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Semipermeable Functional DNA-Encapsulated Nanocapsules as Protective Bioreactors for Biosensing in Living Cells.
Cheng-Yi Hong1,2, Shu-Xian Wu1, Shi-Hua Li1
1MOE Key Laboratory for Analytical Science of Food Safety and Biology, Fujian Provincial Key Laboratory of Analysis and Detection Technology for Food Safety, State Key Laboratory of Photocatalysis on Energy and Environment, College of Chemistry, Fuzhou University , Fuzhou 350002, China.
Poly(methacrylic acid) nanocapsules enhance DNA nanosensor performance in living cells by improving cellular uptake and reducing false positives. These biocompatible capsules enable accurate in situ monitoring of biological processes.
Area of Science:
- Biotechnology
- Nanotechnology
- Molecular Biology
Background:
- DNA-based nanosensors face challenges like poor cellular uptake, degradation, and false positives in living cells.
- Existing nanosensor designs struggle with stability and specificity within complex cellular environments.
Purpose of the Study:
- To develop a novel nanocapsule system for encapsulating functional DNA for sensing applications in living cells.
- To overcome limitations of free DNA-based nanosensors, including cellular uptake, stability, and accuracy.
Main Methods:
- Designed selectively permeable poly(methacrylic acid) (PMA) nanocapsules to encapsulate functional DNA.
- Investigated nanocapsule properties including cellular uptake, DNA protection, and selective permeability.
- Evaluated nanosensor performance in vitro and in living cells for metal ion and small-molecule detection.
Main Results:
- PMA nanocapsules significantly improved cellular uptake and protected encapsulated DNA from degradation.
- Selective shell permeability allowed target diffusion while blocking large biomolecules like nucleases.
- Nanosensors encapsulated in PMA nanocapsules demonstrated reduced false positives and enhanced detection accuracy compared to free DNAzymes.
Conclusions:
- PMA nanocapsules offer a robust platform for developing advanced DNA-based nanosensors for intracellular applications.
- The nanocapsule system enhances sensor performance, stability, and accuracy, enabling reliable in situ monitoring.
- This technology is adaptable for detecting various biomolecules, including microRNAs, peptides, and metabolites, in living systems.
