Solid-phase ATRP synthesis of peptide-polymer hybrids

Area of Science:

• Polymer Chemistry
• Biomaterials Science
• Surface Chemistry

Background:

• Developing advanced biomaterials with controlled molecular architecture is crucial for regulating biological interactions.
• Peptide functionalization of polymers can impart specific biological signaling capabilities.
• Solid-phase synthesis offers advantages for creating well-defined polymer structures.

Purpose of the Study:

• To establish a versatile methodology for preparing hybrid biomaterials via atom transfer radical polymerization (ATRP) from resin-supported peptides.
• To synthesize and characterize a GRGDS-functionalized polymer using this novel solid-phase approach.
• To evaluate the cell adhesion properties of the synthesized peptide-polymer conjugate.

Main Methods:

• Atom transfer radical polymerization (ATRP) from resin-supported peptides.
• Synthesis of GRGDS-functionalized poly(2-hydroxyethyl methacrylate) (PHEMA).
• Characterization using solid-state (13)C NMR and Gel Permeation Chromatography (GPC).
• Cell adhesion experiments to assess biological activity.

Main Results:

• Successful synthesis of a GRGDS-functionalized polymer with a number average molecular weight of 4420 and a polydispersity of 1.47.
• ATRP reaction confirmed to be effective from a peptide-conjugated solid support, with near-quantitative synthesis.
• Demonstrated GRGDS sequence-promoted cell adhesion, unlike unfunctionalized PHEMA.
• Validated the ability to incorporate cell-signaling moieties into materials with defined molecular architecture.

Conclusions:

• A versatile solid-phase methodology for preparing hybrid biomaterials using ATRP from resin-supported peptides has been established.
• The synthesized GRGDS-functionalized polymer effectively promotes cell adhesion, demonstrating the potential for controlled biomaterial-cell interactions.
• This approach allows for the precise incorporation of cell-signaling moieties into polymeric materials, paving the way for advanced tissue engineering and regenerative medicine applications.