ArticlemAbs2026
A novel insulin-like growth factor II-based masking domain for conditional activation of therapeutic antibodies.
Article in mAbs, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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5 authors.
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Abstract
Systemic target engagement constrains the therapeutic index of many antibody drugs, particularly in inflammatory disease and immuno-oncology. Protease-cleavable masking can localize activity to disease sites, but existing approaches often tradeoff masking strength, reversibility, and developability. Here, we evaluated the insulin-like growth factor II (IGF-II) as a compact, structurally defined steric masking domain for protease-dependent conditional activation of therapeutic antibodies. IGF-II masking domains, including a receptor-silent variant (IGF-II-s), were engineered as N-terminal fusions to therapeutic antibodies via protease-cleavable linkers and characterized using antigen-binding and cell-based functional assays. IGF-II masking attenuated anti-TNFα binding and neutralization potency in a protease-dependent manner and activity was largely restored following cleavage.
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