title: Ultrathin polymeric coatings based on hydrogen-bonded polyphenol for protection of pancreatic islet cells.
abstract: Though transplantation of pancreatic islet cells has emerged as a promising treatment for Type 1 diabetes its clinical application remains limited due to a number of limitations including both pathogenic innate and adaptive immune responses. We report here on a novel type of multifunctional cytoprotective material applied to coat living pancreatic islets. The coating utilizes hydrogen-bonded interactions of a natural polyphenol (tannic acid) with poly(N-vinylpyrrolidone) deposited on the islet surface via non-ionic layer-by-layer assembly. We demonstrate that the coating is conformal over the surface of mammalian islets including those derived from rat, non-human primate (NHP), and human. In contrast to unmodified controls, the coated islets maintain their viability and β-cell functionality for at least 96 hoursin vitro. We also determine that the coating demonstrates immunomodulatory cytoprotective properties suppressing pro-inflammatory cytokine synthesis in stimulated bone marrow-derived macrophages and diabetogenic BDC-2.5 T cells. The coating material combines high chemical stability under physiologically relevant conditions with capability of suppressing cytokine synthesis, crucial parameters for prolonged islet integrity, viability, and functionin vivo. Our study offers new opportunities in the area of advanced multifunctional materials to be used for a cell-based transplantation therapy.
authors.affiliation: Department of Chemistry, University of Alabama at Birmingham, Birmingham, AL 35294 (USA).
authors.forename: Veronika
authors.initials: V
authors.lastname: Kozlovskaya
authors.forename: Oleksandra
authors.initials: O
authors.lastname: Zavgorodnya
authors.forename: Yi
authors.initials: Y
authors.lastname: Chen
authors.forename: Kristin
authors.initials: K
authors.lastname: Ellis
authors.forename: Hubert M
authors.initials: HM
authors.lastname: Tse
authors.forename: Wanxing
authors.initials: W
authors.lastname: Cui
authors.forename: J Anthony
authors.initials: JA
authors.lastname: Thompson
authors.forename: Eugenia
authors.initials: E
authors.lastname: Kharlampieva
keywords: Antioxidant; Cytoprotective Coating; Hydrogen-Bonding; Immunomodulatory; Layer-by-Layer; Polyphenol
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