Activating Peptides for Cellular Uptake via Polymerization into High Density Brushes.

Area of Science:

• Biomaterials Science
• Polymer Chemistry
• Drug Delivery

Background:

• Peptide therapeutics are limited by poor cell penetration, hindering access to intracellular targets.
• Developing effective intracellular drug delivery systems remains a significant challenge in medicine.

Purpose of the Study:

• To develop a broadly applicable method for enhancing peptide therapeutic cell entry.
• To create a high-density brush polymer system for intracellular delivery of non-cell-penetrating peptides.

Main Methods:

• Modification of amino acid sequences with Arg/Lys and norbornenyl units.
• Polymerization of modified peptides using ring-opening metathesis polymerization (ROMP).
• Demonstration using a known non-cell-penetrating therapeutic peptide.

Main Results:

• The resulting brush polymer demonstrated proficient cell entry.
• The polymerized peptide maintained its crucial intracellular function after cell penetration.
• The strategy successfully rendered a non-cell-penetrating peptide cell-competent.

Conclusions:

• This polymerization strategy offers a simple and widely applicable solution for improving peptide therapeutic delivery.
• The method enhances the in vivo efficacy of peptide drugs by enabling intracellular access.
• This approach holds significant promise for advancing peptide-based medicine.