Simple 3D spheroid cell culture model for studies of prion infection

Author:

Fremuntova Zuzana1,Hanusova Zdenka Backovska1,Soukup Jakub1,Mosko Tibor1,Matej Radoslav2,Holada Karel1ORCID

Affiliation:

1. Institute of Immunology and Microbiology, First Faculty of Medicine Charles University Prague Czech Republic

2. Department of Pathology and Molecular Medicine, Third Faculty of Medicine Charles University and Thomayer University Hospital Prague Czech Republic

Abstract

AbstractMouse neuronal CAD 5 cell line effectively propagates various strains of prions. Previously, we have shown that it can also be differentiated into the cells morphologically resembling neurons. Here, we demonstrate that CAD 5 cells chronically infected with prions undergo differentiation under the same conditions. To make our model more realistic, we triggered the differentiation in the 3D culture created by gentle rocking of CAD 5 cell suspension. Spheroids formed within 1 week and were fully developed in less than 3 weeks of culture. The mature spheroids had a median size of ~300 μm and could be cultured for up to 12 weeks. Increased expression of differentiation markers GAP 43, tyrosine hydroxylase, β‐III‐tubulin and SNAP 25 supported the differentiated status of the spheroid cells. The majority of them were found in the G0/G1 phase of the cell cycle, which is typical for differentiated cells. Moreover, half of the PrPC on the cell membrane was N‐terminally truncated, similarly as in differentiated CAD 5 adherent cells. Finally, we demonstrated that spheroids could be created from prion‐infected CAD 5 cells. The presence of prions was verified by immunohistochemistry, western blot and seed amplification assay. We also confirmed that the spheroids can be infected with the prions de novo. Our 3D culture model of differentiated CAD 5 cells is low cost, easy to produce and cultivable for weeks. We foresee its possible use in the testing of anti‐prion compounds and future studies of prion formation dynamics.

Funder

Agentura Pro Zdravotnický Výzkum České Republiky

Publisher

Wiley

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