Arginine-rich, cell penetrating peptide-anti-microRNA complexes decrease glioblastoma migration potential

Area of Science:

• Molecular Biology
• Biochemistry
• Genetics

Background:

• MicroRNAs (miRNAs) are crucial gene regulators involved in numerous human diseases.
• Dysregulated miRNA expression necessitates effective delivery systems for therapeutic intervention.
• Cell-penetrating peptides (CPPs) are explored for delivering nucleic acids, but their efficacy with anti-miRNAs is less understood.

Purpose of the Study:

• To evaluate the R8 peptide as a delivery vehicle for single-stranded anti-miRNAs.
• To assess the intracellular delivery efficiency and endosomal escape of anti-miRNA/R8 complexes.
• To investigate the therapeutic potential of anti-miR-21/R8 complexes in glioblastoma.

Main Methods:

• Complexation of single-stranded anti-miRNA with the R8 peptide.
• Quantification of anti-miRNA/R8 complex association with cells.
• Assessment of endosomal/lysosomal escape of delivered anti-miRNA.
• Evaluation of downstream gene upregulation and glioblastoma cell migration inhibition.

Main Results:

• The R8 peptide successfully condensed both siRNA and anti-miRNA.
• Over 50% of cells showed association with anti-miRNA/R8 complexes, with 68% achieving endosomal escape.
• Administration of anti-miR-21 using R8 peptide led to efficient gene upregulation.
• Glioblastoma cell migration was reduced by 25% compared to controls.

Conclusions:

• Octaarginine (R8) peptide is an effective carrier for intracellular delivery of single-stranded anti-miRNAs.
• The anti-miR-21/R8 complex demonstrates functional miRNA modulation and inhibits glioblastoma cell migration.
• This study establishes a foundation for using R8 as a carrier for anti-miRNA therapeutics.