Vivo Co-culture Model of the Macro-metastasis/Organ Parenchyma Interface
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Updated: Jul 2, 2025
Coculture System with an Organotypic Brain Slice and 3D Spheroid of Carcinoma Cells
Published on: October 9, 2013
Raquel Blazquez1, Daniela Sparrer2, Jessica Sonbol2
1Department of Internal Medicine III, Hematology and Medical Oncology, University Hospital Regensburg, Regensburg, Germany. raquel.blazquez@ukr.de.
Abstract:
The macro-metastasis/organ parenchyma interface (MMPI) is gaining increasing significance due to its prognostic relevance for cancer (brain) metastasis. We have developed an organotypic 3D ex vivo co-culture model that mimics the MMPI and allows us to evaluate the histopathological growth pattern (HGP) and infiltration grade of the tumor cells into the neighboring brain tissue and to study the interactions of cancer and glial cells ex vivo. This system consists of a murine brain slice and a 3D tumor plug that can be co-cultured for several days. After slicing the brain of 5- to 8-day-old mice, a Matrigel plug containing fluorescent-labelled tumor cells is placed next to it, so that tumor cells in the 3D plug and glial cells in the brain slice can interact at the interface for up to 96 h. To facilitate the positioning of the co-culture and increase the reproducibility of the model, a brain spacer can be used. The HGP and infiltration of the tumor cells into the brain slice as well as the activation of the glial cells can be assessed by live and/or confocal microscopy after immunofluorescence staining of microglia and/or astrocytes. Alternatively, the co-culture can also be used for other purposes, such as RNA analysis. This organotypic 3D ex vivo co-culture offers a perfect tool for preliminary screenings before in vivo experiments and reduces the number of animals, thus contributing to the 3R concept as a central precept in preclinical research.
Insights
Researchers created a 3D ex vivo co-culture model to study cancer cell invasion at the brain metastasis interface. This innovative model aids in understanding tumor-brain interactions and glial cell activation, supporting preclinical research.
Area of Science:
- Neuroscience
- Cancer Biology
- Biomedical Engineering
Background:
- The macro-metastasis/organ parenchyma interface (MMPI) is crucial for understanding cancer metastasis, particularly in the brain.
- Assessing tumor cell infiltration and host-pathogen interactions at the MMPI is vital for prognostication.
Purpose of the Study:
- To develop and validate an organotypic 3D ex vivo co-culture model simulating the MMPI.
- To enable detailed analysis of histopathological growth patterns (HGP) and tumor cell infiltration into brain tissue.
- To investigate cancer and glial cell interactions within a controlled ex vivo environment.
Main Methods:
- Co-culture of murine brain slices with 3D tumor cell plugs for up to 96 hours.
- Utilizing fluorescently labeled tumor cells and immunofluorescence staining for glial cells (microglia, astrocytes).
- Employing live and confocal microscopy for real-time observation and analysis of cellular interactions and infiltration.
Main Results:
- The model successfully mimics the MMPI, allowing visualization of tumor cell infiltration into brain slices.
- Glial cell activation and tumor-host cell interactions at the interface can be effectively studied.
- The system provides reproducible data for HGP and infiltration grading.
Conclusions:
- This 3D ex vivo co-culture system is an effective tool for studying brain metastasis at the MMPI.
- It serves as a valuable platform for preliminary screening, reducing the need for animal testing and supporting the 3R principles in research.
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