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A Naturally Occurring Antibody Fragment Neutralizes Infectivity of Diverse Infectious Agents

2016; Nature Portfolio; Volume: 6; Issue: 1 Linguagem: Inglês

10.1038/srep35018

2045-2322

Luciano Polonelli, Tecla Ciociola, Lisa Elviri, Pier Paolo Zanello, Laura Giovati, Denise C. Arruda, Julián E. Muñoz, Renato A. Mortara, Giulia Morace, Elisa Borghi, Serena Galati, Oriano Marin, Claudio Casoli, Elisabetta Pilotti, Paola Ronzi, Luiz R. Travassos, Walter Magliani, Stefania Conti,

Immune Cell Function and Interaction

A phosphorylated peptide, named K40H, derived from the constant region of IgMs was detected in human serum by liquid chromatography coupled to high-resolution mass spectrometry. Synthetic K40H proved to exert a potent in vitro activity against fungal pathogens, and to inhibit HIV-1 replication in vitro and ex vivo. It also showed a therapeutic effect against an experimental infection by Candida albicans in the invertebrate model Galleria mellonella. K40H represents the proof of concept of the innate role that naturally occurring antibody fragments may exert against infectious agents, shedding a new light upon the posthumous role of antibodies and opening a new scenario on the multifaceted functionality of humoral immunity.