Cell-Penetrating Peptides Delivering siRNAs: An Overview

Area of Science:

• Biotechnology
• Molecular Biology
• Drug Delivery Systems

Background:

• Cell-Penetrating Peptides (CPPs) enable intracellular delivery of therapeutic molecules.
• Small interfering RNAs (siRNAs) are potent gene silencers but face delivery challenges due to membrane impermeability and short half-life.
• RNA interference (RNAi) pathway is a key target for therapeutic intervention.

Purpose of the Study:

• To review and assess various strategies for delivering siRNA into cells using CPPs.
• To compare different CPP-siRNA loading methods developed over the past two decades.
• To identify the most promising CPP-based siRNA delivery approaches for future clinical applications.

Main Methods:

• Overview of literature on CPP-mediated siRNA delivery.
• Categorization of delivery strategies into covalent conjugation, complex formation, and CPP-decorated nanocomplexes.
• Analysis of the advantages and disadvantages of each loading strategy.

Main Results:

• Covalent conjugation, complex formation, and CPP-decorated nanocomplexes are key CPP-siRNA loading strategies.
• Complex formation and CPP-decorated nanocomplexes are emerging as versatile and user-friendly methods.
• Recent advancements focus on targeted delivery to improve efficacy and reduce side effects.

Conclusions:

• CPP-mediated siRNA delivery holds significant promise for therapeutic applications.
• Complex formation and nanocomplex strategies offer practical advantages for siRNA delivery.
• Targeted delivery approaches are crucial for optimizing CPP-siRNA therapeutics in clinical settings.