CD81 slows Ebola virus in cell cultures: Tübingen study

A team led by Professor Michael Schindler at the Institute of Medical Virology and Epidemiology of Viral Diseases, Tübingen University Hospital, has described a cellular defense against the Ebola virus. According to the paper available via dx.doi.org, the cell surface protein CD81 restricts viral replication in cell culture. Researchers from the Friedrich Loeffler Institute and the Bernhard Nocht Institute for Tropical Medicine also took part, and the release is dated 4 November 2026. dx.doi.org

The team first examined how Ebola virus changes the surface of human cells. HeLa cells expressing the viral glycoprotein GP were stained with antibodies against 332 cell surface proteins, and CD81 was singled out as a protein of interest. CD81 belongs to the tetraspanin family, which is involved in several processes at the cell membrane. dx.doi.org

CD81 limits replication and entry

Experiments used 293T, HeLa and Huh7.5 cells and human monocyte-derived macrophages, including 293T cells with CD81 knocked out by CRISPR. To model key stages of infection, the researchers used virus-like particles. When CD81 was absent from the cells studied, certain steps of viral replication were enhanced, and increasing the amount of CD81 inhibited them. CD81 also restricted the entry of virus-like particles into cells. dx.doi.org

Two viral proteins act against CD81

Both the viral surface glycoprotein GP and the matrix protein VP40 reduced the amount of CD81 in the cells studied and on their surface. "Not just one, but two viral proteins act against CD81, even though the Ebola virus only has in total seven proteins," said Elena Hagelauer, who shares first authorship with Dan Hu. In her view, this suggests that the mechanism is a serious obstacle for the virus. dx.doi.org

The team also looked at signaling inside the cell. They found evidence that CD81 influences a signaling pathway activated by VP40. This pathway is involved, among other things, in inflammatory responses, which play a role in severe Ebola cases. According to the authors, this effect may contribute to the observed inhibition of viral replication. dx.doi.org

In a further experiment, the researchers tested whether CD81 can be targeted directly. An antibody that binds to CD81 reduced infection in cell cultures. All results come from cell models and virus-like particles. dx.doi.org

CD81 restricts Ebola virus in cell cultures, and viral GP and VP40 lower its level, Tübingen study finds

CD81 limits replication and entry

Two viral proteins act against CD81

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