Generation and Characterization of Typhoid Toxin-Neutralizing Human Monoclonal Antibodies [Molecular Pathogenesis]

Typhoid toxin is a virulence factor of Salmonella enterica serovar Typhi, the causative agent of typhoid fever, and is thought to be responsible for the symptoms of severe disease. This toxin has a unique A2B5 architecture with two active subunits, the ADP ribosyl transferase PltA and the DNase CdtB, linked to a pentameric B subunit, which is alternatively made of PltB or PltC. Here, we describe the generation and characterization of typhoid toxin-neutralizing human monoclonal antibodies by immunizing genetically engineered mice that have a full set of human immunoglobulin variable region genes. We identified several monoclonal antibodies with strong in vitro and in vivo toxin-neutralizing activity and different mechanisms of toxin neutralization. These antibodies could serve as the basis for the development of novel therapeutic strategies against typhoid fever.

Source: Infection and Immunity - September 17, 2020 Category: Infectious Diseases Authors: Jiao, X., Smith, S., Stack, G., Liang, Q., Bradley, A., Kellam, P., Galan, J. E. Tags: Molecular Pathogenesis Source Type: research