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Acosta-Ramirez I, Conover C, Larsen J, Plange PNA, Kilic U, Muller B, Iverson NM. Development of sterile platform for quantification of extracellular analytes via single walled carbon nanotubes. Anal Biochem 2024; 693:115582. [PMID: 38825160 PMCID: PMC11251094 DOI: 10.1016/j.ab.2024.115582] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2024] [Revised: 05/23/2024] [Accepted: 05/30/2024] [Indexed: 06/04/2024]
Abstract
Progress has been made studying cell-cell signaling communication processes. However, due to limitations of current sensors on time and spatial resolution, the role of many extracellular analytes is still unknown. A single walled carbon nanotube (SWNT) platform was previously developed based on the avidin-biotin immobilization of SWNT to a glass substrate. The SWNT platform provides real time feedback about analyte concentration and has a high concentration of evenly distributed sensors, both of which are essential for the study of extracellular analytes. Unfortunately, this initial SWNT platform is synthesized through unsterile conditions and cannot be sterilized post-production due to the delicate nature of the sensors, making it unsuitable for in vitro work. Herein the multiple-step process for SWNT immobilization is modified and the platform's biocompatibility is assessed in terms of sterility, cytotoxicity, cell proliferation, and cell morphology through comparison with non-sensors controls. The results demonstrate the SWNT platform's sterility and lack of toxicity over 72 h. The proliferation rate and morphology profiles for cells growing on the SWNT platform are similar to those grown on tissue culture substrates. This novel nano-sensor platform preserves cell health and cell functionality over time, offering opportunities to study extracellular analytes gradients in cellular communication.
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Affiliation(s)
- Ivon Acosta-Ramirez
- Department of Biological Systems Engineering, College of Agricultural Sciences and Natural Resources, University of Nebraska-Lincoln, 4240 Fair St, Lincoln NE, 68504, United States.
| | - Carley Conover
- Department of Biological Systems Engineering, College of Agricultural Sciences and Natural Resources, University of Nebraska-Lincoln, 4240 Fair St, Lincoln NE, 68504, United States.
| | - Jacob Larsen
- Department of Chemistry, College of Arts and Sciences, University of Nebraska-Lincoln, 639 N 12th Street, Lincoln NE, 68508, United States.
| | - Portia N A Plange
- Department of Biological Systems Engineering, College of Agricultural Sciences and Natural Resources, University of Nebraska-Lincoln, 4240 Fair St, Lincoln NE, 68504, United States.
| | - Ufuk Kilic
- Department of Electrical and Computer Engineering, University of Nebraska-Lincoln, 900 N 16th St, Lincoln NE, 68508, United States.
| | - Becca Muller
- Department of Biological Systems Engineering, College of Agricultural Sciences and Natural Resources, University of Nebraska-Lincoln, 4240 Fair St, Lincoln NE, 68504, United States
| | - Nicole M Iverson
- Department of Biological Systems Engineering, College of Agricultural Sciences and Natural Resources, University of Nebraska-Lincoln, 4240 Fair St, Lincoln NE, 68504, United States.
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Susanto A, Komara I, Beatrix MT, Lukitowati F, Amaliya A, Hendiani I, Miranda A. Determination of the Sterilization Dose of Gamma-Ray Irradiation for Polyvinyl Alcohol-Collagen-Chitosan Composite Membrane as a Material for Periodontal Regenerative Surgery. Eur J Dent 2023; 17:1289-1293. [PMID: 37369235 PMCID: PMC10756808 DOI: 10.1055/s-0043-1761186] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/29/2023] Open
Abstract
OBJECTIVE Membrane sterility is very necessary considering its function as an implant material. Therefore, this research aims to determine the dose of gamma-ray irradiation for the sterilization of polyvinyl alcohol (PVA)-collagen-chitosan composite membranes used as regenerative surgery materials. MATERIALS AND METHODS A total of 100 pieces of the composite membranes were prepared in a size of 2.0 × 1.5 cm by mixing 7.5% PVA, 3% collagen, and 2% chitosan using the film casting method in three batches. Furthermore, the bioburden test was performed to determine the initial microbial count in the sample by following ISO 11737-1. The results were used to ascertain the dose of gamma-ray irradiation on the sample according to ISO 11137-2. The dose verification test was then performed at the sterility assurance level 10-6. RESULTS The average result of the bioburden test from three batches was 6.6 colony forming unit; hence, the verification dose was 4.8 kGy. In the verification dose test, since there was only one contaminated sample, the sterility dose test was continued. CONCLUSION The sterile gamma-ray irradiation dose for PVA-collagen-chitosan composite membrane was 17.1 kGy.
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Affiliation(s)
- Agus Susanto
- Department of Periodontics, Faculty of Dentistry, Universitas Padjadjaran, Bandung, Indonesia
| | - Ira Komara
- Department of Periodontics, Faculty of Dentistry, Universitas Padjadjaran, Bandung, Indonesia
| | - Maria Theresia Beatrix
- Department of Periodontics, Faculty of Dentistry, Universitas Padjadjaran, Bandung, Indonesia
| | - Fajar Lukitowati
- Research Center for Radiation Process Technology—National Research and Innovation Agency (NRIA), Indonesia
| | - Amaliya Amaliya
- Department of Periodontics, Faculty of Dentistry, Universitas Padjadjaran, Bandung, Indonesia
| | - Ina Hendiani
- Department of Periodontics, Faculty of Dentistry, Universitas Padjadjaran, Bandung, Indonesia
| | - Aldilla Miranda
- Department of Periodontics, Faculty of Dentistry, Universitas Padjadjaran, Bandung, Indonesia
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Yazigi C, Chaar MS, Busch R, Kern M. The Effect of Sterilization on the Accuracy and Fit of 3D-Printed Surgical Guides. MATERIALS (BASEL, SWITZERLAND) 2023; 16:5305. [PMID: 37570008 PMCID: PMC10419648 DOI: 10.3390/ma16155305] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/13/2023] [Revised: 07/23/2023] [Accepted: 07/26/2023] [Indexed: 08/13/2023]
Abstract
This study was conducted to evaluate the accuracy of 3D-printed surgical guides before and after sterilization in a steam sterilizer. A test-model incorporating three implant replicas was customized. A total of forty guides were printed from five printable resins. A group made from a self-curing composite served as control group. The guides were checked for fit. Vertical discrepancies between the model and guides were measured at standardized points at a load of 500 g (P1). The guides were connected to implant replicas and scanned, and their angles were digitally measured. The specimens were sterilized in a steam sterilizer at 121 °C for 20 min at 2 bar pressure. Vertical discrepancies (P2) and angulations were remeasured. Additionally, the specimens were repositioned with an increased load, and measurements were repeated (P3). All specimens were repositionable after sterilization. The smallest variation in discrepancy at a 500 g load was 428 µm, whereas the greatest was 1487 µm. Under an increased force, the smallest change was 94 µm, while the greatest was 260 µm. The level of significance α = 0.05 (95% confidence interval) was set for all tests. The variation in the measured angles was not statistically significant (Kruskal-Wallis's test, p > 0.05). The accuracy was affected by the material and sterilization, but it was clinically acceptable when an increased load was applied during repositioning.
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Affiliation(s)
- Christine Yazigi
- Department of Prosthodontics, Propaedeutics and Dental Materials, School of Dentistry, Christian-Albrechts University, 24105 Kiel, Germany; (M.S.C.); (R.B.); (M.K.)
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Gareb B, van Bakelen NB, Driessen L, Buma P, Kuipers J, Grijpma DW, Vissink A, Bos RR, van Minnen B. Biocompatibility and degradation comparisons of four biodegradable copolymeric osteosynthesis systems used in maxillofacial surgery: A goat model with four years follow-up. Bioact Mater 2022; 17:439-456. [PMID: 35386449 PMCID: PMC8961280 DOI: 10.1016/j.bioactmat.2022.01.015] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2021] [Revised: 12/10/2021] [Accepted: 01/08/2022] [Indexed: 01/15/2023] Open
Abstract
Applying biodegradable osteosyntheses avoids the disadvantages of titanium osteosyntheses. However, foreign-body reactions remain a major concern and evidence of complete resorption is lacking. This study compared the physico-chemical properties, histological response and radiographs of four copolymeric biodegradable osteosynthesis systems in a goat model with 48-months follow-up. The systems were implanted subperiosteally in both tibia and radius of 12 Dutch White goats. The BioSorb FX [poly(70LLA-co-30DLLA)], Inion CPS [poly([70–78.5]LLA-co-[16–24]DLLA-co-4TMC)], SonicWeld Rx [poly(DLLA)], LactoSorb [poly(82LLA-co-18GA)] systems and a negative control were randomly implanted in each extremity. Samples were assessed at 6-, 12-, 18-, 24-, 36-, and 48-month follow-up. Surface topography was performed using scanning electron microscopy (SEM). Differential scanning calorimetry and gel permeation chromatography were performed on initial and explanted samples. Histological sections were systematically assessed by two blinded researchers using (polarized) light microscopy, SEM and energy-dispersive X-ray analysis. The SonicWeld Rx system was amorphous while the others were semi-crystalline. Foreign-body reactions were not observed during the complete follow-up. The SonicWeld Rx and LactoSorb systems reached bone percentages of negative controls after 18 months while the BioSorb Fx and Inion CPS systems reached these levels after 36 months. The SonicWeld Rx system showed the most predictable degradation profile. All the biodegradable systems were safe to use and well-tolerated (i.e., complete implant replacement by bone, no clinical or histological foreign body reactions, no [sterile] abscess formation, no re-interventions needed), but nanoscale residual polymeric fragments were observed at every system's assessment. Foreign-body reactions are a major concern of biodegradable osteosyntheses. Amorphous poly(DLLA) showed the most predictable degradation profile. Nanoscale residual polymeric fragments could still be observed after 4 years.
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Effects of Sterilization and Hydrolytic Degradation on the Structure, Morphology and Compressive Strength of Polylactide-Hydroxyapatite Composites. Int J Mol Sci 2022; 23:ijms231810454. [PMID: 36142380 PMCID: PMC9499569 DOI: 10.3390/ijms231810454] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2022] [Revised: 09/01/2022] [Accepted: 09/05/2022] [Indexed: 11/17/2022] Open
Abstract
Composites based on polylactide (PLA) and hydroxyapatite (HA) were prepared using a thermally induced phase separation method. In the experimental design, the PLA with low weight-average molar mass (Mw) and high Mw were tested with the inclusion of HA synthesized as whiskers or hexagonal rods. In addition, the structure of HA whiskers was doped with Zn, whereas hexagonal rods were mixed with Sr salt. The composites were sterilized and then incubated in phosphate-buffered saline for 12 weeks at 37 °C, followed by characterization of pore size distribution, molecular properties, density and mechanical strength. Results showed a substantial reduction of PLA Mw for both polymers due to the preparation of composites, their sterilization and incubation. The distribution of pore size effectively increased after the degradation process, whereas the sterilization, furthermore, had an impact on pore size distribution depending on HA added. The inclusion of HA reduced to some extent the degradation of PLA quantitatively in the weight loss in vitro compared to the control without HA. All produced materials showed no cytotoxicity when validated against L929 mouse skin fibroblasts and hFOB 1.19 human osteoblasts. The lack of cytotoxicity was accompanied by the immunocompatibility with human monocytic cells that were able to detect pyrogenic contaminants.
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López-Valverde N, López-Valverde A, Cortés MP, Rodríguez C, Macedo De Sousa B, Aragoneses JM. Bone Quantification Around Chitosan-Coated Titanium Dental Implants: A Preliminary Study by Micro-CT Analysis in Jaw of a Canine Model. Front Bioeng Biotechnol 2022; 10:858786. [PMID: 35464727 PMCID: PMC9023049 DOI: 10.3389/fbioe.2022.858786] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2022] [Accepted: 03/17/2022] [Indexed: 12/11/2022] Open
Abstract
Surface treatments of Ti in the dental implant industry are performed with the aim of in-creasing its bioactivity and osseointegration capacity. Chitosan (Cht) is a polysaccharide that has been proposed as a promising biomaterial in tissue engineering and bone regeneration, due to its ability to stimulate the recruitment and adhesion of osteogenic progenitor cells. The aim of our preliminary study was to evaluate, by micro-computed tomography (micro-CT), the osseointegration and bone formation around Cht-coated implants and to compare them with conventional surface-etched implants (SLA type). Four im-plants (8.5 mm length × 3.5 mm Ø) per hemiarch, were inserted into the jaws of five dogs, divided into two groups: chitosan-coated implant group (ChtG) and control group (CG). Twelve weeks after surgery, euthanasia was performed, and sectioned bone blocks were obtained and scanned by micro-CT and two bone parameters were measured: bone in contact with the implant surface (BCIS) and peri-implant bone area (PIBA). For BCIS and PIBA statistically significant values were obtained for the ChtG group with respect to CG (p = 0.005; p = 0.014 and p < 0.001 and p = 0.002, respectively). The results, despite the limitations, demonstrated the usefulness of chitosan coatings. However, studies with larger sample sizes and adequate experimental models would be necessary to confirm the results.
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Affiliation(s)
- Nansi López-Valverde
- Department of Medicine and Medical Specialties, Faculty of Health Sciences, Universidad Alcalá de Henares, Alcalá de Henares, Spain
| | - Antonio López-Valverde
- Department of Surgery, University of Salamanca, Instituto de Investigación Biomédica de Sala-manca (IBSAL), Salamanca, Spain
- *Correspondence: Antonio López-Valverde,
| | - Marta Paz Cortés
- Faculty of Dentistry, Universidad Alfonso X El Sabio, Villanueva de la Cañada, Spain
| | - Cinthia Rodríguez
- Department of Dentistry, Universidad Federico Henríquez y Carvajal, Santo Domingo, Dominican Republic
| | - Bruno Macedo De Sousa
- Institute for Occlusion and Orofacial Pain Faculty of Medicine, University of Coimbra, Polo I‐Edifício Central Rua Larga, Coimbra, Portugal
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Wu J, Tang Y, Pu X, Wang M, Chen F, Chen X, Zhu X, Zhang X. The role of micro-vibration parameters in inflammatory responses of macrophages cultured on biphasic calcium phosphate ceramics and the resultant influence on osteogenic differentiation of mesenchymal stem cells. J Mater Chem B 2021; 9:8003-8013. [PMID: 34476430 DOI: 10.1039/d1tb00898f] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Although in vitro studies have shown that biomaterials and mechanical stimuli can mediate inflammatory responses or regulate osteogenesis of MSCs, the underlying behaviour of the inflammatory response of macrophages on biomaterials mediated by mechanical stimuli, which regulates osteogenesis, is relatively unknown. Thus, it is imperative to explore the role of bionic mechanical stimulation in the biomaterial-mediated inflammatory response of macrophages. In this study, we used osteoinductive biphasic calcium phosphate (BCP) ceramics as the model biomaterial and chose micro-vibration stimulation (MVs) with three variable parameters (frequency, magnitude, and time). Based on orthogonal experiments, nine combinations of MVs parameters were generated, and their effects on the BCP-mediated macrophage inflammatory response were investigated. MVs significantly affected the gene expression and cytokine secretion of macrophages grown on BCP ceramics and further influenced the behaviour of bone marrow mesenchymal stem cells (BMMSCs) in a paracrine manner. Moreover, frequency seemed to be the most dominant factor (compared with magnitude and time) in regulating the inflammatory response of macrophages. The optimal combination of MVs parameters (frequency 10 Hz, magnitude 0.45 g, and time 60 min) could induce a healing-associated M2 phenotype, as evidenced by the downregulated pro-inflammatory gene (Il-1β, and Tnf-α) expression, the upregulated anti-inflammatory gene (Il10) expression, and the inhibited pro-inflammatory cytokine (Il-1β and Tnf-α) secretion of macrophages grown on BCP ceramics, and its conditioned medium (CM) could further promote osteogenic differentiation of BMMSCs. These findings provide valuable insights into the mechanical stimulus-mediated macrophage inflammatory response and osteogenesis in the presence of osteoinductive BCP ceramics and allow accurate evaluation of the biological performance of biomaterials in vitro, in order to optimize bone substitute materials to achieve the desired clinical performance.
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Affiliation(s)
- Jinjie Wu
- National Engineering Research Center for Biomaterials, Sichuan University, Chengdu 610064, China.
| | - Yitao Tang
- National Engineering Research Center for Biomaterials, Sichuan University, Chengdu 610064, China.
| | - Ximing Pu
- College of Materials and Engineering, Sichuan University, Chengdu 610064, China
| | - Menglu Wang
- National Engineering Research Center for Biomaterials, Sichuan University, Chengdu 610064, China.
| | - Fuying Chen
- National Engineering Research Center for Biomaterials, Sichuan University, Chengdu 610064, China.
| | - Xuening Chen
- National Engineering Research Center for Biomaterials, Sichuan University, Chengdu 610064, China.
| | - Xiangdong Zhu
- National Engineering Research Center for Biomaterials, Sichuan University, Chengdu 610064, China.
| | - Xingdong Zhang
- National Engineering Research Center for Biomaterials, Sichuan University, Chengdu 610064, China.
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Effects of γ-radiation on structure and properties of poly(lactic acid) filaments. Radiat Phys Chem Oxf Engl 1993 2021. [DOI: 10.1016/j.radphyschem.2021.109456] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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How to Sterilize Polylactic Acid Based Medical Devices? Polymers (Basel) 2021; 13:polym13132115. [PMID: 34203204 PMCID: PMC8271615 DOI: 10.3390/polym13132115] [Citation(s) in RCA: 32] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2021] [Revised: 06/18/2021] [Accepted: 06/23/2021] [Indexed: 12/24/2022] Open
Abstract
How sterilization techniques accurately affect the properties of biopolymers continues to be an issue of discussion in the field of biomedical engineering, particularly now with the development of 3D-printed devices. One of the most widely used biopolymers in the manufacture of biomedical devices is the polylactic acid (PLA). Despite the large number of studies found in the literature on PLA devices, relatively few papers focus on the effects of sterilization treatments on its properties. It is well documented in the literature that conventional sterilization techniques, such as heat, gamma irradiation and ethylene oxide, can induced damages, alterations or toxic products release, due to the thermal and hydrolytical sensitivity of PLA. The purposes of this paper are, therefore, to review the published data on the most common techniques used to sterilize PLA medical devices and to analyse how they are affecting their physicochemical and biocompatible properties. Emerging and alternative sterilization methods for sensitive biomaterials are also presented.
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Effects of Gamma Radiation-Induced Crosslinking of Collagen Type I Coated Dental Titanium Implants on Osseointegration and Bone Regeneration. MATERIALS 2021; 14:ma14123268. [PMID: 34199187 PMCID: PMC8231814 DOI: 10.3390/ma14123268] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/28/2021] [Revised: 06/10/2021] [Accepted: 06/10/2021] [Indexed: 01/05/2023]
Abstract
This study aimed to compare two methods of crosslinking collagen type I on implanted titanium surfaces, that is, using glutaraldehyde (GA) or gamma-rays (GRs), in a beagle dog model. For in vivo experiments, implants were allocated to three groups and applied to mandibular bone defects in beagle dogs; Group SLA; non-treated Sandblasted, large grit, acid-etched (SLA) implants, Group GA; SLA implants coated with GA crosslinked collagen type I, Group GR; SLA surface implants coated with collagen type I and crosslinked using 25 kGy of 60Co gamma radiation. New bone μCT volumes were obtained, and histologic and histometric analyses were performed in regions of interest. The GR group had significantly better new bone areas (NBAs) and bone to implant contact (BIC) results than the SLA group (p < 0.05), but the GA and GR groups were similar in this respect. New bone volumes and inter-thread bone densities (ITBD) were non-significantly different in the three groups (p > 0.05). Within the limits of this study, gamma-ray collagen crosslinking on titanium implants can be considered a substitute for glutaraldehyde crosslinking.
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Effects of gamma irradiation on properties of PLA/flax composites. IRANIAN POLYMER JOURNAL 2020. [DOI: 10.1007/s13726-020-00820-w] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Chen X, Wang M, Chen F, Wang J, Li X, Liang J, Fan Y, Xiao Y, Zhang X. Correlations between macrophage polarization and osteoinduction of porous calcium phosphate ceramics. Acta Biomater 2020; 103:318-332. [PMID: 31857257 DOI: 10.1016/j.actbio.2019.12.019] [Citation(s) in RCA: 67] [Impact Index Per Article: 16.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2019] [Revised: 12/09/2019] [Accepted: 12/13/2019] [Indexed: 01/08/2023]
Abstract
The host immune response is critical for in situ osteogenesis, but correlations between local inflammatory reactions and biomaterial osteoinduction are still poorly understood. This study used a murine intramuscular implantation model to demonstrate that calcium phosphate ceramics with different phase compositions exhibited divergent osteoinductivities. The osteoinductive potential of each ceramic was closely associated with the immunomodulatory capacity of the material, and especially with the regulation of macrophage polarization and functional status. Biphasic calcium phosphate (BCP) ceramics with superior osteoinductive potential enhanced the fraction of CD206+ M2 macrophages, up-regulated expression of M2 phenotypic markers in vitro, and increased the ARG+ M2 population in vivo. This suggested that BCP ceramics could ameliorate long-term inflammation and build a pro-osteogenic microenvironment. However, β-tricalcium phosphate (β-TCP) ceramics with no obvious osteoinductivity increased the fraction of CCR7+ M1 macrophages, promoted the secretion of M1 phenotypic markers in vitro, and maintained a high proportion of iNOS+ M1 macrophages in vivo. It indicated that β-TCP ceramics could exacerbate inflammation and inhibit ectopic bone formation. Hydroxyapatite ceramics with an intermediate osteoinductivity exhibited a moderate amount of both M1 and M2 macrophages. These findings highlight the critical role of macrophage polarization in biomaterial-dependent osteoinduction, which not only deepens our understanding of osteoinductive mechanisms but also provides a strategy to design bone substitutes by endowing materials with the proper immunomodulatory abilities to achieve the desired clinic performance. STATEMENT OF SIGNIFICANCE: Calcium phosphate (CaP) ceramics with osteoinductive capacities are able to induce ectopic bone formation in non-osseous sites. However, its underlying mechanism is largely unknown. Previous studies have demonstrated an indispensable role of macrophages in osteogenesis, inspiring us that local inflammatory reaction may affect material-dependent osteoinduction. This study indicated that CaP ceramics with different phase composition could present divergent osteoinductive capacities through modulating polarization and functional status of macrophages, as biphasic calcium phosphate with potent osteoinductivity ameliorated long-term inflammation and induced a healing-associated M2 phenotype to initiate bone formation. These findings not only get an insight into the mechanism of CaP-involved osteoinduction, but also help the design of tissue-inducing implants by endowing biomaterials with proper immunomodulatory ability.
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Affiliation(s)
- Xuening Chen
- National Engineering Research Center for Biomaterials, Sichuan University, Chengdu, China
| | - Menglu Wang
- National Engineering Research Center for Biomaterials, Sichuan University, Chengdu, China
| | - Fuying Chen
- National Engineering Research Center for Biomaterials, Sichuan University, Chengdu, China
| | - Jing Wang
- National Engineering Research Center for Biomaterials, Sichuan University, Chengdu, China
| | - Xiangfeng Li
- National Engineering Research Center for Biomaterials, Sichuan University, Chengdu, China
| | - Jie Liang
- National Engineering Research Center for Biomaterials, Sichuan University, Chengdu, China.
| | - Yujiang Fan
- National Engineering Research Center for Biomaterials, Sichuan University, Chengdu, China
| | - Yumei Xiao
- National Engineering Research Center for Biomaterials, Sichuan University, Chengdu, China.
| | - Xingdong Zhang
- National Engineering Research Center for Biomaterials, Sichuan University, Chengdu, China
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Groza A, Iconaru SL, Jiga G, Chapon P, Gaiaschi S, Verga N, Beuran M, Prodan AM, Matei M, Marinescu SA, Trusca R, Predoi D. The Effect of the Ionizing Radiation on Hydroxyapatite–Polydimethylsiloxane Layers. POLYM ENG SCI 2019. [DOI: 10.1002/pen.25247] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- Andreea Groza
- National Institute for LaserPlasma and Radiation Physics, 409 Atomistilor St., P.O. Box MG36 077125 Magurele Romania
| | | | - Gabriel Jiga
- Faculty of Engineering and Management of Technological Systems, Department of Strengh of MaterialsUniversity Politehnica of Bucharest Bucharest Romania
| | - Patrick Chapon
- Horiba Jobin Yvon SAS, 16‐18 Rue du Canal 91165 Longjumeau Cedex France
| | - Sofia Gaiaschi
- Horiba Jobin Yvon SAS, 16‐18 Rue du Canal 91165 Longjumeau Cedex France
| | - Nicolae Verga
- Carol Davila University of Medicine and Pharmacy, 8 Eroii Sanitari, Sector 5 Bucharest 050474 Romania
- Coltea Clinical HospitalRadiotherapy Department, Ion C. Brătianu 1 Street Bucharest Romania
| | - Mircea Beuran
- Carol Davila University of Medicine and Pharmacy, 8 Eroii Sanitari, Sector 5 Bucharest 050474 Romania
- Emergency Hospital Floreasca Bucharest, 8 Calea Floresca 014461 Bucharest Romania
| | - Alina Mihaela Prodan
- Carol Davila University of Medicine and Pharmacy, 8 Eroii Sanitari, Sector 5 Bucharest 050474 Romania
- Emergency Hospital Floreasca Bucharest, 8 Calea Floresca 014461 Bucharest Romania
| | - Mihai Matei
- Carol Davila University of Medicine and Pharmacy, 8 Eroii Sanitari, Sector 5 Bucharest 050474 Romania
- Emergency Hospital Floreasca Bucharest, 8 Calea Floresca 014461 Bucharest Romania
| | - Serban Andrei Marinescu
- Oncology Institute Professor Doctor Alexandru Trestioreanu, 252 Fundeni 022328 Bucharest Romania
| | - Roxana Trusca
- Faculty of Applied Chemistry and Materials SciencePolitehnica University of Bucharest 060042 Bucharest Romania
| | - Daniela Predoi
- National Institute of Materials Physics, 405 A Atomistilor Street Magurele Romania
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14
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Selcan Turker N, Yekta Özer A, Kutlu B, Nohutcu R, Colak S, Ekizoglu M, Özalp M. The Effect of Different Sterilization Methods on Polypropylene Syringes. J Med Device 2018. [DOI: 10.1115/1.4039434] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
Abstract
This presents the influence of gamma irradiation on Pharmacopeia specifications, mechanical and flow parameters of polypropylene (PP) syringes. There has been significant progress in the terminal sterilization of single-use, disposable medical devices with gamma radiation sterilization due to the growing awareness of toxic residues during the ethylene oxide (EtO) sterilization. PP is a widely used polymer for the production of syringes because of its excellent mechanical and thermal properties and has expanded continuously over the last decade. Although 25 kGy was generally recommended for the gamma radiation sterilization of medical products, this radiation dose is high enough to produce substantial damage. Electron spin resonance (ESR) characteristics of irradiated syringes were also studied at normal (25 °C, 60% relative humidity) and accelerated (40 °C, 75% relative humidity) stability test conditions. It was found that the chemical and radiolytic changes and sterility assurance levels (SAL) after gamma radiation sterilization were different in PP syringes. It was shown that for two commercial syringes, E1 and E3, a SAL of 10−4 could be attained with only 10 kGy, with there being less detrimental radiation effects on E1. The differences in the radiosensitivity of the propylene syringes could be due to the different formulations and manufacturing processes. The results indicated that a commercial syringe, identified as E1 could be safely sterilized with gamma irradiation as the radicals decay over a period of days under normal conditions and quenched much faster under stability conditions. Furthermore, ESR technique could be used successfully in monitoring the radiosterilization of this material. Additionally, the confirmation and validation of the SAL doses which are below 25 kGy, will decrease the time and cost of the sterilization with less damaging effects of ionizing irradiation.
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Affiliation(s)
- N. Selcan Turker
- Department of Radiopharmacy, Faculty of Pharmacy, Hacettepe University, Sıhhiye 06100, Ankara, Turkey
- Harvard Medical School, MGH Athinoula A. Martinos Center for Biomedical Imaging, Boston, MA 02129
| | - A. Yekta Özer
- Department of Radiopharmacy, Faculty of Pharmacy, Hacettepe University, Sıhhiye 06100, Ankara, Turkey e-mail:
| | - Burak Kutlu
- Department of Periodontology, Faculty of Dentistry, Hacettepe University, Sıhhiye 06100, Ankara, Turkey
| | - Rahime Nohutcu
- Department of Periodontology, Faculty of Dentistry, Hacettepe University, Sıhhiye 06100, Ankara, Turkey
| | - Seyda Colak
- Department of Physics Engineering, Faculty of Engineering, Hacettepe University, Sıhhiye 06100, Ankara, Turkey
| | - Melike Ekizoglu
- Department of Pharmaceutical Microbiology, Faculty of Pharmacy, Hacettepe University, Sıhhiye 06100, Ankara, Turkey
| | - Meral Özalp
- Department of Pharmaceutical Microbiology, Faculty of Pharmacy, Hacettepe University, Sıhhiye 06100, Ankara, Turkey
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Turker NS, Özer AY, Çolak Ş, Kutlu B, Nohutçu R. ESR investigations of gamma irradiated medical devices. Appl Radiat Isot 2017; 130:121-130. [PMID: 28961487 DOI: 10.1016/j.apradiso.2017.09.026] [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] [Received: 02/27/2017] [Revised: 07/30/2017] [Accepted: 09/15/2017] [Indexed: 10/18/2022]
Abstract
Guided tissue regeneration (GTR) and guided bone regeneration (GBR) biomaterials have been employed in recent years for periodontal procedures. In the present study, widely used dental GTR/GBR biomaterials (grafts: G1, G2, G3 and membranes: M1, M2, M3, M4) were exposed to gamma irradiation at an absorbed dose range of 0-50kGy and the radiolytic intermediates that have been created in the samples upon irradiation were characterized in detail by Electron Spin Resonance (ESR) spectroscopy. We aimed to standardize the measurement conditions for practical applications of gamma radiation sterilization of GTR/GBR biomaterials. We investigated the characteristic features of free radicals in gamma irradiated GTR/GBR biomaterials and examined the stability of the induced radicals at room temperature and accelerated stability conditions with ESR spectroscopy including dose-response curves, microwave power studies, dosimetric features of the biomaterials, variations of the peak heights with temperature, and long term stabilities of the radical species. Long-term stability studies have shown that G1 is quite stable even in accelerated storage conditions. The signal intensities of graft-type GTR/GBR biomaterials stored in normal and stability conditions have decreased very rapidly even only a few days after gamma irradiation sterilization. Thus, those samples indicating relatively low stability features can be very good candidates for the radiosterilization process. The beta-tricalcium phosphate and PLGA containing G1 and M1 respectively have found to be the most gamma stable bone substitute biomaterials and be safely sterilized by gamma radiation. ESR spectroscopy is an appropriate technique in giving important detailed spectroscopic findings in the gamma radiation sterilization studies of GTR/GBR biomaterials.
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Affiliation(s)
- N Selcan Turker
- Hacettepe University, Faculty of Pharmacy, Department of Radiopharmacy, Ankara, Turkey
| | - A Yekta Özer
- Hacettepe University, Faculty of Pharmacy, Department of Radiopharmacy, Ankara, Turkey.
| | - Şeyda Çolak
- Hacettepe University, Faculty of Engineering, Department of Physics Engineering, Ankara, Turkey
| | - Burak Kutlu
- Hacettepe University, Faculty of Dentistry, Department of Periodontology, Ankara, Turkey
| | - Rahime Nohutçu
- Hacettepe University, Faculty of Dentistry, Department of Periodontology, Ankara, Turkey
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Sterilization, hydration-dehydration and tube fabrication of zwitterionic hydrogels. Biointerphases 2017; 12:02C411. [PMID: 28511543 DOI: 10.1116/1.4983502] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
Terminal sterilization of hydrogel-based biomaterials is crucial for their clinically relevant applications. The authors synthesized nonfouling zwitterionic hydrogels consisting of carboxybetaine (CB) acrylamide monomer and a carboxybetaine dimethacrylate crosslinker. The mechanical and biological stability of nonfouling hydrogels were investigated using three main terminal sterilization techniques, i.e., steam autoclave, ethylene oxide gas, and gamma irradiation. It was found that CB hydrogels are very stable at high temperature and pressure and in oxidative gas environments without changing their stress, modulus, and nonfouling properties. Gamma irradiation of CB hydrogels in dry state showed high mechanical and nonfouling stability by avoiding the adverse effect of the free radicals resulted from water inside the hydrogel network. The CB hydrogels can be dehydrated and hydrated back and forward reversibly in several cycles without any loss in mechanical properties, which is desirable for hydrogel storage, handling, and sterilization. The CB hydrogel tubes are easily prepared using a simple procedure, and they are uniformly transparent and tough after swelling. Furthermore, the good mechanical properties of the CB hydrogel tubes and their resistance to red blood cells indicate great potential of this nonfouling material for medical applications.
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Kim JT, Kim BS, Jeong HS, Heo YK, Shin SW, Lee JY, Shim YH, Lee DY. Effect of surface-treatments on flexibility and guided bone regeneration of titanium barrier membrane. JOURNAL OF THE KOREAN CRYSTAL GROWTH AND CRYSTAL TECHNOLOGY 2015. [DOI: 10.6111/jkcgct.2015.25.3.098] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Preparation of gelatin based porous biocomposite for bone tissue engineering and evaluation of gamma irradiation effect on its properties. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2015; 49:648-655. [DOI: 10.1016/j.msec.2015.01.066] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/08/2014] [Revised: 12/07/2014] [Accepted: 01/19/2015] [Indexed: 11/18/2022]
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