Disclosed herein are linker architectures for conjugates that do not rely on the SAR of the cleavable trigger or the large steric bulk of a closely positioned antibody to alter payload release. These linkers are expected to reduce off-target payload release facilitated by extracellular cathepsins, and may also be applicable to conjugates of antibody fragments that lack the steric protection from a full antibody. In addition, the linkers disclosed herein are expected to provide more selective intracellular payload release. Thus, these linkers can function synergistically with the targeting vector to confer differential payload release rates in vivo that improve the selectivity of intracellular payload release and reduce off target toxicity.
本文揭示了一种连接体架构,用于结合物,不依赖于可切割触发器的
SAR或临近
抗体的大立体体积来改变荷载释放。预计这些连接剂将减少由细胞外半胱天
蛋白酶促进的非靶向荷载释放,并且也适用于缺乏完整
抗体的
抗体片段的结合物。此外,本文揭示的连接剂预计提供更有选择性的细胞内荷载释放。因此,这些连接剂可以与靶向载体协同作用,以在体内提供不同的荷载释放速率,从而提高细胞内荷载释放的选择性并减少非靶向毒性。