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Zhao X, You L, Wang T, Zhang X, Li Z, Ding L, Li J, Xiao C, Han F, Li B. Enhanced Osseointegration of Titanium Implants by Surface Modification with Silicon-doped Titania Nanotubes. Int J Nanomedicine 2020; 15:8583-8594. [PMID: 33173295 PMCID: PMC7648569 DOI: 10.2147/ijn.s270311] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2020] [Accepted: 09/15/2020] [Indexed: 12/18/2022] Open
Abstract
Introduction Despite great progress made in developing orthopedic implants, the development of titanium (Ti) implants with ideal early osseointegration remains a big challenge. Our pilot study has demonstrated that Si-TiO2 nanotubes on the surface of Ti substrates could enhance their osteogenic activity. Hence, in this study, we aim to comprehensively evaluate the effects of silicon-doped titania (Si-TiO2) nanotubes on the osseointegration property of Ti implants. Materials and Methods The Ti implants were surface modified with Si-TiO2 nanotubes through in situ anodization and Si plasma immersion ion implantation (PIII) method. Three groups were divided as Ti implants (Ti), Ti modified with TiO2 nanotubes (TiO2-NTs) and Ti modified with Si-TiO2 nanotubes (Si-TiO2-NTs). The morphology of Si-TiO2 nanotubes was observed by scanning electron microscope. The growth and osteogenic differentiation of MC3T3-E1 cells on the Ti implants were evaluated. Further, the pull-out tests and in vivo osseointegration ability evaluation were performed after implanting the screws in the femur of Sprague Dawley rats. Results The Si-TiO2 nanotubes could be seen on the surface of Ti implants. The MC3T3-E1 cells could grow on the surface of Ti, TiO2-NTs and Si-TiO2-NTs, and showed fast proliferation rate on the Si-TiO2-NTs. Moreover, the production of some osteogenesis-related proteins (ALP and Runx2) at one week and calcium deposition at four week was also enhanced in Si-TiO2-NTs rather than other groups. In vivo osseointegration results showed that Si-TiO2 nanotube-modified Ti screws had higher pullout force at two and four weeks as well as enhanced new bone formation at six weeks compared to bare Ti screws and Ti screws modified with TiO2 nanotubes alone. Discussion The modification of Si-TiO2-NTs on the Ti substrate could generate a nanostructured and hydrophilic surface, which can promote cell growth. Moreover, the existence of the TiO2 nanotubes and Si element also can improve the in vitro osteogenic differentiation of MC3T3-E1 cells and early bone formation around the implanted screws. Together, findings from this study show that surface modification of Ti implants with Si-TiO2 nanotubes could enhance early osseointegration and therefore has the potential for clinical applications.
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Affiliation(s)
- Xijiang Zhao
- Department of Orthopedics, The Affiliated Hospital of Jiangnan University, Wuxi, Jiangsu 214062, People's Republic of China
| | - Linna You
- Department of Orthopedics, The Affiliated Hospital of Jiangnan University, Wuxi, Jiangsu 214062, People's Republic of China
| | - Tao Wang
- Department of Orthopedics, The Affiliated Hospital of Jiangnan University, Wuxi, Jiangsu 214062, People's Republic of China
| | - Xianjun Zhang
- Department of Orthopedics, The Affiliated Hospital of Jiangnan University, Wuxi, Jiangsu 214062, People's Republic of China
| | - Zexi Li
- Departments of Orthopaedic Surgery and Stomatology, The First Affiliated Hospital, Orthopaedic Institute, Soochow University, Suzhou, Jiangsu 215006, People's Republic of China
| | - Luguang Ding
- Departments of Orthopaedic Surgery and Stomatology, The First Affiliated Hospital, Orthopaedic Institute, Soochow University, Suzhou, Jiangsu 215006, People's Republic of China
| | - Jiaying Li
- Departments of Orthopaedic Surgery and Stomatology, The First Affiliated Hospital, Orthopaedic Institute, Soochow University, Suzhou, Jiangsu 215006, People's Republic of China
| | - Can Xiao
- Departments of Orthopaedic Surgery and Stomatology, The First Affiliated Hospital, Orthopaedic Institute, Soochow University, Suzhou, Jiangsu 215006, People's Republic of China
| | - Fengxuan Han
- Departments of Orthopaedic Surgery and Stomatology, The First Affiliated Hospital, Orthopaedic Institute, Soochow University, Suzhou, Jiangsu 215006, People's Republic of China
| | - Bin Li
- Departments of Orthopaedic Surgery and Stomatology, The First Affiliated Hospital, Orthopaedic Institute, Soochow University, Suzhou, Jiangsu 215006, People's Republic of China
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Tavangar A, Premnath P, Tan B, Venkatakrishnan K. Noble Hybrid Nanostructures as Efficient Anti-Proliferative Platforms for Human Breast Cancer Cell. ACS APPLIED MATERIALS & INTERFACES 2016; 8:10253-10265. [PMID: 27035281 DOI: 10.1021/acsami.6b02720] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Nanomaterials have proven to possess great potential in biomaterials research. Recently, they have suggested considerable promise in cancer diagnosis and therapy. Among others, silicon (Si) nanomaterials have been extensively employed for various biomedical applications; however, the utilization of Si for cancer therapy has been limited to nanoparticles, and its potential as anticancer substrates has not been fully explored. Noble nanoparticles have also received considerable attention owing to unique anticancer properties to improve the efficiency of biomaterials for numerous biological applications. Nevertheless, immobilization and control over delivery of the nanoparticles have been challenge. Here, we develop hybrid nanoplatforms to efficiently hamper breast cancer cell adhesion and proliferation. Platforms are synthesized by femtosecond laser processing of Si into multiphase nanostructures, followed by sputter-coating with gold (Au)/gold-palladium (Au-Pd) nanoparticles. The performance of the developed platforms was then examined by exploring the response of normal fibroblast and metastatic breast cancer cells. Our results from the quantitative and qualitative analyses show a dramatic decrease in the number of breast cancer cells on the hybrid platform compared to untreated substrates. Whereas, fibroblast cells form stable adhesion with stretched and elongated cytoskeleton and actin filaments. The hybrid platforms perform as dual-acting cytophobic/cytostatic stages where Si nanostructures depress breast cancer cell adhesion while immobilized Au/Au-Pd nanoparticles are gradually released to affect any surviving cell on the nanostructures. The nanoparticles are believed to be taken up by breast cancer cells via endocytosis, which subsequently alter the cell nucleus and may cause cell death. The findings suggest that the density of nanostructures and concentration of coated nanoparticles play critical roles on cytophobic/cytostatic properties of the platforms on human breast cancer cells while having no or even cytophilic effects on fibroblast cells. Because of the remarkable contrary responses of normal and cancer cells to the proposed platform, we envision that it will provide novel applications in cancer research.
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Affiliation(s)
- Amirhossein Tavangar
- Micro/Nanofabrication Laboratory, Department of Mechanical and Industrial Engineering, Ryerson University , 350 Victoria Street, Toronto, Ontario M5B 2K3, Canada
| | - Priyatha Premnath
- Micro/Nanofabrication Laboratory, Department of Mechanical and Industrial Engineering, Ryerson University , 350 Victoria Street, Toronto, Ontario M5B 2K3, Canada
| | - Bo Tan
- Nanocharacterization Laboratory, Department of Aerospace Engineering, Ryerson University , 350 Victoria Street, Toronto, Ontario M5B 2K3, Canada
| | - Krishnan Venkatakrishnan
- Micro/Nanofabrication Laboratory, Department of Mechanical and Industrial Engineering, Ryerson University , 350 Victoria Street, Toronto, Ontario M5B 2K3, Canada
- Affiliate Scientist, Keenan Research Centre for Biomedical Science, St. Michael's Hospital, Toronto, Ontario M5B 1W8, Canada
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Premnath P, Tavangar A, Tan B, Venkatakrishnan K. Tuning cell adhesion by direct nanostructuring silicon into cell repulsive/adhesive patterns. Exp Cell Res 2015; 337:44-52. [PMID: 26232686 DOI: 10.1016/j.yexcr.2015.07.028] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2015] [Revised: 07/16/2015] [Accepted: 07/26/2015] [Indexed: 01/06/2023]
Abstract
Developing platforms that allow tuning cell functionality through incorporating physical, chemical, or mechanical cues onto the material surfaces is one of the key challenges in research in the field of biomaterials. In this respect, various approaches have been proposed and numerous structures have been developed on a variety of materials. Most of these approaches, however, demand a multistep process or post-chemical treatment. Therefore, a simple approach would be desirable to develop bio-functionalized platforms for effectively modulating cell adhesion and consequently programming cell functionality without requiring any chemical or biological surface treatment. This study introduces a versatile yet simple laser approach to structure silicon (Si) chips into cytophobic/cytophilic patterns in order to modulate cell adhesion and proliferation. These patterns are fabricated on platforms through direct laser processing of Si substrates, which renders a desired computer-generated configuration into patterns. We investigate the morphology, chemistry, and wettability of the platform surfaces. Subsequently, we study the functionality of the fabricated platforms on modulating cervical cancer cells (HeLa) behaviour. The results from in vitro studies suggest that the nanostructures efficiently repel HeLa cells and drive them to migrate onto untreated sites. The study of the morphology of the cells reveals that cells evade the cytophobic area by bending and changing direction. Additionally, cell patterning, cell directionality, cell channelling, and cell trapping are achieved by developing different platforms with specific patterns. The flexibility and controllability of this approach to effectively structure Si substrates to cell-repulsive and cell-adhesive patterns offer perceptible outlook for developing bio-functionalized platforms for a variety of biomedical devices. Moreover, this approach could pave the way for developing anti-cancer platforms that selectively repel cancer cells while favoring the adhesion of normal cells.
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Affiliation(s)
- Priyatha Premnath
- Micro/Nanofabrication Laboratory, Department of Mechanical and Industrial Engineering, Ryerson University, 350 Victoria Street, Toronto, ON, Canada M5B 2K3.
| | - Amirhossein Tavangar
- Micro/Nanofabrication Laboratory, Department of Mechanical and Industrial Engineering, Ryerson University, 350 Victoria Street, Toronto, ON, Canada M5B 2K3.
| | - Bo Tan
- Nanocharacterization Laboratory, Department of Aerospace Engineering, Ryerson University, 350 Victoria Street, Toronto, ON, Canada M5B 2K3.
| | - Krishnan Venkatakrishnan
- Micro/Nanofabrication Laboratory, Department of Mechanical and Industrial Engineering, Ryerson University, 350 Victoria Street, Toronto, ON, Canada M5B 2K3.
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