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A comparison between the effect of systemic and coated drug delivery in osteoporotic bone after dental implantation. Med Eng Phys 2022; 107:103859. [DOI: 10.1016/j.medengphy.2022.103859] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2022] [Revised: 07/21/2022] [Accepted: 07/22/2022] [Indexed: 11/20/2022]
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Shah FA, Ruscsák K, Palmquist A. 50 years of scanning electron microscopy of bone-a comprehensive overview of the important discoveries made and insights gained into bone material properties in health, disease, and taphonomy. Bone Res 2019; 7:15. [PMID: 31123620 PMCID: PMC6531483 DOI: 10.1038/s41413-019-0053-z] [Citation(s) in RCA: 43] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2019] [Revised: 04/09/2019] [Accepted: 04/11/2019] [Indexed: 02/06/2023] Open
Abstract
Bone is an architecturally complex system that constantly undergoes structural and functional optimisation through renewal and repair. The scanning electron microscope (SEM) is among the most frequently used instruments for examining bone. It offers the key advantage of very high spatial resolution coupled with a large depth of field and wide field of view. Interactions between incident electrons and atoms on the sample surface generate backscattered electrons, secondary electrons, and various other signals including X-rays that relay compositional and topographical information. Through selective removal or preservation of specific tissue components (organic, inorganic, cellular, vascular), their individual contribution(s) to the overall functional competence can be elucidated. With few restrictions on sample geometry and a variety of applicable sample-processing routes, a given sample may be conveniently adapted for multiple analytical methods. While a conventional SEM operates at high vacuum conditions that demand clean, dry, and electrically conductive samples, non-conductive materials (e.g., bone) can be imaged without significant modification from the natural state using an environmental scanning electron microscope. This review highlights important insights gained into bone microstructure and pathophysiology, bone response to implanted biomaterials, elemental analysis, SEM in paleoarchaeology, 3D imaging using focused ion beam techniques, correlative microscopy and in situ experiments. The capacity to image seamlessly across multiple length scales within the meso-micro-nano-continuum, the SEM lends itself to many unique and diverse applications, which attest to the versatility and user-friendly nature of this instrument for studying bone. Significant technological developments are anticipated for analysing bone using the SEM.
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Affiliation(s)
- Furqan A. Shah
- Department of Biomaterials, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - Krisztina Ruscsák
- Department of Biomaterials, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - Anders Palmquist
- Department of Biomaterials, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
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Macha IJ, Ben-Nissan B, Vilchevskaya EN, Morozova AS, Abali BE, Müller WH, Rickert W. Drug Delivery From Polymer-Based Nanopharmaceuticals-An Experimental Study Complemented by Simulations of Selected Diffusion Processes. Front Bioeng Biotechnol 2019; 7:37. [PMID: 30906737 PMCID: PMC6418005 DOI: 10.3389/fbioe.2019.00037] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2018] [Accepted: 02/13/2019] [Indexed: 11/17/2022] Open
Abstract
The success of medical therapy depends on the correct amount and the appropriate delivery of the required drugs for treatment. By using biodegradable polymers a drug delivery over a time span of weeks or even months is made possible. This opens up a variety of strategies for better medication. The drug is embedded in a biodegradable polymer (the "carrier") and injected in a particular position of the human body. As a consequence of the interplay between the diffusion process and the degrading polymer the drug is released in a controlled manner. In this work we study the controlled release of medication experimentally by measuring the delivered amount of drug within a cylindrical shell over a long time interval into the body fluid. Moreover, a simple continuum model of the Fickean type is initially proposed and solved in closed-form. It is used for simulating some of the observed release processes for this type of carrier and takes the geometry of the drug container explicitly into account. By comparing the measurement data and the model predictions diffusion coefficients are obtained. It turns out that within this simple model the coefficients change over time. This contradicts the idea that diffusion coefficients are constants independent of the considered geometry. The model is therefore extended by taking an additional absorption term into account leading to a concentration dependent diffusion coefficient. This could now be used for further predictions of drug release in carriers of different shape. For a better understanding of the complex diffusion and degradation phenomena the underlying physics is discussed in detail and even more sophisticated models involving different degradation and mass transport phenomena are proposed for future work and study.
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Affiliation(s)
- Innocent J. Macha
- Department of Mechanical and Industrial Engineering, University of Dar es Salaam, Dar es Salaam, Tanzania
- Institute of Mechanics, Faculty V of Mechanical Engineering and Transport Systems, Berlin University of Technology, LKM, Berlin, Germany
| | - Besim Ben-Nissan
- Faculty of Science, School of Life Sciences, University of Technology Sydney, Sydney, NSW, Australia
| | - Elena N. Vilchevskaya
- Applied Research Laboratory, Department of Theoretical Mechanics, Institute for Problems in Mechanical Engineering of the Russian Academy of Sciences and Peter the Great St. Petersburg Polytechnic University, St. Petersburg, Russia
| | - Anna S. Morozova
- Applied Research Laboratory, Department of Theoretical Mechanics, Institute for Problems in Mechanical Engineering of the Russian Academy of Sciences and Peter the Great St. Petersburg Polytechnic University, St. Petersburg, Russia
| | - Bilen Emek Abali
- Institute of Mechanics, Faculty V of Mechanical Engineering and Transport Systems, Berlin University of Technology, LKM, Berlin, Germany
| | - Wolfgang H. Müller
- Institute of Mechanics, Faculty V of Mechanical Engineering and Transport Systems, Berlin University of Technology, LKM, Berlin, Germany
| | - W. Rickert
- Institute of Mechanics, Faculty V of Mechanical Engineering and Transport Systems, Berlin University of Technology, LKM, Berlin, Germany
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Kim HS, Lee JI, Yang SS, Kim BS, Kim BC, Lee J. The effect of alendronate soaking and ultraviolet treatment on bone-implant interface. Clin Oral Implants Res 2016; 28:1164-1172. [PMID: 27458172 DOI: 10.1111/clr.12933] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/18/2016] [Indexed: 01/08/2023]
Abstract
OBJECTIVE Rapid and stable fixation of dental implants is crucial for successful treatment. Herein, we examined whether the simultaneous treatment of titanium implants with ultraviolet (UV) and alendronate (ALN) synergistically improved the bone-to-implant contact. MATERIALS AND METHODS We assessed the in vitro effects of UV radiation-treated (UV+/ALN-), ALN-soaked (UV-/ALN+), and UV radiation/ALN-treated (UV+/ALN+) titanium implants on cell proliferation, cytotoxicity, cell adhesion, and osteoblast differentiation using MG-63 osteoblast-like cells by the assays of MTS, live/dead, scanning electron microscopy (SEM), alkaline phosphatase (ALP) activity, and alizarin red S (AR-S) staining, respectively. Furthermore, in vivo bone formation at the bone-implant interface efficiency determined using a rabbit tibia implantation. Implants were divided into 3 experimental groups (UV+/ALN-, UV-/ALN+, UV+/ALN+) and the non-treated control (UV-/ALN-) group and transplanted into the proximal tibia of rabbits. At 1, 2, 4, and 8 weeks post-operation, bone formation at the bone-implant interface was evaluated by micro-computed tomography and histological analysis. RESULTS MG-63 cells cultured on UV+/ALN+ implants showed significantly higher cell proliferation, ALP activity, and calcium mineralization than those cultured on other implants (P < 0.05). Furthermore, SEM observation showed the highest increase in cell attachment and growth on the UV+/ALN+ implants. In vivo, experimental groups at all time points showed greater peri-implant bone formation than the control group. At 8 weeks post-implantation, in the UV+/ALN+ group, significantly higher bone formation was observed than the UV+/ALN- or UV-/ALN+ group, respectively (P < 0.05). CONCLUSIONS Treatment of titanium surfaces with UV and ALN may synergistically enhance osteoblastic differentiation and mineralization in vitro and enhance bone formation at the bone-implant interface in vivo. These data suggest that UV and ALN treatment may improve the osseointegration of titanium implants.
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Affiliation(s)
- Hyung Soo Kim
- Department of Oral and Maxillofacial Surgery, Daejeon Dental Hospital, Wonkwang University, Daejeon, Korea
| | - Jae In Lee
- Department of Biomedical and Molecular Sciences, Queen's University, Kingston, ON, Canada
| | - Sun Sik Yang
- Wonkwnag Bone Regeneration Research Institute, Wonkwang University, Iksan, Korea
| | | | - Bong Chul Kim
- Department of Oral and Maxillofacial Surgery, Daejeon Dental Hospital, Wonkwang University, Daejeon, Korea
| | - Jun Lee
- Department of Oral and Maxillofacial Surgery, Daejeon Dental Hospital, Wonkwang University, Daejeon, Korea
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Mardas N, Busetti J, de Figueiredo JAP, Mezzomo LA, Scarparo RK, Donos N. Guided bone regeneration in osteoporotic conditions following treatment with zoledronic acid. Clin Oral Implants Res 2016; 28:362-371. [PMID: 26920844 DOI: 10.1111/clr.12810] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/24/2016] [Indexed: 01/15/2023]
Abstract
OBJECTIVES To evaluate new bone formation in calvarial critical size defects (CSD) under dense polytetrafluoroethylene (d-PTFE), microporous membranes for guided bone regeneration (GBR) in healthy, osteoporotic and osteoporotic treated with zoledronic acid (ZA) rats. METHODS Forty-eight, female, 6-month old Wistar rats were included in the study. Osteoporosis was induced by ovariectomy (OVX) and calcium-deficient diet in 32 rats. Sixteen OVX rats were treated with a single dose of Zolendronic Acid (ZA) (OZ), while 16 OVX rats received no treatment (O). The remaining 16 rats were sham-operated and used as healthy controls (C). At 6 weeks following osteoporosis induction, two 5 mm CSD were created in the parietal bones and one of them was treated with a double d-PTFE membrane. The healing periods were 30 and 60 days. New bone formation (NB) was assessed by qualitative and quantitative histological analysis. RESULTS After 30 days of healing, NB (mean% (95% CI)) was 78.9% (21), 93.1% (9.3) and 84.2% (26.9) in the membrane treated defects and 18.8% (24.1), 27.1% (7.9) and 31% (38.8) in the untreated defects of group O, OZ and C, respectively. After 60 days of healing, NB was 78.3% (14.4), 95.8% (9) and 90.1% (26.1) in the membrane treated defects and 10.8% (17.4), 51.6% (39.4) and 15.7% (12.1) in the untreated defects of group O, OZ and C, respectively. Hierarchical analysis of variance showed that treatment with ZA (P = 0.001) and the use of membrane (P = 0.000) significantly increased new bone formation while presence of osteoporosis may have reduced new bone formation (P = 0.028). CONCLUSION d-PTFE membranes for GBR promote bone healing in osteoporotic and healthy rats. Treatment with ZA may improve new bone formation in osteoporotic rats.
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Affiliation(s)
- Nikos Mardas
- Centre for Adult Oral Health, Institute of Dentistry, Bart's & The London School of Medicine & Dentistry, Queen Mary University, London, UK
| | - Juliano Busetti
- Dental School, Pontifical Catholic University of Rio Grande do Sul, Porto Alegre, Brazil
| | | | - Luis André Mezzomo
- Department of Dentistry, Federal University of Santa Catarina, Florianópolis, Brazil
| | | | - Nikolaos Donos
- Clinical Oral Research Centre, Institute of Dentistry, Bart's & The London School of Medicine & Dentistry, Queen Mary University, London, UK
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Unmet needs and current and future approaches for osteoporotic patients at high risk of hip fracture. Arch Osteoporos 2016; 11:37. [PMID: 27800591 PMCID: PMC5306171 DOI: 10.1007/s11657-016-0292-1] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/20/2016] [Accepted: 10/25/2016] [Indexed: 02/03/2023]
Abstract
UNLABELLED This review provides a critical analysis of currently available approaches to increase bone mass, structure and strength through drug therapy and of possible direct intra-osseous interventions for the management of patients at imminent risk of hip fracture. PURPOSE Osteoporotic hip fractures represent a particularly high burden in morbidity-, mortality- and health care-related costs. There are challenges and unmet needs in the early prevention of hip fractures, opening the perspective of new developments for the management of osteoporotic patients at imminent and/or at very high risk of hip fracture. Amongst them, preventive surgical intervention needs to be considered. METHODS A European Society for Clinical and Economic Aspects of Osteoporosis, Osteoarthritis and Musculoskeletal Diseases (ESCEO)/International Osteoporosis Foundation (IOF) working group reviewed the presently available intervention modalities including preventive surgical options for hip fragility. This paper represents a summary of the discussions. RESULTS Prevention of hip fracture is currently based on regular physical activity; prevention of falls; correction of nutritional deficiencies, including vitamin D repletion; and pharmacological intervention. However, efficacy of these various measures to reduce hip fractures is at most 50% and may need months or years before becoming effective. To face the challenges of early prevention of hip fractures for osteoporotic patients at imminent and/or at very high risk of hip fracture, preventive surgical intervention needs further investigation. CONCLUSION Preventive surgical intervention needs to be appraised for osteoporotic patients at imminent and/or at very high risk of hip fracture.
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Determination of spatially dependent diffusion parameters in bovine bone using Kalman filter. J Theor Biol 2015; 384:10-8. [PMID: 26275499 DOI: 10.1016/j.jtbi.2015.07.025] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2015] [Accepted: 07/18/2015] [Indexed: 11/21/2022]
Abstract
Although many studies have been made for homogenous constant diffusion, bone is an inhomogeneous material. It has been suggested that bone porosity decreases from the inner boundaries to the outer boundaries of the long bones. The diffusivity of substances in the bone matrix is believed to increase as the bone porosity increases. In this study, an experimental set up is used where bovine bone samples, saturated with potassium chloride (KCl), were put into distilled water and the conductivity of the water was followed. Chloride ions in the bone samples escaped out in the water through diffusion and the increase of the conductivity was measured. A one-dimensional, spatially dependent mathematical model describing the diffusion process is used. The diffusion parameters in the model are determined using a Kalman filter technique. The parameters for spatially dependent at endosteal and periosteal surfaces are found to be (12.8 ± 4.7) × 10(-11) and (5 ± 3.5) × 10(-11)m(2)/s respectively. The mathematical model function using the obtained diffusion parameters fits very well with the experimental data with mean square error varies from 0.06 × 10(-6) to 0.183 × 10(-6) (μS/m)(2).
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Influence of the local application of sodium alendronate gel on osseointegration of titanium implants. Int J Oral Maxillofac Surg 2015; 44:1423-9. [DOI: 10.1016/j.ijom.2015.05.013] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2014] [Revised: 04/01/2015] [Accepted: 05/20/2015] [Indexed: 11/19/2022]
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Piccinini M, Cugnoni J, Botsis J, Ammann P, Wiskott A. Influence of gait loads on implant integration in rat tibiae: Experimental and numerical analysis. J Biomech 2014; 47:3255-63. [DOI: 10.1016/j.jbiomech.2014.08.023] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2014] [Revised: 08/02/2014] [Accepted: 08/25/2014] [Indexed: 11/29/2022]
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Harrison N, Field JR, Quondamatteo F, Curtin W, McHugh PE, Mc Donnell P. Preclinical trial of a novel surface architecture for improved primary fixation of cementless orthopaedic implants. Clin Biomech (Bristol, Avon) 2014; 29:861-8. [PMID: 25156456 DOI: 10.1016/j.clinbiomech.2014.07.007] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/02/2014] [Revised: 07/25/2014] [Accepted: 07/30/2014] [Indexed: 02/07/2023]
Abstract
BACKGROUND A new surface architecture for cementless orthopaedic implants (OsteoAnchor), which incorporates a multitude of tiny anchor features for enhancing primary fixation, was tested in an ovine hemi-arthroplasty pilot study. METHODS Test animals were implanted with a hip stem component incorporating the OsteoAnchor surface architecture produced using additive layer manufacturing and control animals were implanted with stems containing a standard plasma sprayed titanium coating. FINDINGS Intra-operative surgeon feedback indicated that superior primary fixation was achieved for the OsteoAnchor stems and rapid return to normal gait and load bearing was observed post-operation. Following a 16-week recovery time, histological evaluation of the excised femurs revealed in-growth of healthy bone into the porous structure of the OsteoAnchor stems. Bone in-growth was not achieved for the plasma sprayed stems. INTERPRETATION These results indicate the potential for the OsteoAnchor surface architecture to enhance both the initial stability and long term lifetime of cementless orthopaedic implants.
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Affiliation(s)
- Noel Harrison
- Biomechanics Research Centre (BMEC), Biomedical Engineering, College of Engineering, National University of Ireland, Galway, Ireland
| | - John R Field
- Centre for Orthopaedic and Trauma Research (COTR), University of Adelaide, South Australia, Australia
| | - Fabio Quondamatteo
- Skin and ECM Research Group, Anatomy, National University of Ireland, Galway, Ireland
| | | | - Peter E McHugh
- Biomechanics Research Centre (BMEC), Biomedical Engineering, College of Engineering, National University of Ireland, Galway, Ireland
| | - Pat Mc Donnell
- Biomechanics Research Centre (BMEC), Biomedical Engineering, College of Engineering, National University of Ireland, Galway, Ireland.
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Möller B, Wiltfang J, Acil Y, Gierloff M, Lippross S, Terheyden H. Prevention of the surface resorption of bone grafts by topical application of bisphosphonate on different carrier materials. Clin Oral Investig 2014; 18:2203-11. [DOI: 10.1007/s00784-014-1202-9] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2012] [Accepted: 01/30/2014] [Indexed: 10/25/2022]
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Fazil M, Ali A, Baboota S, Sahni JK, Ali J. Exploring drug delivery systems for treating osteoporosis. Expert Opin Drug Deliv 2013; 10:1123-36. [DOI: 10.1517/17425247.2013.785518] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Biomedical applications of bisphosphonates. J Control Release 2013; 167:175-88. [PMID: 23395668 DOI: 10.1016/j.jconrel.2013.01.032] [Citation(s) in RCA: 114] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2012] [Revised: 12/24/2012] [Accepted: 01/30/2013] [Indexed: 02/08/2023]
Abstract
Since their discovery over 100 years ago, bisphosphonates have been used industrially as corrosion inhibitors and complexing agents. With the discovery of their pharmacological activity in the late 1960s, implicating their high affinity for hydroxyapatite, bisphosphonates have been employed in the treatment of bone diseases and as targeting agents for colloids and drugs. They have notably been investigated for the treatment of Paget's disease, osteoporosis, bone metastases, malignancy-associated hypercalcemia, and pediatric bone diseases. Currently, they are first-line medications for several of these diseases and are taken by millions of patients worldwide, mostly postmenopausal women. A major problem associated with their use is their low oral bioavailability. Several delivery systems have been proposed to improve their absorption and to direct them to sites other than bone tissues. Beyond their important pharmacological role, the medical applications of bisphosphonates are numerous. In addition, their metal-chelating properties have been exploited to coat and stabilize implants, nanoparticulates, and contrast agents. In this contribution, we review the pharmacological and clinical uses of bisphosphonates and highlight their novel applications in the pharmaceutical and biomedical fields.
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Albadawi H, Haurani MJ, Oklu R, Trubiano JP, Laub PJ, Yoo HJ, Watkins MT. Differential effect of zoledronic acid on human vascular smooth muscle cells. J Surg Res 2012; 182:339-46. [PMID: 23164362 DOI: 10.1016/j.jss.2012.10.033] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2012] [Revised: 10/09/2012] [Accepted: 10/17/2012] [Indexed: 01/09/2023]
Abstract
INTRODUCTION The activation of human vascular smooth muscle cell proliferation, adhesion and migration is essential for intimal hyperplasia formation. These experiments were designed to test whether zoledronic acid (ZA) would modulate indices of human smooth muscle cell activation, exert differential effects on proliferating versus quiescent cells, and determine whether these effects were dependent on GTPase binding proteins prenylation. ZA was chosen for testing in these experiments because it is clinically used in humans with cancer, and has been shown to modulate rat smooth muscle cell proliferation and migration. METHODS Human aortic smooth muscle cells (HASMC) were cultured under either proliferating or growth arrest (quiescent) conditions in the presence or absence of ZA for 48 hours, whereupon the effect of ZA on HASMC proliferation, cellular viability, metabolic activity, and membrane integrity were compared. In addition, the effect of ZA on adhesion and migration were assessed in proliferating cells. The effect of increased concentration of ZA on the mevalonate pathway and genomic/cellular stress related poly-adenosine diphosphate ribose polymerase enzyme activity were assessed using the relative prenylation of Rap-1A/B protein and the formation of poly adenosine diphosphate-ribosylated protein, respectively. RESULTS There was a dose dependent inhibition of cellular proliferation, adhesion and migration following ZA treatment. ZA treatment decreased indices of cellular viability and significantly increased membrane injury in proliferating versus quiescent cells. This was correlated with the appearance of unprenylated Rap-1A protein and dose dependent down regulation of activity. CONCLUSIONS These data suggest that ZA is effective in inhibiting HASMC proliferation, adhesion, and migration, which coincide with the appearance of unprenylated RAP-1A/B protein, thereby suggesting that the mevalonate pathway may play a role in the inhibition of HASMC activation.
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Affiliation(s)
- Hassan Albadawi
- Division of Vascular and Endovascular Surgery, Department of Surgery, Massachusetts General Hospital, Harvard Medical School, Boston, MA 02114, USA
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Niu S, Cao X, Zhang Y, Zhu Q, Zhu J, Zhen P. Peri-implant and systemic effects of high-/low-affinity bisphosphonate-hydroxyapatite composite coatings in a rabbit model with peri-implant high bone turnover. BMC Musculoskelet Disord 2012; 13:97. [PMID: 22686414 PMCID: PMC3414815 DOI: 10.1186/1471-2474-13-97] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/14/2011] [Accepted: 06/11/2012] [Indexed: 11/11/2022] Open
Abstract
Background Hydroxyapatite (HA) coatings composed with bisphosphonates (BPs) which have high mineral-binding affinities have been confirmed to successfully enhance implant stability. However, few previous studies focused on HA coatings composed with low-affinity BPs or on systemic effects of locally released BPs. Methods In this long-term study, we developed two kinds of BP-HA composite coatings using either high-affinity BP (alendronate, ALN) or low-affinity BP (risedronate, RIS). Thirty-six rabbits were divided into three groups according to different coating applications (group I: HA, group II: ALN-HA, and group III: RIS-HA). Implants were inserted into the proximal region of the medullary cavity of the left tibiay. At insertion, 2 × 108 wear particles were injected around implants to induce a peri-implant high bone turnover environment. Both local (left tibias) and systemic (right tibias and lumbar vertebrae) inhibitory effect on bone resorption were compared, including bone-implant integration, bone architecture, bone mineral density (BMD), implant stability, and serum levels of bone turnover markers. Results The results indicated that ALN-HA composite coating, which could induce higher bone-implant contact (BIC) ratio, bone mass augmentation, BMD, and implant stability in the peri-implant region, was more potent on peri-implant bone, while RIS-HA composite coating, which had significant systemic effect, was more potent on non-peri-implant bone, especially lumbar vertebrae. Conclusions It is instructive and meaningful to further clinical studies that we could choose different BP-HA composite coatings according to the patient’s condition.
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Affiliation(s)
- Shun Niu
- Department of Orthopaedics, Xi Jing Hospital, The Fourth Military Medical University, Xi'an, Shaanxi, China
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Verron E, Gauthier O, Janvier P, Pilet P, Lesoeur J, Bujoli B, Guicheux J, Bouler JM. In vivo bone augmentation in an osteoporotic environment using bisphosphonate-loaded calcium deficient apatite. Biomaterials 2011; 31:7776-84. [PMID: 20643480 DOI: 10.1016/j.biomaterials.2010.06.047] [Citation(s) in RCA: 76] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2010] [Accepted: 06/28/2010] [Indexed: 01/22/2023]
Abstract
Resorbable calcium phosphate (CaP) biomaterials have demonstrated considerable efficacy in bone reconstructive surgery. Furthermore, bisphosphonates (BPs) are well known anti-resorptive agents largely used in clinical treatments for osteoporosis. An injectable BP-combined CaP matrix has been developed in order to biologically reinforce osteoporotic bone by increasing the bone fraction and improving bone micro-architecture. Our previous in vitro studies have shown that CaP is effective for loading and releasing BPs at doses that can inhibit excessive bone resorption without affecting osteoblasts. In vivo studies in relevant animal models are necessary to explore the effect of our injectable BP-combined biomaterial on femur bone structure by performing three-dimensional microtomography analysis, histological studies and SEM observations. Firstly, in rat model, our BP-combined CaP matrix significantly improved the bone micro-architecture as compared to CaP alone. The implantation of the BP-loaded biomaterial within proximal femurs of osteoporotic ewes led to a significant increase in relative bone content and an improvement of its micro-architecture. These modifications were confirmed by histological and SEM observations, which revealed CaP granule resorption and new bone trabeculae formation. This approach could be considered in the future for preventing osteoporotic fractures that are preferentially localized in the proximal femur, vertebral bodies or wrist.
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Affiliation(s)
- Elise Verron
- PRES UNAM, INSERM UMR 791, LIOAD, BP 84215, Nantes, France
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