Dual Platform Cell Targeting System for Intracellular Cargo Delivery
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Solution Overview
Problem
Delivering compounds such as proteins, peptides, and nucleic acids intracellularly is challenging due to cell membrane resistance, and targeting specific cell types for selective delivery is even more difficult, as many compounds are degraded in endosomes or lysosomes during receptor-mediated endocytosis.
Innovation Solution
A dual platform delivery system is employed, where one platform has a targeting moiety linked to an endosome disrupting moiety through a linker, and the second platform has a different targeting moiety linked to a cargo agent, both designed to induce endocytosis into a common endosome and destabilize it, releasing the cargo agent into the cytosol.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If receptor-mediated endocytosis is used to deliver compounds across cell membranes, then delivery efficiency is improved, but compounds are degraded in endosomes and lysosomes
Solution Approach 1:
The delivery system is divided into two separate platforms: one responsible for targeting and endocytosis, the other for cargo protection and release. This segmentation allows each component to optimize its function while avoiding the degradation problem in endosomes/lysosomes.
Solution Approach 2:
A pH-sensitive linker acts as an intermediary between the targeting moiety and cargo agent. This linker remains stable at endosomal pH but cleaves at the slightly higher pH of the cytosol, mediating controlled cargo release and preventing degradation.
2Measurement precision
If a single targeting moiety is used to target specific cells, then targeting specificity is improved, but off-target delivery cannot be avoided
Solution Approach 1:
Two different targeting moieties are combined on separate delivery platforms that both target the same cell type. This merging of targeting strategies creates a synergistic effect where both platforms must successfully bind to and be internalized by the target cell, significantly reducing off-target delivery.
Solution Approach 2:
The system uses multiple targeting moieties (excessive action) rather than a single targeting moiety. This redundancy ensures that only cells expressing the target receptors will internalize both platforms, providing a safety margin against off-target effects.
3Reliability
If compounds are delivered to the cytosol, then therapeutic efficacy is improved, but cell membrane resistance prevents entry
Solution Approach 1:
The delivery system exploits the cell's own endocytic machinery to overcome membrane resistance. By attaching targeting moieties that bind to cell surface receptors, the system hijacks the natural receptor-mediated endocytosis pathway, allowing the cargo to be transported across the membrane without directly penetrating the lipid bilayer.
Solution Approach 2:
The cell's endocytic apparatus serves as an intermediary that facilitates cargo transport across the membrane. The targeting moiety acts as a key that activates this intermediary transport mechanism, allowing selective entry into target cells while avoiding the resistance posed by the cell membrane.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances the specificity and efficacy of delivering therapeutic agents to targeted cells by avoiding off-targeting and degradation, allowing for synergistic cytotoxic effects and increased selectivity, particularly in cancer cells that express specific receptor combinations.
Implementation Method 1
the first delivery platform and second delivery platform are internalized into a common endosome, and the endosome is destabilized, releasing the cargo agent into cytosol of the cell
Implementation Method 2
the delivery system is configured so as to cause endocytosis of the first delivery platform and second delivery platform in a common endosome
Data Source
AI summary
A method of delivering a cargo agent into cytosol of a cell can include: providing the delivery system of one of the embodiments described herein having the first and second delivery platforms; and administering the delivery system to a cell so as to cause targeting of two features on the cell so as to: cause endocytosis of the first and second delivery platforms of the delivery system into a common endosome, destabilize the endosome of the cell having the delivery system, release the cargo agent from the second linker; and release the cargo agent from the destabilized endosome into cytosol of the cell. A method of treating a disease can include: performing the method of method of delivering a cargo agent into cytosol of a cell in a subject having a disease, wherein the cargo agent is a therapeutic agent for the disease.