Experimental monoclonal antibodies show promise against Epstein-Barr virus

Researchers have discovered a panel of investigational monoclonal antibodies (mAbs) targeting different sites of the Epstein-Barr virus (EBV) blocked infection when tested in human cells in a laboratory setting. Moreover, one of the experimental mAbs provided nearly complete protection against EBV infection and lymphoma when tested in mice.

The results have appeared online  in the journal Immunity. Scientists from the National Institute of Allergy and Infectious Diseases (NIAID).

Epstein-Barr virus (EBV) is one of the most common human viruses. After an EBV infection, the virus becomes dormant in the body but may reactivate in some cases. It is the primary cause of infectious mononucleosis and is associated with certain cancers, including Hodgkin lymphoma, and autoimmune diseases, such as multiple sclerosis. People with weakened immune systems, such as transplant recipients, are more likely than immunocompetent people to develop severe symptoms and complications from EBV infection. There is no licensed vaccine to protect against the virus.

The researchers developed several investigational mAbs targeting two key proteins-gH and gL-found on EBV's surface. The two proteins are known to facilitate EBV fusion with human cells and cause infection. When tested in the laboratory setting, the investigational mAbs prevented EBV infection of human B cells and epithelial cells, which line the throat at the initial site of EBV infection.

Analyzing the structure of the mAbs and their two surface proteins using X-ray crystallography and advanced microscopy, the researchers identified multiple sites of vulnerability on the virus to target. When tested in mice, one of the experimental mAbs, called mAb 769B10, provided almost complete protection against EBV infection when given. The mAb also protected all mice tested from EBV lymphoma.

The findings highlight viable EBV vaccine targets and the potential for the experimental mAbs to be used alone or in combination to prevent or treat EBV infection in immunocompromised patients most susceptible to severe EBV-related disease, according to the researchers. 

Reference:

Wei-Hung Chen, JungHyun Kim, Wei Bu, Nathan L. Board, Yaroslav Tsybovsky, Yanmei Wang, Anna Hostal, Sarah F. Andrews, Rebecca A. Gillespie, Misook Choe, Tyler Stephens, Eun Sung Yang, Amarendra Pegu, Caroline E. Peterson, Brian E. Fisher, John R. Mascola, Stefania Pittaluga, Adrian B. McDermott, Masaru Kanekiyo, M. Gordon Joyce, Jeffrey I. Cohen Published:October 27, 2022DOI:https://doi.org/10.1016/j.immuni.2022.10.003