Related Experiment Video
Updated: Oct 22, 2025
Author Spotlight: Insight Into Advances in Prion Diseases Research
Published on: August 11, 2023
Propagation of CJD Prions in Primary Murine Glia Cells Expressing Human PrPc
Joo-Hee Wälzlein1, Karla A Schwenke1, Michael Beekes1
1Prion and Prionoid Research Unit, ZBS 6-Proteomics and Spectroscopy, ZBS-Centre for Biological Threats and Special Pathogens, Robert Koch Institute, Nordufer 20, 13353 Berlin, Germany.
Abstract:
There are various existing cell models for the propagation of animal prions. However, in vitro propagation of human prions has been a long-standing challenge. This study presents the establishment of a long-term primary murine glia culture expressing the human prion protein homozygous for methionine at codon 129, which allows in vitro propagation of Creutzfeldt-Jakob disease (CJD) prions (variant CJD (vCJD) and sporadic CJD (sCJD) type MM2). Prion propagation could be detected by Western blotting of pathological proteinase K-resistant prion protein (PrPSc) from 120 days post exposure. The accumulation of PrPSc could be intensified by adding a cationic lipid mixture to the infectious brain homogenate at the time of infection. Stable propagation of human prions in a long-term murine glia cell culture represents a new tool for future drug development and for mechanistic studies in the field of human prion biology. In addition, our cell model can reduce the need for bioassays with human prions and thereby contributes to further implementation of the 3R principles aiming at replacement, reduction and refinement of animal experiments.
Insights
Researchers developed a new cell model for propagating human prions, specifically Creutzfeldt-Jakob disease (CJD) prions, in vitro. This breakthrough offers a valuable tool for studying human prion diseases and developing new treatments, reducing reliance on animal testing.
Area of Science:
- Neuroscience
- Cell Biology
- Prion Biology
Background:
- In vitro propagation of human prions remains a significant challenge.
- Existing cell models are primarily for animal prions.
- Human prion diseases like Creutzfeldt-Jakob disease (CJD) require better research tools.
Purpose of the Study:
- To establish a long-term cell culture model for in vitro propagation of human prions.
- To enable detailed mechanistic studies of human prion diseases.
- To facilitate the development of novel therapeutic strategies for CJD.
Main Methods:
- Established a primary murine glia cell culture expressing human prion protein (huPrP) with methionine at codon 129 (Met/Met).
- Inoculated cells with Creutzfeldt-Jakob disease (CJD) prions (vCJD and sCJD type MM2).
- Detected prion propagation via Western blotting for pathological prion proteinase K-resistant prion protein (PrPSc).
Main Results:
- Successfully established a long-term murine glia cell culture model for human prion propagation.
- Demonstrated stable propagation of CJD prions (vCJD and sCJD MM2) detectable by PrPSc accumulation after 120 days.
- Showed that cationic lipid mixtures can enhance PrPSc accumulation.
Conclusions:
- The developed murine glia cell model provides a robust platform for in vitro propagation of human prions.
- This model serves as a valuable tool for drug development and mechanistic studies in human prion biology.
- The cell model supports the 3R principles by potentially reducing the need for animal bioassays in prion research.
