Journal
ANALYTICAL CHEMISTRY
Volume 91, Issue 14, Pages 9049-9057Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.analchem.9b01343
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Funding
- National Natural Science Foundation of China [21525522, 21705039]
- Foundation for Innovative Research Groups of NSFC [21521063]
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The enzymatic amplification strategy in living cells faces challenges of highly efficient intracellular codelivery of amplification reagents including DNA polymerase. In this work, we develop biomineralized metal-organic framework nanoparticles (MOF NPs) as a carrier system for intracellular codelivery of phi 29 DNA polymerase (phi 29DP) and nucleic acid probes and realize a polymerization amplification reaction in living cells. A pH-sensitive biodegradable MOF NP of zeolitic imidazolate framework-8 (ZIF-8) is utilized to encapsulate phi 29DP and adsorb nucleic acid probes. After uptake into cells, the encapsulated phi 29DP and surface-adsorbed DNA probes are released and escaped from endolysosomes. In the presence of phi 29DP and deoxyribonucleotide triphosphates (dNTPs), the intracellular miRNA-21 triggers a rolling circle amplification (RCA) reaction and the autonomous synthesized Mg2+-dependent DNAzyme cleaves the fluorogenic substrate, providing a readout fluorescence signal for the monitoring of miRNA-21. This is the first example of the intracellular RCA reaction in living cells. Therefore, the proposed method provides new opportunities for achieving enzymatic amplification reaction in living cells.
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