pH-Responsive Cell-Penetrating Complexes for Nucleic Acid Delivery
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Solution Overview
Problem
Existing technologies have not effectively addressed the delivery of therapeutic agents, diagnostic probes, and research tools across cell membranes and biological barriers for clinical, diagnostic, and research applications, particularly in areas such as vaccination strategies for infectious diseases, cancer immunotherapy, and gene editing.
Innovation Solution
A cell-penetrating complex comprising a nucleic acid non-covalently bound to a cationic amphipathic polymer with a pH-sensitive immolation domain, which facilitates efficient transfection and immune response induction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If nucleic acids are delivered directly into cells, then transfection efficiency is improved, but cellular uptake is hindered due to negative charge repulsion and large size
Solution Approach 1:
A cationic amphipathic polymer acts as an intermediary carrier between the nucleic acid and the cell membrane. The polymer forms a complex with the negatively charged nucleic acid through electrostatic interactions, creating a positively charged delivery vehicle that can effectively interact with and penetrate the cell membrane, thereby overcoming the charge repulsion barrier and enabling efficient cellular uptake
Solution Approach 2:
The delivery system undergoes parameter changes in response to pH variations. The cationic amphipathic polymer exhibits pH-responsive behavior, changing its conformational state and charge characteristics as it moves from the neutral extracellular environment to the acidic intracellular environment, which facilitates endosomal escape and releases the nucleic acid payload into the cytoplasm
2Productivity
If cationic polymers are used to enhance cellular uptake, then transfection efficiency is improved, but cytotoxicity increases due to strong electrostatic interactions with cell membranes
Solution Approach 1:
The polymer is designed with amphipathic properties, creating local quality differences within the same molecule. Hydrophobic regions interact with the lipid bilayer of cell membranes to facilitate uptake, while hydrophilic regions interact with the aqueous environment and nucleic acid payload. This spatial differentiation of functional properties enables efficient delivery while reducing non-specific toxic interactions
Solution Approach 2:
The cationic amphipathic polymer exhibits dynamic conformational changes in response to environmental conditions, particularly pH. The polymer transitions between different structural states and charge configurations as it traverses from extracellular to intracellular compartments, allowing it to adapt its interaction strength with cellular components and minimize cytotoxicity while maintaining transfection efficiency
3Stability of the object's composition
If nucleic acids are protected from degradation, then stability is improved, but cellular internalization becomes more difficult due to increased molecular size and complexity
Solution Approach 1:
The nucleic acid payload is merged with the cationic amphipathic polymer to form a unified delivery complex. The polymer encapsulates or associates with the nucleic acid through electrostatic interactions, creating a single integrated structure that provides both physical protection against nucleases and the necessary properties for cellular internalization, thereby simultaneously achieving stability and deliverability
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
The complex enables effective delivery of nucleic acids into cells, enhancing therapeutic efficacy and immune responses, as demonstrated by improved transfection efficiencies and immune activation in various cell lines and animal models.
Implementation Method 1
a nucleic acid non-covalently bound to a cationic amphipathic polymer
Implementation Method 2
the cationic amphipathic polymer including a pH-sensitive immolation domain
Data Source
AI summary
There are provided herein, inter alia, complexes, compositions and methods for the delivery of therapeutic, diagnostic and imaging agents, including nucleic acid, into a cell. The complexes, compositions and methods may facilitate complexation, protection, delivery and release of oligonucleotides and polyanionic cargos into target cells, tissues, and organs both in vitro and in vivo.