Work

Biomimetic bispecific antibody-drug conjugates based on albumin binding domain fusing nanobodies targeting EGFR and HER2

Year: 2026

Type: article

Abstract: Bispecific antibodydrug conjugates represent an innovative concept for cancer therapy, which integrates the merits of both antibodydrug conjugates and bispecific antibodies. In this study, a proof-of-concept biomimetic bispecific antibody based on an albumin binding domain fusing with camelid-derived nanobodies was devised to deliver anti-cancer drugs to replicate the two most distinctive features of ADCs: long-acting in vivo and tumor targeting, while reducing products heterogeneity and production cost. To validate this concept, an anti-EGFR nanobody and an anti-HER2 nanobody were used as model sequences to construct biomimetic bispecific antibodies. The biomimetic bispecific antibodies were efficiently expressed in Escherichia coli bacteria and produced at considerably low cost, and the model cytotoxic payload (mc-vc-PAB-MMAE) were site-specifically coupled to the fusion protein through a cysteine-maleimide based conjugation approach. These bispecific protein-MMAE conjugates were well characterized in vitro, and exhibited prolonged circulation times in healthy rats and superior anti-tumor efficacy in an A549 xenograft mice model. The works could provide a general strategy for design of biomimetic bispecific ADCs for cancer therapies.

Source: Biomedicine & Pharmacotherapy

DOI: 10.1016/j.biopha.2026.119016

Authors: Zijie Chen, Xiaotong Song, Yongxiang Zheng, Shuwen Zhang, Rong Yu, Chun Zhang

Institution: Sichuan University

Language: English

Topic: Monoclonal and Polyclonal Antibodies Research

Subfield: Radiology, Nuclear Medicine and Imaging

Field: Medicine

Domain: Health Sciences

SDG: Good health and well-being

Open Access status: gold

Estimated APC paid: $3,610