The effect of nanoscale surface electrical properties of partially biodegradable PEDOT-co-PDLLA conducting polymers on protein adhesion investigated by atomic force microscopy

Autor(es)

da Silva, Arua C. ^[1] ; Higgins, Michael J. ^[2] ; Cordoba de Torresi, Susana I. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Inst Quim, Ave Prof Lineu Prestes 748, BR-05508000 Sao Paulo, SP - Brazil

^[2] Univ Wollongong, Intelligent Polymer Res Inst, ARC Ctr Excellence Electromat Sci, Wollongong, NSW 2522 - Australia

• Tipo de documento: Artigo Científico
• Fonte: Materials Science & Engineering C-Materials for Biological Applications; v. 99, p. 468-478, JUN 2019.
• Citações Web of Science: 2

Resumo

This study used atomic force microscopy (AFM) to elucidate the interaction of fibronectin (FN) on a conducting and partially biodegradable copolymer of poly(3,4-ethylenedioxythiophene) and poly(D,L-lactic acid) (PEDOT-co-PDLLA) in three different proportions (1:05, 1:25 and 1:50). The copolymers with higher PEDOT:PDLLA content ratios (1:05 and 1:25) had higher surface roughness, water contact angle, with current and conductivity occurring at discrete large grain structures on the surface. In contrast, the lower PEDOT:PDLLA content ratio (1:50) did not show high conductivity grains but showed homogenous surface conductivity across the entire surface. Using FN-functionalized AFM probes, force measurements showed that the copolymers with higher PEDOT content (1:05 and 1:25) had significantly lower adhesion forces (similar to 0.2-0.3 nN), while the copolymer with the lower content of PEDOT (1:50) had stronger FN interactions with significantly higher adhesion forces of 1 nN. By correlating the spatially distributed electrical surfaces with FN interactions, we observed that the synthesis of 1:50 PEDOT:PDLLA produced more uniformly doped polymer films that facilitated FN adsorption through favorable interactions with accessible sulfate dopants. Importantly, these findings are correlated with previous studies showing increased stem cell migration and differentiation on 1:50 PEDOT:PDLLA surfaces compared with surfaces with 1:05 and 1:25 PEDOT:PDLLA ratios. (AU)

• Processo FAPESP: 14/09353-6 - Biomateriais baseados em polímeros condutores biodegradáveis e biocompatíveis
• Beneficiário: Aruã Clayton da Silva
• Linha de fomento: Bolsas no Brasil - Doutorado Direto
• Processo FAPESP: 12/50880-4 - Células-tronco: dos papéis de receptores de cininas e purinas às aplicações terapêuticas
• Beneficiário: Alexander Henning Ulrich
• Linha de fomento: Auxílio à Pesquisa - Temático
• Processo FAPESP: 15/26308-7 - Otimização das propriedades físico-químicas de materiais nano-estruturados e suas aplicações em reconhecimento molecular, catálise e conversão/armazenamento de energia
• Beneficiário: Roberto Manuel Torresi
• Linha de fomento: Auxílio à Pesquisa - Temático
• Processo FAPESP: 17/00705-5 - Estudo da interação entre diferentes proteínas com a superfície de PEDOT-co-PLLA por EC-AFM
• Beneficiário: Aruã Clayton da Silva
• Linha de fomento: Bolsas no Exterior - Estágio de Pesquisa - Doutorado Direto