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Vascularization and tissue infiltration of a biodegradable polyurethane matrix
Sudhakar R Ganta1, Nicholas P Piesco, Ping Long
1Biomechanics and Tissue Engineering Laboratory, Department of Oral Medicine and Pathology, 589 Salk Hall, University of Pittsburgh, Pittsburgh, Pennsylvania 15261-1964, USA.
Journal of Biomedical Materials Research. Part A
|January 11, 2003
Summary
This study developed a novel, nontoxic, biodegradable polyurethane matrix using pentane diisocyanate (PDI) and sucrose. The spongy material demonstrated excellent biocompatibility and tissue integration, showing promise for tissue engineering applications.
Area of Science:
- Biomaterials Science
- Polymer Chemistry
- Tissue Engineering
Background:
- Polyurethanes are widely used in biomedical fields due to their biocompatibility.
- Current applications are limited to bioresistant polyurethanes.
- Development of nontoxic, biodegradable polyurethanes is needed for advanced applications.
Purpose of the Study:
- To synthesize and characterize a novel nontoxic, biodegradable polyurethane matrix.
- To evaluate the tissue compatibility and degradation profile of the new material.
- To assess its potential for tissue engineering applications.
Main Methods:
- Synthesized a microtextured spongy urethane matrix using pentane diisocyanate (PDI) and sucrose.
- Investigated biodegradability in vitro (37°C aqueous solution) and in vivo.
- Assessed mechanical properties (Tg = 67°C) and porosity (10–2000 µm).
- Evaluated cell adherence and proliferation (bone-marrow stromal cells, chondrocytes) in vitro.
- Performed in vivo subdermal implantation studies to assess toxicity and host response.
Main Results:
- The PDI-sucrose matrix exhibited biodegradability in vitro and in vivo.
- The polymer demonstrated mechanical stability at body temperature with a Tg of 67°C.
- The porous structure (100–300 µm pores) supported cell adherence and proliferation.
- Degradation products were nontoxic to cells in vitro.
- Subdermal implants showed no acute toxicity or inflammation, with evidence of vascular and connective tissue infiltration.
- Foreign-body giant cells were observed, suggesting degradation via hydrolysis and cellular activity.
Conclusions:
- The developed PDI-sucrose polyurethane matrix is nontoxic, biodegradable, and biocompatible.
- Its porous microtexture and mechanical properties support cell growth and tissue integration.
- The material shows significant potential for various tissue-engineering applications due to its favorable degradation and tissue compatibility profile.