Trimeric Cell-Penetrating Peptide Conjugates for Endosomal Escape
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Solution Overview
Problem
Current methods for intracellular delivery of biomacromolecules, such as antibodies or antibody fragments, face challenges due to entrapment in endosomes and require high concentrations, which is inefficient and potentially toxic.
Innovation Solution
The use of trimeric cell-penetrating peptides (CPPs) that can deliver functional biomacromolecules like antibodies or Fab fragments into the cytosol and nucleus of cells, maintaining their activity, either in linear or cyclic formats, by interacting with the plasma membrane or escaping from vesicle-like bodies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polycationic molecules such as polymers, lipid particles, or cell-penetrating peptides are used for intracellular delivery, then cargo can be transported into cells, but endocytic entrapment occurs and delivery efficacy is low
Solution Approach 1:
The patent combines multiple cell-penetrating peptide sequences (e.g., TAT, penetratin, or other CPPs) into a single trimeric structure. This merging of multiple functional units into one delivery vehicle enhances the ability to overcome endocytic entrapment while maintaining cargo transport capability, thereby improving intracellular delivery efficacy without suffering from the limitations of single CPP approaches
Solution Approach 2:
The invention creates a composite structure consisting of a trimeric peptide framework conjugated to cargo molecules (such as antibodies, antibody fragments, or other biomacromolecules). This composite material approach allows the delivery vehicle to combine the cell-penetrating properties of the peptide trimer with the functional properties of the cargo, enabling effective intracellular delivery while avoiding endocytic entrapment
2Productivity
If high concentrations of CPPs are used to achieve desirable in vitro results, then cell penetration is improved, but toxicity increases
Solution Approach 1:
By merging multiple CPP sequences into a single trimeric structure, the invention achieves enhanced cell penetration efficiency at lower concentrations. The synergistic effect of multiple CPP units within one molecule allows the system to maintain high productivity while reducing the overall concentration needed, thereby minimizing toxicity
Solution Approach 2:
The invention changes the structural parameter of the CPP from monomeric or dimeric forms to trimeric forms. This parameter change (from single or double units to triple units) fundamentally alters the concentration-response relationship, enabling effective cell penetration at lower concentrations and thus reducing the harmful effects of high concentration exposure
3Quantity of substance
If Tat peptide is used for intracellular delivery, then cargo transport into cells is achieved, but leakage from endosomes is inefficient
Solution Approach 1:
The patent merges multiple cell-penetrating peptide sequences (including but not limited to TAT) into a trimeric structure that combines the cargo transport capability of TAT with the endosomal escape properties of other CPPs. This merging allows the delivery system to simultaneously achieve efficient cargo delivery and effective endosomal escape, overcoming the limitations of using TAT alone
Solution Approach 2:
The invention creates a composite peptide structure that integrates multiple CPP functionalities. The trimeric framework combines peptides with different properties (e.g., TAT for nuclear localization, penetratin for membrane penetration, and other CPPs for endosomal escape), creating a composite material that achieves both high cargo delivery amount and high endosomal escape efficiency
Data Source
AI summary
A compound comprising formula I; wherein; W is an extension moiety, X is selected from a cargo moiety, or H, Y is a linking moiety, Z is a cell penetrating peptide comprising SEQ ID NO:1 (RXXRRXRRR), wherein n=0 to 10, and wherein Z is joined to Y via one atom of Z, or is joined to Y via at least two atoms of Z such as to form a cyclic moiety with Y. The invention also extends to methods for use of the compound.