PROBLEM TO BE SOLVED: To provide fully humanized monoclonal antibodies which have binding specificity for Toll-like receptor 2 (TLR2), and which antagonize TLR2 function, but which are essentially non-immunogenic in humans.SOLUTION: This invention relates to an isolated monoclonal antibody, or antigen binding portion thereof, which binds an epitope on human Toll-like receptor 2 with a KD of 3×10-8 M or less and which mediates Toll-like receptor 2 antagonism independently of CD32 (Fc γ receptor II), where the epitope is recognised by a reference antibody, where the reference antibody comprises a heavy chain variable region comprising a specific amino acid sequence and a light chain variable region comprising another specific amino acid sequence. Also provided are nucleic acids encoding such antibodies, as well as the use of the antibodies in medicine, in particular for the treatment of inflammatory and autoimmune diseases which are mediated by Toll-like receptor 2 activation and signalling.SELECTED DRAWING: Figure 1B【課題】Toll様受容体2(TLR2)に特異的に結合し、TLR2機能に拮抗するが、ヒトにおいて実質的に非免疫原生である、完全なヒト化モノクローナル抗体を提供する。【解決手段】ヒトToll様受容体2のエピトープと3×10-8M以下のKDで結合し、CD32(Fcγ受容体II)とは独立にToll様受容体2の拮抗に介在する抗体またはその抗原結合部位であり、前記エピトープは、参照抗体に認識され、前記参照抗体は、特定のアミノ酸配列を含む重鎖の可変領域および他の特定のアミノ酸配列を含む軽鎖の可変領域を含む、単離されたモノクローナル抗体またはその抗原結合部位。また、提供するのは、このような抗体をコード化する核酸並びに医療における抗体の使用、特にToll様受容体2の活性およびシグナリングによって介在される炎症および自己免疫疾患の治療を含む。【選択図】図1B