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Macrophage-mediated biodegradation of poly(DL-lactide-co-glycolide) in vitro

Zhidao Xia1, Yizhong Huang, Iannis E Adamopoulos

  • 1Nuffield Department of Orthopaedic Surgery, The Botnar Research Centre, Institute of Musculoskeletal Sciences, University of Oxford, Oxford, United Kingdom.

Journal of Biomedical Materials Research. Part A
|July 4, 2006
PubMed

Insights

Macrophages and multinucleated giant cells (MNGCs) actively degrade poly-DL-lactide-co-glycolide (PLGA) surfaces. This study clarifies the role of these cells in the biodegradation of PLGA and its composites.

Area of Science:

  • Biomaterials Science
  • Cell Biology
  • Tissue Engineering

Background:

  • Biodegradation of poly-DL-lactide-co-glycolide (PLGA) is well-established.
  • The specific roles of macrophages and multinucleated giant cells (MNGCs) in PLGA biodegradation remain unclear.

Purpose of the Study:

  • To investigate macrophage-mediated biodegradation of PLGA thin films.
  • To examine the biodegradation of PLGA composites containing hydroxyapatite (HA) and tricalcium phosphate (TCP).
  • To analyze cellular interactions using in vitro models.

Main Methods:

  • Utilized a murine macrophage cell line (RAW 264.7) for in vitro studies.
  • Employed cell viability assays, scanning electron microscopy (SEM), and focused ion beam microscopy (FIB-SEM).
  • Assessed interactions with PLGA films and PLGA-HA, PLGA-TCP composites.

Main Results:

  • RAW 264.7 cells demonstrated effective attachment and proliferation on PLGA and its composites.
  • Macrophages aggregated and fused to form MNGCs on the material surfaces.
  • Cellular pseudopodia were observed to penetrate and erode the PLGA film surfaces.

Conclusions:

  • Macrophages and MNGCs actively interact with PLGA films.
  • These cells play a significant role in the surface biodegradation of PLGA.
  • Findings contribute to understanding cellular responses to biodegradable polymers.

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