著者
岸本 聡 伊東 祐二
出版者
公益社団法人 日本薬学会
雑誌
MEDCHEM NEWS (ISSN:24328618)
巻号頁・発行日
vol.27, no.1, pp.35-41, 2017-02-01 (Released:2019-06-30)
参考文献数
28

抗体医薬の新たなフォーマットとして、ラクダ科の重鎖抗体由来の抗原結合ドメイン(VHH, Nanobody)を使った医薬品開発が進められている。このVHHは、高い安定性、バクテリアにおける高い発現効率、抗体工学の容易さといった優れた特性をもつ一方で、投与後の血中半減期の短さといった弱点もあわせもつ。臨床試験の結果を通して、このようなVHH医薬品の課題と今後の展開について考えてみたい。さらに、ファージディスプレイライブラリーと網羅的配列解析手法を使った新しいVHHの開発手法、ならびに、VHHを使った新しい抗体医薬品の形として、抗体特異的修飾法(CCAP:Chemical conjugation by affinity peptide)によるIgG-VHHコンジュゲートについて紹介する。
著者
伊東 祐二
出版者
公益社団法人 日本薬学会
雑誌
YAKUGAKU ZASSHI (ISSN:00316903)
巻号頁・発行日
vol.137, no.7, pp.823-830, 2017 (Released:2017-07-01)
参考文献数
15
被引用文献数
2

As an alternative to hybridoma technology, the antibody phage library system can also be used for antibody selection. This method enables the isolation of antigen-specific binders through an in vitro selection process known as biopanning. While it has several advantages, such as an avoidance of animal immunization, the phage cloning and screening steps of biopanning are time-consuming and problematic. Here, we introduce a novel biopanning method combined with high-throughput sequencing (HTS) using a next-generation sequencer (NGS) to save time and effort in antibody selection, and to increase the diversity of acquired antibody sequences. Biopannings against a target antigen were performed using a human single chain Fv (scFv) antibody phage library. VH genes in pooled phages at each round of biopanning were analyzed by HTS on a NGS. The obtained data were trimmed, merged, and translated into amino acid sequences. The frequencies (%) of the respective VH sequences at each biopanning step were calculated, and the amplification factor (change of frequency through biopanning) was obtained to estimate the potential for antigen binding. A phylogenetic tree was drawn using the top 50 VH sequences with high amplification factors. Representative VH sequences forming the cluster were then picked up and used to reconstruct scFv genes harboring these VHs. Their derived scFv-Fc fusion proteins showed clear antigen binding activity. These results indicate that a combination of biopanning and HTS enables the rapid and comprehensive identification of specific binders from antibody phage libraries.