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1.
Int J Biol Macromol ; 185: 1022-1035, 2021 Aug 31.
Artigo em Inglês | MEDLINE | ID: mdl-34197859

RESUMO

Biochemical modification can endow the surface of implants with superior biological activity. Herein, silk fibroin (SF) protein and its anionic derivative peptides (Cs) were covalently immobilized onto a titanium implant surface via a polydopamine layer. The successful conjugation of SF and Cs was revealed by X-ray photoelectron spectroscopy (XPS), field-emission scanning electron microscopy (FE-SEM), atomic force microscopy (AFM), and contact angle measurements. The addition of Cs prevented the conformational transition of silk fibroin to silk II. The deposition of apatite on its surface was significantly accelerated, and the bioactive composite coating was observed to enhance protein adsorption and cell proliferation. More importantly, it also promoted the osteogenic differentiation of bone marrow stem cells (BMSCs) for the quantitative and qualitative detection of alkaline phosphatase (ALP) and alizarin red (ARS). Overall, the stable performance and enhanced osteogenic property of the composite coating promote an extensive application for clinical titanium-based implants.


Assuntos
Fibroínas/farmacologia , Indóis/química , Células-Tronco Mesenquimais/citologia , Osteogênese/efeitos dos fármacos , Polímeros/química , Titânio/química , Adsorção , Animais , Apatitas/química , Proliferação de Células/efeitos dos fármacos , Células Cultivadas , Fibroínas/química , Células-Tronco Mesenquimais/efeitos dos fármacos , Camundongos , Microscopia de Força Atômica , Oxirredução , Peptídeos/química , Peptídeos/farmacologia , Espectroscopia Fotoeletrônica
2.
Biomed Mater ; 16(4)2021 06 25.
Artigo em Inglês | MEDLINE | ID: mdl-34098538

RESUMO

In this study, the silk fibroin/nano-hydroxyapatite/hyaluronic acid (SF/nHAp/HA) composite scaffolds with different HA contents were developed by blending, cross-linking and freeze-drying, and their physicochemical properties and cell biocompatibilityin vitrowere subsequently studied. It was observed that the molecular conformation of the composite scaffolds was mainly composed of silk I and a small amount of theß-sheets structure. On enhancing the HA content, the pore size of the scaffold decreased, while the porosity, water absorption, swelling ratio and mechanical properties were observed to increase. In particular, the SF/nHAp/HA scaffold with a 5.0 wt% ratio exhibited the highest water absorption and mechanical properties among the developed materials. In addition, thein vitrocytocompatibility analysis showed that the bone marrow mesenchymal stem cells exhibited excellent cell proliferation and osteogenic differentiation ability on the SF/nHAp/5.0 wt%HA scaffolds, as compared with the other scaffolds. It can be concluded that the developed composite scaffolds represent a promising class of materials for the bone tissue repair and regeneration.

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