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Miranda GHN, Alencar de Oliveira Lima L, Bittencourt LO, dos Santos SM, Platini Caldas de Souza M, Nogueira LS, de Oliveira EHC, Monteiro MC, Dionizio A, Leite AL, Pessan JP, Buzalaf MAR, Lima RR. Effects of long-term fluoride exposure are associated with oxidative biochemistry impairment and global proteomic modulation, but not genotoxicity, in parotid glands of mice. PLoS One 2022; 17:e0261252. [PMID: 35085268 PMCID: PMC8794182 DOI: 10.1371/journal.pone.0261252] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2021] [Accepted: 11/25/2021] [Indexed: 11/18/2022] Open
Abstract
BACKGROUND Fluoride has become widely used in dentistry because of its effectiveness in caries control. However, evidence indicates that excessive intake interferes with the metabolic processes of different tissues. Thus, this study aimed to investigate the effects of long-term exposure to F on the parotid salivary gland of mice, from the analysis of oxidative, proteomic and genotoxic parameters. MATERIALS AND METHODS The animals received deionized water containing 0, 10 or 50 mg/L of F, as sodium fluoride, for 60 days. After, parotid glands were collected for analysis of oxidative biochemistry, global proteomic profile, genotoxicity assessment and histopathological analyses. RESULTS The results revealed that exposure to fluoride interfered in the biochemical homeostasis of the parotid gland, with increased levels of thiobarbituric acid reactive species and reduced glutathione in the exposed groups; as well as promoted alteration of the glandular proteomic profile in these groups, especially in structural proteins and proteins related to oxidative stress. However, genotoxic assessment demonstrated that exposure to fluoride did not interfere with DNA integrity in these concentrations and durations of exposure. Also, it was not observed histopathological alterations in parotid gland. CONCLUSIONS Thus, our results suggest that long-term exposure to fluoride promoted modulation of the proteomic and biochemical profile in the parotid glands, without inducing damage to the genetic component. These findings reinforce the importance of rationalizing the use of fluorides to maximize their preventative effects while minimizing the environmental risks.
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Affiliation(s)
- Giza Hellen Nonato Miranda
- Laboratory of Functional and Structural Biology, Institute of Biological Sciences, Federal University of Pará, Belém, PA, Brazil
| | | | - Leonardo Oliveira Bittencourt
- Laboratory of Functional and Structural Biology, Institute of Biological Sciences, Federal University of Pará, Belém, PA, Brazil
| | - Sávio Monteiro dos Santos
- Laboratory of Clinical Immunology and Oxidative Stress, Pharmacy Faculty, Institute of Health Science, Federal University of Pará, Belém, PA, Brazil
| | | | | | | | - Marta Chagas Monteiro
- Laboratory of Clinical Immunology and Oxidative Stress, Pharmacy Faculty, Institute of Health Science, Federal University of Pará, Belém, PA, Brazil
| | - Aline Dionizio
- Department of Biological Sciences, Bauru Dental School, University of São Paulo, Bauru, SP, Brazil
| | - Aline Lima Leite
- Department of Chemistry, University of Nebraska-Lincoln, Lincoln, Nebraska, United States of America
| | - Juliano Pelim Pessan
- Department of Preventive and Restorative Dentistry, School of Dentistry, São Paulo State University (UNESP), Araçatuba, SP, Brazil
| | | | - Rafael Rodrigues Lima
- Laboratory of Functional and Structural Biology, Institute of Biological Sciences, Federal University of Pará, Belém, PA, Brazil
- * E-mail:
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Lima LADO, Miranda GHN, Aragão WAB, Bittencourt LO, Dos Santos SM, de Souza MPC, Nogueira LS, de Oliveira EHC, Monteiro MC, Dionizio A, Leite AL, Pessan JP, Buzalaf MAR, Lima RR. Effects of Fluoride on Submandibular Glands of Mice: Changes in Oxidative Biochemistry, Proteomic Profile, and Genotoxicity. Front Pharmacol 2021; 12:715394. [PMID: 34646132 PMCID: PMC8503261 DOI: 10.3389/fphar.2021.715394] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2021] [Accepted: 08/04/2021] [Indexed: 01/21/2023] Open
Abstract
Although fluoride (F) is well-known to prevent dental caries, changes in cell processes in different tissues have been associated with its excessive exposure. Thus, this study aimed to evaluate the effects of F exposure on biochemical, proteomic, and genotoxic parameters of submandibular glands. Twenty one old rats (n = 30) were allocated into three groups: 60 days administration of drinking water containing 10 mgF/L, 50 mgF/L, or only deionized water (control). The submandibular glands were collected for oxidative biochemistry, protein expression profile, and genotoxic potential analyses. The results showed that both F concentrations increased the levels of thiobarbituric acid–reactive substances (TBARS) and reduced glutathione (GSH) and changed the proteomic profile, mainly regarding the cytoskeleton and cellular activity. Only the exposure to 50 mgF/L induced significant changes in DNA integrity. These findings reinforce the importance of continuous monitoring of F concentration in drinking water and the need for strategies to minimize F intake from other sources to obtain maximum preventive/therapeutic effects and avoid potential adverse effects.
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Affiliation(s)
| | - Giza Hellen Nonato Miranda
- Laboratory of Functional and Structural Biology, Institute of Biological Sciences, Federal University of Pará, Belém, Brazil
| | - Walessa Alana Bragança Aragão
- Laboratory of Functional and Structural Biology, Institute of Biological Sciences, Federal University of Pará, Belém, Brazil
| | - Leonardo Oliveira Bittencourt
- Laboratory of Functional and Structural Biology, Institute of Biological Sciences, Federal University of Pará, Belém, Brazil
| | - Sávio Monteiro Dos Santos
- Laboratory of Clinical Immunology and Oxidative Stress, Faculty of Pharmacy, Institute of Health Sciences, Federal University of Pará, Belém, Brazil
| | | | - Lygia S Nogueira
- Laboratory of Cell Culture and Cytogenetics, Environment Section, Evandro Chagas Institute, Ananindeua, Brazil
| | | | - Marta Chagas Monteiro
- Laboratory of Clinical Immunology and Oxidative Stress, Faculty of Pharmacy, Institute of Health Sciences, Federal University of Pará, Belém, Brazil
| | - Aline Dionizio
- Department of Biological Sciences, Bauru School of Dentistry, University of São Paulo, Bauru, Brazil
| | - Aline Lima Leite
- Department of Chemistry, University of Nebraska-Lincoln, Lincoln, NE, United States
| | - Juliano Pelim Pessan
- Department of Preventive and Restorative Dentistry, School of Dentistry, São Paulo State University (UNESP), Araçatuba, Brazil
| | | | - Rafael Rodrigues Lima
- Laboratory of Functional and Structural Biology, Institute of Biological Sciences, Federal University of Pará, Belém, Brazil
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Dionizio A, Melo CGS, Sabino-Arias IT, Araujo TT, Ventura TMO, Leite AL, Souza SRG, Santos EX, Heubel AD, Souza JG, Perles JVCM, Zanoni JN, Buzalaf MAR. Effects of acute fluoride exposure on the jejunum and ileum of rats: Insights from proteomic and enteric innervation analysis. Sci Total Environ 2020; 741:140419. [PMID: 32886984 DOI: 10.1016/j.scitotenv.2020.140419] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/27/2020] [Revised: 06/04/2020] [Accepted: 06/20/2020] [Indexed: 06/11/2023]
Abstract
Fluoride (F) is largely employed in dentistry, in therapeutic doses, to control caries. However, excessive intake may lead to adverse effects in the body. Since F is absorbed mostly from the gastrointestinal tract (GIT), gastrointestinal symptoms are the first signs following acute F exposure. Nevertheless, little is known about the mechanistic events that lead to these symptoms. Therefore, the present study evaluated changes in the proteomic profile as well as morphological changes in the jejunum and ileum of rats upon acute exposure to F. Male rats received, by gastric gavage, a single dose of F containing 0 (control) or 25 mg/Kg for 30 days. Upon exposure to F, there was a decrease in the thickness of the tunic muscularis for both segments and a decrease in the thickness of the wall only for the ileum. In addition, a decrease in the density of HuC/D-IR neurons and nNOS-IR neurons was found for the jejunum, but for the ileum only nNOS-IR neurons were decreased upon F exposure. Moreover, SP-IR varicosities were increased in both segments, while VIP-IR varicosities were increased in the jejunum and decreased in the ileum. As for the proteomic analysis, the proteins with altered expression were mostly negatively regulated and associated mainly with protein synthesis and energy metabolism. Proteomics also revealed alterations in proteins involved in oxidative/antioxidant defense, apoptosis and as well as in cytoskeletal proteins. Our results, when analyzed together, suggest that the gastrointestinal symptoms found in cases of acute F exposure might be related to the morphological alterations in the gut (decrease in the thickness of the tunica muscularis) that, at the molecular level, can be explained by alterations in the gut vipergic innervation and in proteins that regulate the cytoskeleton.
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Affiliation(s)
- Aline Dionizio
- Department of Biological Sciences, Bauru School of Dentistry, University of São Paulo, Bauru, Brazil
| | | | | | - Tamara Teodoro Araujo
- Department of Biological Sciences, Bauru School of Dentistry, University of São Paulo, Bauru, Brazil
| | | | - Aline Lima Leite
- Department of Biological Sciences, Bauru School of Dentistry, University of São Paulo, Bauru, Brazil
| | | | - Erika Xavier Santos
- Department of Morphophysiological Sciences, State University of Maringá, Maringá, Brazil
| | | | - Juliana Gadelha Souza
- Department of Biological Sciences, Bauru School of Dentistry, University of São Paulo, Bauru, Brazil
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Cavecci-Mendonça B, Cavalcante de Souza Vieira J, Monteiro de Lima P, Leite AL, Buzalaf MAR, Zara LF, de Magalhães Padilha P. Study of proteins with mercury in fish from the Amazon region. Food Chem 2019; 309:125460. [PMID: 31732251 DOI: 10.1016/j.foodchem.2019.125460] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2019] [Revised: 08/18/2019] [Accepted: 09/03/2019] [Indexed: 11/25/2022]
Abstract
The high concentrations of mercury found in Amazon have been intensively studied by the scientific community in the last decades. These mercurial species bind preferentially to proteins. Therefore, this work proposal sought to obtain the fractionation, identification and study of mercury - bound proteins present in samples of muscular and hepatic tissue from fish collected in the reservoir of the Jirau Hydroelectric Power Plant - on the Madeira River. Two-dimensional electrophoresis (2D-PAGE) for protein fractionation, graphite furnace atomic absorption spectrometry (GFAAS) for the quantification of mercury and Mass Spectrometry (ESI-MS/MS) were used for the identification of proteins. Concluding the work with analysis of graphics from the Blast2go program. Two mercury - bound proteins were identified as triosephosphate isomerase A and Protein FAM45A. The data generated by the bioinformatics programs confirm the tendency of these proteins to be linked to mercury and elucity the possibles existing physiological and cellular interactions.
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Affiliation(s)
- Bruna Cavecci-Mendonça
- São Paulo State University Julio de Mesquita Filho, Botucatu, Department of Chemistry and Biochemistry, Brazil.
| | | | - Paula Monteiro de Lima
- São Paulo State University Julio de Mesquita Filho, Botucatu, Department of Chemistry and Biochemistry, Brazil
| | | | | | | | - Pedro de Magalhães Padilha
- São Paulo State University Julio de Mesquita Filho, Botucatu, Department of Chemistry and Biochemistry, Brazil
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Pelá VT, Prakki A, Wang L, Ventura TMS, de Souza E Silva CM, Cassiano LPS, Brianezzi LFF, Leite AL, Buzalaf MAR. The influence of fillers and protease inhibitors in experimental resins in the protein profile of the acquired pellicle formed in situ on enamel-resin specimens. Arch Oral Biol 2019; 108:104527. [PMID: 31472277 DOI: 10.1016/j.archoralbio.2019.104527] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2019] [Revised: 08/06/2019] [Accepted: 08/13/2019] [Indexed: 02/02/2023]
Abstract
OBJECTIVE This study evaluated the influence of the addition of fillers and/or protease inhibitors [(epigallocatechin gallate - EGCG) or (chlorhexidine - CHX)] in experimental resins in the protein profile of the acquired pellicle (AP) formed in situ on enamel-resin specimens. DESIGN 324 samples of bovine enamel were prepared (6 × 6 × 2 mm). The center of each sample was added with one of the following experimental resins (Bis-GMA+TEGDMA): no filler, no inhibitor (NF-NI); filler no inhibitor (F-NI); no filler plus CHX (NF-CHX); filler plus CHX (F-CHX); no filler plus EGCG (NF-EGCG); filler plus EGCG (F-EGCG). Nine subjects used a removable jaw appliance (BISPM - Bauru in situ pellicle model) with 2 slabs from each group. The AP was formed for 120 min, in 9 days and collected with electrode filter paper soaked in 3% citric acid. The pellicles collected were processed for analysis by LC-ESI-MS/MS. RESULTS A total of 140 proteins were found in the AP collected from all the substrates. Among them, 16 proteins were found in common in all the groups: 2 isoforms of Basic salivary proline-rich protein, Cystatin-S, Cystatin-AS, Cystatin-SN, Histatin-1, Ig alpha-1 chain C region, Lysozyme C, Mucin-7, Proline-rich protein 4, Protein S100-A9, Salivary acidic proline-rich phosphoprotein ½ and Statherin. Proteins with other functions, such as metabolism and transport, were also identified. CONCLUSION The composition of the experimental resins influenced the protein profile of the AP. This opens a new avenue for the development of new materials able to guide for AP engineering, thus conferring protection to the adjacent teeth.
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Affiliation(s)
- Vinícius Taioqui Pelá
- Department of Genetics and Evolution Federal University of Sao Carlos, São Carlos, SP, Brazil.
| | - Anuradha Prakki
- Department of Clinical Sciences, Faculty of Dentistry, University of Toronto, Toronto, ON, Canada.
| | - Linda Wang
- Department of Biological Sciences, Bauru School of Dentistry, University of São Paulo, Bauru, SP, Brazil.
| | | | | | - Luiza Paula Silva Cassiano
- Department of Biological Sciences, Bauru School of Dentistry, University of São Paulo, Bauru, SP, Brazil.
| | | | - Aline Lima Leite
- Department of Biological Sciences, Bauru School of Dentistry, University of São Paulo, Bauru, SP, Brazil.
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Lima Leite A, Silva Fernandes M, Charone S, Whitford GM, Everett ET, Buzalaf MAR. Proteomic Mapping of Dental Enamel Matrix from Inbred Mouse Strains: Unraveling Potential New Players in Enamel. Caries Res 2017; 52:78-87. [PMID: 29248934 DOI: 10.1159/000479039] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2016] [Accepted: 06/23/2017] [Indexed: 01/21/2023] Open
Abstract
Enamel formation is a complex 2-step process by which proteins are secreted to form an extracellular matrix, followed by massive protein degradation and subsequent mineralization. Excessive systemic exposure to fluoride can disrupt this process and lead to a condition known as dental fluorosis. The genetic background influences the responses of mineralized tissues to fluoride, such as dental fluorosis, observed in A/J and 129P3/J mice. The aim of the present study was to map the protein profile of enamel matrix from A/J and 129P3/J strains. Enamel matrix samples were obtained from A/J and 129P3/J mice and analyzed by 2-dimensional electrophoresis and liquid chromatography coupled with mass spectrometry. A total of 120 proteins were identified, and 7 of them were classified as putative uncharacterized proteins and analyzed in silico for structural and functional characterization. An interesting finding was the possibility of the uncharacterized sequence Q8BIS2 being an enzyme involved in the degradation of matrix proteins. Thus, the results provide a comprehensive view of the structure and function for putative uncharacterized proteins found in the enamel matrix that could help to elucidate the mechanisms involved in enamel biomineralization and genetic susceptibility to dental fluorosis.
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Affiliation(s)
- Aline Lima Leite
- Department of Biological Sciences, Bauru Dental School, University of São Paulo, São Paulo, Brazil
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7
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Delecrode TR, Siqueira WL, Zaidan FC, Bellini MR, Leite AL, Xiao Y, Rios D, Magalhães AC, Buzalaf MAR. Exposure to acids changes the proteomic of acquired dentine pellicle. J Dent 2015; 43:583-8. [DOI: 10.1016/j.jdent.2015.02.001] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2014] [Revised: 01/29/2015] [Accepted: 02/02/2015] [Indexed: 02/07/2023] Open
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Lima Leite A, Gualiume Vaz Madureira Lobo J, Barbosa da Silva Pereira HA, Silva Fernandes M, Martini T, Zucki F, Sumida DH, Rigalli A, Buzalaf MAR. Proteomic analysis of gastrocnemius muscle in rats with streptozotocin-induced diabetes and chronically exposed to fluoride. PLoS One 2014; 9:e106646. [PMID: 25180703 PMCID: PMC4152332 DOI: 10.1371/journal.pone.0106646] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2014] [Accepted: 07/31/2014] [Indexed: 02/01/2023] Open
Abstract
Administration of high doses of fluoride (F) can alter glucose homeostasis and lead to insulin resistance (IR). This study determined the profile of protein expression in the gastrocnemius muscle of rats with streptozotocin-induced diabetes that were chronically exposed to F. Male Wistar rats (60 days old) were randomly distributed into two groups of 18 animals. In one group, diabetes was induced through the administration of streptozotocin. Each group (D-diabetic and ND-non-diabetic) was further divided into 3 subgroups each of which was exposed to a different F concentration via drinking water (0 ppm, 10 ppm or 50 ppm F, as NaF). After 22 days of treatment, the gastrocnemius muscle was collected and submitted to proteomic analysis (2D-PAGE followed by LC-MS/MS). Protein functions were classified by the GO biological process (ClueGO v2.0.7+Clupedia v1.0.8) and protein-protein interaction networks were constructed (PSICQUIC, Cytoscape). Quantitative intensity analysis of the proteomic data revealed differential expression of 75 spots for ND0 vs. D0, 76 for ND10 vs.D10, 58 spots for ND50 vs. D50, 52 spots for D0 vs. D10 and 38 spots for D0 vs. D50. The GO annotations with the most significant terms in the comparisons of ND0 vs. D0, ND10 vs. D10, ND50 vs. D50, D0 vs. D10 and D0 vs. D50, were muscle contraction, carbohydrate catabolic processes, generation of precursor metabolites and energy, NAD metabolic processes and gluconeogenesis, respectively. Analysis of subnetworks revealed that, in all comparisons, proteins with fold changes interacted with GLUT4. GLUT4 interacting proteins, such as MDH and the stress proteins HSPB8 and GRP78, exhibited decreased expression when D animals were exposed to F. The presence of the two stress proteins indicates an increase in IR, which might worsen diabetes. Future studies should evaluate whether diabetic animals treated with F have increased IR, as well as which molecular mechanisms are involved.
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Affiliation(s)
- Aline Lima Leite
- Department of Biological Sciences, Bauru Dental School, University of São Paulo, Bauru, São Paulo, Brazil
- Department of Genetics and Evolution, Center of Biological Sciences and the Health, Federal University of São Carlos, São Carlos, São Paulo, Brazil
| | | | | | - Mileni Silva Fernandes
- Department of Genetics and Evolution, Center of Biological Sciences and the Health, Federal University of São Carlos, São Carlos, São Paulo, Brazil
| | - Tatiani Martini
- Department of Biological Sciences, Bauru Dental School, University of São Paulo, Bauru, São Paulo, Brazil
| | - Fernanda Zucki
- Department of Biological Sciences, Bauru Dental School, University of São Paulo, Bauru, São Paulo, Brazil
| | - Dóris Hissako Sumida
- Department of Basic Sciences, Araçatuba Dental School, UNESP – Universidade Estadual Paulista, Araçatuba, São Paulo, Brazil
| | - Alfredo Rigalli
- Bone Biology and Mineral Metabolism Laboratory, National Scientific and Technical Research Council (CONICET) School of Medicine, Rosario National University, Rosario, Santa Fe, Argentina
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Oliveira K, Leite AL, Pinho de Sousa A, Vinhas da Silva A. [Human tail: rare lesion with occult spinal dysraphism]. Cir Pediatr 2014; 27:146-148. [PMID: 25845106] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Human tails can be classified as either true tails or pseudotails. True human tails are rare clinical entities. We describe a newborn with a midline sacral cutaneous appendage. Magnetic resonance imaging of the lumbosacral area revealed occult spinal dysraphism with tethered cord and intradural lipoma. Prenatal diagnosis of left renal agenesis was confirmed on postnatal evaluation. Surgical excision of the appendage was performed and histopathological examination demonstrated a true tail. The child recovered uneventfully and has been asymptomatic for 3 years. Dorsal cutaneous appendages are a marker of underlying occult spinal dysraphism and requires detailed neuroimaging investigation in order to prevent irreversible neurological damaged.
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Fernandes MDS, Yanai MM, Martins GM, Iano FG, Leite AL, Cestari TM, Taga R, Buzalaf MAR, de Oliveira RC. Effects of fluoride in bone repair: an evaluation of RANKL, OPG and TRAP expression. Odontology 2012; 102:22-30. [DOI: 10.1007/s10266-012-0083-0] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2011] [Accepted: 07/11/2012] [Indexed: 11/28/2022]
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Buzalaf MAR, Rodrigues MHC, Pessan JP, Leite AL, Arana A, Villena RS, Forte FDS, Sampaio FC. Biomarkers of fluoride in children exposed to different sources of systemic fluoride. J Dent Res 2011; 90:215-9. [PMID: 21270463 DOI: 10.1177/0022034510385937] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
There has been no comparison between fluoride concentrations in urine and nails of children exposed to different sources of systemic fluoride. The aim of this study was to compare the relationship between fluoride intake with urinary fluoride excretion and fluoride concentrations in fingernails and toenails of children receiving fluoride from artificially fluoridated water (0.6-0.8 mg F/L, n = 25), naturally fluoridated water (0.6-0.9 mg F/L, n = 21), fluoridated salt (180-200 mg F/Kg, n = 26), and fluoridated milk (0.25 mg F, n = 25). A control population was included (no systemic fluoride, n = 24). Fluoride intake from diet and dentifrice, urinary fluoride excretion, and fluoride concentrations in fingernails/toenails were evaluated. Fluoride was analyzed with an ion-selective electrode. Urinary fluoride excretion in the control community was significantly lower when compared with that in the fluoridated cities, except for the naturally fluoridated community. However, the same pattern was not as evident for nails. Both urinary fluoride output and fluoride concentrations in fingernails/toenails were significantly correlated to total fluoride intake. However, the correlation coefficients for fluoride intake and urinary fluoride output were lower (r = 0.28, p < 0.01) than those observed for fingernails/toenails (r = 0.36, p < 0.001), suggesting that nails might be slightly better indicators of fluoride intake at the individual level.
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Affiliation(s)
- M A R Buzalaf
- Department of Biological Sciences, Bauru Dental School, University of São Paulo, Al. Octávio Pinheiro Brisolla, 9-75, Bauru-SP, 17012-901, Brazil.
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Kato MT, Leite AL, Hannas AR, Oliveira RC, Pereira JC, Tjäderhane L, Buzalaf MAR. Effect of iron on matrix metalloproteinase inhibition and on the prevention of dentine erosion. Caries Res 2010; 44:309-16. [PMID: 20551644 DOI: 10.1159/000315932] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2010] [Accepted: 04/15/2010] [Indexed: 11/19/2022] Open
Abstract
It is known that some metal salts can inhibit matrix metalloproteinase (MMP) activity, but the effect of iron has not been tested yet. On the other hand, it has recently been suggested that MMP inhibition might influence dentine erosion. Based on this, the aims of this study were: (1) to test in vitro the effect of FeSO(4) on MMP-2 and -9 activity, and (2) to evaluate in situ the effect of FeSO(4) gel on dentine erosion. MMP-2 and -9 activities were analysed zymographically in buffers containing FeSO(4) in concentrations ranging between 0.05 and 1.5 mmol/l or not. Volunteers (n = 10) wore devices containing bovine dentine blocks (n = 60) previously treated with the following gel treatments: FeSO(4) (1 mmol/l FeSO(4)), F (NaF 1.23%; positive control) and placebo (negative control). The gels were applied once and removed after 1 min. Erosion was performed extraorally with Coca-Cola 4 times per day for 5 min over 5 days. Dentine wear was evaluated by profilometry. The data were analysed by Kruskal-Wallis and Dunn's tests (p < 0.05). FeSO(4) inhibited both MMP-2 (IC(50) = 0.75 mmol/l) and MMP-9 (IC(50) = 0.50 mmol/l) activities. In the in situ experiment, the mean wear (+/- SD) found for the F gel (0.79 +/- 0.08 microm) was significantly reduced in more than 50% when compared to the placebo gel (1.77 +/- 0.33 microm), but the FeSO(4) gel completely inhibited the wear (0.05 +/- 0.02 mum). Since FeSO(4) was able to inhibit MMP in vitro, it is possible that the prevention of dentine wear by the FeSO(4) gel in situ might be due to MMP inhibition, which should be investigated in further studies.
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Affiliation(s)
- M T Kato
- Department of Biological Sciences, Bauru School of Dentistry, University of São Paulo, Bauru, Brazil
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Abstract
Matrix metalloproteinase (MMP) inhibition has been shown to reduce dentin caries progression, but its role in dental erosion has not yet been assessed. This study tested the hypothesis that gels containing MMP inhibitors (epigallocatechin gallate-EGCG and chlorhexidine) can prevent dental erosion. Volunteers (n = 10) wore palatal devices containing bovine dentin blocks (n = 10/group) treated for 1 min with EGCG at 10 (EGCG10) or 400 microM (EGCG400), chlorhexidine at 0.012%, F at 1.23% (NaF), and no vehicle (placebo). Erosion was performed with Coca-Cola (5 min) 4X/day during 5 days. The wear, assessed by profilometry (mean +/- SD, microm), was significantly reduced by the gels containing MMP inhibitors (0.05 +/- 0.02(a), 0.04 +/- 0.02(a), and 0.05 +/- 0.02(a) for EGCG10, EGCG400, and chlorhexidine, respectively) when compared with NaF (0.79 +/- 0.35(b)) and placebo gels (1.77 +/- 0.35(b)) (Friedman and Dunn's tests, p < 0.01). The use of gels delivering MMP inhibitors was shown to prevent erosion and opens a new perspective for protection against dental erosion.
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Affiliation(s)
- M T Kato
- Bauru Dental School, University of São Paulo, Department of Biological Sciences, Al. Octávio Pinheiro Brisolla, 9-75, Bauru-SP 17012-901, Brazil
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Abstract
A/J and 129P3/J mouse strains have different susceptibilities to dental fluorosis, due to their genetic backgrounds. This study tested whether these differences are due to variations in water intake and/or F metabolism. A/J (susceptible to dental fluorosis) and 129P3/J mice (resistant) received drinking water containing 0, 10, or 50 ppm F. Weekly F intake, excretion and retention, and terminal plasma and femur F levels were determined. Dental fluorosis was evaluated clinically and by quantitative fluorescence (QF). Data were tested by two-way ANOVA. Although F intakes by the strains were similar, excretion by A/J mice was significantly higher due to greater urinary F excretion, which resulted in lower plasma and femur F levels. Compared with 129P3/J mice given 50 ppm F, significantly higher QF scores were recorded for A/J mice. In conclusion, these strains differ with respect to several features of F metabolism, and amelogenesis in the 129P3/J strain seems to be unaffected by high F exposure.
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Affiliation(s)
- J G Carvalho
- Department of Biological Sciences, Bauru Dental School, University of São Paulo, Al. Octávio Pinheiro Brisolla, 9-75, Bauru-SP 17012-901, São Paulo, Brazil.
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Buzalaf MAR, Salvadori DMF, Marques MEA, Caroselli EE, Leite AL, Camargo EA, Ribeiro DA. Absence of DNA damage in multiple organs after oral exposure to fluoride in Wistar rats. Bull Environ Contam Toxicol 2006; 77:700-6. [PMID: 17176997 DOI: 10.1007/s00128-006-1119-3] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/14/2006] [Accepted: 10/10/2006] [Indexed: 05/13/2023]
Affiliation(s)
- M A R Buzalaf
- Department of Biological Sciences, Laboratory of Biochemistry, Bauru School of Dentistry, USP, SP, Brazil
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