Endosomal Disrupting Element for Cytosolic Cargo Release
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Delivering compounds such as proteins, peptides, and nucleic acids into cells is challenging due to cell membranes resisting their passage, and existing methods like receptor-mediated endocytosis often result in entrapment and degradation in late endosomes or lysosomes.
Innovation Solution
A delivery system comprising a membrane binding element linked to an endosomal compartment disrupting element through a linker with anionic moieties, which induces endocytosis into early/recycling endosomes and destabilizes them, allowing the cargo molecule to be released into the cytosol.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If receptor-mediated endocytosis is used to deliver compounds into cells, then cell membrane penetration is achieved, but cargo molecules are trapped and degraded in late endosomes or lysosomes
Solution Approach 1:
The delivery system is divided into distinct functional modules: a membrane binding element for cell entry, a cleavable linker for cargo release, and an endosomal disrupting element for escape from degradation compartments. This segmentation allows each component to perform its specific function optimally while avoiding the harmful degradation pathway.
Solution Approach 2:
The patent introduces an endosomal disrupting element as an intermediary that mediates between the endocytic pathway and cargo release. This element specifically targets and destabilizes early/recycling endosomes, creating a pathway for cargo escape before degradation occurs in late endosomes or lysosomes.
2Quantity of substance
If endocytic pathways are used for delivery, then cell uptake is achieved, but cargo is directed to acidic late endosomes and lysosomes where degradation occurs
Solution Approach 1:
The delivery system performs preliminary disruption of early/recycling endosomes before cargo molecules can be trafficked to the acidic degradation environment of late endosomes and lysosomes. The endosomal disrupting element acts preemptively to create escape pathways at the earliest possible stage in the endocytic pathway.
Solution Approach 2:
The patent exploits pH parameter changes along the endocytic pathway by designing the endosomal disrupting element to be activated by the acidic environment of early endosomes. This pH-dependent activation allows selective disruption at the appropriate stage while avoiding degradation in more acidic late compartments.
3Reliability
If membrane disruption is used to release cargo from endosomes, then cytosolic delivery is achieved, but non-specific membrane damage may occur
Solution Approach 1:
The endosomal disrupting element is designed to exert its membrane-disrupting effect locally within endosomal compartments rather than throughout the entire cell. The element remains sequestered in endosomes until activated by acidic pH, ensuring that membrane disruption occurs only in the target compartment and not in the plasma membrane or other organelles.
Solution Approach 2:
The patent extracts the membrane-disrupting function from the cargo molecule itself and places it in a separate endosomal disrupting element that is released upon endosome disruption. This separation allows the disruptor to perform its function transiently within the endosome without permanently associating with the cargo, reducing the risk of non-specific damage.
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
Effectively delivers cargo molecules into the cytosol, avoiding degradation in late endosomes or lysosomes by targeting early/recycling endosomes and using selectively cleavable linkers and pH-dependent membrane disruptors to release the cargo.
Implementation Method 1
the endosomal compartment disrupting element destabilizes the early/recycling endosome such that the exogenous cargo molecule is released from the second membrane binding element and into the cytosol of the living cell
Data Source
AI summary
A delivery system for introducing a cargo molecule into cytosol of a living cell can include: a first membrane binding element linked to an endosomal compartment disrupting element through a first linker having one or more anionic moieties; and a second membrane binding element linked to an exogenous cargo molecule through a second linker having one or more anionic moieties, the second linker having a region that is selectively cleavable, wherein the first and second membrane binding elements both induce endocytosis into an early/recycling endosome and the endosomal compartment disrupting element destabilizes the early/recycling endosome such that the exogenous cargo molecule is released from the second membrane binding element and into the cytosol of the living cell.