pH-Responsive Cell-Penetrating Complexes for Nucleic Acid Release
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Solution Overview
Problem
There is a need for improved materials and strategies to deliver therapeutic agents, diagnostic probes, and research tools across cellular membranes and biological barriers for clinical, diagnostic, and research applications, particularly in areas like vaccination strategies for infectious diseases, cancer immunotherapy, and gene editing.
Innovation Solution
Development of cell-penetrating complexes comprising nucleic acids non-covalently bound to cationic amphipathic polymers with pH-sensitive immolation domains, which form nanoparticle compositions for 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 low, but using cationic amphipathic polymers improves delivery efficiency while potentially causing cytotoxicity
Solution Approach 1:
The cationic amphipathic polymer is segmented into distinct functional domains: a cationic domain for nucleic acid binding, an amphipathic domain for membrane interaction, and a pH-sensitive immolation domain for controlled release. This segmentation allows each domain to perform its specific function while reducing overall cytotoxicity.
Solution Approach 2:
The polymer undergoes parameter changes in response to pH variations. At physiological pH, the polymer maintains a stable structure for safe cellular uptake. Upon endosomal acidification, the pH-sensitive immolation domain triggers conformational changes and nucleic acid release, achieving efficient transfection without sustained cytotoxic exposure.
2Stability of the object's composition
If stable polymer-nucleic acid complexes are formed, then delivery stability is improved, but nucleic acid release inside cells is inhibited
Solution Approach 1:
The polymer-nucleic acid complex transitions from a stable configuration at physiological pH to a dynamic, disassembling state upon endosomal acidification. The pH-sensitive immolation domain enables this dynamic transition, ensuring stable delivery to the target compartment while facilitating efficient nucleic acid release upon stimulation.
Solution Approach 2:
The pH-sensitive immolation domain acts as an intermediary that senses the pH environment and mediates the transition from stable complex formation to controlled nucleic acid release. This intermediary mechanism ensures that stability and release are not mutually exclusive but are sequentially activated in different cellular compartments.
3Reliability
If cationic polymers are used for nucleic acid binding, then complex formation is enhanced, but immune system activation increases
Solution Approach 1:
The polymer exhibits local quality variations through its domain structure: the cationic domain provides strong nucleic acid binding capability, while the amphipathic domain modulates immune interaction. This local differentiation allows reliable complex formation at the molecular level while reducing unwanted immune system activation at the cellular level.
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 complexes effectively deliver nucleic acids into cells, enhancing transfection efficiency and inducing immune responses, as demonstrated by improved tumor immunogenicity and vaccination strategies.
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.