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Biocompatibility of poly(etherurethane urea) containing dehydroepiandrosterone
1Department of Macromolecular Science, Case Western Reserve University, Cleveland, Ohio 44106-7207, USA.
Journal of Biomedical Materials Research
|June 25, 1998
Summary
Dehydroepiandrosterone (DHEA) showed short-term anti-inflammatory effects in poly(etherurethane urea) (PEUU) implants. However, DHEA rapidly leached out, limiting its long-term impact on PEUU biocompatibility and biostability.
Area of Science:
- Biomaterials Science
- Polymer Chemistry
- Immunology
Background:
- Poly(etherurethane urea) (PEUU) elastomers are widely used in medical applications due to their favorable mechanical properties and biocompatibility.
- Long-term use of PEUU can lead to degradation of the ether soft segment.
- Antioxidants are typically added to mitigate degradation, but dehydroepiandrosterone (DHEA) offers an alternative mechanism by modulating macrophage activity.
Purpose of the Study:
- To investigate the in vivo and in vitro biocompatibility of PEUU incorporating dehydroepiandrosterone (DHEA).
- To evaluate the effect of DHEA on inflammatory responses and the long-term biostability of PEUU compared to vitamin E.
- To determine the dose-dependent effects and leaching characteristics of DHEA in PEUU implants.
Main Methods:
- PEUU samples with varying concentrations of DHEA (1%, 5%) and 5% vitamin E were implanted.
- Biocompatibility was assessed by analyzing inflammatory cellular exudate, macrophage adhesion, and foreign body giant cell (FBGC) formation.
- Material analysis included transmission infrared spectroscopy, attenuated total reflectance Fourier transform analysis, and scanning electron microscopy to evaluate DHEA leaching and PEUU biostability.
Main Results:
- The addition of 5% DHEA significantly reduced leukocyte exudate and macrophage adhesion/FBGC formation at early time points (4 and 7 days) compared to control and vitamin E groups.
- Despite initial anti-inflammatory effects, DHEA rapidly leached from PEUU samples, with over 70% lost within 3 days.
- DHEA did not enhance the long-term biostability of PEUU, unlike vitamin E, and its overall effect on biocompatibility was limited by its rapid diffusion.
Conclusions:
- DHEA exhibits short-term immunomodulatory effects on PEUU implants, reducing acute inflammatory responses.
- The rapid water-solubility and subsequent leaching of DHEA from PEUU significantly limit its potential for long-term enhancement of biocompatibility and biostability.
- Further research into DHEA delivery systems or more stable analogues may be necessary to harness its immunomodulatory potential in biomaterials.