Related Experiment Video
Updated: Jul 17, 2026
06:15
Wet Chemistry and Peptide Immobilization on Polytetrafluoroethylene for Improved Cell-adhesion
Published on: August 15, 2016
Cell adhesion on nanofibrous polytetrafluoroethylene (nPTFE)
Kristy M Ainslie1, Eric M Bachelder, Sachin Borkar
1Department of Chemical Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, USA.
Langmuir : the ACS Journal of Surfaces and Colloids
|January 11, 2007
Summary
This study investigates the in vitro biocompatibility of nanostructured PTFE (nPTFE) for medical implants. Results show nPTFE is nonimmunogenic, with cell death likely due to apoptosis, suggesting reduced foreign body giant cell (FBGC) formation.
Area of Science:
- Biomaterials Science
- Nanotechnology
- Immunology
Background:
- The foreign body response (FBR) to implanted devices involves macrophages and foreign body giant cells (FBGCs), leading to fibrous capsule formation.
- Nanostructured surfaces offer potential for improved biocompatibility by modulating host reactions.
- Polytetrafluoroethylene (PTFE) is a common biomaterial, but its nanostructured form (nPTFE) requires biocompatibility evaluation.
Purpose of the Study:
- To evaluate the in vitro biocompatibility of a novel nanostructured PTFE (nPTFE) surface.
- To assess protein adsorption, cell adhesion, viability, and inflammatory cytokine profiles on nPTFE.
- To determine the potential of nPTFE to prevent adverse host reactions to implanted devices.
Main Methods:
- Coating glass surfaces with nPTFE (20-30 nm width) produced by jet-blowing PTFE 601A.
- Quantifying bovine serum albumin (BSA) adsorption.
- Assessing endothelial cell and macrophage adhesion and viability.
- Analyzing 18 cytokines in macrophage supernatant using Luminex assay, with lipopolysaccharide (LPS) as a positive control.
Main Results:
- nPTFE adsorbed significantly more BSA (495 +/- 100 ng/cm2) than planar PTFE, attributed to increased hydrophobicity and surface area.
- Endothelial cells and macrophages exhibited reduced spreading and viability on nPTFE compared to tissue culture polystyrene (TCPS), with high dead-to-live cell ratios.
- Cytokine analysis indicated nPTFE is nonimmunogenic, with low levels of pro-inflammatory cytokines (IL-1, TNF-alpha, IFN-gamma, IL-5).
- Reduced production of IL-1, IL-6, IL-4, and GM-CSF suggests potentially decreased FBGC formation on nPTFE.
Conclusions:
- The observed cell death on nPTFE is likely apoptotic, resulting from the inability of cells to spread on the nanostructured surface.
- nPTFE demonstrates nonimmunogenic properties in vitro, suggesting a reduced inflammatory response.
- The nanostructure of nPTFE may mitigate foreign body giant cell (FBGC) formation, indicating potential for improved implant biocompatibility.
