Japan Health Sciences Foundation

Tadahito Kanda

Seiichiro Mori

Kazunari Kondo

The present invention relates to the development of a monoclonal antibody which has binding activity to many high-risk types of HPV, etc. The present invention also provides a simple and high-throughput method for measuring cross-neutralizing antibody titers, which is used for assay of cross-neutralizing antibody against HPV in serum samples from subjects, etc. The method of the present invention for measuring cross-neutralizing antibody titers comprises the steps of: preparing a monoclonal antibody against a peptide having a specific amino acid sequence common to high-risk types of HPV; and assaying cross-neutralizing antibody using this monoclonal antibody.

Monoclonal antibody recognizing human papillomavirus (HPV) L2 protein and method for measuring HPV-neutralizing antibody titer using the same

Disclosed is a vaccine antigen capable of inducing a cross-reacting and neutralizing antibody directed against a high-risk-type human papillomavirus. Specifically disclosed are: a chimeric protein comprising an L2-epitope of a human papillomavirus (HPV) type-16 inserted in a loop region of a human papillomavirus type-16 L1 protein; and a capsid which is a particle formed by the chimeric protein. The loop region to which the L2-epitope is to be inserted is located between an amino acid residue at position-430 and an amino acid residue at position-433. The L2-epitope has an amino acid sequence represented by any one of the following formulae: LYKTCKQAGTCPPDIIPKVEG (SEQ ID NO: 2) (18-38 L2-epitope); GGLGIGTGSGTGGRTGYIPL (SEQ ID NO: 3) (56-75 L2-epitope); and DPVGPLDPSIVSLVEESSFI (SEQ ID NO: 4) (96-115 L2-epitope).

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Tokyo, Japan

Tadahito Kanda