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Soares AP, do Espírito Santo RF, Line SRP, Pinto MDGF, Santos PDM, Toralles MBP, do Espírito Santo AR. Effects of Pamidronate on Dental Enamel Formation Assessed by Light Microscopy, Energy-Dispersive X-Ray Analysis, Scanning Electron Microscopy, and Microhardness Testing. MICROSCOPY AND MICROANALYSIS : THE OFFICIAL JOURNAL OF MICROSCOPY SOCIETY OF AMERICA, MICROBEAM ANALYSIS SOCIETY, MICROSCOPICAL SOCIETY OF CANADA 2016; 22:640-648. [PMID: 27212049 DOI: 10.1017/s1431927616000726] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The aim of the present work was to investigate birefringence and morphology of the secretory-stage enamel organic extracellular matrix (EOECM), and structural and mechanical properties of mature enamel of upper incisors from adult rats that had been treated with pamidronate disodium (0.5 mg/kg/week for 56 days), using transmitted polarizing and bright-field light microscopies (TPLM and BFLM), energy-dispersive X-ray (EDX) analysis, scanning electron microscopy (SEM) and microhardness testing. BFLM showed no morphological changes of the EOECM in pamidronate and control groups, but TPLM revealed a statistically significant reduction in optical retardation values of birefringence brightness of pamidronate-treated rats when compared with control animals (p0.05). The present study indicates that pamidronate can affect birefringence of the secretory-stage EOECM, which does not seem to be associated with significant changes in morphological and/or mechanical properties of mature enamel.
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Affiliation(s)
- Ana P Soares
- 1Multidisciplinary Institute of Health,Federal University of Bahia-UFBA,Rua Rio de Contas,58,Quadra 17,Lote 58,Candeias,Vitória da Conquista,BACEP 45.029-094,Brasil
| | - Renan F do Espírito Santo
- 2Faculty of Pharmacy,Federal University of Bahia-UFBA,Rua Barão de Jeremoabo,S/N,Campus Universitário de Ondina,Ondina,Salvador,BA CEP 40.170-115,Brasil
| | - Sérgio R P Line
- 3Piracicaba Dental School,University of Campinas-UNICAMP,Av. Limeira,901,Areião,Piracicaba,SP CEP 13.414-903,Brasil
| | - Maria das G F Pinto
- 4School of Veterinary Medicine and Zootechny,Federal University of Bahia-UFBA,Av. Ademar de Barros,500,Ondina,Salvador,BA CEP 40.170-110,Brasil
| | - Pablo de M Santos
- 5Professor Edgard Santos University Hospital,Federal University of Bahia-UFBA,Rua Augusto Viana,S/N,Canela,Salvador,BA CEP 40.110-060,Brasil
| | - Maria Betania P Toralles
- 6Institute of Health Sciences,Federal University of Bahia-UFBA,Av. Reitor Miguel Calmon,S/N,Vale do Canela,Salvador,BA CEP 40.110-902,Brasil
| | - Alexandre R do Espírito Santo
- 6Institute of Health Sciences,Federal University of Bahia-UFBA,Av. Reitor Miguel Calmon,S/N,Vale do Canela,Salvador,BA CEP 40.110-902,Brasil
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Soares AP, do Espírito Santo RF, Line SRP, Pinto MDGF, Santos PDM, Toralles MBP, do Espírito Santo AR. Bisphosphonates: Pharmacokinetics, bioavailability, mechanisms of action, clinical applications in children, and effects on tooth development. ENVIRONMENTAL TOXICOLOGY AND PHARMACOLOGY 2016; 42:212-217. [PMID: 26895384 DOI: 10.1016/j.etap.2016.01.015] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/26/2015] [Revised: 01/18/2016] [Accepted: 01/20/2016] [Indexed: 06/05/2023]
Abstract
Bisphosphonates (BPs) avidly bind to calcium crystals and inhibit osteoclastic bone resorption, making them useful for treatment of skeletal disorders such as osteoporosis, Paget's disease, osteogenesis imperfecta and metastatic bone diseases. BPs therapeutically act by causing toxic effects on osteoclasts or interfering with specific intracellular pathways in those cells. BPs that possess nitrogen in their composition are called nitrogen-containing BPs (NBPs) and include alendronate, pamidronate, risedronate, ibandronate, and zoledronate. Simple BPs or non-NBPs do not have nitrogen in their composition, include etiodronate and clodronate, and were the first to be tested in animals and clinically used. Because BPs may be administered to pregnant women or children during deciduous and permanent teeth development, it is expected that they might disturb tooth eruption and development. A review of current literature on pharmacokinetics, bioavailability, mechanisms of action, and clinical applications of BPs in children, and their effects on tooth eruption and development is presented.
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Affiliation(s)
- Ana Prates Soares
- Multidisciplinary Institute of Health, Federal University of Bahia - UFBA, Rua Rio de Contas, 58, Quadra 17, Lote 58, Candeias, Vitória da Conquista, BA CEP 45.029-094, Brazil.
| | - Renan Fernandes do Espírito Santo
- Faculty of Pharmacy, Federal University of Bahia - UFBA, Rua Barão de Jeremoabo, S/N, Campus Universitário de Ondina, Ondina, Salvador, BA CEP 40.170-115, Brazil.
| | - Sérgio Roberto Peres Line
- Piracicaba Dental School, University of Campinas - UNICAMP, Av. Limeira, 901, Areião, Piracicaba, SP CEP 13.414-903, Brazil.
| | - Maria das Graças Farias Pinto
- School of Veterinary Medicine and Zootechny, Federal University of Bahia - UFBA, Av. Ademar de Barros, 500, Ondina, Salvador, BA CEP 40.170-110, Brazil.
| | - Pablo de Moura Santos
- Professor Edgard Santos University Hospital, Federal University of Bahia - UFBA, Rua Augusto Viana, S/N, Canela, Salvador, BA CEP 40.110-060, Brazil.
| | - Maria Betânia Pereira Toralles
- Institute of Health Sciences, Federal University of Bahia - UFBA, Av. Reitor Miguel Calmon, S/N, Vale do Canela, Salvador, BA CEP 40.110-902, Brazil.
| | - Alexandre Ribeiro do Espírito Santo
- Institute of Health Sciences, Federal University of Bahia - UFBA, Av. Reitor Miguel Calmon, S/N, Vale do Canela, Salvador, BA CEP 40.110-902, Brazil.
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Nelson-Filho P, Lucisano MP, Da Silva RAB, Da Silva RS, Serra MC, Gerlach RF, Neto FCR, Carneiro ZA, Zamarioli A, Morse L, Battaglino R. Systemically alendronate was incorporated into dental tissues but did not cause morphological or mechanical changes in rats teeth. Microsc Res Tech 2012; 75:1265-71. [PMID: 22508272 DOI: 10.1002/jemt.22059] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2011] [Accepted: 03/21/2012] [Indexed: 11/07/2022]
Abstract
This study evaluated the effect of the systemic use of sodium alendronate in rats in vivo. Forty-five Wistar rats aged 36 to 42 days and weighing 200 to 230 g were randomly assigned to a control group (n = 20), which received distilled water, and an experimental group (n = 25), which received 2 weekly doses of 1 mg/kg of chemically pure sodium alendronate. The animals were killed after 60 days of treatment. The tibias were removed for analysis of bone mineral density by dual-energy X-ray absorptiometry (DXA). Then, the maxillary incisors were extracted for analysis of the mineralized dental tissues using fluorescence spectroscopy (FS), scanning electron microscopy (SEM), bright field microscopy (BFM), and cross-sectional microhardness (CSMH) testing. DXA and CSMH data were subjected to statistical analysis by Kruskal-Wallis test (5% significance level). The experimental group presented higher bone mineral density than the control group by DXA. FS analysis revealed presence of alendronate in the mineralized dental tissues of the specimens of the experimental group. Significant morphological differences were not found by SEM and BFM. Enamel and dentin (100 and 300 μm from the dentinoenamel junction) CSMH data did not show significant difference between the control and experimental groups. Based on the obtained results, we conclude that while alendronate increased the bone mineral density and was incorporated into the mineralized dental tissues it did not cause significant alterations in the morphology and microhardness of rat incisor enamel and dentin.
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Affiliation(s)
- Paulo Nelson-Filho
- Department of Pediatric Clinics, Preventive and Community Dentistry, School of Dentistry of Ribeirão Preto, University of São Paulo, Ribeirão Preto, SP, Brazil.
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Cvikl B, Agis H, Stögerer K, Moritz A, Watzek G, Gruber R. The response of dental pulp-derived cells to zoledronate depends on the experimental model. Int Endod J 2010; 44:33-40. [PMID: 20812943 DOI: 10.1111/j.1365-2591.2010.01792.x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
AIM To investigate whether zoledronate (ZOL) can cause a cytotoxic response in dental pulp-derived cells (DPCs) in vitro. METHODOLOGY Cell activity was assessed utilizing MTT tests, (3) [H]thymidine, and (3) [H]leucine incorporation assays in human DPCs in response to ZOL. Cell activity assays were also preformed on calcium phosphate-coated plates. Cell death was analysed with annexin V/propidium iodide, trypan blue staining and Western blot analysis. RESULTS Micromolar concentrations of ZOL were required to decrease the activity of DPCs. The decreased activity of DPCs was associated with the occurrence of apoptosis and necrosis. No adverse effects were observed when DPCs were cultured on calcium phosphate-coated plates with ZOL. CONCLUSION High concentrations of soluble ZOL were required to cause adverse effects in vitro. These adverse effects are abolished when the bisphosphonate was bound to a mineralized surface. However, the clinical relevance of these results remains to be determined.
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Affiliation(s)
- B Cvikl
- Department of Conservative Dentistry, Medical University of Vienna, Vienna, Austria
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do Espírito Santo AR, Frozoni MRS, Ramos-Perez FMM, Novaes PD, Line SRP. Birefringence of the secretory-stage enamel organic extracellular matrix from rats submitted to successive injections of bisphosphonates. Connect Tissue Res 2010; 51:208-15. [PMID: 20109069 DOI: 10.3109/03008200903280115] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
The aim of the present study was to assess birefringence of the secretory-stage enamel organic extracellular matrix (ECM) and mechanical properties of mature enamel from rats treated with bisphosphonates. Longitudinal sections were obtained from upper incisors of rats that had been submitted to injections of bisodic etidronate (8 mg/Kg/day), sodium alendronate (30 microg/Kg/day), or sodium chloride as control (8 mg/Kg/day) for 42 days. Sections were immersed in 80% glycerin for 30 min and optical retardation of birefringence brightness in the secretory-stage enamel organic ECM was determined in nanometers. Etidronate-treated rats exhibited extensive morphological changes in the secretory-stage enamel organic ECM inclusive nonbirefringent conspicuous incremental lines, but presented optical retardation values similar to those showed by control rats (p > 0.05). Birefringence of secretory enamel organic ECM from etidronate rats presented an irregular aspect. Alendronate-treated rats did not show morphological alterations in the secretory-stage enamel organic ECM, however, they presented significant reduction in optical retardation of birefringence brightness when compared with control and etidronate rats (p < 0.01). Alendronate and etidronate groups exhibited reductions of approximately 6-10% in mature enamel cross-sectional microhardness when compared with control group (p < 0.01). Scanning electron microscopy analysis showed extensive alterations in mature enamel only from etidronate group with absence of enamel rods. The present work shows that bisphosphonates can affect the birefringence of the secretory-stage enamel organic ECM. The results presented here suggest that alterations in the supramolecular organization of the secretory-stage enamel organic ECM are a plausible mechanism by which environmental factors may cause enamel defects.
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Massa LF, Bradaschia-Correa V, Arana-Chavez VE. Immunocytochemical Study of Amelogenin Deposition during the Early Odontogenesis of Molars in Alendronate-treated Newborn Rats. J Histochem Cytochem 2006; 54:713-25. [PMID: 16461365 DOI: 10.1369/jhc.5a6853.2006] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Newborn rats were treated with sodium alendronate to study how enamel is formed and the effect of alendronate during early odontogenesis. Ultrastructural analysis combined with high-resolution immunocytochemistry for amelogenin was carried out. Twelve rats were subjected to daily SC injections of sodium alendronate (2.5 mg/kg/day) for 3 days on their dorsal region, whereas three rats were daily injected with saline solution as a control. Molar tooth germs from 3-day-old rats were fixed under microwave irradiation in 0.1% glutaraldehyde + 4% formaldehyde buffered at pH 7.2 with 0.1 M sodium cacodylate. The specimens were left undecalcified, postfixed with osmium tetroxide, dehydrated, and embedded in LR White resin. Ultrathin sections were incubated with a chicken anti-24-kDa rat amelogenin antibody, a secondary antibody, and finally with a protein A-gold complex. Large patches of amelogenin were present over the unmineralized mantle dentin and at early secretory ameloblasts. At more advanced stages, they were also detected at the enamel matrix, as well as in the mineralized dentin, at the periodontoblastic space of the dentinal tubules, and at the predentin. It is likely that the main effect of alendronate at early stages of odontogenesis is the increase of synthesis/secretion of amelogenin, promoting its deposition within the forming dentin and enamel.
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Affiliation(s)
- Luciana F Massa
- Laboratory of Mineralized Tissue Biology, Department of Cell and Developmental Biology, Institute of Biomedical Sciences, University of São Paulo, 05508-900 São Paulo, SP, Brazil
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