Solid-Phase Synthesis as a Tool to Create Exactly Defined, Branched Polymer Vectors for Cell Membrane Targeting.

Area of Science:

• Polymer Chemistry
• Biomaterials Science
• Drug Delivery Systems

Background:

• Modern drug formulations require auxiliaries to enhance pharmacological properties.
• Biocompatible polymers covalently linked to drugs can improve solubility, reduce toxicity, and enable targeted delivery.
• Localizing drugs near cell membranes is crucial for targeting membrane-bound proteins effectively.

Purpose of the Study:

• To synthesize highly defined, branched polymeric structures with membrane-binding properties.
• To create versatile polymeric architectures for potential use as drug auxiliaries.
• To investigate the interaction of these novel polymers with biological membranes and cells.

Main Methods:

• Solid-phase peptoid synthesis using a two-step iterative protocol.
• Covalent attachment of hydrophilic side chains (poly(ethylene oxide) or poly(2-ethyloxazoline)) to a peptoid backbone.
• Introduction of functional groups, such as hydrophobic anchors for membrane attachment.
• Characterization of branched polymers up to approximately 7000 g mol⁻¹.
• In vitro evaluation using liposomes, HEK293 and U251-MG cell lines, and red blood cells.

Main Results:

• Successful synthesis of precisely defined, branched polymers with tunable properties.
• Demonstration of membrane-binding capabilities through interactions with liposomes and cell lines.
• Versatility of the synthesis method for generating multifunctional polymeric structures.
• Confirmation of potential value as drug auxiliaries with cell membrane affinity.

Conclusions:

• Developed a versatile method for synthesizing branched polymers with membrane-binding properties.
• Demonstrated the potential of these polymers as drug auxiliaries for enhanced drug delivery.
• Highlighted the precise control over polymer structure achievable through solid-phase synthesis.