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Cheng X, Long D, Chen L, Jansen JA, Leeuwenburgh SC, Yang F. Electrophoretic deposition of silk fibroin coatings with pre-defined architecture to facilitate precise control over drug delivery. Bioact Mater 2021; 6:4243-4254. [PMID: 33997504 PMCID: PMC8102429 DOI: 10.1016/j.bioactmat.2021.03.046] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2020] [Revised: 03/09/2021] [Accepted: 03/29/2021] [Indexed: 12/29/2022] Open
Abstract
The therapeutic precision and clinical applicability of drug-eluting coatings can be substantially improved by facilitating tunable drug delivery. However, the design of coatings which allows for precise control over drug release kinetics is still a major challenge. Here, a double-layered silk fibroin (SF) coating system was constructed by sequential electrophoretic deposition. A mixture of dissolved Bombyx mori SF (bmSF) molecules and pre-made bmSF nanospheres at different ratios was deposited as under-layer. Subsequently, this underlayer was covered by a top-layer comprising Antheraea pernyi SF (apSF) molecules (rich in arginylglycylaspartic acid, RGD) to improve the cellular response of the resulting double-layered coatings. Additionally, model drug doxycycline was either pre-mixed with dissolved bmSF molecules or pre-loaded into pre-made bmSF nanospheres at the same amount before their mixing and deposition. The thickness and nanosphere content of the under-layer architecture were proportional to the deposition time and nanosphere concentration in precursor mixtures, respectively. The surface topography, wettability, degradation rate and adhesion strength were comparable within the double-layered coating system. As expected, RGD-rich apSF top-layer improved cell adhesion, spreading and proliferation compared with bmSF top-layer. Furthermore, the amount and duration of drug release increased linearly with increasing nanosphere concentration at fixed deposition time, whereas drug release amount increased linearly with increasing deposition time. These results indicate that the dosage and kinetics of loaded drugs can be quantitatively tailored by altering nanosphere concentration and deposition time as main processing parameters. Overall, this study illustrates the strong potential of pre-defining coating architecture to facilitate control over drug delivery.
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Affiliation(s)
- Xian Cheng
- Department of Dentistry-Biomaterials, Radboud Institute for Molecular Life Sciences, Radboud University Medical Center, Philips van Leydenlaan 25, 6525, EX Nijmegen, the Netherlands
- Jiangsu Key Laboratory of Oral Diseases, Nanjing Medical University, Nanjing, 210029, PR China
| | - Dingpei Long
- Institute for Biomedical Sciences, Center for Diagnostics & Therapeutics, Georgia State University, Atlanta, GA, 30302, USA
| | - Lili Chen
- Department of Stomatology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430022, PR China
| | - John A. Jansen
- Department of Dentistry-Biomaterials, Radboud Institute for Molecular Life Sciences, Radboud University Medical Center, Philips van Leydenlaan 25, 6525, EX Nijmegen, the Netherlands
| | - Sander C.G. Leeuwenburgh
- Department of Dentistry-Biomaterials, Radboud Institute for Molecular Life Sciences, Radboud University Medical Center, Philips van Leydenlaan 25, 6525, EX Nijmegen, the Netherlands
| | - Fang Yang
- Department of Dentistry-Biomaterials, Radboud Institute for Molecular Life Sciences, Radboud University Medical Center, Philips van Leydenlaan 25, 6525, EX Nijmegen, the Netherlands
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