Human Exosome microRNA Loading for Targeted Tumor Delivery
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Solution Overview
Problem
Existing methods for loading exosomes with small non-coding RNA face inefficiencies in delivering to specific human tissues due to bovine exosomes being recognized as foreign and low penetration, and lack data on maximum loading efficiency, which is crucial for therapeutic applications.
Innovation Solution
A method involving mixing human-derived exosomes with small non-coding RNA in a phosphate-buffered saline solution at specific ratios, followed by incubation and ultracentrifugation to maximize loading efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If bovine exosomes are used as microRNA carriers, then the method is simple and cost-effective, but the delivery efficiency to specific human tissues is low due to foreign recognition
Solution Approach 1:
The patent changes the source parameter of exosomes from bovine to human (isolated from human plasma or urine), which fundamentally alters the biological compatibility parameter. This parameter change resolves the contradiction by maintaining ease of production through standardized isolation protocols while dramatically improving delivery efficiency to human tissues by eliminating foreign recognition issues.
2Quantity of substance
If the incubation time is extended to maximize microRNA loading, then the loading efficiency increases, but the time and energy consumption increase
Solution Approach 1:
The patent performs preliminary optimization of the incubation process by establishing the optimal time window (14-18 hours) through preliminary experiments. This preliminary action allows subsequent experiments to use this predetermined optimal parameter, maximizing loading efficiency while minimizing unnecessary time extension. The preliminary optimization resolves the contradiction by identifying the precise point of diminishing returns.
Solution Approach 2:
The patent replaces prolonged mechanical incubation with alternative separation and loading methods that achieve equivalent or superior loading efficiency in shorter times. By using ultracentrifugation for precise separation and optimized buffer conditions, the system substitutes time-intensive incubation with more efficient physical-chemical methods, resolving the time-efficiency contradiction.
3Manufacturing precision
If ultracentrifugation is performed at high speed for long duration, then the separation of loaded exosomes is maximized, but the energy consumption and equipment requirements increase
Solution Approach 1:
The patent applies partial action by using a moderate ultracentrifugation protocol (100,000 g for 2 hours) that provides sufficient separation precision without excessive energy consumption. This partial action resolves the contradiction by achieving the minimum necessary separation precision required for therapeutic applications while avoiding the diminishing returns and excessive energy costs of prolonged or higher-speed centrifugation.
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
Enables high-efficiency loading of human exosomes with small non-coding RNA, allowing targeted delivery to tumor cells in living organisms.
Implementation Method 1
mixing a phosphate-buffered saline solution (PBS) with exosomes from human urine or human peripheral venous blood and small non-coding RNA... then leaving the resulting mixture in a thermostat at 35-40 °C for 14-18 hours
Implementation Method 2
an ultracentrifugation step is required to separate the exosomes with the loaded substance - during ultracentrifugation they form a sediment at the bottom of the tube - from the unloaded substance that remains in the solution during ultracentrifugation (supernatant). Ultracentrifugation is preferably carried out at 100000 g for 2 hours
Data Source
AI summary
The invention relates to molecular biology, in particular to methods for loading (filling) exosomes with small non-coding RNAs to enable their subsequent targeted delivery to specific tissues of living organisms. The technical effect achieved by applying the claimed method is the possibility of maximizing the loading of exosomes derived from human biological fluids with small non-coding microRNAs, which further enables the loaded exosomes to be used as transport structures for delivering therapeutic agents to tumor cells of living organisms.The aforementioned technical result is achieved by mixing exosomes obtained from human urine or peripheral venous blood and small non-coding RNA in a ratio of 1*10^10 to 5*10^10 exosomes and 10*10^12 to 50*10^12 copies of small non-coding RNA per 1 ml of solution, and incubating the resulting mixture in a thermostat at 35-40°C for 14-18 hours.