An Entropy-Driven Tetrahedral Framework Nucleic Acid Circuit for Assessing Drug Response during Apoptosis through...

Area of Science:

• Biomedical Engineering
• Molecular Biology
• Nanotechnology

Background:

• Accurate monitoring of apoptosis biomarkers is crucial for cancer therapy drug response evaluation.
• Current methods may lack sensitivity or real-time feedback for dynamic apoptosis assessment.
• Intracellular microRNA-21 (miR-21) is a key biomarker in apoptosis and drug resistance.

Purpose of the Study:

• To develop a novel biosensing circuit for real-time monitoring of drug-induced apoptosis.
• To create a system that integrates drug delivery and response assessment.
• To enable dynamic imaging of intracellular miR-21 for evaluating cancer therapy efficacy.

Main Methods:

• Integration of an entropy-driven DNA strand displacement reaction (EDR) amplifier, an antisense oligonucleotide (ASO), and doxorubicin (Dox) into a tetrahedral framework nucleic acid (TFNA) scaffold (EDTF circuit).
• Internalization of the EDTF circuit into MCF-7 cells for intracellular miR-21 amplification and imaging.
• Spatially confined DNA strand displacement cascades to release a fluorophore for in situ imaging.
• Cooperative action of released ASO for P-glycoprotein (P-gp) suppression and Dox for chemotherapy to induce apoptosis.

Main Results:

• The EDTF circuit successfully amplified intracellular miR-21, enabling its dynamic imaging in MCF-7 cells.
• The system demonstrated cooperative induction of apoptosis through P-gp suppression and doxorubicin chemotherapy.
• The dynamic imaging of miR-21 correlated with the assessment of drug-induced apoptosis.

Conclusions:

• The developed EDTF circuit provides a modular platform for evaluating drug responses during cancer therapy.
• This approach enables real-time, in situ assessment of apoptosis by imaging miR-21.
• The strategy shows potential for broader applications in nucleic acid biomarker analysis, drug screening, and early antitumor therapy.