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A Photoresponsive and Metal-Organic Framework Encapsulated DNA Tetrahedral Entropy-Driven Amplifier for
Jia-Ling Gao1, Liu Yuheng1, Jun-Xian Liu1
1Hubei Province Key Laboratory of Occupational Hazard Identification and Control, School of Public Health, Medical College, Wuhan University of Science and Technology, Wuhan 430065, People's Republic of China.
Analytical Chemistry
|December 2, 2021
Summary
This study introduces a novel fluorescent biosensor for imaging microRNAs in cancer cells. The enhanced design improves stability, cell uptake, and accuracy for precise intracellular detection.
Area of Science:
- Biomedical Engineering
- Molecular Diagnostics
- Nanotechnology
Background:
- High-performance fluorescent biosensors are crucial for intracellular microRNA imaging in cancer medicine.
- Current entropy-driven reaction-assisted strategies suffer from poor biostability, low cell uptake, and limited accuracy.
- Addressing these limitations is essential for advancing cancer diagnostics and therapeutics.
Purpose of the Study:
- To develop an improved fluorescent biosensor for sensitive and accurate intracellular microRNA detection.
- To overcome the limitations of existing biosensing platforms, including stability, cellular internalization, and specificity.
- To create a versatile imaging toolbox for real-time monitoring of microRNAs in living cells.
Main Methods:
- DNA tetrahedron scaffolds were used to enhance enzyme resistance of DNA probes.
- ZIF-8 nanoparticles served as a delivery vehicle for improved cell endocytosis.
- A photocleavage-linker triggered photoresponsive mechanism enabled precise target identification under UV light.
Main Results:
- The novel biosensor demonstrated high sensitivity for microRNA-196a detection, down to 2.7 pM.
- The system exhibited the ability to distinguish single-base variations in microRNA sequences.
- The biosensor successfully performed intracellular imaging and target determination in living cells.
Conclusions:
- The developed DNA tetrahedron-based, photoresponsive biosensor offers enhanced biostability and cellular uptake.
- This platform provides a sensitive and accurate tool for intracellular microRNA imaging, with potential applications in cancer research.
- The biosensor represents a promising advancement for intracellular sensing and molecular diagnostics.
