title: Recombinant spider silk with cell binding motifs for specific adherence of cells.
abstract: Silk matrices have previously been shown to possess general properties governing cell viability. However, many cell types also require specific adhesion sites for successful in vitro culture. Herein, we have shown that cell binding motifs can be genetically fused to a partial spider silk protein, 4RepCT, without affecting its ability to self-assemble into stable matrices directly in a physiological-like buffer. The incorporated motifs were exposed in the formed matrices, and available for binding of integrins. Four different human primary cell types; fibroblasts, keratinocytes, endothelial cells and Schwann cells, were applied to the matrices and investigated under serum-free culture conditions. Silk matrices with cell binding motifs, especially RGD, were shown to promote early adherence of cells, which formed stress fibers and distinct focal adhesion points. Schwann cells acquired most spread-out morphology on silk matrices with IKVAV, where significantly more viable cells were found, also when compared to wells coated with laminin. This strategy is thus suitable for development of matrices that allow screening of various cell binding motifs and their effect on different cell types.
authors.affiliation: Department of Anatomy, Physiology and Biochemistry, Swedish University of Agricultural Sciences, The Biomedical Centre, S-75123 Uppsala, Sweden.
authors.forename: Mona
authors.initials: M
authors.lastname: Widhe
authors.forename: Ulrika
authors.initials: U
authors.lastname: Johansson
authors.forename: Carl-Olof
authors.initials: CO
authors.lastname: Hillerdahl
authors.forename: My
authors.initials: M
authors.lastname: Hedhammar
mesh_terms: D000818:Animals; D002448:Cell Adhesion / Q000187:drug effects; D002470:Cell Survival / Q000187:drug effects; D002478:Cells, Cultured; D042783:Endothelial Cells / Q000166:cytology / Q000187:drug effects; D005347:Fibroblasts / Q000166:cytology / Q000187:drug effects; D006801:Humans; D015603:Keratinocytes / Q000166:cytology / Q000187:drug effects; D047011:Silk / Q000737:chemistry / Q000494:pharmacology*; D013112:Spiders / Q000737:chemistry*; D016596:Vinculin / Q000494:pharmacology
chemical_list: D047011:Silk; D016596:Vinculin
keywords: Cell adhesion; Cell culture matrices; Integrin; Spider silk