Cell-Penetrating Peptide Induced Superstructures Triggering Highly Efficient Antibacterial Activity.

Area of Science:

• Biomaterials Science
• Nanotechnology
• Antimicrobial Research

Background:

• Developing non-antibacterial molecules with potent bactericidal activity is a significant challenge.
• Cell-penetrating peptides and surfactants are explored for novel antimicrobial strategies.

Purpose of the Study:

• To investigate the synergistic antibacterial activity of octa-arginine (R8) and sodium dodecyl sulfate (SDS).
• To explore the self-assembly mechanisms and antibacterial efficacy of R8/SDS complexes against Gram-negative and Gram-positive bacteria.

Main Methods:

• Supramolecular self-assembly of R8 and SDS based on charge ratio (CR).
• Characterization of R8/SDS aggregates (wormlike micelle, lamellar structures).
• Assessment of antibacterial activity against Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus).
• In vivo wound healing experiments to evaluate efficacy and biological effects.

Main Results:

• R8/SDS complexes, particularly lamellar aggregates, exhibit high antibacterial activity.
• Distinct mechanisms of bacterial killing observed: membrane disruption for E. coli and membrane penetration for S. aureus.
• In vivo studies demonstrated accelerated wound healing with reduced inflammation and promoted angiogenesis.

Conclusions:

• Synergistic interaction between cell-penetrating peptides (R8) and anionic amphiphiles (SDS) triggers high bactericidal activity.
• R8/SDS lamellar aggregates represent a promising new strategy for highly efficient and targetable antibacterial applications.
• This approach offers a novel pathway beyond traditional antibiotics for combating bacterial infections.