Abstract
Antisera induced by immunization of rabbits with the synthetic peptide P56/75, which has the amino acid (aa) sequence from aa56 to aa75 of HPV16 L2, neutralize pseudovirions and raft-virions of multiple high-risk HPV types, indicating that cross-neutralization epitopes are present in the aa56–75 region. We generated two mouse monoclonal antibodies (MAb): MAb13B and MAb24B recognizing the regions of aa64–73 and aa58–64, respectively. The neutralization assay using pseudovirions of HPV16, 18, 31, 33, 35, 51, 52 and 58 showed that MAb13B neutralized HPV16, 18, and 51, and MAb24B neutralized all the types tested. The mixture of MAb13B and MAb24B neutralized HPV16, 18, and 51 pseudovirions more efficiently than each of the MAbs alone. The data indicate that there are at least two cross-neutralization epitopes in the aa56–75 region and that an antigen capable of presenting the two cross-neutralization epitopes would be a good vaccine candidate for a broad-spectrum of HPVs.
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