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Tomazela L, Cruz MAE, Nascimento LA, Fagundes CC, da Veiga MAMS, Zamarioli A, Bottini M, Ciancaglini P, Brassesco MS, Engel EE, Ramos AP. Fabrication and characterization of a bioactive polymethylmethacrylate-based porous cement loaded with strontium/calcium apatite nanoparticles. J Biomed Mater Res A 2021; 110:812-826. [PMID: 34783455 DOI: 10.1002/jbm.a.37330] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2021] [Revised: 10/24/2021] [Accepted: 11/01/2021] [Indexed: 11/06/2022]
Abstract
Polymethylmethacrylate (PMMA)-based cements are used for bone reparation due to their biocompatibility, suitable mechanical properties, and mouldability. However, these materials suffer from high exothermic polymerization and poor bioactivity, which can cause the formation of fibrous tissue around the implant and aseptic loosening. Herein, we tackled these problems by adding Sr2+ -substituted hydroxyapatite nanoparticles (NPs) and a porogenic compound to the formulations, thus creating a microenvironment suitable for the proliferation of osteoblasts. The NPs resembled the structure of the bone's apatite and enabled the controlled release of Sr2+ . Trends in the X-ray patterns and infrared spectra confirmed that Sr2+ replaced Ca2+ in the whole composition range of the NPs. The inclusion of an effervescent additive reduced the polymerization temperature and lead to the formation of highly porous cement exhibiting mechanical properties comparable to the trabecular bone. The formation of an opened and interconnected matrix allowed osteoblasts to penetrate the cement structure. Most importantly, the gas formation confined the NPs at the surface of the pores, guaranteeing the controlled delivery of Sr2+ within a concentration sufficient to maintain osteoblast viability. Additionally, the cement was able to form apatite when immersed into simulated body fluids, further increasing its bioactivity. Therefore, we offer a formulation of PMMA cement with improved in vitro performance supported by enhanced bioactivity, increased osteoblast viability and deposition of mineralized matrix assigned to the loading with Sr2+ -substituted hydroxyapatite NPs and the creation of an interconnected porous structure. Altogether, our results hold promise for enhanced bone reparation guided by PMMA cements.
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Affiliation(s)
- Larissa Tomazela
- Departamento de Química, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Universidade de São Paulo, São Paulo, Brazil
| | - Marcos Antônio Eufrásio Cruz
- Departamento de Química, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Universidade de São Paulo, São Paulo, Brazil
| | - Larissa Aine Nascimento
- Departamento de Biologia, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Universidade de São Paulo, São Paulo, Brazil
| | - Cecilia C Fagundes
- Departamento de Biologia, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Universidade de São Paulo, São Paulo, Brazil
| | | | - Ariane Zamarioli
- Departamento de Ortopedia e Anestesiologia, Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, São Paulo, Brazil
| | - Massimo Bottini
- Department of Experimental Medicine, University of Rome Tor Vergata, Rome, Italy.,Sanford Children's Health Research Center, Sanford Burnham Prebys Medical Discovery Institute, La Jolla, California, USA
| | - Pietro Ciancaglini
- Departamento de Química, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Universidade de São Paulo, São Paulo, Brazil
| | - Maria Sol Brassesco
- Departamento de Biologia, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Universidade de São Paulo, São Paulo, Brazil
| | - Edgard E Engel
- Departamento de Ortopedia e Anestesiologia, Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, São Paulo, Brazil
| | - Ana Paula Ramos
- Departamento de Química, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Universidade de São Paulo, São Paulo, Brazil
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Emara A, Shah R. Recent update on craniofacial tissue engineering. J Tissue Eng 2021; 12:20417314211003735. [PMID: 33959245 PMCID: PMC8060749 DOI: 10.1177/20417314211003735] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2020] [Accepted: 02/26/2021] [Indexed: 12/13/2022] Open
Abstract
The craniofacial region consists of several different tissue types. These tissues are quite commonly affected by traumatic/pathologic tissue loss which has so far been traditionally treated by grafting procedures. With the complications and drawbacks of grafting procedures, the emerging field of regenerative medicine has proved potential. Tissue engineering advancements and the application in the craniofacial region is quickly gaining momentum although most research is still at early in vitro/in vivo stages. We aim to provide an overview on where research stands now in tissue engineering of craniofacial tissue; namely bone, cartilage muscle, skin, periodontal ligament, and mucosa. Abstracts and full-text English articles discussing techniques used for tissue engineering/regeneration of these tissue types were summarized in this article. The future perspectives and how current technological advancements and different material applications are enhancing tissue engineering procedures are also highlighted. Clinically, patients with craniofacial defects need hybrid reconstruction techniques to overcome the complexity of these defects. Cost-effectiveness and cost-efficiency are also required in such defects. The results of the studies covered in this review confirm the potential of craniofacial tissue engineering strategies as an alternative to avoid the problems of currently employed techniques. Furthermore, 3D printing advances may allow for fabrication of patient-specific tissue engineered constructs which should improve post-operative esthetic results of reconstruction. There are on the other hand still many challenges that clearly require further research in order to catch up with engineering of other parts of the human body.
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Affiliation(s)
- Aala’a Emara
- OMFS Department, Faculty of Dentistry,
Cairo University, Cairo, Egypt
- Division of Craniofacial and Surgical
Care, University of North Carolina (UNC) School of Dentistry, Chapel Hill, NC,
USA
| | - Rishma Shah
- Division of Craniofacial and Surgical
Care, University of North Carolina (UNC) School of Dentistry, Chapel Hill, NC,
USA
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Garner J, Hadar J, Skidmore S, Jessmon F, Immel R, Tyler A, Park K. Narrow molecular weight margins for the thermogelling property of polyester–polyether block copolymers in aqueous solutions. J Appl Polym Sci 2020. [DOI: 10.1002/app.48673] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Affiliation(s)
- John Garner
- Akina, Inc. 3495 Kent Avenue West Lafayette Indiana 47906
| | - Justin Hadar
- Akina, Inc. 3495 Kent Avenue West Lafayette Indiana 47906
| | - Sarah Skidmore
- Akina, Inc. 3495 Kent Avenue West Lafayette Indiana 47906
| | - Faye Jessmon
- Akina, Inc. 3495 Kent Avenue West Lafayette Indiana 47906
| | - Rebecca Immel
- Akina, Inc. 3495 Kent Avenue West Lafayette Indiana 47906
| | - Amie Tyler
- Akina, Inc. 3495 Kent Avenue West Lafayette Indiana 47906
| | - Kinam Park
- Akina, Inc. 3495 Kent Avenue West Lafayette Indiana 47906
- Department of Biomedical Engineering and PharmaceuticsPurdue University West Lafayette Indiana 47907
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Design of Novel Perovskite-Based Polymeric Poly(l-Lactide-Co-Glycolide) Nanofibers with Anti-Microbial Properties for Tissue Engineering. NANOMATERIALS 2020; 10:nano10061127. [PMID: 32517379 PMCID: PMC7353416 DOI: 10.3390/nano10061127] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/17/2020] [Revised: 06/04/2020] [Accepted: 06/05/2020] [Indexed: 01/19/2023]
Abstract
There is a growing need for anti-microbial materials in several biomedical application areas, such are hernia, skin grafts as well as gynecological products, owing to the complications caused by infection due to surgical biomaterials. The anti-microbial effects of silver in the form of nanoparticles, although effective, can be toxic to surrounding cells. In this study, we report, for the first time, a novel biomedical application of Ag0.3Na1.7La2Ti3O10-layered perovskite particles, blended with poly(L-lactide-co-glycolide) (PLGA), aimed at designing anti-microbial and tissue engineering scaffolds. The perovskite was incorporated in three concentrations of 1, 5, 10 and 15 w/w% and electrospun using dimethylformamide (DMF) and chloroform. The morphology of the resultant nanofibers revealed fiber diameters in the range of 408 to 610 nm by scanning electron microscopy. Mechanical properties of perovskite-based nanofibers also matched similar mechanical properties to human skin. We observed impressive anti-microbial activity, against Gram-negative, Gram-positive bacteria and even fungi, to Ag0.3Na1.7La2Ti3O10 in powder as well as nanofiber-incorporated forms. Furthermore, cytotoxicity assay and immunocytochemistry revealed that perovskite-based nanofibers promoted the proliferation of human dermal fibroblasts whist maintaining normal cellular protein expression. Our study shows that perovskite-nanofibers have potential as scaffolds for biomedical applications with anti-microbial needs.
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Su FY, Chen J, Son HN, Kelly AM, Convertine AJ, Ratner DM, Stayton PS. Polymer-augmented liposomes enhancing antibiotic delivery against intracellular infections. Biomater Sci 2018; 6:1976-1985. [PMID: 29850694 PMCID: PMC6195317 DOI: 10.1039/c8bm00282g] [Citation(s) in RCA: 44] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Pulmonary intracellular infections, such as tuberculosis, anthrax, and tularemia, have remained a significant challenge to conventional antibiotic therapy. Ineffective antibiotic treatment of these infections can lead not only to undesired side effects, but also to the emergence of antibiotic resistance. Aminoglycosides (e.g., streptomycin) have long been part of the therapeutic regiment for many pulmonary intracellular infections. Their bioavailability for intracellular bacterial pools, however, is limited by poor membrane permeability and rapid elimination. To address this challenge, polymer-augmented liposomes (PALs) were developed to provide improved cytosolic delivery of streptomycin to alveolar macrophages, an important host cell for intracellular pathogens. A multifunctional diblock copolymer was engineered to functionalize PALs with carbohydrate-mediated targeting, pH-responsive drug release, and endosomal release activity with a single functional polymer that replaces the pegylated lipid component to simplify the liposome formulation. The pH-sensing functionality enabled PALs to provide enhanced release of streptomycin under endosomal pH conditions (70% release in 6 hours) with limited release at physiological pH 7.4 (16%). The membrane-destabilizing activity connected to endosomal release was characterized in a hemolysis assay and PALs displayed a sharp pH profile across the endosomal pH development target range. The direct connection of this membrane-destabilizing pH profile to model drug release was demonstrated in an established pyranine/p-xylene bispyridinium dibromide (DPX) fluorescence dequenching assay. PALs displayed similar sharp pH-responsive release, whereas PEGylated control liposomes did not, and similar profiles were then shown for streptomycin release. The mannose-targeting capability of the PALs was also demonstrated with 2.5 times higher internalization compared to non-targeted PEGylated liposomes. Finally, the streptomycin-loaded PALs were shown to have a significantly improved intracellular antibacterial activity in a Francisella-macrophage co-culture model, compared with free streptomycin or streptomycin delivered by control PEGylated liposomes (13× and 16×, respectively). This study suggests the potential of PALs as a useful platform to deliver antibiotics for the treatment of intracellular macrophage infections.
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Affiliation(s)
- Fang-Yi Su
- Department of Bioengineering, University of Washington, Seattle, WA 98195, USA
| | - Jasmin Chen
- Department of Bioengineering, University of Washington, Seattle, WA 98195, USA
| | - Hye-Nam Son
- Department of Bioengineering, University of Washington, Seattle, WA 98195, USA
| | - Abby M. Kelly
- Department of Bioengineering, University of Washington, Seattle, WA 98195, USA
| | | | - Daniel M. Ratner
- Department of Bioengineering, University of Washington, Seattle, WA 98195, USA
| | - Patrick S. Stayton
- Department of Bioengineering, University of Washington, Seattle, WA 98195, USA
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Xue AS, Kania KE, Brown RH, Bullocks JM, Hollier LH, Izaddoost SA. Salvage of Infected Prosthetic Breast Reconstructions. Semin Plast Surg 2016; 30:55-9. [PMID: 27152096 DOI: 10.1055/s-0036-1580729] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Periprosthetic infection is a major complication in breast reconstruction, leading to implant loss and delayed and sometimes abandoned reconstruction. Traditional management of persistent infections requires explantation followed by secondary reconstruction after 6 months of delay. Although effective in treating the infection, this approach often leads to distortion and/or loss of tissue envelope, making secondary reconstruction very difficult. As a result, there is significant interest in salvaging infected prosthetic breast reconstructions. Recent studies reported variable success through systemic antibiotic therapy and surgical interventions. The aim of this article is to review the management of periprosthetic infection and to provide a potential salvage algorithm.
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Affiliation(s)
- Amy S Xue
- Division of Plastic and Reconstructive Surgery, Baylor College of Medicine, Houston, Texas
| | - Katarzyna E Kania
- Division of Plastic and Reconstructive Surgery, Baylor College of Medicine, Houston, Texas
| | - Rodger H Brown
- Division of Plastic and Reconstructive Surgery, Baylor College of Medicine, Houston, Texas
| | - Jamal M Bullocks
- Division of Plastic and Reconstructive Surgery, Baylor College of Medicine, Houston, Texas
| | - Larry H Hollier
- Division of Plastic and Reconstructive Surgery, Baylor College of Medicine, Houston, Texas
| | - Shayan A Izaddoost
- Division of Plastic and Reconstructive Surgery, Baylor College of Medicine, Houston, Texas
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