Multi-Functional Peptide-MicroRNA Nanocomplex for Targeted MicroRNA Delivery and Function Imaging.

Area of Science:

• Biotechnology
• Molecular Biology
• Nanomedicine

Background:

• Developing effective microRNA (miRNA)-based therapeutics faces challenges in targeted delivery and real-time functional monitoring.
• Current methods struggle to achieve precise delivery to specific cells or tissues and to visualize miRNA activity at the molecular level.

Purpose of the Study:

• To develop a simultaneous solution for targeted miRNA delivery and real-time functional monitoring.
• To create a self-assembled nanocomplex using miRNA mimics and a multi-functional peptide conjugate.

Main Methods:

• Formation of a self-assembled nanocomplex using tumor-suppressive miR-34a and a multi-functional peptide conjugate (FA-R9-FPcas3).
• Demonstration of target-selective delivery of miR-34a into HeLa cells and tumors.
• Integration of an activatable fluorescence probe for real-time imaging of intracellular miRNA function (upregulation of active Caspase-3).

Main Results:

• Highly efficient and target-selective delivery of miR-34a was achieved in vitro and in vivo.
• Real-time imaging confirmed the intracellular biological function of delivered miR-34a by visualizing active Caspase-3 upregulation.
• The nanocomplex demonstrated significant therapeutic efficacy, inducing apoptosis in HeLa cells and suppressing tumor growth in mice.

Conclusions:

• The developed self-assembled nanocomplex effectively addresses the challenges of targeted miRNA delivery and real-time functional monitoring.
• This approach holds promise for advancing miRNA-based therapeutics by enabling precise delivery and in situ validation of miRNA activity.
• The study highlights the potential of multi-functional peptide conjugates in creating sophisticated nanomedicines for cancer therapy.