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Sousa FB, Perea-Causin R, Hartmann S, Lafetá L, Rosa B, Brem S, Palekar C, Reitzenstein S, Hartschuh A, Malic E, Malard LM. Ultrafast hot electron-hole plasma photoluminescence in two-dimensional semiconductors. Nanoscale 2023; 15:7154-7163. [PMID: 37009757 DOI: 10.1039/d2nr06732c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/19/2023]
Abstract
The transition metal dichalcogenide family of semiconducting two-dimensional materials has recently shown a prominent potential to be an ideal platform to study the exciton Mott transition into electron-hole plasma and liquid phases due to their strong Coulomb interactions. Here, we show that pulsed laser excitation at high pump fluences can induce this exciton Mott transition to an electron-hole plasma in mono and few-layer transition metal dichalcogenides at room temperature. The formation of an electron-hole plasma leads to a broadband light emission spanning from the near infrared to the visible region. In agreement with our theoretical calculations, the photoluminescence emission at high energies displays an exponential decay that directly reflects the electronic temperature - a characteristic fingerprint of unbound electron-hole pair recombination. Furthermore, two-pulse excitation correlation measurements were performed to study the dynamics of electronic cooling, which shows two decay time components, one of less than 100 fs and a slower component of few ps associated with the electron-phonon and phonon-lattice bath thermalizations, respectively. Our work may shed light on further studies of the exciton Mott transition into other two-dimensional materials and their heterostructures and its applications in nanolasers and other optoelectronic devices.
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Affiliation(s)
- Frederico B Sousa
- Departamento de Física, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais 30123-970, Brazil.
| | - Raül Perea-Causin
- Department of Physics, Chalmers University of Technology, 41296 Gothenburg, Sweden
| | - Sean Hartmann
- Department of Chemistry and Center for NanoScience (CeNS), University of Munich (LMU), Butenandtstraße 5-13, 81377 Munich, Germany
| | - Lucas Lafetá
- Departamento de Física, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais 30123-970, Brazil.
- Department of Chemistry and Center for NanoScience (CeNS), University of Munich (LMU), Butenandtstraße 5-13, 81377 Munich, Germany
| | - Bárbara Rosa
- Institute of Solid State Physics, Technische Universität Berlin, 10623, Berlin, Germany
| | - Samuel Brem
- Department of Physics, Philipps-Universit ät Marburg, 35037 Marburg, Germany
| | - Chirag Palekar
- Institute of Solid State Physics, Technische Universität Berlin, 10623, Berlin, Germany
| | - Stephan Reitzenstein
- Institute of Solid State Physics, Technische Universität Berlin, 10623, Berlin, Germany
| | - Achim Hartschuh
- Department of Chemistry and Center for NanoScience (CeNS), University of Munich (LMU), Butenandtstraße 5-13, 81377 Munich, Germany
| | - Ermin Malic
- Department of Physics, Chalmers University of Technology, 41296 Gothenburg, Sweden
- Department of Physics, Philipps-Universit ät Marburg, 35037 Marburg, Germany
| | - Leandro M Malard
- Departamento de Física, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais 30123-970, Brazil.
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Moreira MA, Silveira VR, Alcantara VO, Sousa FB, Sousa BC. Prior Restorative Procedures to Endodontic Treatment. Cureus 2023; 15:e37106. [PMID: 37153307 PMCID: PMC10158847 DOI: 10.7759/cureus.37106] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/04/2023] [Indexed: 04/07/2023] Open
Abstract
Tooth loss due to fracture and the failure of endodontic treatment (ET) are common situations in teeth with extensive tissue destruction. This is due to the fragility of the remaining dental structure and the difficulty in sealing cavities, which is sometimes associated with the violation of the supracrestal insertion tissue. The previous restoration of marginal ridges or cusps with composite resin (CR) restores their fracture resistance, due to the adhesive characteristics of the restorative material, while also protecting the quality of endodontic treatment through better sealing. However, the protocol adopted in teeth requiring endodontic treatment involves performing the restorative procedure only after the endodontic procedures. The objective of this study was to report a case in which restoration of marginal ridges and/or cusps was performed prior to endodontic treatment, focusing on maintaining the tooth in function without dental fracture. The restoration was performed with an inverted operative sequence before the endodontic treatment. There was a violation of the supracrestal insertion tissue, requiring crown lengthening surgery (CLS) prior to the restorative procedure. Clinical and radiographic evaluations were performed postoperatively at seven days, three, six, and nine months, and five years. Tooth function was maintained without dental fractures or restoration loss. Periradicular space healing occurred with the disappearance of the lesion. Performing the restorative procedure prior to endodontic treatment in teeth with extensive coronal destruction is an alternative technique that facilitates clinical procedures, reduces the likelihood of dental loss due to fracture, and promotes endodontic treatment success.
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Silva DNA, Cruz NTS, Martins AA, M. Silva RC, Almeida HC, Costa HES, Santos KMO, Vieira BR, Sousa FB, Junior FS, Júnior RFA, Guerra GCB, Pirih FQ, Araújo AA, Martins ARLA. “Probiotic
Lactobacillus rhamnosus EM1107
prevents hyperglycemia, alveolar bone loss and inflammation in a rat model of diabetes and periodontitis”. J Periodontol 2022; 94:376-388. [PMID: 36322996 DOI: 10.1002/jper.22-0262] [Citation(s) in RCA: 6] [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: 04/27/2022] [Revised: 08/04/2022] [Accepted: 09/20/2022] [Indexed: 11/06/2022]
Abstract
BACKGROUND This study evaluated the antihyperglycemic, anti-bone-resorptive, and anti-inflammatory efficacy of the probiotic Lactobacillus rhamnosus EM1107 in an experimental model of ligature-induced periodontitis in diabetic rats treated with metformin (Met). METHODS A total of 114 male Wistar rats was randomly divided into six groups: (1) control, (2) experimental periodontitis (EP), (3) EP + diabetes mellitus (DM), (4) EP + probiotic (Prob), (5) EP + DM + Prob, and (6) EP + DM + Prob + Met. The animals received probiotic gavage during the 30 days of the experiment. DM was induced on the 14th day of the experiment with a single injection of streptozotocin into the penile vein, followed by ligature for EP induction and Met gavage on the 19th day and euthanasia on the 30th day. Heart blood, gingival and periodontal tissue, and hemimaxillae were collected. Biomolecular analysis, immunoenzymatic assays, histomorphology, and microtomographic analysis were performed. Data were statistically analyzed (p < 0.05). RESULTS There was a significant reduction in interleukin-1β (IL-1β) and tumor necrosis factor-α (TNF-α) in the Prob groups (p < 0.05) as well as in blood glucose levels in the Prob and Met groups (p < 0.001). In addition, histomorphological analysis revealed that the Prob groups had a reduction in inflammatory infiltrate. Tartrate-resistant acid phosphatase (TRAP) and microtomographic analyses showed that the EP/DM/Prob/Met group had significantly lower linear and volumetric bone loss than those who had no treatment (p < 0.01). SOD and GPx immunostaining decreased in all groups receiving probiotics. CONCLUSION The findings suggest the immunoinflammatory efficacy of the probiotic L. rhamnosus EM1107 administered either alone or in association with Met in type 1 DM associated with periodontitis.
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Affiliation(s)
- Davi N. A. Silva
- Section of Periodontics, School of Dentistry, University of California UCLA Los Angeles CA United States of America
| | - Natália T. S. Cruz
- Department of Dentistry Federal University of Rio Grande do Norte ‐ UFRN Natal Rio Grande do Norte Brazil
| | - Agnes A. Martins
- Department of Dentistry Federal University of Rio Grande do Norte ‐ UFRN Natal Rio Grande do Norte Brazil
| | - Régia C. M. Silva
- Department of Dentistry Federal University of Rio Grande do Norte ‐ UFRN Natal Rio Grande do Norte Brazil
| | - Hursula C. Almeida
- Department of Dentistry Federal University of Rio Grande do Norte ‐ UFRN Natal Rio Grande do Norte Brazil
| | - Heloísa E. S. Costa
- Department of Dentistry Federal University of Rio Grande do Norte ‐ UFRN Natal Rio Grande do Norte Brazil
| | | | - Basílio R. Vieira
- Department of Morphology Federal University of Paraíba – UFPB João Pessoa Paraíba Brazil
| | - Frederico B. Sousa
- Department of Morphology Federal University of Paraíba – UFPB João Pessoa Paraíba Brazil
| | - Francisco S. Junior
- Departament of Pharmacy Federal University of Rio Grande do Norte ‐ UFRN Natal Rio Grande do Norte Brazil
| | - Raimundo F. A. Júnior
- Department of Morphology Federal University of Rio Grande do Norte ‐ UFRN Natal Rio Grande do Norte Brazil
| | - Gerlane C. B. Guerra
- Department of Biophysics and Pharmacology Federal University of Rio Grande do Norte ‐ UFRN Natal Rio Grande do Norte Brazil
| | - Flavia Q. Pirih
- Section of Periodontics, School of Dentistry, University of California UCLA Los Angeles CA United States of America
| | - Aurigena A. Araújo
- Department of Biophysics and Pharmacology Federal University of Rio Grande do Norte ‐ UFRN Natal Rio Grande do Norte Brazil
| | - Ana R. L. A. Martins
- Department of Dentistry Federal University of Rio Grande do Norte ‐ UFRN Natal Rio Grande do Norte Brazil
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Santos MAFM, Silva DN, Rovaris K, Sousa FB, Dantas ELA, Loureiro LA, Pereira TMC, Meyrelles SS, Bertollo RM, Vasquez EC. Optimal Parameters of Laser Therapy to Improve Critical Calvarial Defects. Front Physiol 2022; 13:841146. [PMID: 35283760 PMCID: PMC8914104 DOI: 10.3389/fphys.2022.841146] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2021] [Accepted: 01/21/2022] [Indexed: 02/04/2023] Open
Abstract
Body bones play diverse pivotal roles, including the protection of vital organs. For instance, the integrative functions of the brain controlling diverse peripheral actions can be affected by a traumatic injury on the calvaria and the reparative process of a large defect is a challenge in the integrative physiology. Therefore, the development of biomaterials and approaches to improve such defects still requires substantial advances. In this regard, the most attractive approaches have been covering the cavity with inorganic bovine bone (IBB) and, more recently, also using low-level laser therapy (LT), but this issue has opened many questions. Here, it was determined the number of LT sessions required to speed up and to intensify the recovery process of two 5-mm-diameter defects promoted in the calvaria of each subgroup of six adult Wistar rats. The quantitative data showed that 30 days post-surgery, the recovery process by using blood clot-filling was not significantly influenced by the number of LT sessions. However, in the IBB-filled defects, the number of LT sessions markedly contributed to the improvement of the reparative process. Compared to the Control group (non-irradiated), the percentage of mineralization (formation of new bone into the cavities) gradually increased 25, 49, and 52% with, respectively, 4, 7, and 11 sessions of LT. In summary, combining the use of IBB with seven sessions of LT seems to be an optimal approach to greatly improve the recovery of calvarial defects. This translational research opens new avenues targeting better conditions of life for those suffering from large bone traumas and in the present field could contribute to preserve the integrative functions of the brain.
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Affiliation(s)
- Matheus AFM Santos
- Dentistry Graduate Program, Federal University of Espirito Santo, UFES, Vitoria, Brazil
| | - Daniela N. Silva
- Dentistry Graduate Program, Federal University of Espirito Santo, UFES, Vitoria, Brazil
| | - Karla Rovaris
- Department of Pathology & Clinical Dentistry, Federal University of Piaui, Teresina, Brazil
| | - Frederico B. Sousa
- Department of Morphology, Federal University of Paraiba, UFPB, Joao Pessoa, Brazil
| | | | - Lucas A. Loureiro
- Pharmaceutical Sciences Graduate Program, Vila Velha University, Vila Velha, Brazil
| | - Thiago M. C. Pereira
- Pharmaceutical Sciences Graduate Program, Vila Velha University, Vila Velha, Brazil
| | - Silvana S. Meyrelles
- Dentistry Graduate Program, Federal University of Espirito Santo, UFES, Vitoria, Brazil
| | - Rossiene M. Bertollo
- Dentistry Graduate Program, Federal University of Espirito Santo, UFES, Vitoria, Brazil
| | - Elisardo C. Vasquez
- Pharmaceutical Sciences Graduate Program, Vila Velha University, Vila Velha, Brazil
- *Correspondence: Elisardo C. Vasquez,
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Bennion DM, Jones CH, Donnangelo LL, Graham JT, Isenberg JD, Dang AN, Rodriguez V, Sinisterra RDM, Sousa FB, Santos RAS, Sumners C. Neuroprotection by post-stroke administration of an oral formulation of angiotensin-(1-7) in ischaemic stroke. Exp Physiol 2019; 103:916-923. [PMID: 29663576 DOI: 10.1113/ep086957] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [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: 02/09/2018] [Accepted: 04/09/2018] [Indexed: 01/04/2023]
Abstract
NEW FINDINGS What is the central question of this study? Angiotensin-(1-7) decreases cerebral infarct volume and improves neurological function when delivered centrally before and during ischaemic stroke. Here, we assessed the neuroprotective effects of angiotensin-(1-7) when delivered orally post-stroke. What is the main finding and its importance? We show that oral delivery of angiotensin-(1-7) attenuates cerebral damage induced by middle cerebral artery occlusion in rats, without affecting blood pressure or cerebral blood flow. Importantly, these treatments begin post-stroke at times coincident with the treatment window for tissue plasminogen activator, providing supporting evidence for clinical translation of this new therapeutic strategy. ABSTRACT As a target for stroke therapies, the angiotensin-converting enzyme 2-angiotensin-(1-7)-Mas [ACE2/Ang-(1-7)/Mas] axis of the renin-angiotensin system can be activated chronically to induce neuroprotective effects, in opposition to the deleterious effects of angiotensin II via its type 1 receptor. However, more clinically relevant treatment protocols with Ang-(1-7) that involve its systemic administration beginning after the onset of ischaemia have not been tested. In this study, we tested systemic post-stroke treatments using a molecule where Ang-(1-7) is included within hydroxypropyl-β-cyclodextrin [HPβCD-Ang-(1-7)] as an orally bioavailable treatment. In three separate protocols, HPβCD-Ang-(1-7) was administered orally to Sprague-Dawley rats after induction of ischaemic stroke by endothelin-1-induced middle cerebral artery occlusion: (i) to assess its effects on cerebral damage and behavioural deficits; (ii) to determine its effects on cardiovascular parameters; and (iii) to determine whether it altered cerebral blood flow. The results indicate that post-stroke oral administration of HPβCD-Ang-(1-7) resulted in 25% reductions in cerebral infarct volumes and improvement in neurological functions (P < 0.05), without inducing any alterations in blood pressure, heart rate or cerebral blood flow. In conclusion, Ang-(1-7) treatment using an oral formulation after the onset of ischaemia induces significant neuroprotection in stroke and might represent a viable approach for taking advantage of the protective ACE2/Ang-(1-7)/Mas axis in this disease.
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Affiliation(s)
- Douglas M Bennion
- Department of Physiology and Functional Genomics, College of Medicine, University of Florida, Gainesville, FL, USA
| | - Chad H Jones
- Department of Physiology and Functional Genomics, College of Medicine, University of Florida, Gainesville, FL, USA
| | - Lauren L Donnangelo
- Department of Physiology and Functional Genomics, College of Medicine, University of Florida, Gainesville, FL, USA
| | - Justin T Graham
- Department of Physiology and Functional Genomics, College of Medicine, University of Florida, Gainesville, FL, USA
| | - Jacob D Isenberg
- Department of Physiology and Functional Genomics, College of Medicine, University of Florida, Gainesville, FL, USA
| | - Alex N Dang
- Department of Physiology and Functional Genomics, College of Medicine, University of Florida, Gainesville, FL, USA
| | - Vermali Rodriguez
- Department of Physiology and Functional Genomics, College of Medicine, University of Florida, Gainesville, FL, USA
| | - Ruben D M Sinisterra
- Department of Chemistry, Institute of Exact Sciences, Federal University of Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
| | - Frederico B Sousa
- Physics and Chemistry Institute, Federal University of Itajubá, Minas Gerais, Brazil
| | - Robson A S Santos
- Department of Physiology and Biophysics, Institute of Biological Sciences, Federal University of Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
| | - Colin Sumners
- Department of Physiology and Functional Genomics, College of Medicine, University of Florida, Gainesville, FL, USA
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Rocha JCB, Silva EF, Oliveira MF, Sousa FB, Teixeira AVNC, Rocha MS. β-Cyclodextrin polymer binding to DNA: Modulating the physicochemical parameters. Phys Rev E 2017; 95:052416. [PMID: 28618573 DOI: 10.1103/physreve.95.052416] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2017] [Indexed: 11/07/2022]
Abstract
Cyclodextrins and cyclodextrins-modified molecules have interesting and appealing properties due to their capacity to host components that are normally insoluble or poorly soluble in water. In this work, we investigate the interaction of a β-cyclodextrin polymer (poly-β-CD) with λ-DNA. The polymers are obtained by the reaction of β-CD with epichlorohydrin in alkaline conditions. We have used optical tweezers to characterize the changes of the mechanical properties of DNA molecules by increasing the concentration of poly-β-CD in the sample. The physical chemistry of the interaction is then deduced from these measurements by using a recently developed quenched-disorder statistical model. It is shown that the contour length of the DNA does not change in the whole range of poly-β-CD concentration (<300μM). On the other hand, significant alterations were observed in the persistence length that identifies two binding modes corresponding to the clustering of ∼2.6 and ∼14 polymer molecules along the DNA double helix, depending on the polymer concentration. Comparing these results with the ones obtained for monomeric β-CD, it was observed that the concentration of CD that alters the DNA persistence length is considerably smaller when in the polymeric form. Also, the binding constant of the polymer-DNA interaction is three orders of magnitude higher than the one found for native (monomeric) β-CD. These results show that the polymerization of the β-CD strongly increases its binding affinity to the DNA molecule. This property can be wisely used to modulate the binding of cyclodextrins to the DNA double helix.
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Affiliation(s)
- J C B Rocha
- Departamento de Física, Universidade Federal de Viçosa, 36570-900 Viçosa, MG, Brazil.,Instituto Federal do Norte de Minas Gerais-Campus Avançado Janaúba, 39440-000 Janaúba, MG, Brazil
| | - E F Silva
- Departamento de Física, Universidade Federal de Viçosa, 36570-900 Viçosa, MG, Brazil
| | - M F Oliveira
- Departamento de Química, Universidade Federal de Minas Gerais, 31270-901 Belo Horizonte, MG, Brazil
| | - F B Sousa
- Instituto de Física e Química, Universidade Federal de Itajubá, 37500-903 Itajubá, MG, Brazil
| | - A V N C Teixeira
- Departamento de Física, Universidade Federal de Viçosa, 36570-900 Viçosa, MG, Brazil
| | - M S Rocha
- Departamento de Física, Universidade Federal de Viçosa, 36570-900 Viçosa, MG, Brazil
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7
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Chaves FN, Bezerra TMM, de Barros Silva PG, Oliveira FAF, Sousa FB, Costa FWG, Alves APNN, Pereira KMA. Evaluation of the p-AKT, p-JNK and FoxO3a function in oral epithelial dysplasia. Oral Dis 2017; 23:367-378. [DOI: 10.1111/odi.12623] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2016] [Revised: 11/06/2016] [Accepted: 12/02/2016] [Indexed: 12/27/2022]
Affiliation(s)
- FN Chaves
- School of Dentistry; Federal University of Ceara/Sobral; Sobral Ceara Brazil
| | - TMM Bezerra
- Division of Oral Pathology; Department of Dental Clinic; Faculty of Pharmacy, Dentistry and Nursing; Federal University of Ceara; Fortaleza Ceara Brazil
| | - PG de Barros Silva
- Division of Oral Pathology; Department of Dental Clinic; Faculty of Pharmacy, Dentistry and Nursing; Federal University of Ceara; Fortaleza Ceara Brazil
| | - FAF Oliveira
- Division of Oral Pathology; Department of Dental Clinic; Faculty of Pharmacy, Dentistry and Nursing; Federal University of Ceara; Fortaleza Ceara Brazil
| | - FB Sousa
- Division of Oral Pathology; Department of Dental Clinic; Faculty of Pharmacy, Dentistry and Nursing; Federal University of Ceara; Fortaleza Ceara Brazil
| | - FWG Costa
- Division of Oral Pathology; Department of Dental Clinic; Faculty of Pharmacy, Dentistry and Nursing; Federal University of Ceara; Fortaleza Ceara Brazil
| | - APNN Alves
- Division of Oral Pathology; Department of Dental Clinic; Faculty of Pharmacy, Dentistry and Nursing; Federal University of Ceara; Fortaleza Ceara Brazil
| | - KMA Pereira
- School of Dentistry; Federal University of Ceara/Sobral; Sobral Ceara Brazil
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de Barros Silva PG, Verde MEQL, Brizeno LAC, Wong DVT, Lima Júnior RCP, Sousa FB, Mota MRL, Alves APNN. Immune cell profile of dental pulp tissue treated with zoledronic acid. Int Endod J 2017; 50:1067-1076. [PMID: 27977859 DOI: 10.1111/iej.12734] [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: 03/14/2016] [Accepted: 12/07/2016] [Indexed: 02/02/2023]
Abstract
AIM To characterize the pulp immune cell profile in the teeth of rats treated with zoledronic acid (ZA). METHODOLOGY Male Wistar rats (n = 6 per group) received four intravenous infusions of ZA at doses of 0.04, 0.20 or 1.00 mg kg-1 ZA or saline (control). On the 70th experimental day, they were euthanized. The first right molar was examined microscopically and submitted to toluidine blue reaction and immunohistochemical for CD68, tumour necrosis Factor (TNF)-α, interleukin (IL)-1β, inducible nitric oxide synthase (iNOS), nuclear factor kappa B (NF-kB) and IL-18 binding protein (IL-18 bp). The presence of ectasic/dilated vessels and inflammatory cells was analysed, and mast cells and mononuclear CD68-positive cells were counted along with the intensity of immunostaining (0-3) for inflammatory markers in odontoblasts and nonodontoblasts pulp cells. The Kruskal-Wallis/Dunn's test (scores or quantitative data) and the chi-squared test (categorical data) were used (GraphPad Prism 5.0, P < 0.05). RESULTS There was no differences in the number of animals exhibiting dilated/ectasic blood vessels (P = 0.242) and inflammatory cells (P = 0.489) or in the number of mast cells (P = 1.000). However, there was an increase in mononuclear CD68-positive cells (P = 0.026), immunostaining of TNF-α (P = 0.020), IL-1β (P = 0.027) and iNOS (P = 0.001) in odontoblasts, and IL-1β (P = 0.013) in nonodontoblast pulp cells dose-dependently. NFkB (nucleus and cytoplasm) and IL-18 bp did not differ between groups. CONCLUSION ZA modified the immune cell profile in the dental pulp, increasing the number of macrophages and expression of pro-inflammatory markers independent of NFkB.
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Affiliation(s)
- P G de Barros Silva
- Department of Dental Clinic, Division of Oral Pathology, Faculty of Pharmacy, Dentistry and Nursing, Federal University of Ceara, Fortaleza, Ceara, Brazil
| | - M E Q L Verde
- Department of Dental Clinic, Division of Oral Pathology, Faculty of Pharmacy, Dentistry and Nursing, Federal University of Ceara, Fortaleza, Ceara, Brazil
| | - L A C Brizeno
- Department of Biotechnology, Faculty of Biotechnology, Federal University of Ceara, Fortaleza, Ceara, Brazil
| | - D V T Wong
- Department of Physiology and Pharmacology, Faculty of Medicine, Federal University of Ceara, Fortaleza, Ceara, Brazil
| | - R C P Lima Júnior
- Department of Physiology and Pharmacology, Faculty of Medicine, Federal University of Ceara, Fortaleza, Ceara, Brazil
| | - F B Sousa
- Department of Dental Clinic, Division of Oral Pathology, Faculty of Pharmacy, Dentistry and Nursing, Federal University of Ceara, Fortaleza, Ceara, Brazil
| | - M R L Mota
- Department of Dental Clinic, Division of Oral Pathology, Faculty of Pharmacy, Dentistry and Nursing, Federal University of Ceara, Fortaleza, Ceara, Brazil
| | - A P N N Alves
- Department of Dental Clinic, Division of Oral Pathology, Faculty of Pharmacy, Dentistry and Nursing, Federal University of Ceara, Fortaleza, Ceara, Brazil
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Koenen J, Oliveira M, Hamamoto D, Santos SH, Sinisterra R, Sousa FB, Oliveira Junior AR, Foscolo R, Santos RA. Abstract P309: Safety, Tolerability and Pharmacokinetic Data of the Novel Orally Active Formulation of Angiotensin- (1-7), Hydroxypropyl-β-cyclodextrin/ Ang- (1-7), in Healthy Volunteers- A Randomized Double-blinded Controlled Pilot Study. Hypertension 2016. [DOI: 10.1161/hyp.68.suppl_1.p309] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [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]
Abstract
Angiotensin-(1-7) is an endogenous peptide of the renin-angiotensin system in humans. It has several properties, which make it of great interest for healthcare, such as in systemic/ pulmonary hypertension treatment, insulin resistance improvement, reduction of visceral obesity and cardiac remodeling and arrhythmias. In this randomized double-blinded controlled phase I study we aimed to determine safety, tolerability, and pharmacokinetic properties of the new drug, angiotensin-(1-7) included in Hydroxypropyl β-cyclodextrin [Ang(1-7)/HPβCD)] in healthy adult volunteers, who were recruited in accordance to inclusion and exclusion criteria. Thirty-two volunteers ( 18-40 years-old ) were admitted to a hospital clinical research ward and remained under observation for two days, during which they received a single oral dose of Ang(1-7)HPβCD (equivalent to 0.35, 1.75 or 7.0 mg of the peptide) or placebo (N=8/ group). Vital signs and side effects were recorded according to the study protocol and blood samples were collected to obtain the pharmacokinetic profile of Ang-(1-7using LC/MS/MS. The oral administration of the novel compound Ang-(1-7)/HPβCD caused a dose-dependent elevation in the Ang-(1-7) plasma levels with a Tmax of 6.5±0.6 hours. The medians of the area under the curve for the placebo, 0.35, 1.75 and 7.0 mg doses were (in pg/mL/24 hours): 837.5±139.8 , 1094.4±224.3, 1415.0±187.7 and 1719.4±304.9, respectively. The Cmax for the 0.35, 1.75 and 7.0 mg doses were 26.1±3.17 pg/mL, 30.7±4.18pg/mL and 44.1±7.42 pg/mL, respectively. We did not find any statistically significant differences among the clinical and laboratorial parameters before and after the study. There were few mild side effects reported in the study, not related to the dose: two volunteers reported headache (one in the placebo group and one in the 0,35mg group) and three had dizziness and sweating in the orthostatic position (one in the 0.35 and two in the 1.75mg group). Our data show that the novel Ang-(1-7)/HPβCD formulation allow the absorption of Ang-(1-7), and is safe and well tolerated. Our results open new perspectives for future clinical trials with Ang-(1-7)/HPβCD for the treatment of arterial hypertension and other conditions.
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10
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de Barros Silva PG, de Oliveira CC, Brizeno L, Wong D, Lima Júnior R, Gonçalves RP, Sousa FB, Mota M, de Albuquerque Ribeiro R, Alves A. Immune cellular profile of bisphosphonate-related osteonecrosis of the jaw. Oral Dis 2016; 22:649-57. [PMID: 27232600 DOI: 10.1111/odi.12513] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [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: 01/18/2016] [Revised: 04/09/2016] [Accepted: 05/02/2016] [Indexed: 01/19/2023]
Abstract
OBJECTIVES Characterize the cell profile and immunostaining of proinflammatory markers in an experimental model of bisphosphonate-related osteonecrosis of the jaw (BRONJ). MATERIALS AND METHODS Male Wistar rats (n = 6-7) were treated chronically with saline solution or zoledronic acid (ZA) at 0.04, 0.20, and 1.00 mg kg(-1) (1.4 × 10(-7) , 6.9 × 10(-6) , and 3.4 × 10(-5) mol kg(-1) ), and subsequently, the first left inferior molar was extracted. Were performed counting of viable and empty osteocyte lacunae, viable and apoptotic osteoclasts, polymorphonuclear neutrophil, mast cells (toluidine blue), and the positive presence cells for CD68, tumor necrosis factor-alpha (TNF-α), IL (interleukin)-1β, inducible nitric oxide synthase (iNOS), nuclear factor-kappa B (NF-kB) and IL-18 binding protein (IL-18 bp). RESULTS BRONJ was showed in ZA treated with 0.20 and 1.00 mg kg(-1) . There is a dose dependent increase in percentage of empty osteocyte lacunae (P < 0.001) and apoptotic osteoclasts (P < 0.001), counting of total osteoclasts (P = 0.003), polymorphonuclear neutrophil cells (P = 0.009), cytoplasmic-positive cells of CD68 (P < 0.001), TNF-α (P = 0.001), IL-1β (P = 0.001), iNOS (P < 0.001), NF-kB (P = 0.006), and nuclear-positive cells of NF-kB (P = 0.011). Consequently, there is no difference in mast cells (P = 0.957), and IL-18 bp immunostaining decreases dose dependently (P = 0.005). CONCLUSIONS BRONJ is characterized by increases in immunostaining for proinflammatory markers and NF-kB and inversely associated with cells exhibiting IL-18 bp.
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Affiliation(s)
- P G de Barros Silva
- Department of Dental Clinic, Division of Oral Pathology, Faculty of Pharmacy, Dentistry and Nursing, Federal University of Ceara, Fortaleza, Ceara, Brazil.
| | - C C de Oliveira
- Department of Dental Clinic, Division of Oral Pathology, Faculty of Pharmacy, Dentistry and Nursing, Federal University of Ceara, Fortaleza, Ceara, Brazil
| | - Lac Brizeno
- Department of Biotechnology, Faculty of Biotechnology, Federal University of Ceara, Fortaleza, Ceara, Brazil
| | - Dvt Wong
- Department of Physiology and Pharmacology, Faculty of Medicine, Federal University of Ceara, Fortaleza, Ceara, Brazil
| | - Rcp Lima Júnior
- Department of Physiology and Pharmacology, Faculty of Medicine, Federal University of Ceara, Fortaleza, Ceara, Brazil
| | - R P Gonçalves
- Department of Clinical Analysis, Faculty of Pharmacy, Dentistry and Nursing, Federal University of Ceara, Fortaleza, Ceara, Brazil
| | - F B Sousa
- Department of Dental Clinic, Division of Oral Pathology, Faculty of Pharmacy, Dentistry and Nursing, Federal University of Ceara, Fortaleza, Ceara, Brazil
| | - Mrl Mota
- Department of Dental Clinic, Division of Oral Pathology, Faculty of Pharmacy, Dentistry and Nursing, Federal University of Ceara, Fortaleza, Ceara, Brazil
| | - R de Albuquerque Ribeiro
- Department of Physiology and Pharmacology, Faculty of Medicine, Federal University of Ceara, Fortaleza, Ceara, Brazil
| | - Apnn Alves
- Department of Dental Clinic, Division of Oral Pathology, Faculty of Pharmacy, Dentistry and Nursing, Federal University of Ceara, Fortaleza, Ceara, Brazil
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11
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Abstract
The ability to infiltrate various molecules and resins into dental enamel is highly desirable in dentistry, yet transporting materials into dental enamel is limited by the nanometric scale of their pores. Materials that cannot be infiltrated into enamel by diffusion/capillarity are often considered molecules with sizes above a critical threshold, which are often considered to be larger than the pores of enamel. We challenge this notion by reporting the use of electrokinetic flow to transport solutions with molecules with sizes above a critical threshold-namely, an aqueous solution with a high refractive index (Thoulet's solution) and a curable fluid resin infiltrant (without acid etching)-deep into the normal enamel layer. Volume infiltration by Thoulet's solution is increased by 5- to 6-fold, and resin infiltration depths as large as 600 to 2,000 µm were achieved, in contrast to ~10 µm resulting from diffusion/capillarity. Incubation with demineralization solution for 192 h resulted in significant demineralization at noninfiltrated histologic points but not at resin infiltrated. These results open new avenues for the transport of materials in dental enamel.
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Affiliation(s)
- H Y Gan
- Singapore Institute of Technology, Singapore Institute of Manufacturing Technology, Singapore Department of Electrical Engineering and Computer Science / Department of Biological Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - F B Sousa
- Department of Morphology, Health Sciences Center, Federal University of Paraiba, Joao Pessoa, Cidade Universitaria, Paraíba, Brazil
| | - H L Carlo
- Department of Restorative Dentistry, Health Sciences Center, Federal University of Paraiba, Joao Pessoa, Cidade Universitaria, Paraíba, Brazil
| | - P P Maciel
- Department of Restorative Dentistry, Health Sciences Center, Federal University of Paraiba, Joao Pessoa, Cidade Universitaria, Paraíba, Brazil
| | - M S Macena
- Department of Morphology, Health Sciences Center, Federal University of Paraiba, Joao Pessoa, Cidade Universitaria, Paraíba, Brazil
| | - J Han
- Department of Electrical Engineering and Computer Science / Department of Biological Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA
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12
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Oliveira Andrade JM, Paraíso AF, Garcia ZM, Ferreira AVM, Sinisterra RDM, Sousa FB, Guimarães ALS, de Paula AMB, Campagnole-Santos MJ, dos Santos RA, Santos SHS. Cross talk between angiotensin-(1-7)/Mas axis and sirtuins in adipose tissue and metabolism of high-fat feed mice. Peptides 2014; 55:158-65. [PMID: 24642355 DOI: 10.1016/j.peptides.2014.03.006] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/07/2014] [Revised: 02/28/2014] [Accepted: 03/09/2014] [Indexed: 02/07/2023]
Abstract
Angiotensin-(1-7) and resveratrol have been described as new potential therapeutic tools on treating and preventing metabolic disorders. In the present study we aimed to evaluate the effect of an oral formulation of angiotensin-(1-7) [Ang-(1-7)] included in HPB-cyclodextrin and resveratrol (RSV), in modulation of sirtuin and renin-angiotensin system (RAS) in adipose tissue of mice treated with a high-fat diet (HFD). We observed that HFD+Ang-(1-7) and HFD+RSV groups presented marked decrease in the adipose tissue mass. Furthermore, these animals showed improved insulin-sensitivity and glucose tolerance as well as lower plasma levels of fasting glucose and lipids. The RT-PCR analysis revealed decreased expression of ACE and an increase of ACE2 [Ang-(1-7) marker] in group treated with resveratrol and also an increased expression of SIRT1 in groups that received Ang-(1-7). We showed for the first time that improved metabolic profile is associated with increased expression of GLUT4 and high expression of AMPK/FOXO1/PPAR-γ pathway in adipose-tissue. Finally, adipocyte primary cell-culture incubated with and without sirtuin and Ang-(1-7)/Mas antagonists pointed out for a cross-talking between RAS and sirtuins. We conclude that oral administration of Ang-(1-7) and RSV improved metabolic profile through a cross-modulation between RAS and Sirtuins.
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Affiliation(s)
- João Marcus Oliveira Andrade
- Laboratory of Health Science, Postgraduate Program in Health Sciences, Universidade Estadual de Montes Claros, Montes Claros, Minas Gerais, Brazil
| | - Alanna Fernandes Paraíso
- Laboratory of Health Science, Postgraduate Program in Health Sciences, Universidade Estadual de Montes Claros, Montes Claros, Minas Gerais, Brazil
| | - Zélia Menezes Garcia
- Laboratory of Microbiology, Postgraduate Program in Microbiology, Universidade Federal de Minas Gerais, Minas Gerais, Brazil
| | | | - Ruben D M Sinisterra
- Department of Chemistry, Universidade Federal de Minas Gerais, Minas Gerais, Brazil
| | - Frederico B Sousa
- Department of Chemistry, Universidade Federal de Minas Gerais, Minas Gerais, Brazil
| | - André Luiz Sena Guimarães
- Laboratory of Health Science, Postgraduate Program in Health Sciences, Universidade Estadual de Montes Claros, Montes Claros, Minas Gerais, Brazil; Department of Dentistry, Universidade Estadual de Montes Claros, Montes Claros, Minas Gerais, Brazil
| | - Alfredo Maurício Batista de Paula
- Laboratory of Health Science, Postgraduate Program in Health Sciences, Universidade Estadual de Montes Claros, Montes Claros, Minas Gerais, Brazil; Department of Dentistry, Universidade Estadual de Montes Claros, Montes Claros, Minas Gerais, Brazil
| | - Maria José Campagnole-Santos
- Institute of Biological Sciences, Department of Pharmacology, Universidade Federal de Minas Gerais, Minas Gerais, Brazil
| | - Robson Augusto dos Santos
- Institute of Biological Sciences, Department of Pharmacology, Universidade Federal de Minas Gerais, Minas Gerais, Brazil
| | - Sérgio Henrique Sousa Santos
- Laboratory of Health Science, Postgraduate Program in Health Sciences, Universidade Estadual de Montes Claros, Montes Claros, Minas Gerais, Brazil; Institute of Biological Sciences, Department of Pharmacology, Universidade Federal de Minas Gerais, Minas Gerais, Brazil; Department of Physiology and Biophysics, Universidade Federal de Minas Gerais, Minas Gerais, Brazil.
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13
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Silva PGB, Cavalcante GM, Fernandes CP, Sousa FB, Mota MRL, Alves APNN. Clinic-pathological Study and Comparative Analysis of Orofacial Lesions in a Brazilian Population of Children and Adolescents. Pesqui bras odontopediatria clín integr 2014. [DOI: 10.4034/pboci.2014.142.10] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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14
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Santos SHS, Andrade JMO, Fernandes LR, Sinisterra RDM, Sousa FB, Feltenberger JD, Alvarez-Leite JI, Santos RAS. Oral Angiotensin-(1-7) prevented obesity and hepatic inflammation by inhibition of resistin/TLR4/MAPK/NF-κB in rats fed with high-fat diet. Peptides 2013; 46:47-52. [PMID: 23714175 DOI: 10.1016/j.peptides.2013.05.010] [Citation(s) in RCA: 103] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/19/2013] [Revised: 05/16/2013] [Accepted: 05/18/2013] [Indexed: 12/16/2022]
Abstract
Obesity is characterized by a pro-inflammatory state commonly associated with type 2 diabetes and fat-liver disease. In the last few years, different studies pointed out the role of Angiotensin (Ang)-(1-7) in the metabolic regulation. The aim of the present study was to evaluate the effect of oral-administration of Ang-(1-7) in metabolism and inflammatory state of high-fat feed rats. Twenty-four male Sprague Dawley rats were randomized into three groups: High Fat Diet (HFD); Standard Diet (ST); High Fat Diet+Angiotensin-(1-7) [HFD+Ang-(1-7)]. Glycemic profile was evaluated by glucose tolerance and insulin sensitivity tests, plasmatic glucose and insulin. Cholesterol, HDL and triglycerides analyses presented lipidic profile. RT-PCR evaluated mRNA expression to ACE, ACE2, resistin, TLR4, IL-6, TNF-α and NF-κB genes. The main results showed that oral Ang-(1-7) decreased body weight and abdominal fat-mass. In addition, HFD+Ang-(1-7) treated rats presented enhanced glucose tolerance, insulin-sensitivity and decreased plasma-insulin levels, as well as a significant decrease in circulating lipid levels. These alterations were accompanied by a marked decreased expression of resistin, TLR4, ACE and increased ACE2 expression in liver. Furthermore, Ang-(1-7) decreases phosphorylation of MAPK and increases NF-κB expression. These alterations diminished expression of interleukin-6 and TNF-α, ameliorate inflammatory state in liver. In summary, the present study showed that oral-treatment with Ang-(1-7) in high-fat feed rats improved metabolism down-regulating resistin/TLR4/NF-κB-pathway.
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Affiliation(s)
- Sérgio Henrique Sousa Santos
- Laboratory of Health Science, Postgraduate Program in Health Sciences, Universidade Estadual de Montes Claros-UNIMONTES, Montes Claros, MG, Brazil.
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15
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Feltenberger JD, Andrade JMO, Paraíso A, Barros LO, Filho ABM, Sinisterra RDM, Sousa FB, Guimarães ALS, de Paula AMB, Campagnole-Santos MJ, Qureshi M, dos Santos RAS, Santos SHS. Oral formulation of angiotensin-(1-7) improves lipid metabolism and prevents high-fat diet-induced hepatic steatosis and inflammation in mice. Hypertension 2013; 62:324-30. [PMID: 23753417 DOI: 10.1161/hypertensionaha.111.00919] [Citation(s) in RCA: 76] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Angiotensin (Ang)-(1-7) has been described as an important tool on treating and preventing metabolic disorders. In this study, we aimed to evaluate the effect of an oral formulation of Ang-(1-7) included in hydroxypropylβ-cyclodextrin (HPβCD/Ang-[1-7]) on hepatic function, steatosis, and on liver inflammatory markers expression in mice treated with a high-fat diet. Male FVB/N mice were divided into 4 groups and fed for 60 days, with each group receiving 1 of the following diets: standard diet+HPβCD, standard diet+Ang-(1-7)/HPβCD, high-fat diet+HPβCD, or high-fat diet+Ang-[1-7]/HPβCD. Body weight, food intake, and blood parameters, such as total cholesterol, triglyceride, alaninetransaminases, and aspartate transaminases, were evaluated. Immunohistochemical analyses were performed for inflammatory markers tumor necrosis factor-α and interleukin-6. Expression of angiotensin converting enzyme, angiotensin-converting enzyme-2, interleukin-1β, tumor necrosis factor-α, interleukin-6, transforming growth factor-β, acetyl-CoA carboxylase, carbohydrate-responsive element-binding protein, peroxisome proliferator-activated receptor-γ, and sterol regulatory element-binding proteins-1c was evaluated by quantitative real-time polymerase chain reaction. The major findings of our study included reduced liver fat mass and weight, decreased plasma total cholesterol, triglyceride, and alaninetransaminase enzyme levels in the oral Ang-(1-7)-treated groups compared with the control groups. These results were accompanied by a significant reduction in tumor necrosis factor-α and interleukin-6 mRNA expression in the liver. Analyses of liver adipogenesis-related genes by quantitative real-time polymerase chain reaction showed that acetyl-CoA carboxylase, peroxisome proliferator-activated receptor-γ, and sterol regulatory element-binding proteins-1c mRNA expression were significantly suppressed. In conclusion, we observed that treatment with Ang-(1-7) improved metabolism and decreased proinflammatory profile and fat deposition in liver of mice.
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Affiliation(s)
- John David Feltenberger
- Department of Pharmacology, Universidade Federal de Minas Gerais, Av Antonio Carlos 6627-ICB, 31270-901, Belo Horizonte, MG, Brazil
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16
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Marques FD, Ferreira AJ, Sinisterra RDM, Jacoby BA, Sousa FB, Caliari MV, Silva GAB, Melo MB, Nadu AP, Souza LE, Irigoyen MCC, Almeida AP, Santos RAS. An oral formulation of angiotensin-(1-7) produces cardioprotective effects in infarcted and isoproterenol-treated rats. Hypertension 2011; 57:477-83. [PMID: 21282558 DOI: 10.1161/hypertensionaha.110.167346] [Citation(s) in RCA: 101] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
In this study we evaluated the cardiac effects of a pharmaceutical formulation developed by including angiotensin (Ang)-(1-7) in hydroxypropyl β-cyclodextrin (HPβCD), in normal, infarcted, and isoproterenol-treated rats. Myocardial infarction was produced by left coronary artery occlusion. Isoproterenol (2 mg/kg, IP) was administered daily for 7 days. Oral administration of HPβCD/Ang-(1-7) started immediately before infarction or associated with the first dose of isoproterenol. After 7 days of treatment, the rats were euthanized, and the Langendorff technique was used to analyze cardiac function. In addition, heart function was chronically (15, 30, 50 days) analyzed by echocardiography. Cardiac sections were stained with hematoxylin/eosin and Masson trichrome to evaluate cardiac hypertrophy and damage, respectively. Pharmacokinetic studies showed that oral HPβCD/Ang-(1-7) administration significantly increased Ang-(1-7) on plasma whereas with the free peptide it was without effect. Oral administration of HPβCD/Ang-(1-7) (30 μg/kg) significantly reduced the deleterious effects induced by myocardial infarction on systolic and diastolic tension, ±dT/dt, perfusion pressure, and heart rate. Strikingly, a 50% reduction of the infarcted area was observed in HPβCD/Ang-(1-7)-treated rats. Furthermore, HPβCD/Ang-(1-7) attenuated the heart function impairment and cardiac remodeling induced by isoproterenol. In infarcted rats chronically treated with HPβCD/Ang-(1-7), the reduction of ejection fraction and fractional shorting and the increase in systolic and diastolic left ventricular volumes observed in infarcted rats were attenuated. Altogether, these findings further confirm the cardioprotective effects of Ang-(1-7). More importantly, our data indicate that the HPβCD/Ang-(1-7) is a feasible formulation for oral administration of Ang-(1-7), which can be used as a cardioprotective drug.
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Affiliation(s)
- Fúlvia D Marques
- Department of Physiology and Biophysics, National Institute of Science and Technology in Nanobiopharmaceutics, Federal University of Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
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17
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Magalhaes DP, Osterne RL, Alves AP, Santos PS, Lima RB, Sousa FB. Multiple brown tumours of tertiary hyperparathyroidism in a renal transplant recipient: A case report. Med Oral Patol Oral Cir Bucal 2009. [DOI: 10.4317/medoral.15.e10] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
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18
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Sousa FB, Vianna SS, Santos-Magalhães NS. A new approach for improving the birefringence analysis of dental enamel mineral content using polarizing microscopy. J Microsc 2006; 221:79-83. [PMID: 16499547 DOI: 10.1111/j.1365-2818.2006.01547.x] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The main problem in interpreting birefringence of dental enamel under polarizing microscopy is the lack of physical constants able to allow the Wiener equation to be applied directly to the composition of such tissue. The present study introduces a new approach to circumvent this constraint. Because the nonmineral phase of enamel is heterogeneous, its refractive index can be computed in terms of its components (namely, water, which is partially replaced by the immersion medium, and organic matter), thereby providing a more acceptable refractive index to be used in the Wiener equation. Furthermore, the enamel mineral volume is ordinarily calculated on the basis of the density 3.15 g cm(-3). The density 2.99 g cm(-3) has been, however, reported to be more accurate for enamel hydroxyapatite, so enamel mineral volumes from selected published data were converted using such a density. The birefringence of mature enamel computed by the Wiener equation, taking into account the above refinements, matched, for the first time, published experimental birefringence values. The theoretical water and organic contents were also consistent with published experimental data. Thus, a direct application of the Wiener equation to the enamel composition has now been achieved. It is speculated that quantitative data on the mineral, the water and the organic contents of mature dental enamel can be derived from interpretation of birefringence in two immersion media (obtained before and after extraction of the organic matter) with this new approach.
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Affiliation(s)
- F B Sousa
- Departamento de Morfologia, Centro de Ciências da Saude, Universidade Federal da Paraiba, Cidade Universitaria, 58051-900, Joao Pessoa, Paraiba, Brazil.
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