In vitro and in vivo response to nanotopographically-modified surfaces of poly(3-hydroxybutyrate-co-3-hydroxyvalerate) and polycaprolactone

Gianluca Giavaresi, Matilde Tschon, John H. Daly, John J. Liggat, Duncan S. Sutherland, Hossein Agheli, Milena Fini, Paola Torricelli, Roberto Giardino

Research output: Contribution to journalArticlepeer-review

Abstract

Colloidal lithography and embossing master are new techniques of producing nanotopography, which have been recently applied to improve tissue response to biomaterials by modifying the surface topography on a nano-scale dimension. A natural polyester (Biopol™), 8% 3-hydroxyvalerate-component (D400G) and a conventional biodegradable polycaprolactone (PCL) were studied, both nanostructured and native forms, in vitro and in vivo. Nanopits (100-nm deep, 120-nm diameter) on the D400G surface were produced by the embossing master technique (Nano-D400G), while nanocylinders (160-nm height, 100-nm diameter) on the PCL surface were made by the colloidal lithography technique (Nano-PCL). L929 fibroblasts were seeded on polyesters, and cell proliferation, cytotoxic effect, synthetic and cytokine production were assessed after 72 h and 7 days. Then, under general anesthesia, 3 Sprague-Dawley rats received dorsal subcutaneous implants of nanostructured and native polyesters. At 1, 4 and 12 weeks the animals were pharmacologically euthanized and implants with surrounding tissue studied histologically and histomorphometrically. In vitro results showed significant differences between D400G and PCL in Interleukin-6 production at 72 h. At 7 days, significant (P <0.05) differences were found in Interleukin-1β and tumor necrosis factor-α release for Nano-PCL when compared to Nano-D400G, and for PCL in comparison with D400G. In vivo results indicated that Nano-D400G implants produced a greater extent of inflammatory tissue than Nano-PCL at 4 weeks. The highest vascular densities were observed for Nano-PCL at 4 and 12 weeks. Chemical and topographical factors seem to be responsible for the different behaviour, and from the obtained results a prevalence of chemistry on in vitro data and nanotopography on soft tissue response in vivo are hypothesized, although more detailed investigations are necessary in this field.

Original languageEnglish
Pages (from-to)1405-1423
Number of pages19
JournalJournal of Biomaterials Science, Polymer Edition
Volume17
Issue number12
DOIs
Publication statusPublished - Dec 2006

Keywords

  • Animal model
  • Fibroblast
  • Fibrous tissue
  • Nanotopography
  • Poly(hydroxybutyric acid)
  • Polycaprolactone

ASJC Scopus subject areas

  • Biophysics
  • Biomaterials

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