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Fiama das Neves Ortiz S, Verdan R, Rocha GM, Miranda K, Benchimol M. The parabasal filaments of Trichomonas vaginalis: A new filament and observations using 0.8 nm-resolution scanning electron microscopy. J Struct Biol X 2024; 9:100099. [PMID: 38487378 PMCID: PMC10937234 DOI: 10.1016/j.yjsbx.2024.100099] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [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: 02/28/2024] [Accepted: 03/04/2024] [Indexed: 03/17/2024] Open
Abstract
Trichomonas vaginalis is the etiologic agent of trichomoniasis, the most common nonviral sexually transmitted infection worldwide, with an estimated 260 million new cases annually. T. vaginalis contains organelles common to all eukaryotic cells, uncommon cell structures such as hydrogenosomes, and a complex and elaborate cytoskeleton constituting the mastigont system. The mastigont system is mainly formed by several proteinaceous structures associated with basal bodies, the pelta-axostylar complex made of microtubules, and striated filaments named the costa and the parabasal filaments (PFs). Although the structural organization of trichomonad cytoskeletons has been analyzed using several techniques, observation using a new generation of scanning electron microscopes with a resolution exceeding 1 nm has allowed more detailed visualization of the three-dimensional organization of the mastigont system. In this study, we have investigated the cytoskeleton of T. vaginalis using a diverse range of scanning probe microscopy techniques, which were complemented by electron tomography and Fast-Fourier methods. This multi-modal approach has allowed us to characterize an unknown parabasal filament and reveal the ultrastructure of other striated fibers that have not been published before. Here, we show the differences in origin, striation pattern, size, localization, and additional details of the PFs, thus improving the knowledge of the cell biology of this parasite.
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Affiliation(s)
- Sharmila Fiama das Neves Ortiz
- Laboratório de Ultraestrutura Celular Hertha Meyer, Instituto de Biofísica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Raphael Verdan
- Laboratório de Ultraestrutura Celular Hertha Meyer, Instituto de Biofísica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Gustavo Miranda Rocha
- Unidade de Pesquisa Urogenital, Centro Biomédico, Departamento de Anatomia, Universidade Estadual do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Kildare Miranda
- Laboratório de Ultraestrutura Celular Hertha Meyer, Instituto de Biofísica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
- CENABIO - Centro Nacional de Biologia Estrutural e Bioimagem, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brazil
- Instituto Nacional de Ciência e Tecnologia em Biologia Estrutural e Bioimagem – Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
- Centro Multiusuário para Análise de Fenômenos Biomédicos, Universidade do Estado do Amazonas, Manaus, Brazil
| | - Marlene Benchimol
- CENABIO - Centro Nacional de Biologia Estrutural e Bioimagem, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brazil
- Instituto Nacional de Ciência e Tecnologia em Biologia Estrutural e Bioimagem – Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
- UNIGRANRIO-Universidade da Grande Rio, Rio de Janeiro, Brazil
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Leite KLDF, Martins ML, Monteiro ASN, Vieira TI, Alexandria AK, Rocha GM, Fonseca-Gonçalves A, Pithon MM, Cavalcanti YW, Maia LC. In-vitro effect of a single application of CPP-ACP pastes and different fluoridated solutions on the prevention of dental caries around orthodontic brackets. Dental Press J Orthod 2024; 28:e2321383. [PMID: 38198388 PMCID: PMC10773443 DOI: 10.1590/2177-6709.28.6.e2321383.oar] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [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] [Received: 03/16/2021] [Accepted: 11/26/2023] [Indexed: 01/12/2024] Open
Abstract
OBJECTIVE To assess the in-vitro effect of single applications of CPP-ACP pastes and different fluoridated solutions on the prevention of dental caries around orthodontic brackets. MATERIAL AND METHODS Tooth/bracket sets (n=65) were immersed in artificial saliva (1h at 37ºC) and randomly subjected to single applications (100µL; 1min) of casein phosphopeptide-amorphous calcium phosphate (CPP-ACP emulsion), CPP-ACP with fluoride (CPP-ACPF emulsion), solutions of titanium tetrafluoride (TiF4) or sodium fluoride (NaF), or no treatment (CG). Multispecies biofilm (5 x 105 CFU/mL) was formed in the presence of 2% sucrose. After 24 h, the pH and the concentration of total soluble fluoride (TSF) were analyzed by culture medium. The presence of active white spot lesions (WSL) evaluated by macroscopic examination and the percent surface mineral loss (%SML) were analyzed. Also, the topography of enamel was detected by analysis of scanning electron microscopy (SEM). The data was assessed by chi-square, Kruskal-Wallis, and Mann-Whitney tests (p < 0.05). RESULTS Fluoride-containing compounds led to a smaller pH reduction than did CPP-ACP and CG (p<0.05). There was difference in TSF between the groups (p<0.05), denoted as TiF4> NaF > CPP-ACPF > CPP-ACP > CG. Regarding the presence of WSL and %SML, the NaF group obtained lower values (p<0.05), while TiF4 and CPP-ACPF were similar (p>0.05). SEM demonstrated that fluoride-free groups had a larger surface dissolution. CONCLUSION Fluoridated groups including solutions and CPP-ACPF were more effective than CPP-ACP in reducing enamel demineralization around orthodontic brackets after a single application.
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Affiliation(s)
- Karla Lorene de França Leite
- Universidade Federal do Rio de Janeiro, Faculdade de Odontologia, Departamento de Odontopediatria e Ortodontia (Rio de Janeiro/RJ, Brazil)
| | - Mariana Leonel Martins
- Universidade Federal do Rio de Janeiro, Faculdade de Odontologia, Departamento de Odontopediatria e Ortodontia (Rio de Janeiro/RJ, Brazil)
| | - Amanda Souza Nunes Monteiro
- Universidade Federal do Rio de Janeiro, Faculdade de Odontologia, Departamento de Odontopediatria e Ortodontia (Rio de Janeiro/RJ, Brazil)
| | - Thiago Isidro Vieira
- Universidade Federal do Rio de Janeiro, Faculdade de Odontologia, Departamento de Odontopediatria e Ortodontia (Rio de Janeiro/RJ, Brazil)
| | - Adílis Kalina Alexandria
- Universidade Federal do Rio de Janeiro, Faculdade de Odontologia, Departamento de Odontopediatria e Ortodontia (Rio de Janeiro/RJ, Brazil)
| | - Gustavo Miranda Rocha
- Universidade Federal do Rio de Janeiro, Instituto de Biofísica Carlos Chagas Filho (Rio de Janeiro/RJ, Brazil)
| | - Andréa Fonseca-Gonçalves
- Universidade Federal do Rio de Janeiro, Faculdade de Odontologia, Departamento de Odontopediatria e Ortodontia (Rio de Janeiro/RJ, Brazil)
| | - Matheus Melo Pithon
- Universidade Estadual do Sudoeste da Bahia, Departamento de Saúde (Jequié/BA, Brazil)
| | - Yuri Wanderley Cavalcanti
- Universidade Federal da Paraíba, Departamento de Odontologia Clínica e Social (João Pessoa/PB, Brazil)
| | - Lucianne Cople Maia
- Universidade Federal do Rio de Janeiro, Faculdade de Odontologia, Departamento de Odontopediatria e Ortodontia (Rio de Janeiro/RJ, Brazil)
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Souza-Melo N, de Lima Alcantara C, Vidal JC, Rocha GM, de Souza W. Implications of Flagellar Attachment Zone Proteins TcGP72 and TcFLA-1BP in Morphology, Proliferation, and Intracellular Dynamics in Trypanosoma cruzi. Pathogens 2023; 12:1367. [PMID: 38003831 PMCID: PMC10675206 DOI: 10.3390/pathogens12111367] [Citation(s) in RCA: 0] [Impact Index Per Article: 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: 10/16/2023] [Revised: 11/05/2023] [Accepted: 11/10/2023] [Indexed: 11/26/2023] Open
Abstract
The highly adaptable parasite Trypanosoma cruzi undergoes complex developmental stages to exploit host organisms effectively. Each stage involves the expression of specific proteins and precise intracellular structural organization. These morphological changes depend on key structures that control intracellular components' growth and redistribution. In trypanosomatids, the flagellar attachment zone (FAZ) connects the flagellum to the cell body and plays a pivotal role in cell expansion and structural rearrangement. While FAZ proteins are well-studied in other trypanosomatids, there is limited knowledge about specific components, organization, and function in T. cruzi. This study employed the CRISPR/Cas9 system to label endogenous genes and conduct deletions to characterize FAZ-specific proteins during epimastigote cell division and metacyclogenesis. In T. cruzi, these proteins exhibited distinct organization compared to their counterparts in T. brucei. TcGP72 is anchored to the flagellar membrane, while TcFLA-1BP is anchored to the membrane lining the cell body. We identified unique features in the organization and function of the FAZ in T. cruzi compared to other trypanosomatids. Deleting these proteins had varying effects on intracellular structures, cytokinesis, and metacyclogenesis. This study reveals specific variations that directly impact the success of cell division and differentiation of this parasite.
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Affiliation(s)
- Normanda Souza-Melo
- Laboratório de Ultraestrutura Celular Hertha Meyer, Centro de Pesquisas em Medicina de Precisão, Instituto de Biofísica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro, Rio de Janeiro 21491-590, Brazil; (C.d.L.A.); (J.C.V.); (G.M.R.)
| | - Carolina de Lima Alcantara
- Laboratório de Ultraestrutura Celular Hertha Meyer, Centro de Pesquisas em Medicina de Precisão, Instituto de Biofísica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro, Rio de Janeiro 21491-590, Brazil; (C.d.L.A.); (J.C.V.); (G.M.R.)
| | - Juliana Cunha Vidal
- Laboratório de Ultraestrutura Celular Hertha Meyer, Centro de Pesquisas em Medicina de Precisão, Instituto de Biofísica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro, Rio de Janeiro 21491-590, Brazil; (C.d.L.A.); (J.C.V.); (G.M.R.)
| | - Gustavo Miranda Rocha
- Laboratório de Ultraestrutura Celular Hertha Meyer, Centro de Pesquisas em Medicina de Precisão, Instituto de Biofísica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro, Rio de Janeiro 21491-590, Brazil; (C.d.L.A.); (J.C.V.); (G.M.R.)
| | - Wanderley de Souza
- Laboratório de Ultraestrutura Celular Hertha Meyer, Centro de Pesquisas em Medicina de Precisão, Instituto de Biofísica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro, Rio de Janeiro 21491-590, Brazil; (C.d.L.A.); (J.C.V.); (G.M.R.)
- Centro de Estudos Biomédicos-CMABio, Escola Superior de Saúde, Universidade do Estado do Amazonas-UEA, Manaus 69065-000, Brazil
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de Carvalho RT, Rocha GM, Karez CS, da Gama Bahia R, Pereira RC, Bastos AC, Salgado LT. Global assessment of coralline algae mineralogy points to high vulnerability of Southwestern Atlantic reefs and rhodolith beds to ocean acidification. Sci Rep 2022; 12:9589. [PMID: 35688967 PMCID: PMC9187768 DOI: 10.1038/s41598-022-13731-y] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2022] [Accepted: 05/12/2022] [Indexed: 11/09/2022] Open
Abstract
Coralline algae constitute one of the main groups of highly vulnerable calcified benthic organisms to ocean acidification. Although damaging effects of seawater acidification on the coralline algae skeleton have been widely demonstrated, the susceptibility to dissolution varies according to the Mg2+ in the calcite lattice. Even though the Southwest Atlantic Ocean exhibits the world's largest rhodolith beds, which occupies 20,902 km2, there is no information regarding the coralline algae species mineralogy in this area. Here, we provide mineralogical data of twenty-four coralline algae species, examine the similarity in taxonomic groups, spatial occurrence and the vulnerability of these algae to seawater acidification. Mineralogy revealed that coralline algae skeletons were mainly composed of high-Mg calcite (> 70%) with minor presence of aragonite (< 30%) and dolomite (< 3%). There were no similarities between the skeletal mineralogy of taxonomic groups and sampling regions. Remarkably, the mean Mg-substitution of encrusting coralline algae from the Brazilian Shelf was 46.3% higher than global average. Because of the higher mean Mg-substitution in calcite compared with worldwide coralline algae, these algae from Southwest Atlantic Ocean would be highly susceptible to dissolution caused by the expected near-future ocean acidification and will compromise CaCO3 net production across the Brazilian Shelf.
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Affiliation(s)
- Rodrigo Tomazetto de Carvalho
- Instituto de Pesquisas Jardim Botânico do Rio de Janeiro, Rua Pacheco Leão, 915, Jardim Botânico, Rio de Janeiro, RJ, CEP 22460-030, Brazil
| | - Gustavo Miranda Rocha
- Instituto de Biofísica Carlos Chagas Filho, CCS-Centro de Ciências da Saúde, Cidade Universitária, Rio de Janeiro, RJ, 21941-902, Brazil
| | - Claudia Santiago Karez
- Instituto de Pesquisas Jardim Botânico do Rio de Janeiro, Rua Pacheco Leão, 915, Jardim Botânico, Rio de Janeiro, RJ, CEP 22460-030, Brazil
| | - Ricardo da Gama Bahia
- Instituto de Pesquisas Jardim Botânico do Rio de Janeiro, Rua Pacheco Leão, 915, Jardim Botânico, Rio de Janeiro, RJ, CEP 22460-030, Brazil
| | - Renato Crespo Pereira
- Instituto de Pesquisas Jardim Botânico do Rio de Janeiro, Rua Pacheco Leão, 915, Jardim Botânico, Rio de Janeiro, RJ, CEP 22460-030, Brazil
| | - Alex Cardoso Bastos
- Departamento de Ecologia e Recursos Naturais, Centro de Ciências Humanas e Naturais, Universidade Federal do Espírito Santo, Av. Fernando Ferrari, 514 Goiabeiras, Vitória, ES, CEP 29055-460, Brazil
| | - Leonardo Tavares Salgado
- Instituto de Pesquisas Jardim Botânico do Rio de Janeiro, Rua Pacheco Leão, 915, Jardim Botânico, Rio de Janeiro, RJ, CEP 22460-030, Brazil.
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Rocha GM, Féres JC, Barcelos-Silva P, Sterza JM, Fernandes LFL. First record of Kelleridae in Brazilian waters. A geographical range expansion and a new Kelleria (Gurney, 1927) morphotype. BRAZ J BIOL 2022; 84:e255748. [PMID: 35137849 DOI: 10.1590/1519-6984.255748] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2021] [Accepted: 12/10/2021] [Indexed: 11/22/2022] Open
Affiliation(s)
- G M Rocha
- Universidade Federal do Espírito Santo - UFES, Departamento de Oceanografia e Ecologia, Vitória, ES, Brasil
| | - J C Féres
- Ethica Ambiental Serviços e Consultoria Ltda., Vila Velha, ES, Brasil
| | - P Barcelos-Silva
- Ethica Ambiental Serviços e Consultoria Ltda., Vila Velha, ES, Brasil
| | - J M Sterza
- Ethica Ambiental Serviços e Consultoria Ltda., Vila Velha, ES, Brasil
| | - L F L Fernandes
- Universidade Federal do Espírito Santo - UFES, Departamento de Oceanografia e Ecologia, Vitória, ES, Brasil
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Canto FMT, Alexandria AK, Justino IBDS, Rocha GM, Cabral LM, Ferreira RDS, Pithon MM, Maia LC. The use of a new calcium mesoporous silica nanoparticle versus calcium and/or fluoride products in reducing the progression of dental erosion. J Appl Oral Sci 2020; 28:e20200131. [PMID: 32725049 PMCID: PMC7384487 DOI: 10.1590/1678-7757-2020-0131] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [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: 03/02/2020] [Accepted: 05/19/2020] [Indexed: 01/16/2023] Open
Abstract
Objective There is increasingly common the consumption more times a day of foods and acidic drinks in the diet of the population. The present study aimed to evaluate and compare the effects of a calcium mesoporous silica nanoparticle single application of other calcium and/or fluoride products in reducing the progression of dental erosion. Methodology Half of the eroded area was covered of 60 blocks of enamel, after which the block was submitted to the following treatments: (Ca2+-MSN), casein phosphopeptide–amorphous calcium phosphate (CPP-ACP); CPP-ACP/F-(900 ppm F−); titanium tetrafluoride (TiF4 1%) (positive control); sodium fluoride (NaF 1.36%) (positive control); and Milli-Q® water (negative control) before being submitted to a second erosive challenge. A surface analysis was performed via a three-dimensional (3D) noncontact optical profilometry to assess the volumetric roughness (Sa) and tooth structure loss (TSL) and and through scanning electron microscopy (MEV). An analysis of variance (ANOVA) and Tukey’s test were performed. Results Regarding Sa, all experimental groups exhibited less roughness than the control (p<0.05). The TSL analysis revealed that the Ca2+-MSN and NaF groups were similar (p>0.05) and more effective in minimizing tooth loss compared with the other groups (p<0.05). Conclusions The Ca2+-MSN and NaF treatments were superior compared with the others and the negative control.
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Affiliation(s)
| | - Adílis Kalina Alexandria
- Departamento de Odontopediatria e Ortodontia, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brasil
| | - Isabela B Dos Santos Justino
- Departamento de Odontopediatria e Ortodontia, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brasil
| | - Gustavo Miranda Rocha
- Departamento de Biofísica, Instituto de Biofísica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brasil
| | - Lúcio Mendes Cabral
- Departamento de Medicamentos, Faculdade de Farmácia, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brasil
| | - Raphael da Silva Ferreira
- Departamento de Medicamentos, Faculdade de Farmácia, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brasil
| | - Matheus Melo Pithon
- Departamento de Odontopediatria e Ortodontia, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brasil
| | - Lucianne Cople Maia
- Departamento de Odontopediatria e Ortodontia, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brasil
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Hochman-Mendez C, Pereira de Campos DB, Pinto RS, Mendes BJDS, Rocha GM, Monnerat G, Weissmuller G, Sampaio LC, Carvalho AB, Taylor DA, de Carvalho ACC. Tissue-engineered human embryonic stem cell-containing cardiac patches: evaluating recellularization of decellularized matrix. J Tissue Eng 2020; 11:2041731420921482. [PMID: 32742631 PMCID: PMC7375712 DOI: 10.1177/2041731420921482] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2019] [Accepted: 03/27/2020] [Indexed: 02/05/2023] Open
Abstract
Decellularized cardiac extracellular matrix scaffolds with preserved composition and architecture can be used in tissue engineering to reproduce the complex cardiac extracellular matrix. However, evaluating the extent of cardiomyocyte repopulation of decellularized cardiac extracellular matrix scaffolds after recellularization attempts is challenging. Here, we describe a unique combination of biochemical, biomechanical, histological, and physiological parameters for quantifying recellularization efficiency of tissue-engineered cardiac patches compared with native cardiac tissue. Human embryonic stem cell-derived cardiomyocytes were seeded into rat heart atrial and ventricular decellularized cardiac extracellular matrix patches. Confocal and atomic force microscopy showed cell integration within the extracellular matrix basement membrane that was accompanied by restoration of native cardiac tissue passive mechanical properties. Multi-electrode array and immunostaining (connexin 43) were used to determine synchronous field potentials with electrical coupling. Myoglobin content (~60%) and sarcomere length measurement (>45% vs 2D culture) were used to evaluate cardiomyocyte maturation of integrated cells. The combination of these techniques allowed us to demonstrate that as cellularization efficiency improves, cardiomyocytes mature and synchronize electrical activity, and tissue mechanical/biochemical properties improve toward those of native tissue.
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Affiliation(s)
- Camila Hochman-Mendez
- Instituto de Biofísica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
- Regenerative Medicine Research, Texas Heart Institute, Houston, TX, USA
| | - Dilza Balteiro Pereira de Campos
- Instituto de Biofísica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
- Regenerative Medicine Research, Texas Heart Institute, Houston, TX, USA
| | - Rafael Serafim Pinto
- Instituto de Biofísica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| | | | - Gustavo Miranda Rocha
- Instituto de Biofísica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Gustavo Monnerat
- Instituto de Biofísica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Gilberto Weissmuller
- Instituto de Biofísica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Luiz C Sampaio
- Regenerative Medicine Research, Texas Heart Institute, Houston, TX, USA
| | - Adriana Bastos Carvalho
- Instituto de Biofísica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
- National Institute of Science and Technology for Regenerative Medicine, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Doris A Taylor
- Regenerative Medicine Research, Texas Heart Institute, Houston, TX, USA
- Doris A Taylor, Regenerative Medicine Research, Texas Heart Institute, 6770 Bertner Avenue, MC 1-135, Houston, TX 77030, USA.
| | - Antonio Carlos Campos de Carvalho
- Instituto de Biofísica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
- National Institute of Science and Technology for Regenerative Medicine, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
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Alencar CDM, Leite KLDF, Ortiz MIG, Magno MB, Rocha GM, Silva CM, Maia LC. Morphological and chemical effects of in-office and at-home desensitising agents containing sodium fluoride on eroded root dentin. Arch Oral Biol 2019; 110:104619. [PMID: 31805483 DOI: 10.1016/j.archoralbio.2019.104619] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [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: 09/21/2019] [Revised: 11/15/2019] [Accepted: 11/15/2019] [Indexed: 11/29/2022]
Abstract
OBJECTIVE The aim of this study was to evaluate the morphological and chemical effect of in-office and at-home desensitising agents containing sodium fluoride (NaF) on eroded root dentine in vitro. METHODS Fifty bovine dentine samples were pre-eroded and randomised into five groups (n = 10): G1 (Control) - milli-Q water; G2 - fluoride varnish containing NaF 22,500 ppm; G3 - desensitising cream containing NaF 9,000 ppm associated with 20% nanohydroxyapatite; G4 - toothpaste with NaF 5,000 ppm associated to tricalcium phosphate; G5 - toothpaste containing NaF 900 ppm and casein phosphopeptide-amorphous calcium phosphate fluoride (CPP-ACPF). The specimens were submitted to erosive challenge for three days. The analyses were performed using non-contact profilometry for volumetric (Sa) and linear roughness (Ra) followed by scanning electron microscopy (SEM) and Energy Dispersive X-ray Spectrometry (EDS). The data were analysed by Kruskal-Wallis and Wilcoxon tests (α = 0.05). RESULTS There was a significant reduction of Ra and Sa for the eroded samples from the G2 and G5 (p < 0.05) after an erosive challenge. The dentine surface topography pattern showed partially or totally occluded dentinal tubules after treatments, except in the control group. The control, G4 and G3 groups showed a reduction in the dentine inorganic content percentage of Ca (Calcium) and P (Phosphorus) minerals. CONCLUSION The fluoride varnish and CPP-ACPF toothpaste were able to prevent morphological changes and were the only materials that showed the Ca and P content increased after treatment. These materials may be promising alternatives in the clinical control of dentin erosion.
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Affiliation(s)
- Cristiane de Melo Alencar
- School of Dentistry, Federal University of Para, Augusto Correa Street, 01, Belém, 66075-110, PA, Brazil.
| | - Karla Lorene de França Leite
- Department of Pediatrics and Orthodontics, School of Dentistry, Federal University of Rio de Janeiro, Av. Pedro Calmon, 550, Cidade Universitária, Rio de Janeiro, 21941-901, RJ, Brazil.
| | | | - Marcela Baraúna Magno
- Department of Pediatrics and Orthodontics, School of Dentistry, Federal University of Rio de Janeiro, Av. Pedro Calmon, 550, Cidade Universitária, Rio de Janeiro, 21941-901, RJ, Brazil.
| | - Gustavo Miranda Rocha
- Institute of Biophysics Carlos Chagas Filho, Center for Health Sciences, Federal University of Rio de Janeiro, Av. Pedro Calmon, 550, Cidade Universitária, Rio de Janeiro, 21941-901, RJ, Brazil.
| | - Cecy Martins Silva
- School of Dentistry, Federal University of Para, Augusto Correa Street, 01, Belém, 66075-110, PA, Brazil.
| | - Lucianne Cople Maia
- Department of Pediatrics and Orthodontics, School of Dentistry, Federal University of Rio de Janeiro, Av. Pedro Calmon, 550, Cidade Universitária, Rio de Janeiro, 21941-901, RJ, Brazil.
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Sorozini M, Dos Reis Perez C, Rocha GM. Enamel sample preparation for AFM: Influence on roughness and morphology. Microsc Res Tech 2018; 81:1071-1076. [PMID: 30295354 DOI: 10.1002/jemt.23073] [Citation(s) in RCA: 7] [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: 11/20/2017] [Revised: 05/08/2018] [Accepted: 05/25/2018] [Indexed: 11/07/2022]
Abstract
Human dental enamel is organized by prisms that are structured between 3 and 6 µm in diameter. Determining the relationships between different treatments on the surface of enamel using ultrastructural analysis is the purpose of many in vitro experiments. Different sample pretreatments have been reported in the literature. Grinding and polishing are common procedures for enamel preparation. They provide a flat and standardized surface, which is imperative for the use of some techniques such as ATR-FTIR. However, for morphological analysis, SEM and AFM represent easier methods to measure and reduce the biological sample variation. Therefore, the objective of this study was to establish how different forms of enamel preparation can influence the advent of artifacts during ultrastructural observation, especially by AFM analysis. Four groups (n = 10) were tested: (a) without preparation; (b) polishing with a diamond paste; (c) grinding with decreasing granulations of silicon carbide papers; (d) grinding with polishing. Images were obtained using the Peak-Force Tapping mode. After the first images were obtained, all fragments were acid etched with 37% phosphoric acid for 30 seconds, rinsed for 60 seconds, and dried intensively. Upon grinding and polishing, the exposure of the inner enamel surfaces provided a less mineralized layer that was marked by scratches and a higher susceptibility to treatments. Moreover, using native enamel provided more valuable information on the surface and the roughness changes for clinical applications. In addition, phosphoric acid is an option for observing the prismatic arrangement after grinding and/or polishing changes the morphology. RESEARCH HIGHLIGHTS: The use of native enamel samples to investigate the effects of different treatments on surface should be preferred in research, when the technique allows it.
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Affiliation(s)
- Marianna Sorozini
- Department of Restorative Dentistry, Faculty of Dentistry of University of Rio de Janeiro State, Rio de Janeiro, Rio de Janeiro, Brazil
| | - Cesar Dos Reis Perez
- Department of Restorative Dentistry, Faculty of Dentistry of University of Rio de Janeiro State, Rio de Janeiro, Rio de Janeiro, Brazil
| | - Gustavo Miranda Rocha
- Department of Biophysics, Biological Physics Laboratory, Biophysics Institute Carlos Chagas Filho, Federal University of Rio de Janeiro, Rio de Janeiro, Rio de Janeiro, Brazil
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Rocha GM, Féres JC, Esteves BS, Sterza JM. First record of the non-native copepod Pseudodiaptomus trihamatus Wright, 1937 (Copepoda, Calanoida) in Rio de Janeiro state, Brazil. BRAZ J BIOL 2018; 79:361-364. [PMID: 30066735 DOI: 10.1590/1519-6984.183672] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2017] [Accepted: 10/27/2017] [Indexed: 11/22/2022] Open
Affiliation(s)
- G M Rocha
- Ethica Ambiental Serviços e Consultoria Ltda., Rua Anésio Alvarenga, 276, Praia da Costa, CEP 29101-230, Vila Velha, ES, Brasil
| | - J C Féres
- Ethica Ambiental Serviços e Consultoria Ltda., Rua Anésio Alvarenga, 276, Praia da Costa, CEP 29101-230, Vila Velha, ES, Brasil
| | - B S Esteves
- Porto do Açu Operações S.A., Fazenda Saco Dantas, s/n, São João da Barra, CEP 28200-000, Rio de Janeiro, RJ, Brasil
| | - J M Sterza
- Ethica Ambiental Serviços e Consultoria Ltda., Rua Anésio Alvarenga, 276, Praia da Costa, CEP 29101-230, Vila Velha, ES, Brasil
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Johnson L, Almeida-da-Silva CLC, Takiya CM, Figliuolo V, Rocha GM, Weissmüller G, Scharfstein J, Coutinho-Silva R, Ojcius DM. Oral infection of mice with Fusobacterium nucleatum results in macrophage recruitment to the dental pulp and bone resorption. Biomed J 2018; 41:184-193. [PMID: 30080658 PMCID: PMC6138822 DOI: 10.1016/j.bj.2018.05.001] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2017] [Revised: 04/01/2018] [Accepted: 05/08/2018] [Indexed: 01/17/2023] Open
Abstract
BACKGROUND Fusobacterium nucleatum is a Gram-negative anaerobic bacterium associated with periodontal disease. Some oral bacteria, like Porphyromonas gingivalis, evade the host immune response by inhibiting inflammation. On the other hand, F. nucleatum triggers inflammasome activation and release of danger-associated molecular patterns (DAMPs) in infected gingival epithelial cells. METHODS In this study, we characterized the pro-inflammatory response to F. nucleatum oral infection in BALB/c mice. Western blots and ELISA were used to measure cytokine and DAMP (HMGB1) levels in the oral cavity after infection. Histology and flow cytometry were used to observe recruitment of immune cells to infected tissue and pathology. RESULTS Our results show increased expression and production of pro-inflammatory cytokines during infection. Furthermore, we observe that F. nucleatum infection leads to recruitment of macrophages in different tissues of the oral cavity. Infection also contributes to osteoclast recruitment, which could be involved in the observed bone resorption. CONCLUSIONS Overall, our findings suggest that F. nucleatum infection rapidly induces inflammation, release of DAMPs, and macrophage infiltration in gingival tissues and suggest that osteoclasts may drive bone resorption at early stages of the inflammatory process.
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Affiliation(s)
- Larry Johnson
- Department of Biomedical Sciences, University of the Pacific, Arthur Dugoni School of Dentistry, San Francisco, CA, USA; Immunobiology Program, Institute of Biophysics Carlos Chagas Filho, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
| | - Cássio Luiz Coutinho Almeida-da-Silva
- Department of Biomedical Sciences, University of the Pacific, Arthur Dugoni School of Dentistry, San Francisco, CA, USA; Immunobiology Program, Institute of Biophysics Carlos Chagas Filho, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
| | - Christina Maeda Takiya
- Immunobiology Program, Institute of Biophysics Carlos Chagas Filho, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
| | - Vanessa Figliuolo
- Immunobiology Program, Institute of Biophysics Carlos Chagas Filho, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
| | - Gustavo Miranda Rocha
- Molecular and Structural Biology Program, Institute of Biophysics Carlos Chagas Filho, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
| | - Gilberto Weissmüller
- Molecular and Structural Biology Program, Institute of Biophysics Carlos Chagas Filho, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
| | - Julio Scharfstein
- Immunobiology Program, Institute of Biophysics Carlos Chagas Filho, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
| | - Robson Coutinho-Silva
- Immunobiology Program, Institute of Biophysics Carlos Chagas Filho, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
| | - David M Ojcius
- Department of Biomedical Sciences, University of the Pacific, Arthur Dugoni School of Dentistry, San Francisco, CA, USA; Immunobiology Program, Institute of Biophysics Carlos Chagas Filho, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil.
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de Carvalho RT, Rocha GM, Paradas WC, Soares AR, Ank Guarino G, Passos RMF, Amado Filho GM, Farina M, Salgado LT. Cell wall physicochemical properties determine the thallus biomineralization pattern of Padina gymnospora (Phaeophyceae). J Phycol 2017; 53:1294-1304. [PMID: 28990189 DOI: 10.1111/jpy.12596] [Citation(s) in RCA: 0] [Impact Index Per Article: 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: 09/20/2016] [Accepted: 08/24/2017] [Indexed: 06/07/2023]
Abstract
Approximately half of the Padina (Dictyotales, Phaeophyceae) species mineralize aragonite needles over the adaxial thallus surface, where mineral bands are interspersed with nonmineralized regions along the thallus from the apical to basal end. However, this calcification pattern and the related algal properties are not well understood. Therefore, this work was performed to elucidate a potential role of cell walls in the inhibition/induction of mineralization in the brown alga Padina gymnospora. In a comparison of specific thallus regions, differences were identified in the cellulose distribution, microfibrils arrangement and thickness, distribution and abundance of phenolic substances, and physical differences among the surfaces of the thallus (deformation, adhesion, topography, and nano-rugosity). In vitro mineralization assays indicated that phenolic substances are strong modulators of calcium carbonate crystals growth. In addition, de novo mineralization assays over cell wall surfaces that were used as templates, even without cellular activity, indicated that the cell wall remains a key factor in the induction/inhibition of mineralization. Overall, the current findings indicate a strong correlation between the physico-chemical and structural properties of the cell wall and the alternation pattern of the mineralization bands over the thallus of P. gymnospora.
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Affiliation(s)
| | - Gustavo Miranda Rocha
- Laboratório de Física Biológica, Instituto de Biofísica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro, Cidade Universitária, Ilha do Fundão, Rio de Janeiro, 21941-902, Brazil
| | - Wladimir Costa Paradas
- Instituto de Pesquisas Jardim Botânico do Rio de Janeiro, Rio de Janeiro, 22460-030, Brazil
| | - Angélica Ribeiro Soares
- Grupo de Produtos Naturais de Organismos Aquáticos (GPNOA), Núcleo em Ecologia e Desenvolvimento Socioambiental de Macaé, Macaé, Rio de Janeiro, 27901-000, Brazil
| | - Gláucia Ank Guarino
- Departamento de Biologia Marinha, Universidade Federal Fluminense, Niterói, Rio de Janeiro, 24001-970, Brazil
| | | | | | - Marcos Farina
- Laboratório de Biomineralização, Instituto de Ciências Biomédicas, Universidade Federal do Rio de Janeiro, Rio de Janeiro, 21941-902, Brazil
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Moro AFV, Ramos AB, Rocha GM, Perez CDR. Effect of prior silane application on the bond strength of a universal adhesive to a lithium disilicate ceramic. J Prosthet Dent 2017; 118:666-671. [PMID: 28385437 DOI: 10.1016/j.prosdent.2016.12.021] [Citation(s) in RCA: 8] [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] [Received: 07/13/2016] [Revised: 12/01/2016] [Accepted: 12/01/2016] [Indexed: 11/18/2022]
Abstract
STATEMENT OF PROBLEM Universal adhesives combine silane and various monomers in a single bottle to make them more versatile. Their adhesive performance is unclear. PURPOSE The purpose of this in vitro study was to assess the effects of an additional silane application before using a universal adhesive on the adhesion between a disilicate glass ceramic and a composite resin by using a microshear bond strength test (μSBS) and fracture analysis immediately and after thermocycling. MATERIAL AND METHODS One hundred lithium disilicate glass ceramic disks were divided into 10 groups for bond strength testing according to the following 3 surface treatments: silane application (built-in universal adhesive or with additional application), adhesive (Adper Single Bond Plus [SB, 3M ESPE], Scotchbond Universal Adhesive [U, 3M ESPE], and mixed U with Dual Cure Activator [DCA, 3M ESPE]); or thermocycling (half of the specimens were thermocycled 10000 times). After surface treatment, 5 resin cylinders were bonded to each disk and submitted to a μSBS test. The failure mode was analyzed under a stereomicroscope and evaluated by scanning electron microscope and energy-dispersive x-ray spectroscopy. Data from the μSBS test were analyzed by 3-way ANOVA followed by the Tukey HSD post hoc test (α=.05). RESULTS An additional silane application resulted in a higher μSBS result for all adhesive groups (P<.05). CONCLUSIONS Ceramic surface treatment influenced the performance of adhesives, which may be improved with an additional silane application.
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Affiliation(s)
| | - Amanda Barreto Ramos
- Doctoral student, Department of Clinical Procedures, Rio de Janeiro State University, Rio de Janeiro, Brazil
| | - Gustavo Miranda Rocha
- Postdoctoral student, Institute of Biophysics Carlos Chagas Filho, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
| | - Cesar Dos Reis Perez
- Associate Professor, Department of Prosthesis, Rio de Janeiro State University, Rio de Janeiro, Brazil
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Ishida K, Cipriano TF, Rocha GM, Weissmüller G, Gomes F, Miranda K, Rozental S. Silver nanoparticle production by the fungus Fusarium oxysporum: nanoparticle characterisation and analysis of antifungal activity against pathogenic yeasts. Mem Inst Oswaldo Cruz 2016; 109:220-8. [PMID: 24714966 PMCID: PMC4015259 DOI: 10.1590/0074-0276130269] [Citation(s) in RCA: 77] [Impact Index Per Article: 9.6] [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: 05/17/2013] [Accepted: 09/16/2013] [Indexed: 12/22/2022] Open
Abstract
The microbial synthesis of nanoparticles is a green chemistry approach that
combines nanotechnology and microbial biotechnology. The aim of this study was
to obtain silver nanoparticles (SNPs) using aqueous extract from the filamentous
fungus Fusarium oxysporum as an alternative to chemical
procedures and to evaluate its antifungal activity. SNPs production increased in
a concentration-dependent way up to 1 mM silver nitrate until 30 days of
reaction. Monodispersed and spherical SNPs were predominantly produced. After 60
days, it was possible to observe degenerated SNPs with in additional needle
morphology. The SNPs showed a high antifungal activity against
Candida and Cryptococcus , with minimum
inhibitory concentration values ≤ 1.68 µg/mL for both genera. Morphological
alterations of Cryptococcus neoformans treated with SNPs were
observed such as disruption of the cell wall and cytoplasmic membrane and lost
of the cytoplasm content. This work revealed that SNPs can be easily produced by
F. oxysporum aqueous extracts and may be a feasible,
low-cost, environmentally friendly method for generating stable and uniformly
sized SNPs. Finally, we have demonstrated that these SNPs are active against
pathogenic fungi, such as Candida and
Cryptococcus .
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Affiliation(s)
- Kelly Ishida
- Laboratório de Quimioterapia Antifúngica, Departamento de Microbiologia, Instituto de Ciências Biomédicas, Universidade de São Paulo, São Paulo, SP, Brasil
| | - Talita Ferreira Cipriano
- Laboratório de Biologia Celular de Fungos, Instituto de Biofísica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro
| | - Gustavo Miranda Rocha
- Laboratório de Física Biológica, Instituto de Biofísica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro
| | - Gilberto Weissmüller
- Laboratório de Física Biológica, Instituto de Biofísica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro
| | - Fabio Gomes
- Instituto Nacional de Metrologia, Padronização e Qualidade Industrial, Duque de Caxias, RJ, Brasil
| | - Kildare Miranda
- Instituto Nacional de Metrologia, Padronização e Qualidade Industrial, Duque de Caxias, RJ, Brasil
| | - Sonia Rozental
- Laboratório de Biologia Celular de Fungos, Instituto de Biofísica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro
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Araújo GRDS, Fontes GN, Leão D, Rocha GM, Pontes B, Sant'Anna C, de Souza W, Frases S. Cryptococcus neoformans capsular polysaccharides form branched and complex filamentous networks viewed by high-resolution microscopy. J Struct Biol 2015; 193:75-82. [PMID: 26655746 DOI: 10.1016/j.jsb.2015.11.010] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [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] [Received: 09/21/2015] [Revised: 11/28/2015] [Accepted: 11/30/2015] [Indexed: 11/17/2022]
Abstract
Cryptococcus neoformans is a fungal pathogen that causes life-threatening infections in immunocompromised individuals. Its main virulence factor is an extracellular polysaccharide capsule whose structure, assembly and dynamics remain poorly understood. In this study, we apply improved protocols for sample preparation and recently-developed scanning microscopy techniques to visualize the ultrastructure of the C. neoformans capsule at high-resolution (up to 1 nm) and improved structural preservation. Although most capsule structures in nature consist of linear polymers, we show here that the C. neoformans capsule is a 'microgel-like' structure composed of branched polysaccharides. Moreover, we imaged the capsule-to-cell wall link, which is formed by thin fibers that branch out of thicker capsule filaments, and have one end firmly embedded in the cell wall structure. Together, our findings provide compelling ultrastructural evidence for a branched and complex capsule conformation, which may have important implications for the biological activity of the capsule as a virulence factor.
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Affiliation(s)
- Glauber R de S Araújo
- Laboratório de Ultraestrutura Celular Hertha Meyer, Instituto de Biofísica Carlos Chagas Filho, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil; National Institute of Metrology, Quality and Technology (Inmetro), Duque de Caxias, Rio de Janeiro, Brazil
| | - Giselle N Fontes
- National Institute of Metrology, Quality and Technology (Inmetro), Duque de Caxias, Rio de Janeiro, Brazil
| | - Daniela Leão
- National Institute of Metrology, Quality and Technology (Inmetro), Duque de Caxias, Rio de Janeiro, Brazil
| | - Gustavo Miranda Rocha
- Laboratório de Ultraestrutura Celular Hertha Meyer, Instituto de Biofísica Carlos Chagas Filho, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
| | - Bruno Pontes
- Laboratório de Pinças Óticas - COPEA, Instituto de Ciências Biomédicas, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
| | - Celso Sant'Anna
- National Institute of Metrology, Quality and Technology (Inmetro), Duque de Caxias, Rio de Janeiro, Brazil
| | - Wanderley de Souza
- Laboratório de Ultraestrutura Celular Hertha Meyer, Instituto de Biofísica Carlos Chagas Filho, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil; National Institute of Metrology, Quality and Technology (Inmetro), Duque de Caxias, Rio de Janeiro, Brazil
| | - Susana Frases
- Laboratório de Ultraestrutura Celular Hertha Meyer, Instituto de Biofísica Carlos Chagas Filho, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil; National Institute of Metrology, Quality and Technology (Inmetro), Duque de Caxias, Rio de Janeiro, Brazil.
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Rocha GM, Teixeira DE, Miranda K, Weissmüller G, Bisch PM, de Souza W. Structural changes of the paraflagellar rod during flagellar beating in Trypanosoma cruzi. PLoS One 2010; 5:e11407. [PMID: 20613980 PMCID: PMC2894934 DOI: 10.1371/journal.pone.0011407] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [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: 03/15/2010] [Accepted: 06/07/2010] [Indexed: 11/28/2022] Open
Abstract
Background Trypanosoma cruzi, the agent of Chagas disease, is a protozoan member of the Kinetoplastidae family characterized for the presence of specific and unique structures that are involved in different cell activities. One of them is the paraflagellar rod (PFR), a complex array of filaments connected to the flagellar axoneme. Although the function played by the PFR is not well established, it has been shown that silencing of the synthesis of its major proteins by either knockout of RNAi impairs and/or modifies the flagellar motility. Methodology/Principal Findings Here, we present results obtained by atomic force microscopy (AFM) and transmission electron microscopy (TEM) of replicas of quick-frozen, freeze-fractured, deep-etched and rotary-replicated cells to obtain detailed information of the PFR structures in regions of the flagellum in straight and in bent state. The images obtained show that the PFR is not a fixed and static structure. The pattern of organization of the PFR filament network differs between regions of the flagellum in a straight state and those in a bent state. Measurements of the distances between the PFR filaments and the filaments that connect the PFR to the axoneme as well as of the angles between the intercrossed filaments supported this idea. Conclusions/Significance Graphic computation based on the information obtained allowed the proposal of an animated model for the PFR structure during flagellar beating and provided a new way of observing PFR filaments during flagellar beating.
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Affiliation(s)
- Gustavo Miranda Rocha
- Laboratório de Ultraestrutura Celular Hertha Meyer, Universidade Federal do Rio de Janeiro, Cidade Universitária, Ilha do Fundão, Rio de Janeiro, Brazil
- Instituto Nacional de Ciência e Tecnologia em Biologia Estrutural e Bioimagens, Universidade Federal do Rio de Janeiro, Cidade Universitária, Ilha do Fundão, Rio de Janeiro, Brazil
- Diretoria de Programa, Instituto Nacional de Metrologia, Normalização e Qualidade Industrial - INMETRO, Duque de Caxias, Rio de Janeiro, Brazil
| | - Dirceu Esdras Teixeira
- Laboratório de Ultraestrutura Celular Hertha Meyer, Universidade Federal do Rio de Janeiro, Cidade Universitária, Ilha do Fundão, Rio de Janeiro, Brazil
| | - Kildare Miranda
- Laboratório de Ultraestrutura Celular Hertha Meyer, Universidade Federal do Rio de Janeiro, Cidade Universitária, Ilha do Fundão, Rio de Janeiro, Brazil
- Instituto Nacional de Ciência e Tecnologia em Biologia Estrutural e Bioimagens, Universidade Federal do Rio de Janeiro, Cidade Universitária, Ilha do Fundão, Rio de Janeiro, Brazil
- Diretoria de Programa, Instituto Nacional de Metrologia, Normalização e Qualidade Industrial - INMETRO, Duque de Caxias, Rio de Janeiro, Brazil
| | - Gilberto Weissmüller
- Instituto Nacional de Ciência e Tecnologia em Biologia Estrutural e Bioimagens, Universidade Federal do Rio de Janeiro, Cidade Universitária, Ilha do Fundão, Rio de Janeiro, Brazil
- Laboratório de Física Biológica, Instituto de Biofísica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro, Cidade Universitária, Ilha do Fundão, Rio de Janeiro, Brazil
| | - Paulo Mascarello Bisch
- Instituto Nacional de Ciência e Tecnologia em Biologia Estrutural e Bioimagens, Universidade Federal do Rio de Janeiro, Cidade Universitária, Ilha do Fundão, Rio de Janeiro, Brazil
- Laboratório de Física Biológica, Instituto de Biofísica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro, Cidade Universitária, Ilha do Fundão, Rio de Janeiro, Brazil
| | - Wanderley de Souza
- Laboratório de Ultraestrutura Celular Hertha Meyer, Universidade Federal do Rio de Janeiro, Cidade Universitária, Ilha do Fundão, Rio de Janeiro, Brazil
- Instituto Nacional de Ciência e Tecnologia em Biologia Estrutural e Bioimagens, Universidade Federal do Rio de Janeiro, Cidade Universitária, Ilha do Fundão, Rio de Janeiro, Brazil
- Diretoria de Programa, Instituto Nacional de Metrologia, Normalização e Qualidade Industrial - INMETRO, Duque de Caxias, Rio de Janeiro, Brazil
- * E-mail:
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Rocha GM, Bianchi RF, Severo M, Rodrigues MM, Baptista MJ, Correia-Pinto J, Guimarães HA. Congenital Diaphragmatic Hernia. The Post-neonatal period. Part II. Eur J Pediatr Surg 2008; 18:307-12. [PMID: 19051398 DOI: 10.1055/s-2008-1038606] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
AIM The aim of the study was to review our experience in the management of newborns with congenital diaphragmatic hernia (CDH). METHODS A retrospective study including all infants with CDH at the Hospital de São João, a center that does not provide ECMO support, for the period from 1997 to 2006. Since 2003, a new treatment protocol has been used. RESULTS There were 61 newborns (30 male/31 female) with a birth weight of 2800 g (880 - 3770), and a gestational age of 38 weeks (28 - 41); 46 (75 %) were inborn and 42 (69 %) had a prenatal diagnosis of CDH. There were 2 (3 %) chromosomal anomalies, 3 (5 %) with other congenital anomalies and 1 (2 %) with nonimmune hydrops fetalis. The diaphragmatic defect was left sided in 55 (90 %) cases. Corrective surgery was performed in 43 (70 %) patients. New therapies were used: HFOV 13 % (n = 8); inhaled nitric oxide 13 % (n = 8); and sildenafil 7 % (n = 4). We found that systemic arterial hypotension (p = 0.001), the severity of pulmonary hypertension (p = 0.001), prenatal diagnosis (p = 0.006), birth weight (p = 0.022), female gender (p = 0.029), inborn birth (p = 0.030), arterial pH < 7.35 at admission (p = 0.030), right-sided defect (p = 0.033) and pneumothorax (p = 0.033) to be predictive of mortality. The overall survival rate was 43 % (n = 26), and since 2003 this rate has improved to 61 % for term neonates without other congenital or chromosomal anomalies. CONCLUSIONS Our survival rate for infants with CDH has improved over the last ten years, and this improvement is associated with the use of new therapies such as HFOV, inhaled nitric oxide and sildenafil.
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Affiliation(s)
- G M Rocha
- Department of Neonatology, Hospital de São João, Porto, Portugal.
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18
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Rocha GM, Bianchi RF, Severo M, Rodrigues MM, Baptista MJ, Correia-Pinto J, Guimarães HA. Congenital diaphragmatic hernia - the neonatal period (part I). Eur J Pediatr Surg 2008; 18:219-23. [PMID: 18704887 DOI: 10.1055/s-2008-1038502] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
AIM The aim of the study was to review our experience in the management of newborns with congenital diaphragmatic hernia (CDH). METHODS A retrospective study including all infants with CDH at the Hospital de São João, a center that does not provide ECMO support, for the period from 1997 to 2006. Since 2003, a new treatment protocol has been used. RESULTS There were 61 newborns (30 male/31 female) with a birth weight of 2800 g (880 - 3770), and a gestational age of 38 weeks (28 - 41); 46 (75 %) were inborn and 42 (69 %) had a prenatal diagnosis of CDH. There were 2 (3 %) chromosomal anomalies, 3 (5 %) with other congenital anomalies and 1 (2 %) with nonimmune hydrops fetalis. The diaphragmatic defect was left sided in 55 (90 %) cases. Corrective surgery was performed in 43 (70 %) patients. New therapies were used: HFOV 13 % (n = 8); inhaled nitric oxide 13 % (n = 8); and sildenafil 7 % (n = 4). We found that systemic arterial hypotension (p = 0.001), the severity of pulmonary hypertension (p = 0.001), prenatal diagnosis (p = 0.006), birth weight (p = 0.022), female gender (p = 0.029), inborn birth (p = 0.030), arterial pH < 7.35 at admission (p = 0.030), right-sided defect (p = 0.033) and pneumothorax (p = 0.033) to be predictive of mortality. The overall survival rate was 43 % (n = 26), and since 2003 this rate has improved to 61 % for term neonates without other congenital or chromosomal anomalies. CONCLUSIONS Our survival rate for infants with CDH has improved over the last ten years, and this improvement is associated with the use of new therapies such as HFOV, inhaled nitric oxide and sildenafil.
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Affiliation(s)
- G M Rocha
- Department of Neonatology, Hospital de São João, Porto, Portugal.
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Rocha GM, Miranda K, Weissmüller G, Bisch PM, de Souza W. Ultrastructure of Trypanosoma cruzi revisited by atomic force microscopy. Microsc Res Tech 2008; 71:133-9. [PMID: 17992694 DOI: 10.1002/jemt.20535] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Most advances in atomic force microscopy (AFM) have been accomplished in recent years. Previous attempts to use AFM to analyze the organization of pathogenic protozoa did not significantly contribute with new structural information. In this work, we introduce a new perspective to the study of the ultrastructure of the epimastigote form of Trypanosoma cruzi by AFM. Images were compared with those obtained using field emission scanning electron microscopy of critical point dried cells and transmission electron microscopy of negative stained detergent-extracted and air-dried cells. AFM images of epimastigote forms showed a flagellum furrow separating the axoneme from the paraflagellar rod (PFR) present from the emergence of the flagellar pocket to the tip of the flagellum. At high magnification, a row of periodically organized structures, which probably correspond to the link between the axoneme, the PFR and the flagellar membrane were seen along the furrow. In the origin of the flagellum, two basal bodies were identified. Beyond the basal bodies, small periodically arranged protrusions, positioned at 400 nm from the flagellar basis were seen. This structure was formed by nine substructures distributed around the flagellar circumference and may correspond to the flagellar necklace. Altogether, our results demonstrate the importance of the application of AFM in the structural characterization of the surface components and cytoskeleton on protozoan parasites.
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Affiliation(s)
- Gustavo Miranda Rocha
- Laboratório de Ultraestrutura Celular Hertha Meyer, Instituto de Biofísica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro, Av. Carlos Chagas Filho s/n, 21941-902, Ilha do Fundão, Rio de Janeiro, RJ, Brazil
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Barroso MMS, Freire E, Limaverde GSC, Rocha GM, Batista EJ, Weissmüller G, Andrade LR, Coelho-Sampaio T. Artificial Laminin Polymers Assembled in Acidic pH Mimic Basement Membrane Organization. J Biol Chem 2008; 283:11714-20. [DOI: 10.1074/jbc.m709301200] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
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Rocha GM, Brandão BA, Mortara RA, Attias M, de Souza W, Carvalho TMU. The flagellar attachment zone of Trypanosoma cruzi epimastigote forms. J Struct Biol 2006; 154:89-99. [PMID: 16414276 DOI: 10.1016/j.jsb.2005.11.008] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2005] [Revised: 11/16/2005] [Accepted: 11/22/2005] [Indexed: 10/25/2022]
Abstract
The flagellar attachment zone (FAZ) is an adhesion region of Trypanosoma cruzi epimastigote forms where the flagellum emerges from the flagellar pocket and remains attached to the cell body. This region shows a junctional complex which is formed by a linear series of apposed macular structures that are separated by amorphous material and clusters of intramembranous particles. Two protein groups appear to be important in the FAZ region: a membrane glycoprotein of 72kDa and several high molecular weight proteins. To gain a better understanding of the FAZ region, we compared wild-type Y strain T. cruzi epimastigotes with a mutant cell in which the 72-kDa surface glycoprotein (Gp72), involved in cell body-flagellum adhesion, had been deleted by target gene replacement. Using immunofluorescence confocal microscopy and electron microscopy techniques to analyze the FAZ region the results suggest that, in the absence of Gp72, other proteins involved in the formation of FAZ remain concentrated in the flagellar pocket region. The analysis of a 3-D reconstruction model of wild-type epimastigotes showed that the endoplasmic reticulum and mitochondrion are in intimate association with FAZ, in contrast to the null mutant cells where the endoplasmic reticulum was not visualized.
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Affiliation(s)
- Gustavo Miranda Rocha
- Laboratório de Ultraestrutura Celular Hertha Meyer, Instituto de Biofísica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro, CCS, Bloco G, llha do Fundão, Rio de Janeiro, RJ 21949-900, Brazil
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22
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Forster AC, Laprega MR, Dal-Fabbro AL, Rocha GM, Dos Santos JS, Yazlle MED, Souzay CSD, Daneluzzi JC. [Methodology of learning in primary care and family medicine]. Aten Primaria 2002; 30:125-9. [PMID: 12106565 PMCID: PMC7679719 DOI: 10.1016/s0212-6567(02)78983-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Affiliation(s)
- A C Forster
- Centro de Atenção Primaria e Saúde da Familia, Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, Brasil.
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23
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Cintra OA, Owa MA, Machado AA, Cervi MC, Figueiredo LT, Rocha GM, Siqueira MM, Arruda E. Occurrence and severity of infections caused by subgroup A and B respiratory syncytial virus in children in southeast Brazil. J Med Virol 2001; 65:408-12. [PMID: 11536252 DOI: 10.1002/jmv.2049] [Citation(s) in RCA: 26] [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: 11/05/2022]
Abstract
The frequency and severity of infections caused by respiratory syncytial virus (RSV) were assessed in children <2 years of age seen at the emergency department. The frequency of RSV detection in the clinical virology laboratory during the past 3 years was also analyzed retrospectively. RSV was found in 21.6% (188/869) of the samples collected from children seen at the emergency department and was found to be more frequent during the autumn, being less frequent or negligible by midwinter. RSV subgroups A and B co-circulated within the same time period in children seen at the emergency department, with varying predominance of either subgroup. There was no significant association of RSV subgroup with disease severity, but only a trend for RSV subgroup B being more frequent in children with risk factors for severe disease.
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Affiliation(s)
- O A Cintra
- Department of Pediatrics, University of São Paulo School of Medicine at Ribeirão Preto, Ribeirão Preto, São Paulo, Brazil.
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24
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Abstract
As part of the urinary concentrating mechanism, renal inner medulla cells may be exposed to extremely variable NaCl and urea concentrations that can reach very high levels. A number of studies, reviewed herein, aim to understand how such osmotic stress affects the cells and what protective mechanisms might exist. The majority of these studies are done on inner medullary epithelial cells that grow continuously in tissue culture (mIMCD3). Cells grown at 300 mosmol/kg survive increase to 500 mosmol/kg by adding NaCl or urea, but only after a growth arrest of approximately 24 h. At a higher osmolality (650-700 mosmol/kg) most cells die within hours by apoptosis. The cells both in vitro and in vivo adapt to high osmolality by a number of mechanisms, including accumulation of variety of organic osmolytes and induction of heat shock proteins. The cell cycle delay results from blocks at the G1 and G2/M checkpoints and slowing during S. After adding NaCl, but not urea, the amount and transcriptional activity of p53 (the tumor suppressor protein) increases. The p53 is phosphorylated on ser-15 and is transcriptionally active at 500 mosmol/kg (associated with cell survival), but not at 700 mosmol/kg (associated with apoptosis). Reduction of p53 expression by p53 antisense oligonucleotide increases sensitivity of renal cells in culture to hyperosmotic stress caused by NaCl. The possible mechanisms of the protection action of p53 against hypertonic stress are discussed.
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Affiliation(s)
- N I Dmitrieva
- Laboratory of Kidney and Electrolyte Metabolism, National Heart, Lung and Blood Institute, Bethesda, MD 20892-1603, USA
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25
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Rocha GM, Michea LF, Peters EM, Kirby M, Xu Y, Ferguson DR, Burg MB. Direct toxicity of nonsteroidal antiinflammatory drugs for renal medullary cells. Proc Natl Acad Sci U S A 2001; 98:5317-22. [PMID: 11320259 PMCID: PMC33207 DOI: 10.1073/pnas.091057698] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.7] [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: 11/18/2022] Open
Abstract
Antipyretic analgesics, taken in large doses over a prolonged period, cause a specific form of kidney disease, characterized by papillary necrosis and interstitial scarring. Epidemiological evidence incriminated mixtures of drugs including aspirin (ASA), phenacetin, and caffeine. The mechanism of toxicity is unclear. We tested the effects of ASA, acetaminophen (APAF, the active metabolite of phenacetin), caffeine, and other related drugs individually and in combination on mouse inner medullary collecting duct cells (mIMCD3). The number of rapidly proliferating cells was reduced by approximately 50% by 0.5 mM ASA, salicylic acid, or APAF. The drugs had less effect on confluent cells, which proliferate slowly. Thus, the slow in vivo turnover of IMCD cells could explain why clinical toxicity requires very high doses of these drugs over a very long period. Caffeine greatly potentiated the effect of acetaminophen, pointing to a potential danger of the mixture. Cyclooxygenase (COX) inhibitors, indomethacin and NS-398, did not reduce cell number except at concentrations greatly in excess of those that inhibit COX. Therefore, COX inhibition alone is not toxic. APAF arrests most cells in late G(1) and S and produces a mixed form of cell death with both oncosis (swollen cells and nuclei) and apoptosis. APAF is known to inhibit the synthesis of DNA and cause chromosomal aberrations due to inhibition of ribonucleotide reductase. Such effects of APAF might account for renal medullary cell death in vivo and development of uroepithelial tumors from surviving cells that have chromosomal aberrations.
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Affiliation(s)
- G M Rocha
- Laboratory of Kidney and Electrolytes Metabolism, National Heart, Lung, and Blood Institute, Bethesda, MD 20892, USA
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26
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Rocha GM. [Nursing education from the point of view of the practical-reflexive teacher]. Servir 2001; 49:56-60. [PMID: 12012547] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/25/2023]
Affiliation(s)
- G M Rocha
- Escola Superior de Enfermagem da Cruz Vermelha Portuguesa
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27
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Rocha GM. [The subject in training. The development of the student/person in the context of the teaching relationship]. Servir 2000; 48:237-40. [PMID: 12035178] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/25/2023]
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28
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Abstract
A direct enantioselective high-performance liquid chromatography method is described for the quantitative determination of praziquantel enantiomers in plasma samples. The method involves two-step extraction of plasma with toluene, evaporation of the solvent and chromatography on a Chiralcel OD-H column using hexane-ethanol (85:15, v/v) as the mobile phase and detection at 220 nm. The assay satisfies all of the criteria required for use in clinical pharmacokinetic studies.
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Affiliation(s)
- V A Jabor
- Faculdade de Ciências Farmacêuticas de Ribeirão Preto-USP, Brazil
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29
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Funayama CA, De F Turcato M, Moura-Ribeiro R, Rocha GM, Pina Neto JM, Moura-Ribeiro MV. Recurrent meningitis in a case of congenital anterior sacral meningocele and agenesis of sacral and coccygeal vertebrae. Arq Neuropsiquiatr 1995; 53:799-801. [PMID: 8729777 DOI: 10.1590/s0004-282x1995000500016] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
A rare case of recurrent meningitis due to congenital anterior sacral meningocele and agenesis of the sacral and coccygeal vertebrae is described. An autosomal dominant inheritance is demonstrated for lower cord malformation, and environmental factors (chromic acid or fumes) are discussed.
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Affiliation(s)
- C A Funayama
- Departamento de Neurologia, Unversidade de São Paulo, Brasil
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30
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Veríssimo A, Vesey G, Rocha GM, Marrão G, Colbourne J, Dennis PJ, da Costa MS. A hot water supply as the source of Legionella pneumophila in incubators of a neonatology unit. J Hosp Infect 1990; 15:255-63. [PMID: 1971632 DOI: 10.1016/0195-6701(90)90033-k] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.7] [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: 12/29/2022]
Abstract
The humidification trays of five of seven incubators in a neonatology unit of a hospital were found to be colonized with Legionella pneumophila, serogroup 1. Bacteriological analysis of the water in the humidification trays showed very large numbers of heterotrophic bacteria, one of which also contained Pseudomonas aeruginosa. Two hot water systems supply the neonatology unit, either of which is used to add water to the humidification trays; one system (A) is maintained at about 60 degrees C, while the other system (B) is maintained at 45 degrees C. The latter was also found to be colonized with L. pneumophila, Sg1. Monoclonal antibody (Mab) subgrouping of the isolates, indicated that system B was the source of colonization of the humidification trays of the incubators.
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Affiliation(s)
- A Veríssimo
- Departamento de Zoologia, Universidade de Coimbra, Portugal
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31
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Jahn HA, Rocha GM, Kondo M, Schohn DC, Schmitt RL. Natriuresis and phosphaturia during extracellular volume expansion, blood volume expansion or stimulation of the intrathoracic volume receptors. Adv Exp Med Biol 1980; 128:93-105. [PMID: 7424699 DOI: 10.1007/978-1-4615-9167-2_12] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
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