Nitrogen-Containing Lipid Compound for Nucleic Acid Delivery
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Solution Overview
Problem
Nucleic acid drugs face challenges with low membrane penetration and stability, necessitating improved delivery systems.
Innovation Solution
A novel nitrogen-containing chain compound is developed for use in lipid nanoparticles to enhance the delivery of nucleic acid drugs, optimized through specific structural definitions and preparation methods, including a coupling reaction in the presence of a base and iodized salt.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If nucleic acid drugs are used directly, then production costs are low and development cycle is short, but membrane penetration ability is poor and stability is low
Solution Approach 1:
The patent uses composite lipid nanoparticles containing multiple components (ionizable lipid, phospholipid, cholesterol, PEG-lipid) to encapsulate and deliver nucleic acid drugs. This composite structure protects the nucleic acid from degradation while enabling cellular uptake, thus maintaining productivity advantages while improving delivery reliability through the synergistic combination of different lipid materials.
Solution Approach 2:
The patent optimizes the ionization constant (pKa) of the ionizable lipid component to be between 6.0-8.0, which allows the lipid to remain neutral at circulation pH (reducing toxicity) while becoming positively charged in the endosomal environment (enhancing membrane penetration). This parameter optimization resolves the contradiction by enabling the nucleic acid drug to maintain stability during circulation while achieving effective cellular delivery.
2Reliability
If lipid nanoparticle delivery systems are developed to improve stability and delivery efficiency, then delivery efficiency is improved, but the complexity of the delivery system increases
Solution Approach 1:
The ionizable lipid component serves multiple functions: it provides structural integrity to the nanoparticle, enables pH-responsive ionization for endosomal escape, and facilitates cellular membrane penetration. By designing a single lipid molecule that performs multiple functions, the patent reduces overall system complexity while maintaining high delivery efficiency.
Solution Approach 2:
The patent introduces specific functional groups (amino groups, hydroxyl groups) at specific positions on the lipid molecule to create local areas with different properties. The ionizable amino group provides pH-responsive behavior at the headgroup while the hydrophobic tail provides membrane integration, allowing each part of the molecule to contribute to different aspects of delivery efficiency without increasing overall system complexity.
3Object-affected harmful factors
If phospholipid content is reduced to improve safety profile, then safety is enhanced, but delivery efficiency may be compromised
Solution Approach 1:
The patent changes the ionization parameter (pKa) of the lipid component to optimize its behavior at different pH levels. By setting pKa between 6.0-8.0, the lipid remains predominantly uncharged at physiological pH (improving safety by reducing off-target effects) while becoming charged in the acidic endosomal environment (maintaining delivery efficiency through enhanced membrane interaction). This parameter optimization allows reduced phospholipid content without compromising delivery.
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 nitrogen-containing chain compound improves the delivery efficiency of nucleic acid drugs, maintaining effectiveness even with reduced phospholipid content, thereby enhancing delivery and safety.
Implementation Method 1
Lipid nanoparticles have been proven to be used as carriers for delivering bioactive substances (such as small molecule drugs, proteins, and nucleic acids) into cells and/or intracellular compartments
Implementation Method 2
nucleic acids are electronegative large molecules that hardly penetrate through cell membranes
Implementation Method 3
performing, in a solvent and in the presence of a base and an iodized salt, a coupling reaction represented by the following formula on a compound represented by a formula (I-1) and a compound represented by a formula (I-2)
Data Source
AI summary
Disclosed are a nitrogen-containing chain compound, a preparation method, a composition containing said compound, and a use thereof. Provided is a nitrogen-containing chain compound represented by formula (I) or a pharmaceutically acceptable salt thereof. The nitrogen-containing chain compound represented by formula (I) may be used for preparing a lipid carrier. The prepared lipid carrier can encapsulate a nucleic acid drug, and may be used for delivering a nucleic acid prophylactic agent and/or therapeutic agent to mammalian cells and organs and producing an effect.