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Klüppel LE, Antonini F, Olate S, Nascimento FF, Albergaria-Barbosa JR, Mazzonetto R. Bone repair is influenced by different particle sizes of anorganic bovine bone matrix: a histologic and radiographic study in vivo. J Craniofac Surg 2015; 24:1074-7. [PMID: 23851743 DOI: 10.1097/scs.0b013e318286a0a3] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
PURPOSE The aim of this study was to analyze histologically and radiographically the influence of particle size of anorganic bovine bone matrix (ABBM) on bone repair. MATERIALS AND METHODS Four calvarial defects of 8 mm each were prepared in 18 adult New Zealand rabbits. The defects were then filled with either particulate autogenous bone (control group) or ABBM of large, medium, and small size granules. The animals were sacrificed at 15, 30, and 60 days after surgery. The samples were radiographically examined before being submitted to histological processing. RESULTS Autogenous bone showed a slight radiopacity at the beginning, which was increased at the final period, being very similar to the adjacent bone tissue. The large and medium size ABBM particles maintained the same radiographic behavior, showing a radiolucent area in the central portion of the defect at 60 days. ABBM of small size granules showed a slight radiolucity at the initial period, which was increased at the subsequent periods. More intense bone formation occurred in the control group (autogenous bone). All 3 particle sizes of the biomaterial resulted in inflammatory infiltration at 15 and 30 days. ABBM of small size granules lead to a greater amount of osteoid tissue, and the particles were almost totally reabsorbed within 60 days of implantation. CONCLUSIONS Autogenous bone graft lead to the best result in terms of bone defect repair; ABBM of large and medium size granules are not totally reabsorbed at the observed period; ABBM of small size granules was more intensively reabsorbed and led to a greater osteoid tissue formation when compared to the medium and large ABBM granules.
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Affiliation(s)
- Leandro Eduardo Klüppel
- Oral and Maxillofacial Surgery Department, Piracicaba School of Dentistry, Campinas State University, Piracicaba, Brazil
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Neunzehn J, Szuwart T, Wiesmann HP. Eggshells as natural calcium carbonate source in combination with hyaluronan as beneficial additives for bone graft materials, an in vitro study. Head Face Med 2015; 11:12. [PMID: 25885793 PMCID: PMC4436844 DOI: 10.1186/s13005-015-0070-0] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2014] [Accepted: 04/08/2015] [Indexed: 12/16/2022] Open
Abstract
Introduction In bone metabolism and the formation especially in bone substitution, calcium as basic module is of high importance. Different studies have shown that the use of eggshells as a bone substitute material is a promising and inexpensive alternative. In this in vitro study, the effects of eggshell granulate and calcium carbonate towards primary bovine osteoblasts were investigated. Hyaluronan (HA) was used as artificial extracellular matrix (ECM) for the used cells to facilitate proliferation and differentiation and to mimic the physiological requirements given by the egg in vivo. Methods Hyaluronan, eggshells, a combination of hyaluronan and eggshells and CaCO3 were applied to the cells as additive to the used standard medium (modified High Growth Enhancement Medium) in a concentration of 0,1 g/l. The effect of the additives in the culture medium was examined by proliferation tests, immunohistochemical staining (anti-collagen type I, anti-osteopontin, anti-osteonectin and anti-osteocalcin) and kinetic oxygen measurements. Results Our investigations revealed that all investigated additives show beneficial effect on osteoblast activity. Cell proliferation, differentiation and the metabolic activity of the differentiated cells could be influenced positively. Especially in the case cell cultures treated with eggshells the strongest effects were detected, while for the hyaluronan compared with eggshells, a weaker increase in cell activity was observed. Conclusion In summary, it can be stated that the investigated components come into consideration as beneficial supplements for bone graft materials especially for maxillo facial surgery application.
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Affiliation(s)
- Jörg Neunzehn
- Technische Universität Dresden, Institute of Material Science, Chair for Biomaterials, Budapester Strasse 27, D-01069, Dresden, Germany.
| | - Thomas Szuwart
- Department of Cranio-Maxillofacial Surgery, University Hospital of Muenster, Research Group Vascular Biology of Oral Structures (VABOS), Waldeyerstr 30, Muenster, 48149, Germany.
| | - Hans-Peter Wiesmann
- Technische Universität Dresden, Institute of Material Science, Chair for Biomaterials, Budapester Strasse 27, D-01069, Dresden, Germany.
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Uraz A, Gultekin SE, Senguven B, Karaduman B, Sofuoglu IP, Pehlivan S, Capan Y, Eren K. Histologic and histomorphometric assessment of eggshell-derived bone graft substitutes on bone healing in rats. J Clin Exp Dent 2013; 5:e23-9. [PMID: 24455047 PMCID: PMC3892234 DOI: 10.4317/jced.50968] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2012] [Accepted: 10/20/2012] [Indexed: 11/05/2022] Open
Abstract
OBJECTIVE The objective of this study was to histologically and histomorphometrically evaluate the efficacy of the new formulations of eggshell-derived calcium carbonate in rats. STUDY DESIGN The study was conducted on 30 adult male rats. Four standardized and circular intrabony defects were created in the both maxilla and mandibula of each animal. Three different graft materials were prepared as follows: 1) Material A: Eggshell-derived calcium carbonate combined with carrageenan gel, 2) Material B: Eggshell-derived calcium carbonate combined with xanthan gum gel, and 3) Material C: Eggshell-derived calcium carbonate powder. The right mandibular defect sites were grafted with Material A in all animals, and defects on the left were grafted with Material B. Defects on the right side of maxilla were received Material C in all animals, and all left maxillary defects were remained untreated as controls. The animals were sacrificed either postoperatively on the 15th day, postoperatively on the 30th day or postoperatively on the 45th day. Histomorphometric measurements were made of the areas of newly formed bone, necrotic bone, fibrous tissue and residual graft material. RESULTS Material A exhibited the highest level of osteoid formation followed by Material B and Material C on the 45th day. In terms of osteoid formation, statistically significant differences were observed between graft materials and controls at 45th day compared to 15th and 30th day (p<0.05). CONCLUSIONS Eggshell-derived graft substitutes in both gel and powder forms are biocompatible materials which may have the potential to enhance the new bone formation. Key words:Bone graft material, bone defects, eggshell, histopathological evaluation, rat.
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Affiliation(s)
- Ahu Uraz
- Department of Periodontology, Gazi University Faculty of Dentistry, Ankara, Turkey
| | - Sibel E Gultekin
- Department of Periodontology, Gazi University Faculty of Dentistry, Ankara, Turkey
| | - Burcu Senguven
- Department of Periodontology, Gazi University Faculty of Dentistry, Ankara, Turkey
| | - Burcu Karaduman
- Department of Periodontology, Gazi University Faculty of Dentistry, Ankara, Turkey
| | - Ilke P Sofuoglu
- Department of Periodontology, Gazi University Faculty of Dentistry, Ankara, Turkey
| | - Selcen Pehlivan
- Department of Periodontology, Gazi University Faculty of Dentistry, Ankara, Turkey
| | - Yilmaz Capan
- Department of Periodontology, Gazi University Faculty of Dentistry, Ankara, Turkey
| | - Kaya Eren
- Department of Periodontology, Gazi University Faculty of Dentistry, Ankara, Turkey
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Gruskin E, Doll BA, Futrell FW, Schmitz JP, Hollinger JO. Demineralized bone matrix in bone repair: history and use. Adv Drug Deliv Rev 2012; 64:1063-77. [PMID: 22728914 PMCID: PMC7103314 DOI: 10.1016/j.addr.2012.06.008] [Citation(s) in RCA: 278] [Impact Index Per Article: 23.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2012] [Revised: 06/15/2012] [Accepted: 06/15/2012] [Indexed: 11/27/2022]
Abstract
Demineralized bone matrix (DBM) is an osteoconductive and osteoinductive commercial biomaterial and approved medical device used in bone defects with a long track record of clinical use in diverse forms. True to its name and as an acid-extracted organic matrix from human bone sources, DBM retains much of the proteinaceous components native to bone, with small amounts of calcium-based solids, inorganic phosphates and some trace cell debris. Many of DBM's proteinaceous components (e.g., growth factors) are known to be potent osteogenic agents. Commercially sourced as putty, paste, sheets and flexible pieces, DBM provides a degradable matrix facilitating endogenous release of these compounds to the bone wound sites where it is surgically placed to fill bone defects, inducing new bone formation and accelerating healing. Given DBM's long clinical track record and commercial accessibility in standard forms and sources, opportunities to further develop and validate DBM as a versatile bone biomaterial in orthopedic repair and regenerative medicine contexts are attractive.
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Affiliation(s)
- Elliott Gruskin
- Synthes USA, 1302 Wrights Lane East, West Chester, PA 19380, USA.
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Kim H, Lee K, Ko CY, Kim HS, Shin HI, Kim T, Lee SH, Jeong D. The role of nacreous factors in preventing osteoporotic bone loss through both osteoblast activation and osteoclast inactivation. Biomaterials 2012; 33:7489-96. [PMID: 22809648 DOI: 10.1016/j.biomaterials.2012.06.098] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2012] [Accepted: 06/30/2012] [Indexed: 01/14/2023]
Abstract
Excessive bone resorption by osteoclasts relative to bone formation by osteoblasts results in the development of osteoporosis. Anti-osteoporotic agents that are able both to inhibit bone resorption and to stimulate bone formation are not available. We now show that water-soluble nacreous factors prepared from the pearl oyster Pteria martensii prevent osteoporotic bone loss associated with estrogen deficiency in mice mainly through osteoclast inactivation. Nacreous factors stimulated osteoblast biomineralization in vitro in association with activation of signaling by c-Jun NH(2)-terminal kinase (JNK) and Fos-related antigen-1 (Fra-1). They also suppressed both osteoclast formation by blocking up-regulation of nuclear factor of activated T cells cytoplasmic 1 (NFATc1) as well as bone pit formation mediated by mature osteoclasts, likely by disrupting the actin ring of these cells. Our findings thus show that the components of a natural material have beneficial effects on bone remodeling that are mediated through regulation of both osteoblast and osteoclast function. They may thus provide a basis for the development of biomimetic bone material as well as anti-osteoporotic agents.
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Affiliation(s)
- Hyunsoo Kim
- Department of Microbiology, Aging-Associated Vascular Disease Research Center, Yeungnam University College of Medicine, Nam-Gu, Daegu, Republic of Korea
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Bewertung von neuartigen Biomaterialien zum Zweck der Knochenrekonstruktion und -regeneration. DER ORTHOPADE 2009; 38:1020-8. [DOI: 10.1007/s00132-009-1491-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Durmuş E, Celik I, Aydin MF, Yildirim G, Sur E. Evaluation of the biocompatibility and osteoproductive activity of ostrich eggshell powder in experimentally induced calvarial defects in rabbits. J Biomed Mater Res B Appl Biomater 2008; 86:82-9. [PMID: 18076098 DOI: 10.1002/jbm.b.30990] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
The purpose of this study was to investigate the beneficial effects of particulate ostrich eggshell grafting on the healing of experimentally induced skull defects. The clinical, radiological, histological, and histomorphometrical findings of this material were compared with the results of commercially available demineralized bone matrix (DBM). The study was conducted on 18 adult New Zealand rabbits. One defect served as a control and the remaining ones either were filled with different sized eggshell particles or DBM, in each animal. Clinical and radiological inspections and histologic investigations of the animals were done at the 1st, 3rd, and 6th months of postoperative period. Radiologically, minimal bone regeneration was observed at the empty, control defect sites. The most advanced bone regeneration was in the DBM grafted defects. The eggshell particle grafted defect sites displayed weak bone regeneration at earlier stages, at 1st and 3rd months after operation when compared with demineralized bone matrix. Nevertheless, ossification was satisfactory at 6th month after operation when compared with the control defects. Within the limitations of this study, it was concluded that Ostrich eggshell powder (OSP) is a worth-while bone substitute because it is a safe, cheap, and easily available material. Long-term studies will clarify its possible role in maxillofacial surgery. Further sophisticated experiments should be undertaken before human implantation concerning its osteoproductive activity alone or in combination with other materials.
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Affiliation(s)
- Ercan Durmuş
- Department of Oral and Maxillofacial Surgery, Faculty of Dentistry, Selcuk University, Campus 42080, Konya, Turkiye.
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Laureano Filho JR, Castelo Branco BDL, Andrade ESS, Barbosa JRDA. Histological comparison of demineralized bone matrix and the Ricinus communis polymer on bone regeneration. Braz J Otorhinolaryngol 2008; 73:186-92. [PMID: 17589726 PMCID: PMC9450633 DOI: 10.1016/s1808-8694(15)31065-x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2006] [Accepted: 01/08/2007] [Indexed: 11/28/2022] Open
Abstract
AIM The aim of the present study is to make a histologic analysis the effects of a human demineralized bone matrix and a polyurethane resin derived from the Ricinus communis, on bone regeneration process. MATERIALS AND METHODS For this, 24 rabbits were submitted to two surgical calvaria bone defects, one on the right and another on the left side of the parietal suture. The animals were divided in two groups. In group I the experimental defect (right side) was treated with a human demineralized bone matrix, while in group II the experimental cavity was treated with the polyurethane resin derived from Ricinus communis. The control defects were filled with the animals own blood. The animals were slaughtered after subsequent periods of 04, 07 and 15 weeks. RESULTS The histological analysis revealed that all groups (control and experiment), presented increased bone regeneration with time, but this repair was faster in the control group, even showing important decrease in defect thickness. CONCLUSION Both materials proved to be biologically compatible, however polyurethane was more slowly resorbed presented considerable better results when compared with demineralized bone matrix.
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Abstract
BACKGROUND The aim of the present study was to investigate the effect of tissue engineering bone composed of bone marrow-derived osteoblasts and demineralized bone in repairing mandible defect. METHODS Bone marrow-derived osteoblasts of 20 rabbits were cultured and seeded into scaffold of allogeneic demineralized bone to construct tissue engineering bone graft in vitro, which was used to repair the 10 x 5-mm bone defect made in the same rabbit mandible edge. Implant of demineralized bone alone was as the control. Rabbits were killed according to the schedule: five after 2 weeks, five after 4 weeks, five after 8 weeks, five after 12 weeks, and the implants were harvested for gross, radiographic, and histological observation. RESULTS New bone formation at the margin region of defect and osteogenesis at the centre were observed in the implant of tissue engineering bone, and the bone formation pattern included osteogenesis, osteoconduction, and osteoinduction. In the implant of demineralized bone alone, the major bone formation pattern was 'creeping substitute'. CONCLUSIONS The tissue engineering bone graft constructed by autogenous bone marrow-derived osteoblasts and allogeneic demineralized bone was better than demineralized bone alone in bone formation capability, which might be an ideal graft for bone defect repair.
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Affiliation(s)
- Zhi Li
- Department of Oral and Maxillofacial Surgery, Wuhan University, China
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Maeda H, Wada N, Fujii S, Akamine A. Fibroblastic cells from human periapical granulation tissue preferentially form calcified matrices in decalcified boiled rat bone. Cell Tissue Res 2005; 320:135-40. [PMID: 15714285 DOI: 10.1007/s00441-004-1052-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2004] [Accepted: 11/09/2004] [Indexed: 10/25/2022]
Abstract
We have been studying the potential of human fibroblastic cells (HFC) from periapical granulation tissue to form a calcified matrix. Recently, we reported that inflamed periapical granulation tissue contains osteogenic cells. In the present study, we tested the hypothesis that HFC, cultured with decalcified bone (DB) of rat, might form much greater calcified matrices than with rat decalcified boiled bone (DBB), which was originally prepared as a negative control. HFC were cultured with DB or DBB in the presence or absence of 2 mM beta-glycerophosphate (beta-GP) and 50 microg/ml ascorbic acid. After six weeks of culture, a number of von Kossa-positive globular structures were unexpectedly observed inside DBB, but not DB. Without HFC, such structures were never seen in DBB incubated with 2 mM beta-GP and 50 microg/ml ascorbic acid. DB cultured with HFC under the same conditions did not show these structures. Electron-microscopic observation revealed that matrix vesicles aggregated on collagen fibrils around globular structures in DBB. Energy dispersive X-ray microanalysis confirmed that these structures were calcified matrices composed of calcium and phosphate. These results suggest that human periapical granulation tissue contains cells responsible for the formation of calcified matrices in DBB, and that DBB could serve as an excellent scaffold for the calcification of HFC, rather than DB.
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Affiliation(s)
- Hidefumi Maeda
- Department of Endodontology and Operative Dentistry, Division of Oral Rehabilitation, Faculty of Dental Science, Kyushu University, 3-1-1 Maidashi, Fukuoka, 812-8582, Japan.
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Abstract
The field of tissue engineering integrates the latest advances in molecular biology, biochemistry, engineering, material science, and medical transplantation. Researchers in the developing field of regenerative medicine have identified bone tissue engineering as an attractive translational target. Clinical problems requiring bone regeneration are diverse, and no single regeneration approach will likely resolve all defects. Recent advances in the field of tissue engineering have included the use of sophisticated biocompatible scaffolds, new postnatal multipotent cell populations, and the appropriate cellular stimulation. In particular, synthetic polymer scaffolds allow for fast and reproducible construction, while still retaining biocompatible characteristics. These criteria relate to the immediate goal of determining the ideal implant. The search is becoming a reality with widespread availability of biocompatible scaffolds; however, the desired parameters have not been clearly defined. Currently, most research focuses on the use of bone morphogenetic proteins (BMPs), specifically BMP-2 and BMP-7. These proteins induce osteogenic differentiation in vitro, as well as bone defect healing in vivo. Protein-scaffold interactions that enhance BMP binding are of the utmost importance, since prolonged BMP release creates the most osteogenic microenvironment. Transition into clinical studies has had only mild success and relies on large doses of BMPs for bone formation. Advances within the field of bone tissue engineering will likely overcome these challenges and lead to more clinically relevant therapies.
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Affiliation(s)
- Catherine M Cowan
- Department of Bioengineering, University of California Los Angeles, Los Angeles, California 90095, USA
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Harris CT, Cooper LF. Comparison of bone graft matrices for human mesenchymal stem cell-directed osteogenesis. ACTA ACUST UNITED AC 2004; 68:747-55. [PMID: 14986329 DOI: 10.1002/jbm.a.20107] [Citation(s) in RCA: 75] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Scaffolds to support cell-based tissue engineering are critical determinants of clinical efforts to regenerate and repair the body. Bone tissue engineering requires materials that are biocompatible, well vascularized, mechanically suited for bone function, integrated with the host skeleton, and support osteoinduction of the implanted cells that form new bone. The aim of this study was to compare the osteogenic potential of bone marrow-derived, culture expanded human mesenchymal stem cells (hMSCs) adherent to different scaffolds composed of various calcium phosphates. Cells were loaded onto 2 x 2 mm cubes of coral calcium carbonate-derived apatite, bovine bone-derived apatite, synthetic hydroxyapatite (HA)/tricalcium phosphate (TCP) (60:40%), or synthetic HA/TCP (20:80%) and placed into the dorsum of SCID mice for 5 weeks. Subsequent histomorphometric analysis of bone formation within the cubes revealed the absence of bone formation within the coral-derived apatite and the bovine bone-derived apatite. Bone formation within synthetic HA/TCP scaffolds was measured to be 8.8% (+/-2.7%) and 13.8% (+/-3.6%) of the total tissue present for the 60:40% and 20:80% materials, respectively. Minimal resorption was observed at this early time point. Scanning electron microscopy evaluation of loaded scaffolds indicates that cell loading was not a variable affecting the different bone formation outcomes in these four scaffolds. In this ectopic model, different apatite-containing scaffolds of similar morphology and porosity demonstrated marked differences in their ability to support osteoinduction by implanted hMSCs. The necessary induction of hMSCs along the osteoblastic lineage may be dependent, in part, on the local microenvironment established by the scaffold chemistry and interactions with the host.
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Affiliation(s)
- C T Harris
- Bone Biology and Implant Therapy Laboratory, University of North Carolina School of Dentistry, Chapel Hill, North Carolina 27599, USA
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Abstract
OBJECTIVE Facial osseous defects remain a major functional and esthetic challenge for the head and neck surgeon. Tissue engineering may provide advantageous alternatives to conventional therapies. The objective of the study was to evaluate the efficacy of gene therapy in the repair of osseous facial defects. STUDY DESIGN Blinded, controlled, prospective animal experiment. METHODS Thirty adult athymic nude rats were divided into five groups of six animals. Three groups were used as control subjects. Two groups were treated with 3.75 x 10(8) viral particles containing recombinant type 5 adenoviral vectors. One group received viruses that coded for beta-galactosidase production, another received viruses that coded for bone morphogenetic protein (BMP-2) production. After 120 days rats were examined at necropsy with precise planimetry, histological analysis of new bone growth, and radio-densitometric analysis of bone thickness. RESULTS Radio-densitometric measurements showed that BMP-2-treated nude athymic rats had significantly enhanced osseous repair compared with control subjects when evaluated by both radio-densitometry and histological examination. CONCLUSION Gene therapy-treated, immunosuppressed rodents had an enhanced osteoinductive repair of a dorsal osseous nasal defect.
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Affiliation(s)
- W H Lindsey
- Northern Virginia Center for Facial Plastic Surgery, Reston, Virginia 20191, USA
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Estrada LE, Dodge GR, Richardson DW, Farole A, Jimenez SA. Characterization of a biomaterial with cartilage-like properties expressing type X collagen generated in vitro using neonatal porcine articular and growth plate chondrocytes. Osteoarthritis Cartilage 2001; 9:169-77. [PMID: 11237664 DOI: 10.1053/joca.2000.0373] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
OBJECTIVE The availability of cartilage with or without the potential to ossify and suitable for surgical restoration and resurfacing of joints is an important clinical problem in arthritis-related pathology, trauma and reconstructive surgery. Here, we designed experiments to generate a biomaterial with cartilage-like properties by culturing neonatal porcine articular and growth plate chondrocytes on a hydrogel substrate and to examine the biochemical and histological characteristics of the resulting tissue. DESIGN Neonatal porcine epiphyseal and growth plate chondrocytes were cultured on poly(2-hydroxyethyl methacrylate) (polyHEMA)-coated dishes to prevent their adherence to plastic. We previously described that this procedure allows the maintenance of the chondrocyte-specific phenotype for > or = 8 months. Chondrocytes were isolated by successive enzymatic digestions and cultured at high density (>2.0 x 10(7) cells/ml) in DMEM with 10% FBS, 50 microg/ml ascorbic acid, glutamine, vitamins, and antibiotics for up to 10 weeks on 60 mm plastic culture dishes coated with polyHEMA. The tissues produced during culture were studied histologically and biochemically and were examined for cellular proliferation employing(3)H-thymidine incorporation and for their collagen production employing biosynthetic labeling with(14)C-proline and Western blot with specific antibodies. The expression of relevant collagen genes was examined employing RT-PCR. RESULTS Within 24 h of culture, isolated chondrocytes organized into well-formed clusters and in 2 weeks formed structures with gross appearance and consistency similar to those of natural cartilage. The wet weight of the tissue formed in vitro increased six-fold during the 10-week period of study. Cell proliferation measured by the incorporation of(3)H-thymidine increased during the first 3 weeks and reached a plateau in subsequent weeks. Histological examination showed that the cultures contained rounded chondrocytes embedded in an abundant cartilaginous extracellular matrix. The cartilage formed contained large amounts of collagen and sulfated proteoglycans as examined by staining with Masson's Trichrome and Alcian blue, respectively. Deposition of calcium in the deeper layers of the tissue was demonstrated with the von Kossa stain. Western analyses with specific antibodies showed that type II collagen was present from the first week and progressively increased in the cultures, whereas type X collagen was first detected at 4 weeks and increased with length of culture. When chondrocytes isolated from the growth plate were included, small amounts of type I collagen were detected in the medium of cultured biomaterial as expected. Type III collagen was not detected by Western blot over the 10-week period. High levels of type II and type X collagen gene expression were demonstrated by RT-PCR. CONCLUSION These studies demonstrate the production in vitro of cartilage-like tissue with similar morphological, histochemical and biochemical characteristics to those of natural growth plate cartilage. The cartilage generated in vitro has the potential to be used in reconstructive surgery and in joint resurfacing and restoration of skeletal defects.
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Affiliation(s)
- L E Estrada
- Department of Medicine, Division of Rheumatology, Thomas Jefferson University, Philadelphia, Pennsylvania 19107, USA
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Figueiredo ASD, Takita LC, Goldenberg S. Comparação entre a hidroxiapatita porosa de coral e o enxerto ósseo autógeno em coelhos. Acta Cir Bras 1997. [DOI: 10.1590/s0102-86501997000200002] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
O objetivo da pesquisa é a utilização da hidroxiapatita porosa de coral, como um xenoenxerto ósseo. Utilizou-se onze coelhos da raça Nova Zelândia, nos quais fez-se defeito padrão nas metáfises femorais distais. Nesses locais praticou-se o implante de hidroxiapatita porosa de coral ou enxerto ósseo autógeno. Fez-se estudo clínico, macroscópico, exames radiológicos e histológicos em intervalos de duas, quatro e doze semanas. Os resultados comparativos foram similares enter dois tipos de implantes. Concluiu-se que a hidroxiapatita porosa de coral é um substituto adequado para enxertos ósseos autógenos em coelhos.
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