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Lisboa JL, Guimarães MO, Vieira-Andrade RG, Ferreira FM, Ramos-Jorge J, Zarzar PM. Factors associated with the survival of primary maxillary anterior teeth after intrusive luxation: a retrospective longitudinal study. Eur Arch Paediatr Dent 2023; 24:33-42. [PMID: 36114997 DOI: 10.1007/s40368-022-00752-4] [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: 01/19/2022] [Accepted: 09/02/2022] [Indexed: 11/28/2022]
Abstract
PURPOSE To evaluate the survival rate of primary maxillary anterior teeth following intrusive luxation and identify associated factors. METHODS A retrospective longitudinal study was conducted at a primary dental trauma centre using 88 dental records of children with intrusive luxation between 2007 and 2018. The variables of interest were time the tooth remained in the alveolus, degree of intrusion, accentuated overjet, lip protection, visible plaque, compromised germ of the permanent successor, clinical signs of infectious and inflammatory processes, endodontic treatment, pulp canal obliteration, sex, age at the time of trauma, family income, mother's schooling, and immediate care. Descriptive, bivariate, and Cox regression analyses were performed (p < 0.05; 95% CI). RESULTS The 88 dental records of children with intrusive luxation included 128 teeth. Survival rate throughout the follow-up period was 65.6% (n = 84). Age older than three years and eight months (HR 2.28; 95% CI 1.04-4.99; p = 0.039), the development of an infectious process (HR 3.51; 95% CI 1.39-8.86; p = 0.008), development of an inflammatory process (HR 2.35; 95% CI 1.17-4.71; p = 0.016) and compromised germ of the permanent successor (HR 4.38; 95% CI 1.99-9.61; p < 0.001) were associated with a lower survival rate of intruded primary maxillary anterior teeth. CONCLUSION The survival rate during the follow-up period of intruded primary maxillary anterior teeth was considered high. A significantly lower survival rate was associated with age, the occurrence of an infectious process and inflammatory process, and the compromised germ of the permanent successor.
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Affiliation(s)
- J L Lisboa
- Department of Child and Adolescent, Oral Health, Federal University of Minas Gerais, 6627 Presidente Antônio Carlos Ave., Pampulha, Belo Horizonte/MG, Brazil
| | - M O Guimarães
- Department of Child and Adolescent, Oral Health, Federal University of Minas Gerais, 6627 Presidente Antônio Carlos Ave., Pampulha, Belo Horizonte/MG, Brazil
| | - R G Vieira-Andrade
- Department of Child and Adolescent, Oral Health, Federal University of Minas Gerais, 6627 Presidente Antônio Carlos Ave., Pampulha, Belo Horizonte/MG, Brazil
| | - F M Ferreira
- Department of Child and Adolescent, Oral Health, Federal University of Minas Gerais, 6627 Presidente Antônio Carlos Ave., Pampulha, Belo Horizonte/MG, Brazil
| | - J Ramos-Jorge
- Department of Child and Adolescent, Oral Health, Federal University of Minas Gerais, 6627 Presidente Antônio Carlos Ave., Pampulha, Belo Horizonte/MG, Brazil
| | - P M Zarzar
- Department of Child and Adolescent, Oral Health, Federal University of Minas Gerais, 6627 Presidente Antônio Carlos Ave., Pampulha, Belo Horizonte/MG, Brazil.
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Martins FC, Videira RA, Oliveira MM, Silva-Maia D, Ferreira FM, Peixoto FP. Parabens enhance the calcium-dependent testicular mitochondrial permeability transition: Their relevance on the reproductive capacity in male animals. J Biochem Mol Toxicol 2020; 35:e22661. [PMID: 33140513 DOI: 10.1002/jbt.22661] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2020] [Revised: 08/31/2020] [Accepted: 10/20/2020] [Indexed: 12/18/2022]
Abstract
Parabens, alkyl ester derivatives from p-hydroxybenzoic acid, are extensively used as antimicrobial preservatives. Nonetheless, due to its widespread and massive employment, several studies highlighted the association between parabens and alterations in the reproductive system. This study aimed to relate the adverse effect of the most commonly used parabens in testis mitochondria with male fertility. From all the parabens used, propyl and butyl were the ones that most negatively decreased the respiratory control ratio. In the case of butyl, inhibitions of 20% and 60% were observed, respectively, at the lowest and highest concentration, when compared to the control group. The membrane potential was only significantly affected by propyl (14%) and butyl (31%), and at a concentration of 250 µM. Succinate dehydrogenase, cytochrome c oxidase, and ATPase activities showed a nonsignificant decrease. Cytochrome c reductase, on the other hand, showed statistically significant inhibitions for both propyl (56%) and butylparaben (55%). The susceptibility to the mitochondrial permeability transition pore (MPTP) opening was increased by all parabens, although this increase was markedly significant for propyl and butyl. These results show that the susceptibility of mitochondria to parabens is dependent on the alkyl chain length and parabens hydrophobicity, and the main mitochondrial target is Complex II-III and MPTP. Hence, this study demonstrates the contribution of parabens exposition to the inhibition of testis mitochondrial function and their putative noxious effect on the male reproductive system.
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Affiliation(s)
- Fátima C Martins
- Department of Biology and Environment, CQVR, University of Trás-os-Montes and Alto Douro, UTAD, Vila Real, Portugal
| | - Romeu A Videira
- REQUIMTE/LAQV, Laboratório de Farmacognosia, Departamento de Química, Faculdade de Farmácia, Universidade do Porto, Porto, Portugal
| | - Maria Manuel Oliveira
- Department of Chemistry, CQVR, University of Trás-os-Montes and Alto Douro, Vila Real, Portugal
| | - Daniela Silva-Maia
- Department of Veterinary Sciences, University of Trás-os-Montes and Alto Douro, Vila Real, Portugal
| | - Fernanda M Ferreira
- Department of Environment, Centre for Functional Ecology (Coimbra), Coimbra College of Agriculture, Polytechnic Institute of Coimbra, Bencanta, Portugal
| | - Francisco P Peixoto
- Department of Biology and Environment, CQVR, University of Trás-os-Montes and Alto Douro, UTAD, Vila Real, Portugal
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Muñoz JJ, Anauate AC, Amaral AG, Ferreira FM, Meca R, Ormanji MS, Boim MA, Onuchic LF, Heilberg IP. Identification of housekeeping genes for microRNA expression analysis in kidney tissues of Pkd1 deficient mouse models. Sci Rep 2020; 10:231. [PMID: 31937827 PMCID: PMC6959247 DOI: 10.1038/s41598-019-57112-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [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: 08/15/2019] [Accepted: 12/21/2019] [Indexed: 12/11/2022] Open
Abstract
Polycystic kidney disease is a complex clinical entity which comprises a group of genetic diseases that leads to renal cyst development. We evaluated the most suitable housekeeping genes for microRNA expression by RT-qPCR analyses of kidney tissues in Pkd1-deficient mouse models from a panel of five candidates genes (miR-20a, miR-25, miR-26a, miR-191 and U6) and 3 target genes (miR-17, miR-21 and let-7a) using samples from kidneys of cystic mice (Pkd1flox/flox:Nestincre, CY), non-cystic controls (Pkd1flox/flox, NC), Pkd1-haploinsufficient (Pkd1+/−, HT), wild-type controls (Pkd1+/+, WT), severely cystic mice (Pkd1V/V, SC), wild-type controls (CO). The stability of the candidate genes was investigated using NormFinder, GeNorm, BestKeeper, DataAssist, and RefFinder software packages and the comparative ΔCt method. The analyses identified miR-26a as the most stable housekeeping gene for all kidney samples, miR-20a for CY and NC, miR-20a and miR-26a for HT and WT, and miR-25 and miR-26a for SC and CO. Expression of miR-21 was upregulated in SC compared to CO and trends of miR-21 upregulation and let-7a downregulation in CY and HT compared to its control kidneys, when normalized by different combinations of miR-20a, miR-25 and miR-26a. Our findings established miR-20a, miR-25, and miR-26a as the best housekeeping genes for miRNA expression analyses by RT-qPCR in kidney tissues of Pkd1-deficient mouse models.
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Affiliation(s)
- J J Muñoz
- Nephrology Division, Department of Medicine, Universidade Federal de São Paulo, São Paulo, Brazil
| | - A C Anauate
- Nephrology Division, Department of Medicine, Universidade Federal de São Paulo, São Paulo, Brazil
| | - A G Amaral
- Divisions of Molecular Medicine and Nephrology, University of São Paulo School of Medicine, São Paulo, Brazil
| | - F M Ferreira
- Laboratory of Immunology, Heart Institute, University of São Paulo School of Medicine, São Paulo, Brazil
| | - R Meca
- Nephrology Division, Department of Medicine, Universidade Federal de São Paulo, São Paulo, Brazil
| | - M S Ormanji
- Nephrology Division, Department of Medicine, Universidade Federal de São Paulo, São Paulo, Brazil
| | - M A Boim
- Nephrology Division, Department of Medicine, Universidade Federal de São Paulo, São Paulo, Brazil
| | - L F Onuchic
- Divisions of Molecular Medicine and Nephrology, University of São Paulo School of Medicine, São Paulo, Brazil
| | - I P Heilberg
- Nephrology Division, Department of Medicine, Universidade Federal de São Paulo, São Paulo, Brazil.
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Amaral‐Freitas G, Brasileiro CB, Zarzar PM, Ferreira FM. Rare dental developmental disturbance in primary and permanent teeth following trauma prior to tooth eruption: Case report. Dent Traumatol 2019; 36:79-83. [DOI: 10.1111/edt.12500] [Citation(s) in RCA: 2] [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: 02/08/2019] [Revised: 06/19/2019] [Accepted: 06/20/2019] [Indexed: 12/01/2022]
Affiliation(s)
- Gabrielle Amaral‐Freitas
- Department of Child and Adolescent Oral Health, Faculty of Dentistry Federal University of Minas Gerais Belo Horizonte Minas Gerais Brazil
| | - Cláudia B. Brasileiro
- Department of Clinical, Pathology and Dental Surgery, Faculty of Dentistry Federal University of Minas Gerais Belo Horizonte Minas Gerais Brazil
| | - Patrícia M. Zarzar
- Department of Child and Adolescent Oral Health, Faculty of Dentistry Federal University of Minas Gerais Belo Horizonte Minas Gerais Brazil
| | - Fernanda M. Ferreira
- Department of Child and Adolescent Oral Health, Faculty of Dentistry Federal University of Minas Gerais Belo Horizonte Minas Gerais Brazil
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Todero SRB, Cavalcante-Leão BL, Fraiz FC, Rebellato NLB, Ferreira FM. The association of childhood sleep problems with the prevalence of traumatic dental injury in schoolchildren. Dent Traumatol 2018; 35:41-47. [PMID: 30300474 DOI: 10.1111/edt.12448] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [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: 05/25/2018] [Revised: 10/01/2018] [Accepted: 10/02/2018] [Indexed: 11/28/2022]
Abstract
BACKGROUND/AIM Sleep quality exerts an influence on attention level and motor skills and is associated with accidental injuries in children. The aim of this study was to evaluate the association between traumatic dental injury and sleep behaviour in children. MATERIAL AND METHODS A cross-sectional study was conducted in a small city in southern Brazil with a representative sample of schoolchildren aged 8-10 years (n = 537). Weight and height were measured, and examinations were performed for the determination of clinical occlusion and traumatic dental injury. The parents answered the Sleep Behaviour Questionnaire and questions addressing socio-demographic characteristics. RESULTS The prevalence of traumatic dental injury was 22% (95% CI: 19-26) and was higher among children who woke three to four times per night (PR = 3.30; 95% CI: 2.47-4.39), those who fell asleep in the parental bed (PR = 1.41; 95% CI: 1.09-1.83), those who were not in a good mood on waking up in the morning (PR = 1.30; 95% CI: 1.02-1.65), those who became sleepy while sitting and/or studying (PR = 1.57; 95% CI: 1.09-2.24) and while watching TV (PR = 1.41; 95% CI: 1.0005-1.97) and those who had bad dreams (PR = 1.35; 95% CI: 1.04-1.76). The Poisson multiple regression model with a multilevel approach revealed that the prevalence of traumatic dental injury was 1.51-fold higher among children with daytime drowsiness (PR = 1.51; 95% CI: 1.11-2.04) after adjusting for socio-demographic, occlusal and anthropometric variables. CONCLUSION Sleep problems were associated with a higher prevalence of traumatic dental injury among the children analysed.
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Affiliation(s)
- Sara R B Todero
- Department of Stomatology, Universidade Federal do Paraná, Curitiba, Paraná, Brazil
| | - Bianca L Cavalcante-Leão
- Department of Stomatology, Universidade Federal do Paraná, Curitiba, Paraná, Brazil.,Universidade Tuiuti do Paraná, Curitiba, Paraná, Brazil
| | - Fabian C Fraiz
- Department of Stomatology, Universidade Federal do Paraná, Curitiba, Paraná, Brazil
| | - Nelson L B Rebellato
- Department of Stomatology, Universidade Federal do Paraná, Curitiba, Paraná, Brazil
| | - Fernanda M Ferreira
- Department of Pediatric Dentistry and Orthodontics, School of Dentistry, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
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Gomes MC, Neves ÉTB, Perazzo MF, Paiva SM, Ferreira FM, Granville-Garcia AF. Contextual and individual determinants of oral health-related quality of life among five-year-old children: a multilevel analysis. PeerJ 2018; 6:e5451. [PMID: 30186681 PMCID: PMC6119455 DOI: 10.7717/peerj.5451] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [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: 02/22/2018] [Accepted: 07/21/2018] [Indexed: 12/11/2022] Open
Abstract
Background Contextual factors may influence oral health-related quality of life (OHRQoL) in children. The aim of the present study was to evaluate the influence of individual and contextual determinants of OHRQoL based on the perceptions of children. Methods A cross-sectional study was conducted with a representative sample of 769 five-year-old children from public and private preschools in a city in the countryside of northeast Brazil. Parents/caregivers answered questionnaires addressing psychological aspects, sociodemographic data and aspects of the child’s oral health. The children answered the child version of the Scale of Oral Health Outcomes for five-year-old children and were submitted to oral examinations. Variables related to the context were obtained from the schools and official municipal publications. Unadjusted and adjusted multilevel Poisson regression models were used to investigate associations between variables. Results In the adjusted analysis, parent’s/caregiver’s schooling, household income, parent’s/caregiver’s age, a history of dental pain, dental caries and its consequences and traumatic dental injury were considered individual determinants of OHRQoL according to the children’s self-reports. After the incorporation of the contextual determinants, the association between parent’s/caregiver’s schooling and OHRQoL lost its significance. Type of school was the context variable that remained associated with OHRQoL. Discussion Besides the clinical and sociodemographic individual characteristics, characteristics of the school environment in which the child studies are associated with self-reported impacts on OHRQoL.
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Affiliation(s)
- Monalisa C Gomes
- Departamento de Odontologia, Universidade Estadual da Paraíba, Campina Grande, Paraíba, Brasil
| | - Érick T B Neves
- Departamento de Odontologia, Universidade Estadual da Paraíba, Campina Grande, Paraíba, Brasil
| | - Matheus F Perazzo
- Departamento de Odontopediatria e Ortodontia, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brasil
| | - Saul M Paiva
- Departamento de Odontopediatria e Ortodontia, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brasil
| | - Fernanda M Ferreira
- Departamento de Odontopediatria e Ortodontia, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brasil
| | - Ana F Granville-Garcia
- Departamento de Odontologia, Universidade Estadual da Paraíba, Campina Grande, Paraíba, Brasil
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Ferreira FM, Delmonte CC, Novato TLP, Monteiro CMO, Daemon E, Vilela FMP, Amaral MPH. Acaricidal activity of essential oil of Syzygium aromaticum, hydrolate and eugenol formulated or free on larvae and engorged females of Rhipicephalus microplus. Med Vet Entomol 2018; 32:41-47. [PMID: 28833280 DOI: 10.1111/mve.12259] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [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: 01/13/2017] [Revised: 04/04/2017] [Accepted: 06/12/2017] [Indexed: 06/07/2023]
Abstract
The cattle tick, Rhipicephalus microplus (Canestrini, 1888) (Ixodida: Ixodidae), is the most important ectoparasite in cattle-breeding areas and is responsible for severe economic losses. Synthetic acaricides have been used to control this parasite. However, the need for safer products has stimulated the search for new acaricides, such as those to be obtained from medicinal plants. The essential oil of Syzygium aromaticum (clove) has many biological properties and shows great potential for use in veterinary applications. In the context of the need for new agents, this study investigated the in vitro properties of the hydrolate, essential oil and the main constituent of S. aromaticum, eugenol, in formulated and free applications against larvae and females of R. microplus. Eugenol and the essential oil caused 100% mortality in larvae at starting applications of 2.5 mg/mL and 5.0 mg/mL, respectively. The hydrolate showed no activity. Both eugenol and essential oil had good efficacy in adult immersion tests at 50 mg/mL and achieved 100% efficacy at a concentration of 100 mg/mL. The results of these tests reaffirm the important potential of clove essential oil and eugenol.
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Affiliation(s)
- F M Ferreira
- Departamento Farmacêutico, Faculdade de Farmácia, Universidade Federal de Juiz de Fora, Juiz de Fora, MG, Brazil
| | - C C Delmonte
- Programa de Pós-Graduação em Comportamento e Biologia Animal, Instituto de Ciências Biológicas, Universidade Federal de Juiz de Fora, Juiz de Fora, MG, Brazil
| | - T L P Novato
- Programa de Pós-Graduação em Ciências Veterinárias, Universidade Federal Rural do Rio de Janeiro, Seropédica, RJ, Brazil
| | - C M O Monteiro
- Instituto de Patologia Tropical Saúde Pública, Universidade Federal de Goiás, Goiânia, GO, Brazil
| | - E Daemon
- Programa de Pós-Graduação em Comportamento e Biologia Animal, Instituto de Ciências Biológicas, Universidade Federal de Juiz de Fora, Juiz de Fora, MG, Brazil
| | - F M P Vilela
- Departamento Farmacêutico, Faculdade de Farmácia, Universidade Federal de Juiz de Fora, Juiz de Fora, MG, Brazil
| | - M P H Amaral
- Departamento Farmacêutico, Faculdade de Farmácia, Universidade Federal de Juiz de Fora, Juiz de Fora, MG, Brazil
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Camargo JCS, Varela V, Ferreira FM, Pougy L, Ochiai AM, Santos ME, Grande MCLR. The Waterbirth Project: São Bernardo Hospital experience. Women Birth 2018; 31:e325-e333. [PMID: 29305115 DOI: 10.1016/j.wombi.2017.12.008] [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: 06/29/2017] [Revised: 11/17/2017] [Accepted: 12/11/2017] [Indexed: 11/29/2022]
Abstract
INTRODUCTION The following quantitative observational study aimed to analyse the maternal and neonatal outcomes of 90 low-risk pregnant women who gave birth in water at São Bernardo Hospital. METHODS A form containing information on the obstetric history of the parturient, the type of immersion, and the labour and birth follow-up was used by midwives to collect the data. BACKGROUND The Apgar score (at 1min after birth) used in this study, called Aqua Apgar, was adapted by Cornelia Enning. RESULTS The mean water immersion time was 1h and 46min and had an influence on the duration of labour (mean 5h and 37min), with a statistically significant difference (P=0.004). There was a decreased cervical dilatation time and a shorter duration of the expulsion phase. In the immersion scenario, 30% of the women did not undergo any examination to assess the length of the cervix, and 57.8% presented intact perennial areas or first-degree tears. As for neonatal outcomes, during maternal immersion, 97% maintained normal fetal heart rates (between 110 and 160 beats per minute) and Aqua Apgar was higher than 7, both in the first minute (mean of 9.4) and in the fifth minute of life (mean of 9.9). CONCLUSION These safety outcomes, based on sound scientific evidence, should increasingly support and inform clinical decisions and increase the number of waterbirths in health facilities. The results of this study align with growing evidence that suggests waterbirth is a safe delivery option and therefore should be offered to women.
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Affiliation(s)
- Joyce C S Camargo
- Abel Salazar Institute of Biomedical Sciences of the University of Porto, Portugal; School of Arts, Sciences and Humanities of the University of São Paulo, Rua Arlindo Béttio, 1000 - Jardim Keralux, São Paulo, SP 03828-000, Brazil.
| | - Vitor Varela
- São Bernardo Hospital - Setúbal, Rua Camilo Castelo Branco, 2910-445 Setúbal, Portugal.
| | - Fernanda M Ferreira
- University of São Paulo, School of Nursing of University of São Paulo, Av. Dr. Enéas de Carvalho Aguiar, 419, 05403-000 São Paulo, SP, Brazil.
| | - Lucila Pougy
- School of Arts, Sciences and Humanities of the University of São Paulo, Rua Arlindo Béttio, 1000 - Jardim Keralux, São Paulo, SP 03828-000, Brazil.
| | - Angela M Ochiai
- School of Arts, Sciences and Humanities of the University of São Paulo, Rua Arlindo Béttio, 1000 - Jardim Keralux, São Paulo, SP 03828-000, Brazil.
| | | | - Maria Catarina L R Grande
- Faculty of Psychology and Educational Sciences of the University of Porto, Rua Alfredo Allen, 4200-135 Porto, Portugal.
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Pereira FAO, Assunção LRS, Ferreira FM, Fraiz FC. Emergency Dental Care of Children and Adolescents in Basic Health Unit and Emergency Care Unit. Pesqui bras odontopediatria clín integr 2017. [DOI: 10.4034/pboci.2017.171.13] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [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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Bado FMR, Ferreira FM, Barbosa TS, Mialhe FL. Translation and Cross-cultural Adaptation of the Oral Health Literacy Assessment-Spanish to Brazilian Portuguese. Pesqui bras odontopediatria clín integr 2017. [DOI: 10.4034/pboci.2017.171.19] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [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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McCarthy ME, Al Kahteeb MAZ, Ferreira FM, Ellis AD. PMD tolerant nonlinear compensation using in-line phase conjugation. Opt Express 2016; 24:3385-3392. [PMID: 26906997 DOI: 10.1364/oe.24.003385] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
In this paper, we numerically investigate the impact of polarisation mode dispersion on the efficiency of compensation of nonlinear transmission penalties for systems employing one of more inline phase conjugation devices. We will show that reducing the spacing between phase conjugations allows for significantly improved performance in the presence polarisation mode dispersion or a significant relaxation in the acceptable level of polarization mode dispersion. We show that these results are consistent with previously presented full statistical analysis of nonlinear transmission appropriately adjusted for the reduced section length undergoing compensation.
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Monteiro S, Ferreira FM, Pinto V, Roque S, Morais M, de Sá-Calçada D, Mota C, Correia-Neves M, Cerqueira JJ. Absence of IFNγ promotes hippocampal plasticity and enhances cognitive performance. Transl Psychiatry 2016; 6:e707. [PMID: 26731444 PMCID: PMC5073154 DOI: 10.1038/tp.2015.194] [Citation(s) in RCA: 63] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/29/2015] [Accepted: 10/05/2015] [Indexed: 01/31/2023] Open
Abstract
Cognitive functioning can be differentially modulated by components of the immune system. Interferon-γ (IFNγ) is a pro-inflammatory cytokine whose production is altered in many conditions displaying some degree of cognitive deficits, although its role in cognitive functioning is still unclear. Here we show that the absence of IFNγ selectively enhances cognitive behaviours in tasks in which the hippocampus is implicated. Moreover, the absence of IFNγ leads to volumetric and cell density changes that are restricted to the dorsal part of the hippocampus. In the dorsal hippocampus, the absence of this pro-inflammatory cytokine leads to an increase in the numbers of newly born neurons in the subgranular zone of the dentate gyrus (DG), an adult neurogenic niche known to support learning and memory, and to an enlargement of the dendritic arborization of DG granule and cornu ammonis (CA)1 pyramidal neurons. Moreover, it also modestly impacts synaptic plasticity, by decreasing the paired-pulse facilitation in the Schaffer collateral to CA1 pyramidal cell synapses. Taken together, our results provide evidence that IFNγ is a negative regulator of hippocampal functioning, as its absence positively impacts on dorsal hippocampus structure, cell density, neuronal morphology and synaptic plasticity. Importantly, these neuroplastic changes are associated with improved performance in learning and memory tasks. Therefore, blockage of the IFNγ signalling may present as promising therapeutic targets for the treatment of inflammation-associated cognitive dysfunction.
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Affiliation(s)
- S Monteiro
- Life and Health Sciences Research Institute, School of Health Sciences, University of Minho, Campus de Gualtar, Braga, Portugal,Life and Health Sciences Research Institute, 3B's - PT Government Associate Laboratory, Braga/Guimarães, Portugal
| | - F M Ferreira
- Life and Health Sciences Research Institute, School of Health Sciences, University of Minho, Campus de Gualtar, Braga, Portugal,Life and Health Sciences Research Institute, 3B's - PT Government Associate Laboratory, Braga/Guimarães, Portugal
| | - V Pinto
- Life and Health Sciences Research Institute, School of Health Sciences, University of Minho, Campus de Gualtar, Braga, Portugal,Life and Health Sciences Research Institute, 3B's - PT Government Associate Laboratory, Braga/Guimarães, Portugal
| | - S Roque
- Life and Health Sciences Research Institute, School of Health Sciences, University of Minho, Campus de Gualtar, Braga, Portugal,Life and Health Sciences Research Institute, 3B's - PT Government Associate Laboratory, Braga/Guimarães, Portugal
| | - M Morais
- Life and Health Sciences Research Institute, School of Health Sciences, University of Minho, Campus de Gualtar, Braga, Portugal,Life and Health Sciences Research Institute, 3B's - PT Government Associate Laboratory, Braga/Guimarães, Portugal
| | - D de Sá-Calçada
- Life and Health Sciences Research Institute, School of Health Sciences, University of Minho, Campus de Gualtar, Braga, Portugal,Life and Health Sciences Research Institute, 3B's - PT Government Associate Laboratory, Braga/Guimarães, Portugal
| | - C Mota
- Life and Health Sciences Research Institute, School of Health Sciences, University of Minho, Campus de Gualtar, Braga, Portugal,Life and Health Sciences Research Institute, 3B's - PT Government Associate Laboratory, Braga/Guimarães, Portugal
| | - M Correia-Neves
- Life and Health Sciences Research Institute, School of Health Sciences, University of Minho, Campus de Gualtar, Braga, Portugal,Life and Health Sciences Research Institute, 3B's - PT Government Associate Laboratory, Braga/Guimarães, Portugal
| | - J J Cerqueira
- Life and Health Sciences Research Institute, School of Health Sciences, University of Minho, Campus de Gualtar, Braga, Portugal,Life and Health Sciences Research Institute, 3B's - PT Government Associate Laboratory, Braga/Guimarães, Portugal,Life and Health Sciences Research Institute (ICVS), School of Health Sciences, University of Minho, Campus de Gualtar, ICVS/3B's - PT Government Associate Laboratory, 4710-057 Braga, Portugal. E-mail:
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Junkes MC, Fraiz FC, Sardenberg F, Lee JY, Paiva SM, Ferreira FM. Validity and Reliability of the Brazilian Version of the Rapid Estimate of Adult Literacy in Dentistry--BREALD-30. PLoS One 2015; 10:e0131600. [PMID: 26158724 PMCID: PMC4497720 DOI: 10.1371/journal.pone.0131600] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.7] [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: 12/10/2014] [Accepted: 06/03/2015] [Indexed: 11/18/2022] Open
Abstract
Objective The aim of the present study was to translate, perform the cross-cultural adaptation of the Rapid Estimate of Adult Literacy in Dentistry to Brazilian-Portuguese language and test the reliability and validity of this version. Methods After translation and cross-cultural adaptation, interviews were conducted with 258 parents/caregivers of children in treatment at the pediatric dentistry clinics and health units in Curitiba, Brazil. To test the instrument's validity, the scores of Brazilian Rapid Estimate of Adult Literacy in Dentistry (BREALD-30) were compared based on occupation, monthly household income, educational attainment, general literacy, use of dental services and three dental outcomes. Results The BREALD-30 demonstrated good internal reliability. Cronbach’s alpha ranged from 0.88 to 0.89 when words were deleted individually. The analysis of test-retest reliability revealed excellent reproducibility (intraclass correlation coefficient = 0.983 and Kappa coefficient ranging from moderate to nearly perfect). In the bivariate analysis, BREALD-30 scores were significantly correlated with the level of general literacy (rs = 0.593) and income (rs = 0.327) and significantly associated with occupation, educational attainment, use of dental services, self-rated oral health and the respondent’s perception regarding his/her child's oral health. However, only the association between the BREALD-30 score and the respondent’s perception regarding his/her child's oral health remained significant in the multivariate analysis. Conclusion The BREALD-30 demonstrated satisfactory psychometric properties and is therefore applicable to adults in Brazil.
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Affiliation(s)
- Monica C. Junkes
- Department of Stomatology, Universidade Federal do Paraná, Curitiba, Paraná, Brazil
| | - Fabian C. Fraiz
- Department of Stomatology, Universidade Federal do Paraná, Curitiba, Paraná, Brazil
| | - Fernanda Sardenberg
- Department of Stomatology, Universidade Federal do Paraná, Curitiba, Paraná, Brazil
| | - Jessica Y. Lee
- Department of Pediatric Dentistry, University of North Caroline, Chapel Hill, North Carolina, United States of America
| | - Saul M. Paiva
- Department of Pediatric Dentistry and Orthodontics, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
| | - Fernanda M. Ferreira
- Department of Stomatology, Universidade Federal do Paraná, Curitiba, Paraná, Brazil
- Department of Pediatric Dentistry, University of North Caroline, Chapel Hill, North Carolina, United States of America
- * E-mail:
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Gil GS, Morikava FS, Santin GC, Pintarelli TP, Fraiz FC, Ferreira FM. Reliability of self-reported toothbrushing frequency as an indicator for the assessment of oral hygiene in epidemiological research on caries in adolescents: a cross-sectional study. BMC Med Res Methodol 2015; 15:14. [PMID: 25887179 PMCID: PMC4355135 DOI: 10.1186/s12874-015-0002-5] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2014] [Accepted: 01/27/2015] [Indexed: 12/19/2022] Open
Abstract
Background In the present state of knowledge regarding the etiology of dental caries, it is unacceptable for studies addressing factors associated with this outcome to disregard oral hygiene. Simple, valid methods are needed for the assessment of oral hygiene in adolescents to allow this condition to be properly investigated in epidemiological studies on caries and assist in the establishment of health promotion measures. The aim of the present study was to test the hypothesis that the self-reported toothbrushing frequency can be used as a proxy measure for clinical oral hygiene indices in epidemiological studies on dental caries in adolescents. Methods A cross-sectional study was conducted with a representative sample (n = 589) of 12-year-old school children in a medium-sized city in southern Brazil. A detailed questionnaire addressing socio-demographic and economic characteristics was sent to primary caregivers. Adolescents answered a brief self-administered questionnaire on behavioral characteristics, including toothbrushing frequency and sugar intake. Samples of stimulated saliva were collected from the adolescents and evaluated for levels of mutans streptococci and lactobacilli using Dentacult kits I and II, respectively. Examiners who had undergone a training and calibration exercise (kappa > 0.81) performed the clinical examination of the adolescents. Caries experience was assessed using the decayed, missing and filled teeth index. Oral hygiene was determined using the Simplified Oral Hygiene Index and the Visible Plaque Index. Results When the oral hygiene variables were used alone in the multiple models, significant associations with dental caries were found. When Simplified Oral Hygiene Index and/or Plaque Index were used together with toothbrushing frequency in the same model, only the latter was significantly associated with dental caries. A significant association was also found between self-reported toothbrushing frequency and the clinical indices. Conclusion Based on the present findings, self-reported toothbrushing frequency can be used as a proxy measure for clinical oral hygiene indices, which facilitates data collection in epidemiological studies addressing dental caries in adolescents.
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Affiliation(s)
- Giovana S Gil
- Department of Stomatology, Federal University of Parana, Av. Prefeito Lothário Meissner, 632, Curitiba, Brazil.
| | - Francine S Morikava
- Department of Stomatology, Federal University of Parana, Av. Prefeito Lothário Meissner, 632, Curitiba, Brazil.
| | - Gabriela C Santin
- Department of Stomatology, Federal University of Parana, Av. Prefeito Lothário Meissner, 632, Curitiba, Brazil.
| | - Tatiana P Pintarelli
- Department of Stomatology, Federal University of Parana, Av. Prefeito Lothário Meissner, 632, Curitiba, Brazil.
| | - Fabian C Fraiz
- Department of Stomatology, Federal University of Parana, Av. Prefeito Lothário Meissner, 632, Curitiba, Brazil.
| | - Fernanda M Ferreira
- Department of Stomatology, Federal University of Parana, Av. Prefeito Lothário Meissner, 632, Curitiba, Brazil.
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Bruniera FR, Ferreira FM, Saviolli LRM, Bacci MR, Feder D, da Luz Gonçalves Pedreira M, Sorgini Peterlini MA, Azzalis LA, Campos Junqueira VB, Fonseca FLA. The use of vancomycin with its therapeutic and adverse effects: a review. Eur Rev Med Pharmacol Sci 2015; 19:694-700. [PMID: 25753888] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
OBJECTIVE Vancomycin (VCM) is a tricyclic glycopeptide antibiotic produced by Streptococcus orientalis. Widely used in hospitals, it is indicated to fight severe infections caused by Gram-positive bacteria, especially with the advent of MRSA (methicillin-resistant Staphylococcus aureus), penicillin-resistant pneumococci among others. Furthermore, it is indicated for the treatment of patients allergic to penicillins and cephalosporins. Dose recommendations, dilution rates and types of infusion are controversial and also result in toxic effects. Aim of this paper was to perform a literature review showing the therapeutic and adverse effects of vancomycin. MATERIALS AND METHODS This is a literature review of recent articles published on MEDLINE and SciELO databases in English, Portuguese and Spanish. RESULTS The main adverse effects of vancomycin are: hypotension, phlebitis, nephrotoxicity, ototoxicity, hypersensitivity reactions, red man syndrome, neutropenia, chills, fever, interstitial nephritis. CONCLUSIONS The use of vancomycin is still very common; however, inadequate doses and prolonged therapy pose a risk of increasing minimum inhibitory concentrations (MICs), resulting in subtherapeutic levels, treatment failures and toxicity. Therefore, further studies should be conducted to optimize the administration of vancomycin, monitoring treatments from the beginning in order to ensure a safe and effective use of the drug.
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Affiliation(s)
- F R Bruniera
- Discipline of Pharmacology, Morphology Department, Faculdade de Medicina do ABC, Santo André, Brazil.
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Santos C, Botelho G, Caldeira I, Torres A, Ferreira FM. Antioxidant activity assessment in fruit liquors and spirits: methods comparison. Ciência Téc Vitiv 2014. [DOI: 10.1051/ctv/20142901028] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
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Torres-Pereira CC, Morosini IA, Oliveira DC, Fonseca BB, Ferreira FM, Fraiz FC. OI0377 Teledentistry for the screening of oral mucosa alterations in juvenile offenders. Oral Surg Oral Med Oral Pathol Oral Radiol 2014. [DOI: 10.1016/j.oooo.2014.01.204] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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18
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Neves K, Ferreira FM, Tovar-Moll F, Gravett N, Bennett NC, Kaswera C, Gilissen E, Manger PR, Herculano-Houzel S. Cellular scaling rules for the brain of afrotherians. Front Neuroanat 2014; 8:5. [PMID: 24596544 PMCID: PMC3925844 DOI: 10.3389/fnana.2014.00005] [Citation(s) in RCA: 34] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2013] [Accepted: 01/27/2014] [Indexed: 12/05/2022] Open
Abstract
Quantitative analysis of the cellular composition of rodent, primate and eulipotyphlan brains has shown that non-neuronal scaling rules are similar across these mammalian orders that diverged about 95 million years ago, and therefore appear to be conserved in evolution, while neuronal scaling rules appear to be free to vary in evolution in a clade-specific manner. Here we analyze the cellular scaling rules that apply to the brain of afrotherians, believed to be the first clade to radiate from the common eutherian ancestor. We find that afrotherians share non-neuronal scaling rules with rodents, primates and eulipotyphlans, as well as the coordinated scaling of numbers of neurons in the cerebral cortex and cerebellum. Afrotherians share with rodents and eulipotyphlans, but not with primates, the scaling of number of neurons in the cortex and in the cerebellum as a function of the number of neurons in the rest of the brain. Afrotheria also share with rodents and eulipotyphlans the neuronal scaling rules that apply to the cerebral cortex. Afrotherians share with rodents, but not with eulipotyphlans nor primates, the neuronal scaling rules that apply to the cerebellum. Importantly, the scaling of the folding index of the cerebral cortex with the number of neurons in the cerebral cortex is not shared by either afrotherians, rodents, or primates. The sharing of some neuronal scaling rules between afrotherians and rodents, and of some additional features with eulipotyphlans and primates, raise the interesting possibility that these shared characteristics applied to the common eutherian ancestor. In turn, the clade-specific characteristics that relate to the distribution of neurons along the surface of the cerebral cortex and to its degree of gyrification suggest that these characteristics compose an evolutionarily plastic suite of features that may have defined and distinguished mammalian groups in evolution.
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Affiliation(s)
- Kleber Neves
- Instituto de Ciências Biomédicas, Universidade Federal do Rio de Janeiro Rio de Janeiro, Brasil ; Instituto Nacional de Neurociência Translacional, CNPq/MCT São Paulo, Brasil
| | - Fernanda M Ferreira
- D'Or Institute for Research and Education (IDOR) Rio de Janeiro, Brasil ; Bioimaging National Center, Federal University of Rio de Janeiro Rio de Janeiro, Brazil
| | - Fernanda Tovar-Moll
- Instituto de Ciências Biomédicas, Universidade Federal do Rio de Janeiro Rio de Janeiro, Brasil ; Instituto Nacional de Neurociência Translacional, CNPq/MCT São Paulo, Brasil ; D'Or Institute for Research and Education (IDOR) Rio de Janeiro, Brasil ; Bioimaging National Center, Federal University of Rio de Janeiro Rio de Janeiro, Brazil
| | - Nadine Gravett
- Department of Zoology and Entomology, University of Pretoria Pretoria, South Africa
| | - Nigel C Bennett
- Faculté des Sciences, University of Kisangani Kisangani, Democratic Republic of Congo
| | - Consolate Kaswera
- Department of African Zoology, Royal Museum for Central Africa Tervuren, Belgium
| | - Emmanuel Gilissen
- Laboratory of Histology and Neuropathology, Université Libre de Bruxelles Brussels, Belgium ; Department of Anthropology, University of Arkansas Fayetteville, AR, USA
| | - Paul R Manger
- School of Anatomical Sciences, University of the Witwatersrand Johannesburg, South Africa
| | - Suzana Herculano-Houzel
- Instituto de Ciências Biomédicas, Universidade Federal do Rio de Janeiro Rio de Janeiro, Brasil ; Instituto Nacional de Neurociência Translacional, CNPq/MCT São Paulo, Brasil
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Santin GC, Martins CC, Pordeus IA, Calixto FF, Ferreira FM. Food Insecurity and Oral Health: A Systematic Review. Pesqui bras odontopediatria clín integr 2014. [DOI: 10.4034/pboci.2014.144.08] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [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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Sousa V, Ferreira FM, Meireles I, Almeida N, Saldanha Matos J. Comparison of the inspector and rating protocol uncertainty influence in the condition rating of sewers. Water Sci Technol 2014; 69:862-867. [PMID: 24569288 DOI: 10.2166/wst.2013.764] [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] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Wastewater drainage systems asset management decisions, in particular regarding rehabilitation interventions, are largely dependent on close-circuit television (CCTV) inspection results. However, the results of CCTV inspections are affected by several sources of uncertainty. Within the present communication, the inspector's uncertainty is quantified by comparing periodic inspection reports from three trunk sewers of a Portuguese sewer system. The inspections were carried out by the same experienced inspector using the same equipment. Therefore, the uncertainties from the lack of experience and the difference of the inspector and equipment were ruled out. The protocol uncertainty is also quantified comparing the results obtained with the Water Research Center (WRc) and the National Research Council of Canada (NRC) protocols condition ratings. Both operational and structural condition rating were analysed, but emphasis was given to the later since it dictates the repair and replacement interventions.
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Affiliation(s)
- V Sousa
- Department of Civil Engineering, Architecture and GeoResources, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais 1049-001 Lisbon, Portugal E-mail:
| | - F M Ferreira
- Department of Civil Engineering, Architecture and GeoResources, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais 1049-001 Lisbon, Portugal E-mail:
| | - I Meireles
- Department of Civil Engineering, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal
| | - N Almeida
- Department of Civil Engineering, Architecture and GeoResources, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais 1049-001 Lisbon, Portugal E-mail:
| | - J Saldanha Matos
- Department of Civil Engineering, Architecture and GeoResources, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais 1049-001 Lisbon, Portugal E-mail:
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Gonzales-Sullcahuamán JA, Ferreira FM, de Menezes JV, Paiva SM, Fraiz FC. Oral health-related quality of life among Brazilian dental students. Acta Odontol Latinoam 2013; 26:76-83. [PMID: 24303730] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
This study was conducted to assess oral health-related quality of life (OHRQoL) among Brazilian dental students. A cross-sectional study was carried out involving 300 dental students at the Federal University of Parana, Brazil. To measure OHRQoL, the Oral Health Impact Profile (OHIP-14) was self-administered and a questionnaire was filled out addressing socio-demographic characteristics, health-related aspects and dental experience. Descriptive analysis was performed and both univariate and multivariate Poisson regression with robust variance were used to determine associations between OHRQoL and the covariables. The prevalence of reported impact on OHRQoL was 45 percent. The mean OHIP-14 score was 4.5. In the univariate analysis, the reason for the last visit to the dentist (p = 0.004), reported discomfort in teeth/mouth (p < 0.001) and both self-rated general (p = 0.011) and oral (p < 0.001) health were significantly associated with OHRQoL. The year of academic education was not associated with OHRQoL (p = 0.712). In the multivariate model, students who reported dissatisfaction with their teeth (PR = 1.32; IC 95%: 1.01-1.73), dental pain/sensitivity (PR = 2.36; IC 95%: 1.63-3.40), esthetic dental problems (PR = 1.45; IC 95%: 1.10-1.89), restorative needs (PR = 1.60; IC 95%: 1.01-2.55) and whose last visit to the dentist was for curative treatment (PR = 1.36; IC 95%: 1.05-1.76) had greater impact on OHRQoL. Aspects related to previous dental experience and self-reported oral health problems were associated with OHRQoL.
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Ferreira FM, Moreno AJ, Seiça R, Santos MS, Palmeira CM. Mitochondrial Bioenergetics, Diabetes, and Aging: Top-Down Analysis Using the Diabetic Goto-Kakizaki (GK) Rat as a Model. Toxicol Mech Methods 2012; 16:323-30. [PMID: 20021031 DOI: 10.1080/15376520600616925] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
In the present study we investigated the changes in the oxidative phosphorylation system of liver mitochondria, isolated from diabetic Goto-Kakizaki (GK) and Wistar (control) rats with different ages (6, 12, 26, and 52 weeks). We used a kinetic approach known as "top-down" analysis, which conceptually divides the oxidative phosphorylation system into two subsystems: one producing the protonmotive force (Deltap) and another that consumes Deltap. The overall response of the Deltap generators to Deltap was obtained from an uncoupler titration of respiration rate versus Deltap, while the overall response of Deltap consumers to Deltap was obtained from an inhibitor titration of respiration rate versus Deltap. Our results showed that GK liver mitochondrial preparations presented an increase in Deltap production and phosphorylative subsystems (using succinate as respiratory substrate). The alterations observed may suggest the existence of biochemical compensatory mechanisms to type 2 diabetes mellitus in GK rats during their first year of life, in order to reduce the injury associated with the disease. Furthermore, we observed that liver metabolic efficiency of mitochondrial respiration declined with age, this decrease in respiratory activity being visible both in control and diabetic rats.
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Affiliation(s)
- Fernanda M Ferreira
- Center for Neurosciences and Cell Biology of Coimbra, Department of Zoology, Portugal
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Ferreira FM, Dinis LT, Azedo P, Galhano CI, Simões A, Cardoso SM, Rosário M, Domingues M, Pereira OR, Palmeira CM, Peixoto FP. Antioxidant capacity and toxicological evaluation ofPterospartum tridentatumflower extracts. CyTA - Journal of Food 2012. [DOI: 10.1080/19476337.2011.590233] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Ferreira FM, Palmeira CM, Oliveira MM, Santos D, Simões AM, Rocha SM, Coimbra MA, Peixoto F. Nerolidol effects on mitochondrial and cellular energetics. Toxicol In Vitro 2011; 26:189-96. [PMID: 22138475 DOI: 10.1016/j.tiv.2011.11.009] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2010] [Revised: 11/12/2011] [Accepted: 11/14/2011] [Indexed: 12/28/2022]
Abstract
In the present work, we evaluated the potential toxic effects of nerolidol, a sesquiterpenoid common in plants essential oils, both on mitochondrial and cellular energetics. Samples of enriched natural extracts of nerolidol (a racemic mixture of cis and trans isomers) were tested on rat liver mitochondria and a decrease in phosphorylative system was observed but not in the mitochondrial respiratory chain activity, which reflects a direct effect on F1-ATPase. Hence, respiratory control ratio was also decreased. Cellular ATP/ADP levels were significantly decreased in a concentration-dependent manner, possibly due to the direct effect of nerolidol on F(0)F(1)-ATPsynthase. Nerolidol stimulates respiratory activity probably due to an unspecific effect, since it does not show any protonophoric effect. Furthermore, we observed that mitochondrial permeability transition was delayed in the presence of nerolidol, possibly due to its antioxidant activity and because this compound decreases mitochondrial transmembrane electric potential. Our results also show that, in human hepatocellular liver carcinoma cell line (HepG2), nerolidol both induces cell death and arrests cell growth, probably related with the observed lower bioenergetic efficiency.
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Affiliation(s)
- Fernanda M Ferreira
- CERNAS, Department of Environment, Agricultural College of Coimbra, Coimbra, Portugal
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Carvalho AC, Paiva SM, Scarpelli AC, Viegas CM, Ferreira FM, Pordeus IA. Prevalence of malocclusion in primary dentition in a population-based sample of Brazilian preschool children. Eur J Paediatr Dent 2011; 12:107-111. [PMID: 21668282] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
AIM The purpose of the present study was to assess the prevalence of malocclusion in the primary dentition in a randomised representative sample of Brazilian preschool children. MATERIALS AND METHODS A cross-sectional survey was carried out in Belo Horizonte, Brazil, involving 1069 male and female preschool children from 60 to 71 months of age, randomly selected from public and private preschools and daycare centers. A questionnaire addressing demographic data was sent to parents/guardians in order to characterise the sample. The oral examination of the children was performed by a single, previously calibrated dentist (kappa inter-examiner agreement value = 0.82). The criterion for the categorisation of malocclusion was at least one of the following conditions: posterior crossbite, overjet (> 2 mm), anterior crossbite, anterior open bite and deep overbite. Univariate analysis was performed using the SPSS software RESULTS The prevalence of malocclusion was 46.2%. Deep overbite was the most prevalent alteration (19.7% of the sample). Posterior crossbite was diagnosed in 13.1% of the children; 10.5% had accentuated overjet; 7.9% had anterior open bite; and 6.7% had anterior crossbite. CONCLUSION Malocclusion in primary dentition is becoming a significant problem. The prevalence in the present study was high, especially vertical and transversal malocclusions.
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Affiliation(s)
- A C Carvalho
- Department of Pediatric Dentistry and Orthodontics, School of Dentistry, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
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Ferreira FM, Peixoto F, Nunes E, Sena C, Seiça R, Santos MS. "MitoTea": Geranium robertianum L. decoctions decrease blood glucose levels and improve liver mitochondrial oxidative phosphorylation in diabetic Goto-Kakizaki rats. Acta Biochim Pol 2010. [DOI: 10.18388/abp.2010_2424] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Several chemical compounds found in plant products have proven to possess beneficial properties, being currently pointed out due to their pharmacological potential in type 2 diabetes mellitus complications. In this context, we studied the effect of Geranium robertianum L. (herb Robert) leaf decoctions in Goto-Kakizaki (GK) rats, a model of type 2 diabetes. Our results showed that oral administration of G. robertianum leaf decoctions over a period of four weeks lowered the plasma glucose levels in diabetic rats. Furthermore, the treatment with G. robertianum extracts improved liver mitochondrial respiratory parameters (state 3, state 4 and FCCP-stimulated respiration) and increased oxidative phosphorylation efficiency.
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Ferreira FM, Peixoto F, Nunes E, Sena C, Seiça R, Santos MS. "MitoTea": Geranium robertianum L. decoctions decrease blood glucose levels and improve liver mitochondrial oxidative phosphorylation in diabetic Goto-Kakizaki rats. Acta Biochim Pol 2010; 57:399-402. [PMID: 21046015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2010] [Revised: 10/08/2010] [Accepted: 10/22/2010] [Indexed: 05/30/2023]
Abstract
Several chemical compounds found in plant products have proven to possess beneficial properties, being currently pointed out due to their pharmacological potential in type 2 diabetes mellitus complications. In this context, we studied the effect of Geranium robertianum L. (herb Robert) leaf decoctions in Goto-Kakizaki (GK) rats, a model of type 2 diabetes. Our results showed that oral administration of G. robertianum leaf decoctions over a period of four weeks lowered the plasma glucose levels in diabetic rats. Furthermore, the treatment with G. robertianum extracts improved liver mitochondrial respiratory parameters (state 3, state 4 and FCCP-stimulated respiration) and increased oxidative phosphorylation efficiency.
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Affiliation(s)
- Fernanda M Ferreira
- Department of Environment, Agricultural College of Coimbra - Polytechnic Institute of Coimbra, Bencanta, Portugal.
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Viegas CM, Scarpelli AC, Carvalho AC, Ferreira FM, Pordeus IA, Paiva SM. Predisposing factors for traumatic dental injuries in Brazilian preschool children. Eur J Paediatr Dent 2010; 11:59-65. [PMID: 20635838] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
AIM The aim of the present study was to assess the prevalence of traumatic dental injury (TDI) in primary teeth and determine predisposing factors. MATERIALS AND METHODS A cross-sectional study was carried out on 388 male and female Brazilian preschool children between 60 and 71 months of age. A questionnaire addressing demographic data and history of TDI was sent to parents/caregivers. Socioeconomic status was determined using the Social Vulnerability Index (SVI), family income, number of people in the household and parents/caregivers' schooling. The chi-square test was used for the statistical analysis. RESULTS The prevalence of TDI was 62.1%; 61.7% of the teeth were affected by enamel fracture. Statistically significant associations were found between TDI and increased overjet [OR = 2.24, 95% CI = 1.11- 4.55] and anterior crossbite [OR = 0.38, 95% CI=0.17-0.87]. No statistically significant associations were found between TDI and number of people in the household, family income, social vulnerability, parents/caregivers' schooling, lip competence, overbite, anterior open bite and dental caries (p>0.05). CONCLUSION The prevalence of TDI was high and enamel fracture was the most common sign of TDI. Children with an increased overjet suffer more TDIs. Socioeconomic factors had no influence over the prevalence of TDI.
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Affiliation(s)
- C M Viegas
- Department of Paediatric Dentistry and Orthodontics, Faculty of Dentistry, Federal University of Minas Gerais, Belo Horizonte, Brazil.
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Lameira AP, Gawryszewski LG, Guimarães-Silva S, Ferreira FM, Vargas CD, Umiltà C, Pereira A. Hand posture effects on handedness recognition as revealed by the simon effect. Front Hum Neurosci 2009; 3:59. [PMID: 20011220 PMCID: PMC2791032 DOI: 10.3389/neuro.09.059.2009] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [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: 08/13/2009] [Accepted: 11/15/2009] [Indexed: 11/30/2022] Open
Abstract
We investigated the influence of hand posture in handedness recognition, while varying the spatial correspondence between stimulus and response in a modified Simon task. Drawings of the left and right hands were displayed either in a back or palm view while participants discriminated stimulus handedness by pressing either a left or right key with their hands resting either in a prone or supine posture. As a control, subjects performed a regular Simon task using simple geometric shapes as stimuli. Results showed that when hands were in a prone posture, the spatially corresponding trials (i.e., stimulus and response located on the same side) were faster than the non-corresponding trials (i.e., stimulus and response on opposite sides). In contrast, for the supine posture, there was no difference between corresponding and non-corresponding trials. Control experiments with the regular Simon task showed that the posture of the responding hand had no influence on performance. When the stimulus is the drawing of a hand, however, the posture of the responding hand affects the spatial correspondence effect because response location is coded based on multiple reference points, including the body of the hand.
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Martins MT, Ferreira FM, Oliveira AC, Paiva SM, Vale MP, Allison PJ, Pordeus IA. Preliminary validation of the Brazilian version of the Child Perceptions Questionnaire 8-10. Eur J Paediatr Dent 2009; 10:135-140. [PMID: 19761288] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
AIM The aim of the study was to perform a preliminary validation of the Brazilian version of the Child Perceptions Questionnaire 8-10 (CPQ 8-10). METHODS The sample used to test the measurement equivalence was made up of 59 children from 8 to 10 years of age at the Federal University of Minas Gerais, Brazil. The CPQ 8-10 was administered, and clinical exams were performed by a single examiner, calibrated for the diagnosis of dental caries (Kappa= 0.98) and malocclusion (weighted Kappa and intraclass correlation coefficient = 0.66-1.00). The children were divided into three groups according to their clinical condition (22 with cavitated carious lesions; 20 with malocclusion; 17 with both oral conditions). STATISTICS The internal consistency of the instrument was assessed by Cronbach's alpha Coefficient. The Intraclass correlation coefficient (ICC) was used for the test-retest reliability (40 children). Discriminant validity was determined using the Kruskal-Wallis test. RESULTS An assessment of the psychometric properties revealed the instrument to be reliable (Cronbach's alpha=0.92 for the total scale and 0.63-0.85 for the subscales), exhibiting excellent stability (ICC=0.96 for the total scale and 0.79-0.95 for the subscales). Construct validity was demonstrated through the significant correlations between the global indicators and subscales. There were statistically significant differences between the clinical groups regarding the total scale, thereby demonstrating discriminant validity (p=0.03). CONCLUSIONS The preliminary validation of the Brazilian version of the CPQ 8-10 showed valid and reliable for use on Brazilian children.
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Affiliation(s)
- M T Martins
- Department of Paediatric Dentistry and Orthodontics, Faculty of Dentistry, Federal University of Minas Gerais, Belo Horizonte, Brazil
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Abstract
Several studies have been carried out to evaluate the alterations in mitochondrial functions of diabetic rats. However, some of the results reported are controversial, since experimental conditions, such as aging, and/or strain of animals used were different. The purpose of this study was to evaluate the metabolic changes in liver mitochondria, both in the presence of severe hyperglycaemia (STZ-treated rats) and mild hyperglycaemia (Goto-Kakizaki (GK) rats). Moreover, metabolic alterations were evaluated both at initial and at advanced states of the disease. We observed that both models of type 1 and type 2 diabetes presented alterations on respiratory chain activity. Because of continual severe hyperglycaemia, 9 weeks after the induction of diabetes, the respiratory function declined in STZ-treated rats, as observed by membrane potential and respiratory ratios (RCR, P/O, and FCCP-stimulated respiration) assessment. In contrast, GK rats of 6 months age presented increased respiratory ratios. To localize which respiratory complexes are affected by diabetes, enzymatic respiratory chain activities were evaluated. We observed that succinate dehydrogenase and cytochrome c oxidase activities were significantly augmented both in STZ-treated rats and GK rats of 6 months age. Moreover, H(+)-ATPase activity was also significantly increased in STZ-treated rats with 3 weeks of diabetes and in GK rats of 6 months age as compared to controls. Therefore, these results clearly suggest that both animal models of diabetes present some metabolic adjustments in order to circumvent the deleterious effects promoted by the high glucose levels typical of the disease.
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Affiliation(s)
- Fernanda M Ferreira
- Department of Zoology, Center for Neurosciences and Cell Biology, University of Coimbra, 3004-517 Coimbra, Portugal
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Ferreira FM, Seiça R, Oliveira PJ, Coxito PM, Moreno AJ, Palmeira CM, Santos MS. Diabetes induces metabolic adaptations in rat liver mitochondria: role of coenzyme Q and cardiolipin contents. Biochim Biophys Acta Mol Basis Dis 2003; 1639:113-20. [PMID: 14559118 DOI: 10.1016/j.bbadis.2003.08.001] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.0] [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: 11/17/2022]
Abstract
Several studies have been carried out to evaluate the alterations in mitochondrial functions of diabetic rats. However, results are sometimes controversial, since experimental conditions diverge, including age and strain of used animals. The purpose of this study was to evaluate the metabolic modifications in liver mitochondria, both in the presence of severe (STZ-treated rats) and mild hyperglycaemia [Goto-Kakizaki (GK) rats], when compared with control animals of similar age. Moreover, metabolic alterations were evaluated also at initial and advanced stages of the disease. We observed that both models of diabetes (type 1 and type 2) presented a decreased susceptibility of liver mitochondria to the induction of permeability transition (MPT). Apparently, there is a positive correlation between the severity of diabetes mellitus (and duration of the disease) and the decline in the susceptibility to MPT induction. We also found that liver mitochondria isolated from diabetic rats presented some metabolic adaptations, such as an increase in coenzyme Q and cardiolipin contents, that can be responsible for the observed decrease in the susceptibility to multiprotein pore (MPTP) opening.
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Affiliation(s)
- Fernanda M Ferreira
- Department of Zoology, University of Coimbra, Center for Neuroscience and Cell Biology of Coimbra, 3004-517 Coimbra, Portugal
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Palmeira CM, Ferreira FM, Rolo AP, Oliveira PJ, Santos MS, Moreno AJ, Cipriano MA, Martins MI, Seiça R. Histological changes and impairment of liver mitochondrial bioenergetics after long-term treatment with alpha-naphthyl-isothiocyanate (ANIT). Toxicology 2003; 190:185-96. [PMID: 12927374 DOI: 10.1016/s0300-483x(03)00163-x] [Citation(s) in RCA: 14] [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: 02/05/2023]
Abstract
This study was designed to evaluate the effects of long-term treatment with alpha-naphthyl-isothiocyanate (ANIT) on liver histology and at the mitochondrial bioenergetic level. Since, ANIT has been used as a cholestatic agent and it has been pointed out that an impairment of mitochondrial function is a cause of hepatocyte dysfunction leading to cholestatic liver injury, serum markers of liver injury were measured and liver sections were analyzed in ANIT-treated rats (i.p. 80 mg/kg/week x 16 weeks). Mitochondrial parameters such as transmembrane potential, respiration, calcium capacity, alterations in permeability transition susceptibility and ATPase activity were monitored. Histologically, the most important features were the marked ductular proliferation, proliferation of mast cells and the presence of iron deposits in ANIT-treated liver. Mitochondria isolated from ANIT-treated rats showed no alterations in state 4 respiration, respiratory control ratio and ADP/O ratio, while state 3 respiration was significantly decreased. No changes were observed on transmembrane potential, but the repolarization rate was decreased in treated rats. Consistently with these data, there was a significant decrease in the ATPase activity of treated mitochondria. Associated with these parameters, mitochondria from treated animals exhibited increased susceptibility to mitochondrial permeability transition pore opening (lower calcium capacity). Since, human cholestatic liver disease progress slowly overtime, these data provide further insight into the role of mitochondrial dysfunction in the process.
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Affiliation(s)
- Carlos M Palmeira
- Department of Zoology, Center for Neurosciences and Cell Biology, University of Coimbra, 3004-517 Coimbra, Portugal.
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Ferreira FM, Oliveira PJ, Rolo AP, Santos MS, Moreno AJ, da Cunha MF, Seiça R, Palmeira CM. Cholestasis induced by chronic treatment with alpha-naphthyl-isothiocyanate (ANIT) affects rat renal mitochondrial bioenergetics. Arch Toxicol 2003; 77:194-200. [PMID: 12698234 DOI: 10.1007/s00204-003-0441-3] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2002] [Accepted: 01/15/2003] [Indexed: 10/20/2022]
Abstract
Chronic cholestasis is characteristic of many human liver diseases. Renal injury has been often associated with this type of disease. The aim of this study was to evaluate the effect of cholestasis on kidney mitochondrial bioenergetics following in vivo chronic administration of alpha-naphthyl-isothiocyanate (ANIT), a known cholestatic agent. Serum markers of renal injury, kidney morphology and endogenous adenine nucleotides were measured in ANIT-treated rats (80 mg/kg per week s.c. for 16 weeks). Changes in membrane potential and mitochondrial respiration as well as alterations in mitochondrial calcium homeostasis were monitored. Cholestatic animals shown no alterations in renal morphology when compared with control. Additionally, following chronic ANIT administration, no significant alterations in mitochondrial respiratory function have been shown. The phosphorylation capacity of cholestatic kidney mitochondria was enhanced. Associated with these parameters, mitochondria from treated animals exhibited a decreased susceptibility to disruption of mitochondrial calcium homeostasis, due to permeability transition induction. These data suggest that, despite being submitted to chronic treatment with ANIT, kidney mitochondria from cholestasis-induced rats present some defense mechanisms to circumvent this aggression. They show improved phosphorylative capacity and, moreover, a decreased susceptibility to mitochondrial permeability transition induction, probably due to adaptative mechanisms of calcium transport.
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Affiliation(s)
- F M Ferreira
- Center for Neurosciences and Cell Biology, Department of Zoology, University of Coimbra, 3004-517, Coimbra, Portugal
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35
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Ferreira FM, Matos JS, Rodrigues AC, do Monte HM. Performance of partially separate sewer systems and impacts on receiving waters. Water Sci Technol 2002; 45:273-279. [PMID: 11905442] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
The aim of this document is to present and discuss the results of the experimental work undertaken in Laje stream, in a section near the village of Oeiras in Portugal. The work was developed with the main objective of characterising stormwater quality in Portuguese drainage systems, and to predict the effects of the performance of partially separate sewer systems on receiving waters. For this purpose, volume and characteristics of stormwater carried by a partially separated sewer system were estimated, both in terms of flow and Chemical Oxygen Demand (COD) loads. The study also analyses the eventual implementation of non-conventional solutions, as a way of reducing problems of bacteriological contamination of seawaters. This aspect is particularly important in Portugal, where the population is mainly concentrated in urban areas located down-stream of important drainage basins, close to the coastline. Therefore, sanitary sewer overflows discharging directly into receiving waters are frequent, with possible consequences in terms of bacteriological contamination of bathing areas. Based on experimental research and available data it was possible to collect informations regarding stormwater average COD and overflow coliform loads, and the occurrence of first flush effects.
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Affiliation(s)
- F M Ferreira
- Instituto Politécnico de Setúbal. R. Stinville, Barreiro, Portugal
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36
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Ferreira FM, Bezerra L, Santos MB, Bernardes RM, Avelino I, Silva ML. Intestinal microsporidiosis: a current infection in HIV-seropositive patients in Portugal. Microbes Infect 2001; 3:1015-9. [PMID: 11580988 DOI: 10.1016/s1286-4579(01)01465-4] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.0] [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: 11/23/2022]
Abstract
Intestinal microsporidiosis is recognised as an important cause of opportunistic infections in immunocompromised patients, especially those with AIDS. Two species are implicated in diarrhoea and other gastrointestinal disease in HIV-infected patients: Enterocytozoon bieneusi and Encephalitozoon intestinalis. Diagnosis of gastrointestinal microsporidiosis was made by detecting spores of the parasite in stool specimens with Weber's modified trichrome stain and with some optical brightening agents such as UVITEX 2B or calcofluor white M2R. The identification of microsporidiosis at the species level was made using appropriate primers with PCR. The diagnosis of intestinal microsporidiosis is currently performed in the parasitology laboratory. In a study of 215 HIV-infected patients, conducted from 1996 to 1999 (approximately n = 60/year), we found a prevalence of spores of microsporidia of 51.5% (n = 31) in 1996, 14.0% (n = 5) in 1997 and 12.5% (n = 8) in 1998 and 42.8% (n = 25) in 1999. Using PCR we found that E. intestinalis was the only species responsible for the gastrointestinal symptoms in 49 patients with microsporidian spores (71%) and E. bieneusi in 29% (n = 20).
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Affiliation(s)
- F M Ferreira
- Laboratório de Microbiologia de Aguas/Laboratório de Parasitologia, Instituto Nacional de Saúde Dr. Ricardo Jorge, INSA (National Health Institute), Largo 1st de Dezembro, 4000 Porto, Portugal.
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Ferreira FM, Franco Soler JM, Fidalgo ML, Fernández-Vila P. PSP toxins from Aphanizomenon flos-aquae (cyanobacteria) collected in the Crestuma-Lever reservoir (Douro river, northern Portugal). Toxicon 2001; 39:757-61. [PMID: 11137533 DOI: 10.1016/s0041-0101(00)00114-8] [Citation(s) in RCA: 76] [Impact Index Per Article: 3.3] [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: 10/17/2022]
Abstract
The presence of paralytic shellfish poisoning (PSP) toxins in cultures of Aphanizomenon flos-aquae, isolated from the Crestuma-Lever reservoir, was found by reversed phase high performance liquid chromatography employing two isocratic elution systems for the separation of PSP toxins. With the first isocratic elution protocol, the presence of apolar toxins as saxitoxin, decarbamoyl saxitoxin and neosaxitoxin not detected. On the other hand, GTX4, GTX1 and GTX3 as well as Cs toxins were present either in the Aphanizomenon flos-aquae cells collected directly from the bloom or in the other toxic isolates priorly cultivated in laboratory conditions.
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Affiliation(s)
- F M Ferreira
- Laboratory de Parasitologia, Instituto Nacional de Saúde Dr. Ricardo Jorge, Largo 1 de Dezembro, 4000 Porto, Portugal.
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38
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Ferreira FM, Mendoza-Hernández G, Calcagno ML, Minauro F, Delboni LF, Oliva G. Crystallization and preliminary crystallographic analysis of N-acetylglucosamine 6-phosphate deacetylase from Escherichia coli. Acta Crystallogr D Biol Crystallogr 2000; 56:670-2. [PMID: 10771446 DOI: 10.1107/s0907444900003668] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
N-Acetylglucosamine 6-phosphate deacetylase (E.C. 3.5.1.25), an enzyme from Escherichia coli involved in aminosugar catabolism, has been crystallized by the vapour-diffusion technique using phosphate as precipitant. X-ray diffraction experiments show the crystals to belong to the orthorhombic crystal system, with space group P2(1)2(1)2. The unit-cell parameters are a = 82.09 (2), b = 114.50 (1), c = 80.17 (1) A. The crystals diffract to a maximum resolution of 1.8 A and an initial data set was collected to 2.0 A.
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Affiliation(s)
- F M Ferreira
- Laboratório de Cristalografia de Proteínas e Biologia Estrutural, Instituto de Física de São Carlos, Universidade de São Paulo, Av. Dr Carlos Botelho 1465, Caixa Postal 369, 13560--970 São Carlos SP, Brazil
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39
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Abstract
Type 2 diabetes mellitus is one of the most common chronic metabolic diseases in man. Due to long-term complications of the disease, severely decreasing the quality of life of diabetic patients, early interventions to obviate the risk of complications are of major importance. Therefore, diabetic animal models are of major importance in research for interventional treatment of type 2 diabetes. In this work we investigated the possible alterations in mitochondrial energetic metabolism of Goto-Kakizaki (GK) rats during the progression of the disease, since glucose metabolism is closely related to intracellular ATP content. For that reason, respiratory indexes (state 4, state 3, RCR and ADP/O) were evaluated either in the presence of NAD- or FAD-linked substrates (glutamate + malate and succinate, respectively) in mitochondrial preparations of GK and control rats with 8, 12, 26 and 52 weeks of age. Until the age of 1 year (52 weeks) we found no impairment of mitochondrial respiratory indexes both in the presence of glutamate + malate and succinate. In conclusion, this study indicates that GK rat is a good model for studying the initial events of diabetes, since it presents no impairment of liver mitochondrial functions during the first year of life, contrasting clearly with pharmacological induced diabetes.
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Affiliation(s)
- F M Ferreira
- Department of Zoology, Center for Neurosciences and Cell Biology, University of Coimbra, 3004-517 Coimbra, Portugal
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40
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Ferreira FM, Palmeira CM, Matos MJ, Seiça R, Santos MS. Decreased susceptibility to lipid peroxidation of Goto-Kakizaki rats: relationship to mitochondrial antioxidant capacity. Life Sci 1999; 65:1013-25. [PMID: 10499869 DOI: 10.1016/s0024-3205(99)00332-x] [Citation(s) in RCA: 27] [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: 11/20/2022]
Abstract
The respiratory function and the antioxidant capacity of liver mitochondrial preparations isolated from Goto-Kakizaki non-insulin dependent diabetic rats and from Wistar control rats, with the age of 6 months, were compared. It was found that Goto-Kakizaki mitochondrial preparations presented a higher coupling between oxidative and phosphorylative systems, compared to non-diabetic preparations. Goto-Kakizaki mitochondria presented a lower susceptibility to lipid peroxidation induced by ADP/Fe2+, as evaluated by the formation of thiobarbituric acid substances. The decreased susceptibility to peroxidation in diabetic rats was correlated with an increase in mitochondrial vitamin E (alpha-tocopherol) content and GSH/GSSG ratio. Moreover, the glutathione reductase activity was significantly increased, whereas the glutathione peroxidase was decreased. Superoxide dismutase activity was unchanged in diabetic rats. Fatty acid analyses showed that the content in polyunsaturated fatty acids of Goto-Kakizaki mitochondrial membranes was significantly higher compared to controls. These results indicate that the lower susceptibility to lipid peroxidation of mitochondria from diabetic rats was related to their antioxidant defense systems, and may correspond to an adaptative response of the cells against oxidative stress in the early phase of diabetes.
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Affiliation(s)
- F M Ferreira
- Center for Neurosciences of Coimbra, Department of Zoology, University of Coimbra, Portugal.
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41
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Palmeira CM, Ferreira FM, Santos DL, Ceiça R, Suzuki K, Santos MS. Higher efficiency of the liver phosphorylative system in diabetic Goto-Kakizaki (GK) rats. FEBS Lett 1999; 458:103-6. [PMID: 10481045 DOI: 10.1016/s0014-5793(99)01144-8] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
Liver mitochondrial bioenergetics of Goto-Kakizaki (GK) rats (a model of non-insulin dependent diabetes mellitus) reveals a Delta Psi upon energization with succinate significantly increased relatively to control animals. The repolarization rate following ADP phosphorylation is also significantly increased in GK mitochondria in parallel with increased ATPase activity. The increase in the repolarization rate and ATPase activity is presumably related to an improved efficiency of F(0)F(1)-ATPase, either from a better phosphorylative energy coupling or as a consequence of an enlarged number of catalytic units. Titrations with oligomycin indicate that diabetic GK liver mitochondria require excess oligomycin pulses to completely abolish phosphorylation, relative to control mitochondria. Therefore, accepting that the number of operational ATP synthase units is inversely proportional to the amount of added oligomycin, it is concluded that liver mitochondria of diabetic GK rats are provided with extra catalytic units relative to control mitochondria of normal rats. Other tissues (kidney, brain and skeletal muscle) were evaluated for the same bioenergetic parameters, confirming that this feature is exclusive to liver from diabetic GK rats.
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MESH Headings
- Adenosine Triphosphatases/metabolism
- Animals
- Brain/enzymology
- Brain/physiology
- Diabetes Mellitus, Type 2/enzymology
- Diabetes Mellitus, Type 2/genetics
- Diabetes Mellitus, Type 2/metabolism
- Energy Metabolism
- Kidney/enzymology
- Kidney/physiology
- Male
- Membrane Potentials/drug effects
- Mitochondria, Liver/enzymology
- Mitochondria, Liver/metabolism
- Mitochondria, Liver/physiology
- Mitochondria, Muscle/enzymology
- Mitochondria, Muscle/physiology
- Oligomycins/pharmacology
- Phosphorylation
- Rats
- Rats, Inbred Strains
- Rats, Wistar
- Substrate Specificity
- Titrimetry
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Affiliation(s)
- C M Palmeira
- Department of Zoology, Center for Neurosciences of Coimbra, University of Coimbra, 3004-517, Coimbra, Portugal.
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Abstract
Respiratory indexes and the transmembrane electrical potential (delta psi) were evaluated in mitochondrial preparations from 6-month-old Goto-Kakizaki (GK) and Wistar rats in the presence of glutamate + malate and succinate. We found that in diabetic GK mitochondria, flavin adenine dinucleotide (FAD)-linked respiratory indexes (respiratory control ratio [RCR] and adenosine diphosphate [ADP] to oxygen ratio [ADP/O]) are increased and uncoupled respiration is largely enhanced, indicating increased respiratory chain activity in GK rats. Delta psi development in GK mitochondrial preparations, energized using glutamate + malate or succinate as substrates, and the repolarization rate upon phosphorylation of the added ADP were significantly higher in GK mitochondrial preparations. These results indicate an enhanced activity of the phosphorylation system, confirmed by evaluating delta psi development when the mitochondria are energized by adenosine triphosphate (ATP). Moreover, recovery of the potential upon a phosphorylative cycle is increased in GK mitochondria, reflecting a more efficient coupling between the phosphorylative and oxidative system. Contrasting with results obtained for alloxan- or streptozotocin-induced diabetic rats, this study clearly demonstrates no impairment of mitochondrial bioenergetics in diabetic GK rats. On the contrary, at this age, we observed a higher efficiency of the phosphorylation system as compared with Wistar rats.
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Affiliation(s)
- F M Ferreira
- Department of Zoology and the Faculty of Medicine, Center for Neurosciences of Coimbra, University of Coimbra, Portugal
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Abstract
The effects of DDE (2,2-bis(p-chlorophenyl)-1,1-dichloroethylene), the major metabolite of DDT (2,2-bis(p-chlorophenyl)-1,1,1-trichloroethane), on rat liver mitochondrial bioenergetic activities were examined. The approach developed by M. D. Brand (Biochim Biophys Acta 1018: 128-133, 1990) was used to assess the effects of DDE because it is possible to discriminate the sites of action of compounds having pleiotypic effects on oxidative phosphorylation. Data were further confirmed using a "classical" approach, including measurements of transmembrane potential, respiratory indexes, enzymatic activities and membrane permeability to protons. DDE up to 40 nmol/mg protein affected the proton motive force generating system. In fact, DDE interacted with succinate dehydrogenase (complex II), decreasing respiration and membrane potential. In this concentration range, the permeability of the inner membrane to protons remained intact. Only higher concentrations (> or = 80 nmol/mg) increased permeability to protons, uncoupling oxidation from phosphorylation. The phosphorylative system was not affected because the rate of ATP synthesis was unchanged. In addition, data from carbonyl cyanide m-chlorophenylhydrazone-uncoupled rotenone-inhibited preparations or submitochondrial particles indicated that F0F1 ATPase activity is not affected by DDE. Therefore, DDE inhibition of complex II and putative inhibition of succinate translocation explain the depression of mitochondrial respiration. The use of appropriate substrates and assay conditions indicates that complexes I, III and IV were not affected by DDE. The uncoupling of oxidative phosphorylation at high concentrations (> 80 nmol DDE/mg protein) was probably related to deleterious effects on the integrity of the mitochondrial membrane. We confirmed that the technique originally proposed by Brand is useful for characterizing the effects of xenobiotics on oxidative phosphorylation. In addition, data provided by this technique closely agree with data from classical studies.
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Affiliation(s)
- F M Ferreira
- Department of Zoology, University of Coimbra, Portugal
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Ferreira FM, Santos E, Carvalbo A, Pires J. [Clinical correlations of Mönckeberg's medial calcinosis in diabetes mellitus]. ACTA MEDICA PORT 1981; 3:267-79. [PMID: 7331884] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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45
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Bozza A, de Britto AH, Malagrino A, Nogueira A, Besen D, Santos DV, Di Piero EF, Ferreira FM, Gomes FJ, de Brito FS, Dohmann H, Arroyo JB, Batlouni M, Wagner M, Studart PC, Duprat R, Federico W. [Perhexiline maleate in a multicentric study in Brazil - a new model of a clinical protocol and mechanism of action of the drug]. Arq Bras Cardiol 1979; 32:263-8. [PMID: 389211] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
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46
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Ferreira FM, Ferreira M, Mendes L. [Kallmann-De Morsier's syndrome]. Rev Iber Endocrinol 1974; 21:365-77. [PMID: 4548943] [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: 01/11/2023]
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47
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Ferreira FM. [Physiology of calcium, especially in hypocalcemia. (Review of literature)]. J Med (Oporto) 1965; 58:758-67. [PMID: 5321739] [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: 01/14/2023]
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