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Cell Membrane-Anchored AND Logic Gate Aptasensor for Tumor Cell-Specific Imaging with Improved Accuracy
Biao Chen1, Lanlin Qi1, Yuchen Wu1
1State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Biology, College of Chemistry and Chemical Engineering, Key Laboratory for Bio-Nanotechnology and Molecule Engineering of Hunan Province, Hunan University, Changsha 410082, China.
This study introduces a novel DNA aptasensor using an "AND" logic gate for precise cancer cell detection. The sensor accurately identifies tumor cells by responding to both acidic environments and extracellular ATP, improving diagnostic specificity.
Area of Science:
- Biomedical Engineering
- Molecular Diagnostics
- Nanotechnology
Background:
- Accurate tumor cell imaging is crucial for early cancer diagnosis and treatment.
- Existing aptamer-based fluorescence sensors face challenges with specificity and sensitivity due to false positives and off-tumor detection.
- Single-biomarker aptasensors often compromise diagnostic accuracy.
Purpose of the Study:
- To develop a sequential response aptasensor for precise cancer cell identification.
- To enhance cancer imaging specificity and sensitivity using a DNA 'AND' logic gate.
- To create a dual-stimuli-responsive nanodevice for accurate tumor cell diagnosis.
Main Methods:
- Designed a Y-shaped DNA structure (Y-ALGN) composed of P-strand, L-strand (with ATP aptamer), and R-strand (for cell anchoring).
- Engineered the sensor to respond sequentially to an acidic tumor microenvironment (proton detection) and extracellular ATP.
- Utilized an 'AND' logic gate mechanism for signal activation only upon detection of both stimuli.
Main Results:
- The Y-ALGN aptasensor demonstrated high accuracy in distinguishing MCF-7 cancer cells from normal cells.
- Sequential activation by protons and ATP restored fluorescence specifically on target cancer cell membranes.
- The 'AND' logic gate computation significantly improved specificity and reduced false positives.
Conclusions:
- The developed Y-ALGN aptasensor offers a precise and sensitive method for cancer cell identification.
- This dual-stimuli-responsive nanodevice represents a novel approach for accurate tumor diagnosis.
- The 'AND' logic gate strategy enhances the reliability of aptasensor-based bioimaging.
