Niosome-Assisted Delivery of DNA Fluorescent Probe with Optimized Strand Displacement for Intracellular MicroRNA21...

Area of Science:

• Biochemistry
• Molecular Biology
• Nanotechnology

Background:

• MicroRNAs are crucial in cancer development and serve as potential early diagnostic biomarkers.
• Accurate detection of specific microRNAs within cells is vital for cancer research and diagnostics.

Purpose of the Study:

• To develop a novel biosensing system for sensitive and specific fluorescence imaging of microRNA21 (miR21) in cancer cells.
• To create an efficient intracellular delivery method for a double-stranded DNA (dsDNA) based miR21 probe.

Main Methods:

• Designed an "off-on" dsDNA fluorescent probe utilizing fluorescence energy resonance transfer (FRET) for miR21 detection via strand displacement.
• Synthesized niosomes (SPN) composed of Span 80 and DOTAP for electrostatic loading and intracellular delivery of dsDNA probes.
• Optimized dsDNA probe design for enhanced accuracy and sensitivity in miR21 recognition.

Main Results:

• The dsDNA probe demonstrated high accuracy and sensitivity for miR21 detection.
• The SPN carrier efficiently delivered dsDNA probes into cells with good biosafety.
• The SPN/dsDNA system successfully achieved miR21 fluorescent imaging in living cells, discriminating between cancer (MCF-7) and normal (L-02) cells.

Conclusions:

• The SPN/dsDNA system provides a powerful tool for intracellular microRNA biosensing.
• This novel system holds significant promise for the early diagnosis of cancer through sensitive miRNA detection.