Versatile biomimetic conductive polypyrrole films doped with hyaluronic acid of different molecular weights. (15th October 2018)

• Record Type: Journal Article
• Authors: Kim, Semin; Jang, Yohan; Jang, Minsu; Lim, Ahyoun; Hardy, John G.; Park, Hyun S.; Lee, Jae Young
• Is Part Of: Acta biomaterialia. Volume 80(2018)
• Page Start: 258
• Page End: 268
• Publication Date: 2018-10-15
• Subjects: PPy polypyrrole -- HA hyaluronic acid -- PPy/HA Hyaluronic acid-doped polypyrrole -- MW molecular weight -- CPs Conductive polymers -- PEDOT Poly(3, 4-ethylenediowythiophene) -- ECM extracellular matrix -- HUVECs human umbilical cord endothelial cells -- ITO indium-tin-oxide -- QCM quartz crystal microbalance -- CV cyclic voltammetry -- XPS X-ray photoelectron spectroscopy -- AFM Atomic force microscopy -- KFPM Kelvin force probe mode -- TBO Toluidine Blue O -- WCA Water contact angle -- EMG electromyography; Conductive polymer -- Hyaluronic acid -- Molecular weight -- Cellular interactions -- Bioelectrodes; Biomedical materials -- Periodicals; 610.28
• DOI: 10.1016/j.actbio.2018.09.035
• Languages: English
• ISSNs: 1742-7061

Abstract

Graphical abstract: Abstract: Electrically conductive polypyrrole (PPy) is an intriguing biomaterial capable of efficient electrical interactions with biological systems. Especially, biomimetic PPy-based biomaterials incorporating biomolecules, such as hyaluronic acid (HA), can impart the characteristic biological interactions with living cells/tissues to the conductive biomaterials. Here we report the effects of the molecular weight (MW) of HA on PPy-based biomaterials. We utilized HA of a wide range of MW (35 × 10 3 Da–3 × 10 6 Da) as dopants during the electrochemical production of PPy/HA films and their characterization of materials and cellular interactions. With increases in the MWs of HA dopants, PPy/HA exhibited more hydrophilic, higher electrochemical activity and lower impedance. In vitro studies revealed that PPy films doped with low MW HA were supportive to cell adhesion and growth, while PPy films doped with high MW HA were resistant to cell attachment. Subcutaneous implantation of the PPy/HA films for 4 weeks revealed that all the PPy/HA films were tissue compatible. We successfully demonstrate the importance of HA dopant MWs in modulating the chemical and electrical properties of the materials and cellular responses to the materials. Such materials have potential for various biomedical applications, including as tissue engineering scaffolds and as electrodes for neural recording and neuromodulation. Statement of Significance: Hyaluronic acid (HA)-doped polypyrrole (PPy) films were electrochemically synthesized as novel biomimetic conductive materials capable of efficient electrical signaling and preferential biological interactions. Molecular weights (MWs) of HA varied in a wide range (35 × 10 3 –2 × 10 6 Da) and critically determine chemical, electrochemical, and biological properties of PPy/HA. Especially, PPy films with low MW HA markedly support cell adhesion and growth, while PPy films with high MW HA are resistant to cell attachment. Furthermore, PPy/HA exhibits greatly improved tissue compatibility and in vivo EMG signal recording ability. We for the first time demonstrate that biomimetic PPy/HA-based biomaterials can serve as versatile and effective platforms for various biomedical applications, such as tissue engineering scaffolds and bioelectrodes.