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Surface Functionalization of Poly(l-lactide-co-glycolide) Membranes with RGD-Grafted Poly(2-oxazoline) for

Anna M Tryba1, Małgorzata Krok-Borkowicz1, Michał Kula1

  • 1Department of Biomaterials and Composites, Faculty of Materials Science and Ceramics, AGH University of Science and Technology, Al. Mickiewicza 30, 30-059 Kraków, Poland.

Journal of Functional Biomaterials
|January 25, 2022
PubMed
Summary

New poly(l-lactide-co-glycolide) (PLGA) membranes, modified with arginine-glycine-aspartic acid (RGD) and poly(2-oxazoline) (POx), enhance bone cell adhesion and proliferation. These RGD-modified membranes show promise for guided tissue regeneration (GTR) in bone tissue engineering.

Keywords:
RGD sequencesbone tissue engineeringguided tissue regeneration (GTR)osteoblast-like cellsperiodontologyphase separationpoly(2-oxazoline)poly(ethylene glycol)poly(l-lactide-co-glycolide)

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Area of Science:

  • Biomaterials Science
  • Tissue Engineering
  • Periodontology

Background:

  • Periodontal disease often leads to bone tissue defects requiring treatment.
  • Guided tissue regeneration (GTR) uses barrier membranes to prevent soft tissue infiltration and support bone regeneration.
  • Existing membranes face challenges in optimizing soft tissue exclusion and bone support.

Purpose of the Study:

  • To design and fabricate a novel degradable poly(l-lactide-co-glycolide) (PLGA) membrane.
  • To surface-modify the PLGA membrane with arginine-glycine-aspartic acid (RGD) motifs via poly(2-oxazoline) (POx) coupling.
  • To evaluate the efficacy of these modified membranes for guided tissue regeneration (GTR) applications.

Main Methods:

  • Developed a novel method coupling RGD motifs with POx for membrane functionalization.
  • Fabricated RGD-containing membranes using solvent casting of PLGA, POx_RGD, and poly(ethylene glycol) (PEG).
  • Characterized membrane microstructure (SEM) and surface chemistry (XPS, FTIR-ATR); assessed osteoblast-like cell behavior (MG-63) via metabolic activity, live/dead staining, and actin staining.

Main Results:

  • Spectroscopic and surface analyses confirmed successful RGD coupling to POx and immobilization on PLGA membranes.
  • SEM revealed an asymmetric microstructure with a porous, high-surface-area side supporting bone regeneration and a less porous side for soft tissue exclusion.
  • PLGA membranes modified with POx_RGD demonstrated significantly higher bone cell adhesion, proliferation, and viability compared to unmodified or POx-only modified membranes.

Conclusions:

  • The developed RGD-modified PLGA membranes exhibit enhanced osteoblast-like cell response.
  • The asymmetric microstructure and surface modification contribute to improved cell behavior.
  • These membranes are promising candidates for guided tissue regeneration in periodontology and bone tissue engineering.