title: Biofunctionalization of electrospun PCL-based scaffolds with perlecan domain IV peptide to create a 3-D pharmacokinetic cancer model.
abstract: Because prostate cancer cells metastasize to bone and exhibit osteoblastic features (osteomimicry), the interrelationships between bone-specific microenvironment and prostate cancer cells at sites of bone metastasis are critical to disease progression. In this work the bone marrow microenvironment in vitro was recreated both by tailoring scaffolds physical properties and by functionalizing electrospun polymer fibers with a bioactive peptide derived from domain IV of perlecan heparan sulfate proteoglycan. Electrospun poly (epsilon-caprolactone) (PCL) fibers and PCL/gelatin composite scaffolds were modified covalently with perlecan domain IV (PlnDIV) peptide. The expression of tight junction protein (E-cadherin) and focal adhesion kinase (FAK) phosphorylation on tyrosine 397 also were investigated. The described bioactive motif significantly enhanced adherence and infiltration of the metastatic prostate cancer cells on all modified electrospun substrates by day 5 post-seeding. Cells cultured on PlnDIV-modified matrices organized stress fibers and increased proliferation at statistically significant rates. Additional findings suggest that presence of PlnDIV peptide in the matrix reduced expression of tight junction protein and binding to PlnDIV peptide was accompanied by increased focal adhesion kinase (FAK) phosphorylation on tyrosine 397. We conclude that PlnDIV peptide supports key signaling events leading to proliferation, survival, and migration of C4-2B cancer cells; hence its incorporation into electrospun matrix is a key improvement to create a successful three-dimensional (3-D) pharmacokinetic cancer model.
authors.affiliation: Department of Materials Science and Engineering, University of Delaware, Newark, DE 19716, USA. ohartman@udel.edu
authors.forename: Olga
authors.initials: O
authors.lastname: Hartman
authors.forename: Chu
authors.initials: C
authors.lastname: Zhang
authors.forename: Elizabeth L
authors.initials: EL
authors.lastname: Adams
authors.forename: Mary C
authors.initials: MC
authors.lastname: Farach-Carson
authors.forename: Nicholas J
authors.initials: NJ
authors.lastname: Petrelli
authors.forename: Bruce D
authors.initials: BD
authors.lastname: Chase
authors.forename: John F
authors.initials: JF
authors.lastname: Rabolt
mesh_terms: D001672:Biocompatible Materials / Q000378:metabolism; D001853:Bone Marrow / Q000033:anatomy & histology / Q000378:metabolism; D015820:Cadherins / Q000378:metabolism; D002448:Cell Adhesion; D045744:Cell Line, Tumor; D049109:Cell Proliferation; D055664:Electrochemical Techniques; D051416:Focal Adhesion Protein-Tyrosine Kinases / Q000378:metabolism; D005780:Gelatin / Q000737:chemistry; D019812:Heparan Sulfate Proteoglycans / Q000737:chemistry*; D006801:Humans; D008297:Male; D008954:Models, Biological; D015394:Molecular Structure; D009362:Neoplasm Metastasis; D010455:Peptides / Q000737:chemistry*; D011091:Polyesters / Q000737:chemistry*; D016062:Porosity; D011471:Prostatic Neoplasms / Q000378:metabolism / Q000473:pathology*; D019108:Tight Junctions / Q000378:metabolism; D054457:Tissue Scaffolds / Q000737:chemistry*
chemical_list: D001672:Biocompatible Materials; D015820:Cadherins; D019812:Heparan Sulfate Proteoglycans; D010455:Peptides; D011091:Polyesters; C071927:perlecan; C016240:polycaprolactone; D005780:Gelatin; D051416:Focal Adhesion Protein-Tyrosine Kinases