Designing Cell-Permeable Peptide Therapeutics That Enter the Cell by Endocytosis

Area of Science:

• Biochemistry
• Molecular Biology
• Drug Discovery

Background:

• Intracellular protein-protein interactions (PPIs) are challenging drug targets.
• Peptides are effective PPI inhibitors in vitro but struggle with cell membrane permeability.
• Cyclic cell-penetrating peptides (CPPs) offer a solution for intracellular delivery.

Purpose of the Study:

• To describe strategies for conjugating peptidyl cargoes with cyclic CPPs.
• To generate cell-permeable macrocyclic peptides for targeting intracellular PPIs.
• To develop metabolically stable and biologically active peptide therapeutics.

Main Methods:

• Conjugation of various peptidyl cargoes (linear, cyclic, stapled) with cyclic CPPs.
• Development of macrocyclic peptides for enhanced cell penetration.
• Assessment of metabolic stability and biological activity against intracellular targets.

Main Results:

• Successful generation of cell-permeable macrocyclic peptides.
• Demonstrated therapeutic potential against intracellular PPIs.
• Established CPPs as effective carriers for intracellular peptide delivery.

Conclusions:

• Cyclic CPPs facilitate the delivery of peptide therapeutics into the cell cytosol.
• Macrocyclic peptides conjugated with CPPs are promising for targeting intracellular PPIs.
• This approach enhances peptide drug efficacy and stability for treating diseases.