AIE Nanoparticles for Stable Cell Tracking
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Solution Overview
Problem
Conventional fluorescent bioprobes face challenges such as aggregation-caused quenching, toxicity, and instability within living cells, leading to weak fluorescence signals and leakage, which limits their effectiveness for long-term cellular tracking and imaging.
Innovation Solution
Development of luminogen-based nanoparticles exhibiting aggregation-induced emission (AIE) properties, which are cytocompatible, non-toxic, and remain stable inside cells for extended periods, enabling long-term cellular tracking and imaging without leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If organic dyes are used to stain cells, then fluorescence signals can be obtained for cell imaging, but the dyes aggregate in aqueous media causing signal quenching and leakage from cells
Solution Approach 1:
The patent applies the AIE effect where aggregation, which traditionally causes quenching for conventional dyes, is converted into a beneficial effect that enhances fluorescence emission. The AIE-active luminogen specifically exhibits increased fluorescence when aggregated, transforming the harmful aggregation phenomenon into a useful feature for stable, long-term cell tracking without leakage.
2Illumination intensity
If high concentrations of dye are used to strengthen fluorescence signals, then imaging quality improves, but the dyes cause cell lysis and disrupt intracellular physiology
Solution Approach 1:
The patent changes the fundamental photophysical parameter of the staining agent from ACQ-type to AIE-type luminogen. This parameter change allows the use of high concentrations for strong fluorescence signals without the cytotoxic effects associated with conventional dyes, as the AIE-active compounds do not require high concentrations to maintain signal intensity and are inherently less toxic to living cells.
3Object-affected harmful factors
If low concentrations of dye are used to avoid cytotoxicity, then cell viability is maintained, but the fluorescence signals become weak and dyes are easily photobleached
Solution Approach 1:
The patent utilizes the AIE effect to convert the typically harmful aggregation phenomenon into a beneficial feature that provides strong fluorescence signals at low concentrations. The AIE-active luminogen forms aggregates inside cells that emit intense fluorescence, eliminating the need for high concentrations and thereby maintaining cell viability while providing robust imaging signals that are resistant to photobleaching.
4Duration of action of stationary object
If conventional fluorescent probes are used for long-term cell tracking, then cell imaging is achieved, but the probes leak from cells into culture media over time
Solution Approach 1:
The patent applies the AIE effect where aggregation enhances fluorescence emission, and the resulting AIE-active aggregates are retained within cells without leakage. The aggregation process itself, which creates the beneficial fluorescence enhancement, also results in stable intracellular retention of the luminogen, preventing leakage into culture media and enabling long-term tracking.
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 AIE-based nanoparticles provide strong, stable fluorescence signals that persist for multiple cell passages and generations, preventing contamination and allowing for precise tracking of specific cell lines, while maintaining cytocompatibility and avoiding photobleaching.
Implementation Method 1
fluorescent bioprobes comprising luminogen formed nanoparticles that exhibit aggregation-induced emission (AIE) properties
Implementation Method 2
The fluorescent molecules can readily pass through cell membranes, stain only the cell cytoplasm, and form highly emissive nanoaggregates in aqueous media
Data Source
AI summary
Fluorescent bioprobes comprising luminogen formed nanoparticles comprising luminogens with aggregation-induced emission (AIE) properties, which can be used for long-term cell tracking. The luminogens are nonemissive in organic solution but become highly emissive when aggregated in aqueous solution. The fluorescent molecules can readily pass through cell membranes, stain only the cell cytoplasm, and form highly emissive nanoaggregates in aqueous media without any obvious cytoxicity in the living cells. Furthermore, the molecules can be retained inside the cells without noticeable leakage to the outside. Therefore, these AIE-based compounds can be used as selective and cell-compatible fluroescent bioprobes for long-term live cell tracking and imaging.