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Isolation of therapeutic human monoclonal antibodies for varicella-zoster virus and the effect of light chains on the neutralizing activity

Isolation of therapeutic human monoclonal antibodies for varicella-zoster virus and the effect of light chains on the neutralizing activity

Journal of Medical Virology 79(6): 852-862

ISSN/ISBN: 0146-6615

PMID: 17457901

DOI: 10.1002/jmv.20838

Therapeutic antibodies against varicella-zoster virus (VZV) were isolated from a combinatorial library of human antibodies using a phage-display system. Purified gH:gL was used to screen the library, and approximately 300 clones were isolated. Eight kinds of Fab-cp3-fused molecules (clones 10, 24, 36, 60, 94, 120, 192, and 431) neutralized viral infectivity. After conversion of Fab-cp3 antibodies to the Fab-protein A form, the concentrations of antibodies showing 50% inhibition of plaque formation ranged from 0.12 to 400 nM. Clones 10, 24, 94, 120 and 431 neutralized wild strains without showing strain specificity and were further converted to human IgG(1). Two clones (24 and 94) were confirmed to react with gH:gL and VZV-infected cells. IgG of clone 94 prevented spreading of infected cells. Thus these antibodies exhibited the typical phenotype of anti-gH antibody. Next the contribution of light (L) chains to neutralizing activity was analyzed by comparing the effect of L chain of clones 10, 120, and 192 with the identical heavy chain on their neutralizing activity. The L chain in the Fab form of clone 94 was replaced by L chains of clones 10, 24, 36, and 60 and the neutralizing activity of these replaced antibodies was weaker than that of the prototype clone 94. When the kappa-L chain of clone 94 was replaced by the lambda-L chain of clone 24, this antibody possessed neutralizing activity despite the kappa-lambda class change. Thus, human antibody library against VZV-gH has been established and characterized the role of the L chain in VZV-neutralizing activity to engineering further an antibody with stronger neutralizing activity.

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Accession: 013746165

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