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Oliveira LS, Avelino KYPS, Oliveira SRDE, Lucena-Silva N, de Oliveira HP, Andrade CAS, Oliveira MDL. Flexible genosensors based on polypyrrole and graphene quantum dots for PML/RARα fusion gene detection: A study of acute promyelocytic leukemia in children. J Pharm Biomed Anal 2023; 235:115606. [PMID: 37544275 DOI: 10.1016/j.jpba.2023.115606] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2023] [Revised: 07/17/2023] [Accepted: 07/25/2023] [Indexed: 08/08/2023]
Abstract
Acute promyelocytic leukemia (APL) in children is associated with a favorable initial prognosis. However, minimal residual disease (MRD) follow-up remains poorly defined, and relapse cases are concerning due to their recurrent nature. Thus, we report two electrochemical flexible genosensors based on polypyrrole (PPy) and graphene quantum dots (GQDs) for label-free PML-RARα oncogene detection. Atomic force microscopy (AFM), scanning electron microscope (SEM), cyclic voltammetry (CV), and electrochemical impedance spectroscopy (EIS) were used to characterize the technological biosensor development. M7 and APLB oligonucleotide sequences were used as bioreceptors to detect oncogenic segments on chromosomes 15 and 17, respectively. AFM characterization revealed heterogeneous topographical surfaces with maximum height peaks for sensor layers when tested with positive patient samples. APLB/Genosensor exhibited a percentage change in anode peak current (ΔI) of 423 %. M7/Genosensor exhibited a ΔI of 61.44 % for more concentrated cDNA samples. The described behavior is associated with the biospecific recognition of the proposed biosensors. Limits of detection (LOD) of 0.214 pM and 0.677 pM were obtained for APLB/Genosensor and M7/Genosensor, respectively. The limits of quantification (LOQ) of 0.648 pM and 2.05 pM were estimated for APLB/Genosensor and M7/Genosensor, respectively. The genosensors showed reproducibility with a relative standard deviation of 7.12 % for APLB and 1.18 % for M7 and high repeatability (9.89 % for APLB and 1.51 % for M7). In addition, genetic tools could identify the PML-RARα oncogene in purified samples, plasmids, and clinical specimens from pediatric patients diagnosed with APL with high bioanalytical performance. Therefore, biosensors represent a valuable alternative for the clinical diagnosis of APL and monitoring of MRD with an impact on public health.
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Affiliation(s)
- Léony S Oliveira
- Programa de Pós-Graduação em Inovação Terapêutica, Universidade Federal de Pernambuco, 50670-901 Recife, PE, Brazil; Laboratório de Biodispositivos Nanoestruturados, Departamento de Bioquímica, Universidade Federal de Pernambuco, 50670-901 Recife, PE, Brazil
| | - Karen Y P S Avelino
- Programa de Pós-Graduação em Inovação Terapêutica, Universidade Federal de Pernambuco, 50670-901 Recife, PE, Brazil; Laboratório de Biodispositivos Nanoestruturados, Departamento de Bioquímica, Universidade Federal de Pernambuco, 50670-901 Recife, PE, Brazil
| | - Sevy R D E Oliveira
- Laboratório de Biodispositivos Nanoestruturados, Departamento de Bioquímica, Universidade Federal de Pernambuco, 50670-901 Recife, PE, Brazil
| | - Norma Lucena-Silva
- Instituto Aggeu Magalhães, Fundação Oswaldo Cruz (Fiocruz), 50670-420 Recife, PE, Brazil; Laboratório de Biologia Molecular, Departamento de Oncologia Pediátrica, Instituto de Medicina Integral Professor Fernando Figueira (IMIP), 50070-550 Recife, PE, Brazil
| | - Helinando P de Oliveira
- Institute Pesquisa em Ciência dos Materiais, Universidade Federal do Vale do São Francisco, Juazeiro, Brazil
| | - Cesar A S Andrade
- Programa de Pós-Graduação em Inovação Terapêutica, Universidade Federal de Pernambuco, 50670-901 Recife, PE, Brazil; Laboratório de Biodispositivos Nanoestruturados, Departamento de Bioquímica, Universidade Federal de Pernambuco, 50670-901 Recife, PE, Brazil
| | - Maria D L Oliveira
- Programa de Pós-Graduação em Inovação Terapêutica, Universidade Federal de Pernambuco, 50670-901 Recife, PE, Brazil; Laboratório de Biodispositivos Nanoestruturados, Departamento de Bioquímica, Universidade Federal de Pernambuco, 50670-901 Recife, PE, Brazil.
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Silva FA, Luz ACON, Catto LFB, Oliveira LS, Ferreira CGQ, Fischer WGG, Catto MB, Fonseca PR, Lanza LB, Filho SLAP. LEUCEMIA ERITROIDE PURA: UM RELATO DE CASO. Hematol Transfus Cell Ther 2022. [DOI: 10.1016/j.htct.2022.09.308] [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: 11/07/2022] Open
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Ferreira CGQ, Oliveira LS, Cunha NCR, Silva FA, Lanza LB, Donadel CD, Fernandes SS, Morais ALL, Nogueira JH, Oliveira LC. RELATO DE CASO: TROMBOFLEBITE SUPERFICIAL EXTENSA EM PACIENTE PORTADOR DE HEMOFILIA A GRAVE ASSOCIADA À VACINA PARA COVID19. Hematol Transfus Cell Ther 2022. [DOI: 10.1016/j.htct.2022.09.494] [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: 11/05/2022] Open
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Sá AF, Correia LGO, Correia COA, Oliveira LS. IMATINIBE E HIPERTRIGLICERIDEMIA GRAVE: RELATO DE RARA ASSOCIAÇÃO. Hematol Transfus Cell Ther 2022. [DOI: 10.1016/j.htct.2022.09.391] [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: 11/05/2022] Open
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Oliveira LS, Ferreira CGQ, Nogueira JH, Luz ACON, Lanza LB, Cunha NCR, Fernandes SS, Silva FA, Costa VEF, Pinto ACS. RELATO DE CASO: NEFROPATIA FALCIFORME EM ADULTO JOVEM: EVOLUÇÃO DRAMÁTICA PARA DOENÇA RENAL CRÔNICA DIALÍTICA. Hematol Transfus Cell Ther 2022. [DOI: 10.1016/j.htct.2022.09.063] [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: 11/11/2022] Open
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Fernandes SS, Gonçalves TE, Fernandes LGG, Catto MB, Donadel CD, Oliveira LS, Ferreira CGQ, Lanza LB, Silva FA, Palma LC. VASCULITE CRIOGLOBULINÊMICA COMO EVENTO ÍNDICE NA MACROGLOBULINEMIA DE WALDENSTRÖM. Hematol Transfus Cell Ther 2022. [DOI: 10.1016/j.htct.2022.09.233] [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: 11/11/2022] Open
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Cunha NCR, Oliveira LS, Ferreira CGQ, Lanza LB, Silva FA, Luz ACON, Pacca RL, Cota LV, Fernandes SS, Santos FLS. DOENÇA HEMOLÍTICA POR AGLUTININA A FRIO: UM RELATO DE CASO. Hematol Transfus Cell Ther 2022. [DOI: 10.1016/j.htct.2022.09.075] [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: 11/06/2022] Open
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Y.P.S. Avelino K, Oliveira LS, Santos MR, Lucena-Silva N, Andrade CA, Oliveira MD. Electrochemical dna biosensor for chronic myelocytic leukemia based on hybrid nanostructure. Bioelectrochemistry 2022; 147:108176. [DOI: 10.1016/j.bioelechem.2022.108176] [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] [Received: 02/21/2022] [Revised: 06/03/2022] [Accepted: 06/04/2022] [Indexed: 11/30/2022]
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Cunha NCR, Pacca RL, Fernandes SS, Resende AHA, Oliveira LS, Bariani PCC, Filgueiras PL, Soares RMS, Palma LC. LINFOMA CUTÂNEO PRIMÁRIO DIFUSO DE GRANDES CÉLULAS B TIPO PERNA TRATADO COM R-MINI-CHOP. Hematol Transfus Cell Ther 2021. [DOI: 10.1016/j.htct.2021.10.136] [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: 11/25/2022] Open
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Fernandes SS, Garibaldi PMM, Resende AHA, Oliveira LS, Bariani PCC, Soares RMS, Melo RS, Luz ACON, Cunha NCR, Lanza LB. RECAÍDA DE MIELOMA MÚLTIPLO COM PLASMOCITOMA NODAL. Hematol Transfus Cell Ther 2021. [DOI: 10.1016/j.htct.2021.10.359] [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: 11/16/2022] Open
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Rizzo SRCP, Zanelli APRD, Sierra PC, Oliveira LS, Achê AP. EXECUÇÃO DE AUDITORIA INTERNACIONAL DE FORMA HIBRIDA DURANTE A PANDEMIA DO COVID-19. Hematol Transfus Cell Ther 2021. [PMCID: PMC8530586 DOI: 10.1016/j.htct.2021.10.935] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
Abstract
Garantir a segurança quanto ao risco de contaminação do COVID-19 durante um processo de auditoria híbrido, com auditores presenciais e on-line. Os efeitos gerados pela pandemia COVID-19, trouxe a necessidade de mudança e adaptação em vários conceitos de negócios e a execução de auditorias externas foi um deles. Tratando-se de um processo com avaliadores internacionais, os efeitos foram ainda maiores devido o fechamento de fronteiras, riscos de contaminação, entre outros itens conhecidos. A preocupação para execução deste procedimento foi garantir que as políticas e as boas práticas minimizassem a exposição a patógenos respiratórios, incluindo o SARS-CoV-2. Desta forma, tendo em vista a grande possibilidade de transmissibilidade, as medidas de prevenção e controle junto aos auditores deste processo foram implementadas em todas as etapas, desde a seleção de auditores pois alguns poderiam apresentar um risco acrescido devido a alguma comorbidade, hospedagem, deslocamento, orientação aos procedimentos a serem utilizados no serviço, durante toda a auditoria e até seu retorno. Estabelecer uma política de segurança durante a execução de visita de acreditação e reacreditação em serviços de bancos de sangue, serviços de transfusão e de terapia celular no padrão AABB/ABHH com auditores presenciais e on line. Padronizar protocolo de segurança, seleção de auditores que não apresentavam nenhuma comorbidade que pudesse acarretar em risco acrescido, treinamentos quanto ao novo fluxo e uso de Equipamentos de Proteção Individual (EPI), fluxo durante os deslocamentos, reuniões, refeições, hospedagem e todo o processo de auditoria. Avaliar a possibilidade de aceitação dos serviços quanto ao recebimento dos auditores presenciais e on line. Analisar a autorização de execução de auditor internacional de forma on lie pela AABB. Foi padronizada a política de segurança, elaboração de procedimento operacional e treinamento de todos os auditores antes da execução da auditoria. Executado levantamento de toda a segurança necessária para execução das visitas de acreditação e reacreditação nos serviços de bancos de sangue, serviços de transfusão e de terapia. Apresentado a política e o procedimento operacional a todos os serviços e com aceite de todos quanto a execução. Executado análise de saúde do auditor antes e durante e no término das auditorias. Implementado fluxo com uso de plataformas on-line para que os auditores internacionais pudessem avaliar os processos em tempo real. Execução de reunião de abertura, fechamento e durante avaliação entre auditores brasileiros e internacionais sem nenhum dano neste fluxo. Executado análise de todos os serviços quanto a mudança na execução de auditoria e o resultado quanto a aprovação foi unanime. Consideramos que a mudança foi necessária, com minimização de riscos, custos e desgastes e aumento quanto a confiabilidade de todos os serviços/clientes quanto a execução, podemos afirmar que este processo foi de caráter positivo e que permanecerá como uma segunda opção dentro deste ciclo. Com um protocolo de trabalho padronizado, testes validados e executados de forma controlada, todos os envolvidos orientados e respeitando os critérios de segurança garantimos que mesmo com um risco quanto a contaminação do COVID-19 todas as auditorias foram executadas de forma confiável tendo resultado de 100% quanto a segurança, confiabilidade, satisfação do cliente e de todos os participantes.
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Silva FA, Lanza LB, Lins LC, Cunha NCR, Pacca RL, Fernandes SS, Oliveira LS, Resende AHA, Garibaldi PMM. LINFOMA T INTESTINAL MONOMÓRFICO EPITELIOTRÓPICO NUMA IDOSA TRATADO COM O ESQUEMA CEOP (SEM VINCRISTINA). Hematol Transfus Cell Ther 2021. [DOI: 10.1016/j.htct.2021.10.152] [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: 10/20/2022] Open
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Resende AHA, Oliveira LS, Bariani PCC, Filgueiras PL, Soares RMS, Melo RS, Luz ACON, Silva FA, Pontes LLF, Madeira MIA. LEUCEMIA AGUDA DE FENÓTIPO MISTO COM T(9;22)(Q34.1;Q11.2); BCR-ABL1: UM RELATO DE CASO. Hematol Transfus Cell Ther 2021. [DOI: 10.1016/j.htct.2021.10.270] [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: 11/30/2022] Open
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Lanza LB, Cota LV, Cunha NCR, Pacca RL, Fernandes SS, Resende AHA, Oliveira LS, Bariani PCC, Palma LC. TOXICIDADE HEPATOCELULAR COMO EVENTO ADVERSO IMUNOMEDIADO SECUNDÁRIO AO USO DE NIVOLUMABE EM PACIENTE COM LINFOMA DE HODGKIN CLÁSSICO: RELATO DE CASO. Hematol Transfus Cell Ther 2021. [DOI: 10.1016/j.htct.2021.10.104] [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: 11/16/2022] Open
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Avelino KYPS, Oliveira LS, Lucena-Silva N, Andrade CAS, Oliveira MDL. Flexible sensor based on conducting polymer and gold nanoparticles for electrochemical screening of HPV families in cervical specimens. Talanta 2021; 226:122118. [PMID: 33676673 DOI: 10.1016/j.talanta.2021.122118] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2020] [Revised: 01/10/2021] [Accepted: 01/11/2021] [Indexed: 12/17/2022]
Abstract
Considering the low sensitivity of cytological exams and high costs of the molecular methods, the development of diagnostic tests for effective diagnosis of HPV infections is a priority. In this work, biosensor composed of polypyrrole (PPy) films and gold nanoparticles (AuNPs) was obtained for specific detection of HPV genotypes. The biosensor was developed by using flexible electrodes based on polyethylene terephthalate (PET) strips coated with indium tin oxide (ITO). Polymeric films and AuNPs were obtained by electrosynthesis. Oligonucleotides sequences modified with functional amino groups were designed to recognize HPV gene families strictly. The modified oligonucleotides were chemically immobilized on the nanostructured platform. Cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) were used for the analysis of the electrode modification and monitoring of molecular hybridization. Electrochemical changes were observed after exposure of the biosensors to plasmid samples and cervical specimens. The biosensor based on the BSH16 probe showed a linear concentration range for target HPV16 gene detection of 100 pg μL-1 to 1 fg μL-1. A limit of detection (LOD) of 0.89 pg μL-1 and limit of quantification (LOQ) of 2.70 pg μL-1 were obtained, with a regression coefficient of 0.98. Screening tests on cervical specimens were performed to evaluate the sensibility and specificity for HPV and its viral family. The expression of a biomarker for tumorigenesis (p53 gene) was also monitored. In this work, a flexible system has been successfully developed for label-free detection of HPV families and p53 gene monitoring with high specificity, selectivity, and sensitivity.
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Affiliation(s)
- Karen Y P S Avelino
- Programa de Pós-Graduação Em Inovação Terapêutica, Universidade Federal de Pernambuco, 50670-901, Recife, PE, Brazil; Laboratório de Biodispositivos Nanoestruturados, Departamento de Bioquímica, Universidade Federal de Pernambuco, 50670-901, Recife, PE, Brazil
| | - Léony S Oliveira
- Laboratório de Biodispositivos Nanoestruturados, Departamento de Bioquímica, Universidade Federal de Pernambuco, 50670-901, Recife, PE, Brazil
| | - Norma Lucena-Silva
- Instituto Aggeu Magalhães, Fundação Oswaldo Cruz (Fiocruz), 50670-420, Recife, PE, Brazil; Laboratório de Biologia Molecular, Departamento de Oncologia Pediátrica, Instituto de Medicina Integral Professor Fernando Figueira (IMIP), 50070-550, Recife, PE, Brazil
| | - César A S Andrade
- Programa de Pós-Graduação Em Inovação Terapêutica, Universidade Federal de Pernambuco, 50670-901, Recife, PE, Brazil; Laboratório de Biodispositivos Nanoestruturados, Departamento de Bioquímica, Universidade Federal de Pernambuco, 50670-901, Recife, PE, Brazil
| | - Maria D L Oliveira
- Programa de Pós-Graduação Em Inovação Terapêutica, Universidade Federal de Pernambuco, 50670-901, Recife, PE, Brazil; Laboratório de Biodispositivos Nanoestruturados, Departamento de Bioquímica, Universidade Federal de Pernambuco, 50670-901, Recife, PE, Brazil.
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Mituiassu LMP, Serdeiro MT, Vieira RRBT, Oliveira LS, Maleck M. Momordica charantia L. extracts against Aedes aegypti larvae. BRAZ J BIOL 2021; 82:e236498. [PMID: 33787746 DOI: 10.1590/1519-6984.236498] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2020] [Accepted: 06/19/2020] [Indexed: 11/22/2022] Open
Abstract
Mormodica charantia (Curcubitaceae) is a plant with great medicinal potential, also used as an alternative of mosquitoes control as demonstrated by previous studies. We evaluated the larvicidal activity of crude extracts of ethyl acetate, methanol and hexane from flowers and fruits of M. charantia against Aedes aegypti (Culicidae). Flowers and fruits were macerated in methanol, ethyl acetate and hexane. Bioassays were performed with application of the extracts at final concentrations of 1 - 200 µg/mL in the middle of the third instar larvae of A. aegypti (L3). The results showed high toxicity to ethyl acetate extracts from flowers and fruits at concentrations of 200 µg/mL and 100 µg/mL, with 97% and 87% of larvae mortality (L3), respectively. Hexane extract demonstrated low toxicity, while methanol extract exhibited 78% larval mortality. The data suggested that the ethyl acetate extracts of flowers and fruits of M. charantia can effectively contribute to larvicidal activity. In addition, purification of M. charantia extracts may lead to a promising larvicidal activity to control the A. aegypti population.
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Affiliation(s)
- L M P Mituiassu
- Universidade de Vassouras, Laboratório de Insetos Vetores, Vassouras, RJ, Brasil.,Universidade de Vassouras, Mestrado Profissional em Ciências Ambientais, Vassouras, RJ, Brasil
| | - M T Serdeiro
- Universidade de Vassouras, Laboratório de Insetos Vetores, Vassouras, RJ, Brasil.,Fundação Oswaldo Cruz - FIOCRUZ, Instituto Oswaldo Cruz - IOC, Laboratório Interdisciplinar de Vigilância Entomológica em Diptera e Hemiptera, Rio de Janeiro, RJ, Brasil
| | - R R B T Vieira
- Fundação Educacional Dom André Arcoverde, Faculdade de Medicina de Valença, Centro de Ensino Superior de Valença, Valença, RJ, Brasil
| | - L S Oliveira
- Universidade de Vassouras, Pró-Reitoria de Ciências da Saúde, Vassouras, RJ, Brasil
| | - M Maleck
- Universidade de Vassouras, Laboratório de Insetos Vetores, Vassouras, RJ, Brasil.,Universidade de Vassouras, Mestrado Profissional em Ciências Ambientais, Vassouras, RJ, Brasil.,Fundação Oswaldo Cruz - FIOCRUZ, Instituto Oswaldo Cruz - IOC, Laboratório de Entomologia Médica e Forense, Rio de Janeiro, RJ, Brasil
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Fonseca ALC, Magalhães TA, Melo LA, Oliveira LS, Brondani GE. Rescue and vegetative propagation of Eremanthus erythropappus (DC.) MacLeish in natural stand. BRAZ J BIOL 2021; 81:566-574. [PMID: 32876166 DOI: 10.1590/1519-6984.225119] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2019] [Accepted: 02/14/2020] [Indexed: 11/21/2022] Open
Abstract
The native stands of 'candeia' (Eremanthus erythropappus) have been explored through management plans due to the economic potential of essential oil. The rescue of adult trees, as well as the application of silvicultural techniques that favor the restoration of the stand, can contribute to the genetic conservation of this species. This study's objective was to assess the efficiency of propagation techniques for the rescue of 26 matrices of 'candeia' in a natural managed stand and discussion about the rhizogenesis. In August 2017, trees were induced to regrowth by coppice, followed by exposure and scarification of roots. The emergence of shoots and morphology were evaluated according to the origin (i.e., stump or root). After that period, 19 matrices had their sprouts collected for the preparation of apical cuttings. Indole-3-butyric acid (IBA) was applied at the base of the cuttings. Cutting survival at greenhouse exit (GE), rooting at shade house exit (SHE), morphology and root anatomy were evaluated. In 189 days, the scarification of roots promoted 76.92% of budding. The percentage of sprouted matrices, number of shoots per matrice, length, diameter, and shoot length/diameter ratio increased over time. Only 12.2% of the cuttings survived in GE, and of these, 7.9% rooted in SHE. The cutting resulted in the formation of a clonal mini-garden of 'candeia', with seven of the 19 matrices submitted to propagation. The anatomical analyses showed that bud formation occurs from cell redifferentiation in the phloem parenchyma, and presence of crystals on the walls of the vessel elements of the secondary xylem. The shoots induction from scarification of roots could be used as a silvicultural practice for the reestablishment of the native fragments handle.
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Affiliation(s)
- A L C Fonseca
- ªDepartamento de Ciências Florestais, Universidade Federal de Lavras, universitário, s.n., CP 3037, CEP 37200-900, Lavras, MG, Brasil
| | - T A Magalhães
- Departamento de Biologia, Universidade Federal de Lavras, universitário, s.n., CP 3037, CEP 37200-900, Lavras, MG, Brasil
| | - L A Melo
- ªDepartamento de Ciências Florestais, Universidade Federal de Lavras, universitário, s.n., CP 3037, CEP 37200-900, Lavras, MG, Brasil
| | - L S Oliveira
- Instituto de Ciências Agrárias, Universidade Federal de Minas Gerais, Avenida Universitária, universitário, CEP 39404-547, Montes Claros, MG, Brasil
| | - G E Brondani
- ªDepartamento de Ciências Florestais, Universidade Federal de Lavras, universitário, s.n., CP 3037, CEP 37200-900, Lavras, MG, Brasil
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Diniz-de-Figueiredo FE, Lima LF, Oliveira LS, Bernardino IM, Paiva SM, Faria-E-Silva AL. The impact of two root canal treatment protocols on the oral health-related quality of life: a randomized controlled pragmatic clinical trial. Int Endod J 2020; 53:1327-1338. [PMID: 32619274 DOI: 10.1111/iej.13356] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2019] [Revised: 06/25/2020] [Accepted: 06/26/2020] [Indexed: 12/15/2022]
Abstract
AIM To assess the impact of two root canal treatment protocols on the oral health-related quality of life (OHRQoL) of patients in need of root canal treatment on their anterior teeth. METHODOLOGY The sample consisted of 120 participants (mean age: 34 years) enrolled in a pragmatic randomized clinical trial evaluating two root canal treatment protocols. Anterior teeth with nonvital pulps were allocated for root canal preparation with either hand files and filled with lateral compaction of gutta-percha (manual protocol) or canal preparation with a single file in a reciprocating movement and filled with a single cone technique (Reciproc protocol). OHRQoL data were assessed using the Oral Health Impact Profile instrument (OHIP-14), which was administered before the root canal intervention (baseline), and 6 and 12 months after treatment. Demographic and clinical characteristics of participants were collected at baseline. Data were analysed using bivariate analyses, Poisson univariate and multiple regression (α = 0.05). RESULTS The drop-out rate from baseline was 27% and 28% at 6 and 12 months after treatment, respectively. Both root canal protocols significantly enhanced patients' OHRQoL, regardless of the follow-up time (P < 0.001). After 6 months, patients treated with the Reciproc protocol had significantly lower OHIP-14 overall scores (P = 0.030), as well as significantly lower scores for psychological discomfort (P = 0.031) and social disability (P = 0.013). After 12 months, no significant difference was observed between the two root canal protocols for OHIP-14 overall scores (P = 0.174). Either large or moderate effect sizes were observed for all domains and overall scores at both evaluation times, irrespective of the protocol. Low-income persons (RR = 2.03) and the Reciproc protocol (RR = 1.52) had a higher likelihood of a positive impact on OHRQoL 12 months after root canal treatment. CONCLUSIONS The two root canal protocols improved the OHRQoL and differences in scores were observed only after 6 months with poorer OHRQoL for the manual protocol. After 12 months, patients with low-income status and treated with Reciproc were associated with a greater improvement in OHRQoL scores.
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Affiliation(s)
| | - L F Lima
- Private clinic, Aracaju, SE, Brazil
| | - L S Oliveira
- Graduate Program in Health Sciences, Federal University of Sergipe, Aracaju, SE, Brazil
| | - I M Bernardino
- Department of Dentistry, State University of Paraíba, Campina Grande, PB, Brazil
| | - S M Paiva
- Department of Pediatric Dentistry, School of Dentistry, Federal University of Minas Gerais, Belo Horizonte, MG, Brazil
| | - A L Faria-E-Silva
- Department of Dentistry, Federal University of Sergipe, Aracaju, SE, Brazil
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Togeiro S, Oliveira LS, Guimaraes TM, Luz GP, Coelho G, Badke LN, Tufik S, Bittencourt L. 0663 The Longterm Effect of CPAP Compared to Mandibular Advancement Device on Metabolic Profile in Mild Obstructive Sleep Apnea. Sleep 2020. [DOI: 10.1093/sleep/zsaa056.659] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Abstract
Introduction
Moderate and severe Obstructive Sleep Apnea (OSA) have been independently associated to dyslipidemia with controversial results of improvement with CPAP. Less evidence exists regarding this issue in mild OSA. A current treatment for mild OSA is Mandibular Advancement Device (MAD), however its effectiveness on metabolic profile needs to be compared to CPAP.Our aim was to compare MAD with CPAP and no treatment on metabolic profile during one year in mild OSA.
Methods
Cross sectional analyses included 79 mild OSA patients randomized in CPAP group (n: 31), MAD group (n. 25) and Control group (n: 23). Metabolic profile was investigated before and after 6 and months.
Results
Mean age: 47± 9 years, BMI: 28±3.7 kg/m AHI: 9.5±2.9/h. There were no differences in anthropometric data, total cholesterol (TCT) HDL-C, LDL-C, Triglycerides (TC) and glycated Hemoglobin (Hb1c) among groups. MAD and CPAP reduced AHI at 6 and 12 months (9.3 ± 5.2 to 4.2 ± 9.1 to 3.8 ± 12.6 / 10.0 ± 4.6 to 1.2 ± 9.9 to 1.7 ± 14.2, p: 0.01 respectively). BMI did not change in groups at 6 and 12 months. MAD adherence was higher than CPAP at 6 months (5.8 ± 2.8 hs/day vs 3.8 ± 3.0 hs/day; p: 0.01) and 12 months 5.7 ± 2.7 hs/day vs 3.8 ± 3.4 hs/day; p: 0.01). Despite of lower adherence than MAD, CPAP was effective in reduce TCT and LDL- CT at 6 and 12 months (Intention to treat analyses TCT: 189.3±51.4 mg/dl to 186.1±51.4 mg/dl to 174.6±51 mg/dl; p: 0.03 / 112.8±48.7 mg/dl to 110.5±48.7 mg/dl to 95.8±48.7mg/dl; p: 0.03 respectively), however HDL-C, TG and Hbc didn′t change.
Conclusion
Long term CPAP treatment was effective in reducing cholesterol in mild OSA.
Support
Associação Fundo Incentivo à Psicobiologia (AFIP)
CAPES
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Affiliation(s)
- S Togeiro
- Universidade Federal de Sao Paulo, Sao Paulo, BRAZIL
| | - L S Oliveira
- Universidade Federal de Sao Paulo, Sao Paulo, BRAZIL
| | - T M Guimaraes
- Universidade Federal de Sao Paulo, Sao Paulo, BRAZIL
| | - G P Luz
- Universidade Federal de Sao Paulo, Sao Paulo, BRAZIL
| | - G Coelho
- Universidade Federal de Sao Paulo, Sao Paulo, BRAZIL
| | - L N Badke
- Universidade Federal de Sao Paulo, Sao Paulo, BRAZIL
| | - S Tufik
- Universidade Federal de Sao Paulo, Sao Paulo, BRAZIL
| | - L Bittencourt
- Universidade Federal de Sao Paulo, Sao Paulo, BRAZIL
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20
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Avelino KYPS, Oliveira LS, Lucena-Silva N, de Melo CP, Andrade CAS, Oliveira MDL. Metal-polymer hybrid nanomaterial for impedimetric detection of human papillomavirus in cervical specimens. J Pharm Biomed Anal 2020; 185:113249. [PMID: 32193043 DOI: 10.1016/j.jpba.2020.113249] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2019] [Revised: 02/28/2020] [Accepted: 03/08/2020] [Indexed: 12/23/2022]
Abstract
The human papillomavirus (HPV) is one of the main sexually transmitted pathogens that infect the anogenital epithelium and mucous membranes. HPV genotypes can be classified as high and low oncogenic risk, with infection by the former resulting in cervical cancer in approximately 100 % of the cases. In this work, we developed an ultrasensitive electrochemical biosensor for the detection and identification of different HPV genotypes. A nanostructured platform based on a matrix of polyaniline (PANI) containing gold nanoparticles (AuNps) was designed for the chemical immobilization of a DNA probe capable of recognizing different HPV types. Cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and atomic force microscopy (AFM) were used to characterize the genosensor. The impedimetric responses indicate that the proposed sensor was able to detect HPV (types 6, 11, 16, 31, 33, 45, and 58) in cervical specimens (cDNA samples). We obtained different profiles of electrochemical responses for the high and low-risk HPV genotypes. By adopting a three-dimensional quantitative analysis of impedance response variables, it was possible to identify the existence of a pattern of association for samples of high oncogenic risk, which may lead to the differential diagnosis of HPV. The biosensor demonstrated an excellent analytical performance for the detection of HPV genotypes with high sensibility and selectivity. The genosensor exhibited a linear range of response in the 1 pg μL-1 to 100 pg μL-1 range. Besides, a limit of detection (LOD) of 2.74 pg μL-1 and 7.43 pg μL-1 was obtained for HPV11 and HPV16, respectively, with regression coefficients of 99.88 % and 99.47 %. Thus, the proposed sensor may serve as a good prognostic indicator for patients infected with papillomavirus.
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Affiliation(s)
- Karen Y P S Avelino
- Programa de Pós-Graduação em Inovação Terapêutica, Universidade Federal de Pernambuco, 50670-901 Recife, PE, Brazil; Laboratório de Biodispositivos Nanoestruturados, Departamento de Bioquímica, Universidade Federal de Pernambuco, 50670-901 Recife, PE, Brazil
| | - Léony S Oliveira
- Laboratório de Biodispositivos Nanoestruturados, Departamento de Bioquímica, Universidade Federal de Pernambuco, 50670-901 Recife, PE, Brazil
| | - Norma Lucena-Silva
- Instituto Aggeu Magalhães, Fundação Oswaldo Cruz (Fiocruz), 50670-420 Recife, PE, Brazil; Laboratório de Biologia Molecular, Departamento de Oncologia Pediátrica, Instituto de Medicina Integral Professor Fernando Figueira (IMIP), 50070-550 Recife, PE, Brazil
| | - Celso Pinto de Melo
- Departamento de Física, Universidade Federal de Pernambuco, 50670-901 Recife, PE, Brazil
| | - César A S Andrade
- Programa de Pós-Graduação em Inovação Terapêutica, Universidade Federal de Pernambuco, 50670-901 Recife, PE, Brazil; Laboratório de Biodispositivos Nanoestruturados, Departamento de Bioquímica, Universidade Federal de Pernambuco, 50670-901 Recife, PE, Brazil
| | - Maria D L Oliveira
- Programa de Pós-Graduação em Inovação Terapêutica, Universidade Federal de Pernambuco, 50670-901 Recife, PE, Brazil; Laboratório de Biodispositivos Nanoestruturados, Departamento de Bioquímica, Universidade Federal de Pernambuco, 50670-901 Recife, PE, Brazil.
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21
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Dionísio FCF, Oliveira LS, Hernandes MA, Engel EE, Rangayyan RM, Azevedo-Marques PM, Nogueira-Barbosa MH. Manual and semiautomatic segmentation of bone sarcomas on MRI have high similarity. ACTA ACUST UNITED AC 2020; 53:e8962. [PMID: 32022102 PMCID: PMC6993358 DOI: 10.1590/1414-431x20198962] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [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: 07/03/2019] [Accepted: 10/14/2019] [Indexed: 02/07/2023]
Abstract
The aims of this study were to evaluate the intra- and interobserver reproducibility of manual segmentation of bone sarcomas in magnetic resonance imaging (MRI) studies and to compare manual and semiautomatic segmentation methods. This retrospective study included twelve osteosarcoma and eight Ewing sarcoma MRI studies performed prior to any therapeutic intervention. All cases were histopathologically confirmed. Three radiologists used 3D-Slicer software to perform manual segmentation of bone sarcomas in a blinded and independent manner. One radiologist segmented manually and also performed semiautomatic segmentation with the GrowCut tool. Segmentation exercises were timed for comparison. The dice similarity coefficient (DSC) and Hausdorff distance (HD) were used to evaluate similarity between the segmentation results and further statistical analyses were performed to compare DSC, HD, and volumetric results. Manual segmentation was reproducible with intraobserver DSC varying from 0.83 to 0.97 and HD from 3.37 to 28.73 mm. Interobserver DSC of manual segmentation showed variation from 0.73 to 0.97 and HD from 3.93 to 33.40 mm. Semiautomatic segmentation compared to manual segmentation resulted in DSCs of 0.71−0.96 and HDs of 5.38−31.54 mm. Semiautomatic segmentation required significantly less time compared to manual segmentation (P value ≤0.05). Among all situations compared, tumor volumetry did not show significant statistical differences (P value >0.05). We found excellent intra- and interobserver agreement for manual segmentation of osteosarcoma and Ewing sarcoma. There was high similarity between manual and semiautomatic segmentation, with a significant reduction of segmentation time using the semiautomatic method.
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Affiliation(s)
- F C F Dionísio
- Departamento de Imagens Médicas, Hematologia e Oncologia Clínica, Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, SP, Brasil.,Laboratório de Pesquisa em Imagens Musculoesqueléticas, Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, SP, Brasil
| | - L S Oliveira
- Departamento de Imagens Médicas, Hematologia e Oncologia Clínica, Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, SP, Brasil.,Laboratório de Pesquisa em Imagens Musculoesqueléticas, Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, SP, Brasil
| | - M A Hernandes
- Departamento de Imagens Médicas, Hematologia e Oncologia Clínica, Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, SP, Brasil
| | - E E Engel
- Departamento de Imagens Médicas, Hematologia e Oncologia Clínica, Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, SP, Brasil
| | - R M Rangayyan
- Department of Electrical and Computer Engineering, University of Calgary, Calgary, Alberta, Canada
| | - P M Azevedo-Marques
- Departamento de Imagens Médicas, Hematologia e Oncologia Clínica, Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, SP, Brasil
| | - M H Nogueira-Barbosa
- Departamento de Imagens Médicas, Hematologia e Oncologia Clínica, Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, SP, Brasil.,Laboratório de Pesquisa em Imagens Musculoesqueléticas, Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, SP, Brasil
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22
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Carvalho JC, Mestrinho HD, Oliveira LS, Varjão MM, Aimée N, Qvist V. Validation of the Visible Occlusal Plaque Index (VOPI) in estimating caries lesion activity. J Dent 2017. [PMID: 28625857 DOI: 10.1016/j.jdent.2017.06.003] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
Abstract
OBJECTIVE The present study appraises the construct validity of the Visible Occlusal Plaque Index (VOPI) along with its sub-types, convergent and discriminant validity. METHODS 618 10-15year old Brazilian adolescents were included. The VOPI has a four-point ordinal scale ranging from no plaque to heavy plaque. VOPI scores and caries status on permanent molars were mapped and recorded at individual anatomical sites of the groove-fossa-system and at surface level. Outcomes were presence of sound site/surface and site/surface with active or inactive caries lesions (non-cavitated or cavitated). RESULTS Construct validity was assumed based on qualitative assessment as no plaque (score 0) and thin plaque (score 1) reflected the theoretical knowledge that a regular disorganization of the dental biofilm either maintains the caries process at sub-clinical levels or inactivate it clinically. The VOPI also showed convergent validity since the likelihood that anatomical sites with no or thin plaque had inactive lesions simultaneously with sites with thick plaque (score 2) or heavy plaque (score 3) having active lesions were overall significant (RR=1.0-7.8). At surface level, discriminant validity of the VOPI was evidenced with multivariable analysis (GEE), by its ability to discriminate between the groups of adolescents with different oral hygiene status; negative association between adolescents with thick and heavy plaque and those with sound occlusal surfaces was found (OR=0.3, p<0.001). CONCLUSION The VOPI has construct as well as convergent and discriminant validity and is therefore recommended as an additional clinical tool to estimate caries lesions activity and support treatment decisions. CLINICAL SIGNIFICANCE The Visible Occlusal Plaque Index is an additional clinical tool to the assessment of oral hygiene and caries lesion activity. The VOPI is recommended to standardize and categorize information on the occlusal biofilm, thus being suitable for direct application in research and clinical settings.
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Affiliation(s)
- J C Carvalho
- Faculty of Medicine and Dentistry, Catholic University of Louvain, Belgium.
| | - H D Mestrinho
- Faculty of Health Sciences, University of Brasília, Brazil
| | - L S Oliveira
- Faculty of Health Sciences, University of Brasília, Brazil
| | - M M Varjão
- Faculty of Health Sciences, University of Brasília, Brazil
| | - N Aimée
- Faculty of Health Sciences, University of Brasília, Brazil
| | - V Qvist
- Faculty of Health and Medical Sciences, University of Copenhagen, Denmark
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23
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Affiliation(s)
- JO Nunes
- Universidade Federal do Recôncavo da Bahia/UFRB, Brazil
| | - RD Abreu
- Universidade Federal do Recôncavo da Bahia/UFRB, Brazil
| | - JAG Brito
- Universidade Federal do Recôncavo da Bahia/UFRB, Brazil
| | - RF da Silva
- Universidade Federal do Recôncavo da Bahia/UFRB, Brazil
| | - LS Oliveira
- Universidade Federal do Recôncavo da Bahia/UFRB, Brazil
| | - NA Jesus
- Universidade Federal do Recôncavo da Bahia/UFRB, Brazil
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24
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Oliveira W, Justino E, Oliveira LS. Comparing compression models for authorship attribution. Forensic Sci Int 2013; 228:100-4. [PMID: 23597746 DOI: 10.1016/j.forsciint.2013.02.025] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2012] [Revised: 02/12/2013] [Accepted: 02/13/2013] [Indexed: 10/27/2022]
Abstract
In this paper we compare different compression models for authorship attribution. To this end, three different types of compressors, Lempel-Ziv type (GZip), block sorting type (BZip) and statistical type (PPM), along with two different similarity measures were considered in our experiments. Besides, two different attribution methods are analyzed in this paper. Through a series of experiments performed on two different databases, we were able to show that all the compressors behave similarly, but the similarity measures can vary considerably depending on the strategy used for authorship attribution. Our results corroborate with the literature in the sense that compression models are a good alternative for authorship attribution surpassing traditional pattern recognition systems based on classifiers and feature extraction.
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Affiliation(s)
- W Oliveira
- Pontifical Catholic University of Parana (PUCPR), R. Imaculada Conceição, 1155 Curitiba, PR, Brazil
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25
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Oliveira KA, Oliveira LS, Dias CCA, Silva A, Almeida MR, Almada G, Bouyer DH, Galvão MAM, Mafra C. Molecular identification of Rickettsia felis in ticks and fleas from an endemic area for Brazilian Spotted Fever. Mem Inst Oswaldo Cruz 2008; 103:191-4. [PMID: 18425272 DOI: 10.1590/s0074-02762008000200011] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2007] [Accepted: 03/20/2008] [Indexed: 11/21/2022] Open
Abstract
Rickettsioses are arthropod-borne diseases caused by parasites from the Order Rickettsiales. The most prevalent rickettsial disease in Brazil is Brazilian Spotted Fever (BSF). This work intends the molecular detection of those agents in ectoparasites from an endemic area of BSF in the state of Espírito Santo. A total of 502 ectoparasites, among them Amblyomma cajennense, Amblyomma dubitatum (A. cooperi), Riphicephalus sanguineus, Anocentor nitens and Ctenocephalides felis, was collected from domestic animals and the environment and separated in 152 lots according to the origin. Rickettsia sp. was detected in pools of all collected species by amplification of 17 kDa protein-encoding gene fragments. The products of PCR amplification of three samples were sequenced, and Rickettsia felis was identified in R. sanguineus and C. felis. These results confirm the presence of Rickettsia felis in areas previously known as endemic for BSF, disease caused by Rickettsia rickettsii. Moreover, they show the needing of further studies for deeper knowledge of R. felis-spotted fever epidemiology and differentiation of these diseases in Brazil.
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Affiliation(s)
- K A Oliveira
- Laboratório de Bioquímica e Biologia Molecular de Agentes Infecciosos e Parasitários, Depatamento de Bioquímica e Biologia Molecular, Universidade Federal de Viçosa, Viçosa, MG, 36570-000, Brasil
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26
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Oliveira LS, Sobral LL, Takeda SYM, Betini J, Guirro RRJ, Somazz MC, Teodori RM. [Electrical stimulation and swimming in the acute phase of axonotmesis: their influence on nerve regeneration and functional recovery]. Rev Neurol 2008; 47:11-15. [PMID: 18592474] [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] [Indexed: 05/26/2023]
Abstract
INTRODUCTION Little attention has been given to the influence of low-frequency phasic electrical stimulation (LFPES) and physical exercise on the quality of peripheral nerve regeneration and functional recovery. AIM. To evaluate the influence of LFPES, swimming and the association between the two in terms of the morphology of the regenerated sciatic nerve following axonotmesis. MATERIALS AND METHODS Thirty Wistar mice (222.05 +/- 42.2 g) were distributed into groups: control (C), denervated (D), denervated + swimming (DS), denervated + electrostimulation (DE) and denervated + swimming + electrostimulation (DSE). After 24 hours of axonotmesis, the soleus muscle of the DE and DSE groups was stimulated electrically. The DS and DSE groups swam over a period of 22 days. The number of axons, morphometric data on the nerve and the functional index of the sciatic nerve (FIS) were evaluated. RESULTS The number of axons in the denervated groups was higher than in the control group, and in the DE group the figure was higher than in the D group. The axonal diameter was smaller in the denervated groups, yet in the DS group it was higher than in the D group. The other morphometric parameters were quite similar to those of the C group. The FIS between days 7 and 14 of the post-operative period was different to the pre-operative index and that measured on day 21 of the post-operative period; the DSE group, however, differed from the pre-operative values. CONCLUSIONS Swimming and LFPES, applied on an individual basis, do not affect the maturation of the regenerated fibres or functional recovery. LFPES favoured axonal regeneration and combining the treatments delayed functional recovery without having any influence on nerve regeneration.
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Affiliation(s)
- L S Oliveira
- Facultad de Ciencias de la Salud, Laboratorio de Plasticidad Neuromuscular, Universidad Metodista de Piracicaba, Piracicaba, São Paulo, Brasil
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Abstract
Na+,K+-ATPase and Mg2+-ATPase activities were determined in the synaptic plasma membranes from hippocampus of rats subjected to chronic and acute proline administration. Na+,K+-ATPase activity was significantly reduced in chronic and acute treatment by 33% and 40%, respectively. Mg2+-ATPase activity was not altered by any treatment. In another set of experiments, synaptic plasma membranes were prepared from hippocampus and incubated with proline or glutamate at final concentrations ranging from 0.2 to 2.0 mM. Na+,K+-ATPase, but not Mg2+-ATPase was inhibited (30%) by the two amino acids. In addition, competition between proline and glutamate for the enzyme activity was observed, suggesting a common binding site for these amino acids. Considering that Na+,K+-ATPase activity is critical for normal brain function, the results of the present study showing a marked inhibition of this enzyme by proline may be associated with the neurological dysfunction found in patients affected by type II hyperprolinemia.
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Affiliation(s)
- Z L Pontes
- Departamento de Bioquímica, ICBS, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil
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28
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Pontes ZE, Oliveira LS, Baveresco CS, Streck EL, Dutra-Filho CS, Wajner M, Wannmacher CM, Wyse AT. Proline administration decreases Na+,K+-ATPase activity in the synaptic plasma membrane from cerebral cortex of rats. Metab Brain Dis 1999; 14:265-72. [PMID: 10850553 DOI: 10.1023/a:1020789109913] [Citation(s) in RCA: 16] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Buffered proline was injected subcutaneously into rats twice a day at 8 h intervals from the 6th to the 28th day of age. Control rats received saline in the same volumes. The animals were weighed and killed by decapitation 12 h after the last injection. Cerebral cortex was used for the determination of Na+,K+-ATPase and Mg2+-ATPase activities. Body, whole brain and cortical weights were similar in the two groups. Na+,K+-ATPase activity was significantly reduced (by 20%) in membranes from the proline-treated group compared to the controls, whereas Mg2+-ATPase activity was not affected by proline. In another set of experiments, synaptic plasma membranes were prepared from cerebral cortex of 29-day-old rats and incubated with proline at final concentrations ranging from 0.1 to 2.0 mM. Na+,K+-ATPase activity, but not Mg2+-ATPase activity, was inhibited by 20-30%. Since proline concentrations in plasma of chronically treated rats and of type 11 hyperprolinemic children are of the same order of magnitude as those tested in vitro, the results suggest that reduction of Na+,K+-ATPase activity may contribute to the neurological dysfunction found in some patients affected by type II hyperprolinemia.
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Affiliation(s)
- Z E Pontes
- Departamento de Bioquímica, ICBS, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
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