C-Terminal Peptide Elements for Selective Cell and Tissue Penetration
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Solution Overview
Problem
Existing cell-penetrating peptides lack selectivity in targeting specific cell types and tissues, leading to non-specific distribution and inefficient delivery of compositions.
Innovation Solution
The use of CendR elements, which are not covalently or non-covalently associated with co-compositions, to enhance selective internalization and penetration of peptides and proteins into target cells and tissues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional cell-penetrating peptides are used for composition delivery, then cell penetration capability is achieved, but cell type selectivity is lost
Solution Approach 1:
The peptide is divided into two functional segments: an N-terminal cell-penetrating peptide segment that enables cell penetration, and a C-terminal targeting segment that provides cell type specificity. This segmentation allows each segment to perform its specialized function independently, resolving the contradiction between penetration capability and selectivity.
Solution Approach 2:
Different regions of the peptide are given different functional properties: the N-terminal region is optimized for cell penetration (hydrophobic/cationic characteristics), while the C-terminal region is optimized for specific cell type targeting (receptor binding motifs). This local differentiation of properties enables simultaneous achievement of penetration and selectivity.
2Adaptability or versatility
If peptides are used to deliver compositions to tissues, then some tissue penetration occurs, but effective penetration into extravascular space is insufficient
Solution Approach 1:
The C-terminal segment acts as an intermediary that mediates between the circulating composition and the target tissue. It binds to specific receptors on the tissue surface, facilitating the transition of the composition from the vascular space into the extravascular tissue space, thereby improving delivery precision.
3Productivity
If non-specific peptides are used for delivery, then broad cell penetration is achieved, but selective targeting of specific cell types is lost
Solution Approach 1:
The peptide is designed to perform multiple functions simultaneously: the N-terminal segment provides universal cell penetration capability across different cell types, while the C-terminal segment provides specific targeting to particular cell types through receptor binding. This multi-functionality resolves the contradiction between delivery efficiency and targeting specificity.
Data Source
AI summary
Disclosed are compositions and methods useful for targeting and internalizing molecules into cells of interest and for penetration by molecules of tissues of interest. The compositions and methods are based on peptide sequences that are selectively internalized by a cell, penetrate tissue, or both. The disclosed internalization and tissue penetration is useful for delivering therapeutic and detectable agents to cells and tissues of interest.