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Multi-Scale Modification of Metallic Implants With Pore Gradients, Polyelectrolytes and Their Indirect Monitoring In vivo
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Modulation of cellular responses on engineered polyurethane implants.

Anand Khandwekar1, Cho K Rho

  • 1Department of Bioengineering, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA. anandk@mit.edu

Journal of Biomedical Materials Research. Part A
|April 12, 2012
PubMed
Summary
This summary is machine-generated.

Polyurethane surface chemistry impacts biological responses in vivo. Zwitterionic and anionic surfaces reduce protein adsorption and inflammation, while promoting cellular apoptosis, unlike cationic surfaces.

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Area of Science:

  • Biomaterials Science
  • Surface Chemistry
  • Immunology

Background:

  • Polyurethane materials are widely used in biomedical applications.
  • Understanding surface chemistry's role in biological interactions is crucial for material design.
  • Current research lacks comprehensive in vivo data on polyurethane surface effects on cellular responses.

Purpose of the Study:

  • To investigate the in vivo effects of zwitterionic, anionic, and cationic polyurethane surface chemistries.
  • To evaluate protein adsorption, macrophage behavior, apoptosis, and cytokine profiles.
  • To correlate surface properties with cellular responses and inflammatory markers.

Main Methods:

  • Development of polyurethanes with distinct surface chemistries (zwitterionic, anionic, cationic).
  • In vivo rat cage implant system to assess biological interactions.
  • Analysis of protein adsorption, cell adhesion, foreign-body giant cell (FBGC) formation, apoptosis (Annexin V-FITC), and cytokine expression (real-time PCR).

Main Results:

  • Zwitterionic and anionic surfaces significantly reduced protein adsorption compared to cationic surfaces.
  • Anionic and zwitterionic surfaces increased cellular apoptosis, while cationic surfaces promoted macrophage adhesion and FBGC formation.
  • Differential cytokine responses observed: cationic surfaces stimulated TNF-α and IL-4, while zwitterionic/anionic surfaces suppressed them.

Conclusions:

  • Zwitterionic and anionic polyurethane surface chemistries effectively reduce nonspecific adhesion, fusion, and inflammation in vivo.
  • These chemistries also promote cellular apoptosis, offering a potential strategy for modulating foreign body responses.
  • Surface chemistry is a critical determinant of polyurethane performance in biological environments.