In vitro assessment of bioactive coatings for neural implant applications

Stephen Massia, Matthew M. Holecko, Gholam R. Ehteshami

Research output: Contribution to journalArticle

85 Scopus citations

Abstract

Recent efforts in our laboratory have focused on developing methods for immobilizing bioactive peptides to low cell-adhesive dextran monolayer coatings and promoting biospecific cell adhesion for biomaterial implant applications. In the current study, this dextran-based bioactive coating technology was developed for silicon, polyimide, and gold, the base materials utilized to fabricate our prototype neural implants. Chemical composition of all modified surfaces was verified by X-ray photoelectron spectroscopy (XPS). We observed that surface-immobilized dextran supported very little cell adhesion in vitro (24-h incubation with serum-supplemented medium) on all base materials. Inactive nonadhesion-promoting Gly-Arg-Ala-Asp-Ser-Pro peptides immobilized on dextran-coated materials promoted adhesion and spreading at low levels not significantly different from dextran-coated substrates. Arg-Gly-Asp (RGD) peptide-grafted surfaces were observed to promote substantial fibroblast and glial cell adhesion with minimal PC12 (neuronal cell) adhesion. In contrast, dextran-coated materials with surface-grafted laminin-based, neurite-promoting Ile-Lys-Val-Ala-Val (IKVAV) peptide promoted substantial neuron cell adhesion and minimal fibroblast and glial cell adhesion. It was concluded that neuron-selective substrates are feasible using dextran-based surface chemistry strategies. The chemical surface modifications could be utilized to establish a stable neural tissue-implant interface for long-term performance of neural prosthetic devices.

Original languageEnglish (US)
Pages (from-to)177-186
Number of pages10
JournalJournal of Biomedical Materials Research - Part A
Volume68
Issue number1
DOIs
StatePublished - Jan 1 2004

Keywords

  • Biospecific cell adhesion
  • Engineered biomaterials
  • Neural prosthetics
  • Surface modification

ASJC Scopus subject areas

  • Ceramics and Composites
  • Biomaterials
  • Biomedical Engineering
  • Metals and Alloys

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