Base de dados : LILACS
Pesquisa : D13.444.308.497.220 [Categoria DeCS]
Referências encontradas : 138 [refinar]
Mostrando: 1 .. 10   no formato [Detalhado]

página 1 de 14 ir para página                         

  1 / 138 LILACS  
              next record last record
seleciona
para imprimir
Fotocópia
Texto completo SciELO Cuba
Texto completo
Texto completo
Id: biblio-1156440
Autor: Amor Vigil, Ana María; Hernández Miranda, Londy Lorena; Díaz Alonso, Carmen Alina; Ruiz Moleón, Vera; Fernández Martínez, Lesbia; Oliva Hernández, Ignacio; Garrote Santana, Heidys.
Título: Frecuencia de aberraciones moleculares en pacientes cubanos con leucemia mieloide aguda / Frequency of molecular disorders in Cuban patients with acute myeloid leukemia
Fonte: Rev. cuba. hematol. inmunol. hemoter;36(3):e1164, jul.-set. 2020. tab, graf.
Idioma: es.
Resumo: Introducción: En el Instituto de Hematología e Inmunología se realiza el estudio molecular de las leucemias mieloides agudas (LMA). Para las leucemias mieloides agudas no promielocíticas (LPM) se determinan cuatro biomarcadores: los genes de fusión RUNX1-RUNX1T1 y CBF(-MYH11, la duplicación interna en tándem del gen FLT3 (DIT FLT3) y la mutación A del gen NPM1 (NPM1-A). Objetivo: Determinar la frecuencia de estos cuatro biomarcadores, en pacientes cubanos con leucemias mieloides agudas primaria no promielocíticas. Métodos: Se incluyeron 91 pacientes entre niños y adultos, estudiados en el Instituto durante tres años desde el debut. A partir de ARN de sangre medular se obtuvo ADN complementario por transcripción inversa; se amplificaron los fragmentos correspondientes mediante la reacción en cadena de la polimerasa y el producto se analizó por electroforesis capilar. Resultados: El RUNX1-RUNX1T1 apareció en el 24,2 por ciento, fue más frecuente en los pacientes pediátricos y disminuyó significativamente con la edad. El CBFβ-MYH11 solo se encontró en adultos (4,8 por ciento). La NPM1-A con 41 por ciento fue mayoritaria entre los adultos. La DIT FLT3 se observó en el 21,6 por ciento y no mostró relación con la edad. NPM1-A y DIT FLT3 fueron las aberraciones con mayor presencia simultánea. Conclusiones: Por primera vez se describe la frecuencia de los cuatro biomarcadores moleculares en los pacientes cubanos con leucemias mieloides agudas primaria no promielocíticas; su comportamiento fue similar a lo descrito por otros autores, aunque se encontraron algunas particularidades(AU)

Introduction: At the Institute of Hematology and Immunology, the molecular study of acute myeloid leukemias (AML) is carried out. For nonpromyelocytic acute myeloid leukemias, four biomarkers are determined: the RUNX1-RUNX1T1 and CBF(-MYH11 fusion genes, the internal tandem duplication of the FLT3 gene (DIT FLT3), and the A mutation of the NPM1 gene (NPM1-A). Objective: To determine the frequency of these four biomarkers in Cuban patients with nonpromyelocytic primary acute myeloid leukemias. Methods: 91 patients were included, children and adults, who were studied at the Institute for three years from their disease debut. Complementary DNA was obtained from medullary blood RNA by reverse transcription. The corresponding fragments were amplified by polymerase chain reaction and the product was analyzed by capillary electrophoresis. Results: RUNX1-RUNX1T1 appeared in 24.2 percent; it was more frequent in pediatric patients and decreased significantly with age. CBFβ-MYH11 was found only in adults (4.8 percent). NPM1-A, accounting for 41 percent, represented the majority among adults. FLT3 DIT was observed in 21.6 por ciento and was not related to age. NPM1-A and DIT FLT3 were the disorders with the greatest concurrence. Conclusions: For the first time, the frequency of the four molecular biomarkers is described in Cuban patients with primary non-promyelocytic acute myeloid leukemias. Its characterization was similar to that described by other authors, although some peculiarities were found(AU)
Descritores: Biomarcadores
Leucemia Mieloide Aguda/genética
Reação em Cadeia da Polimerase
DNA Complementar
Transcrição Reversa
-Eletroforese Capilar
Limites: Humanos
Responsável: CU1.1 - Biblioteca Médica Nacional


  2 / 138 LILACS  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo SciELO Chile
Texto completo
Id: biblio-838969
Autor: Li, Pengfei; Yu, Xuejing; Xie, Jianshan; Yao, Xiaolei; Liu, Wenzhong; Yao, Jianbo; Zhu, Zhiwei; Lyu, Lihua.
Título: Expression of cocaine- and amphetamine-regulated transcript (CART) in hen ovary
Fonte: Biol. Res;50:18, 2017. tab, graf.
Idioma: en.
Projeto: Shanxi Scholarship Council of China; . Shanxi Sci-technological Collaboration; . SXAU (Shanxi Agricultural University) Major Research Achievement Cultivation; . SXAU Introduction of Doctor Research Startup Fund; . Chinese Natural Science Foundation.
Resumo: BACKGROUND: Cocaine- and amphetamine-regulated transcript (CART), discovered initially by via differential display RT-PCR analysis of brains of rats administered cocaine, is expressed mainly in central nervous system or neuronal origin cells, and is involved in a wide range of behaviors, such as regulation of food intake, energy homeostasis, and reproduction. The hens egg-laying rate mainly depends on the developmental status of follicles, expression of CART have not been identified from hen follicles, the regulatory mechanisms of CART biological activities are still unknown. The objective of this study was to characterize the mRNA expression of CART in hen follicular granulosa cells and determine CART peptide localization and regulatory role during follicular development. METHODS: Small white follicles (1-2 mm in diameter) were treated for RNA isolation; Small white follicles (1-2 mm in diameter) and large white follicles (4-6 mm in diameter) were treated for immunohistochemical localization and large white follicles (4-6 mm in diameter), small yellow follicles (6-8 mm in diameter), large yellow follicles (9-12 mm in diameter), mature follicles (F5, F4, F3, F2, F1, >12 mm in diameter) were treated for RNA isolation and Real time PCR. RESULTS: The results showed that full length of the CDS of hen CART was 336 bp encoding a 111 amino acid polypeptide. In the hen ovary, CART peptide was primarily localized to the theca layer, but not all, the oocyte and granulosa layer, with diffused, weaker staining than relative to the theca cell layer. Further, amount of CART mRNA was more (P < 0.05) in granulosa cells of 6-8 mm follicles compared with that in granulosa cells of other follicles. However, CART mRNA amount was greater in theca cells of 4-6 mm follicles relative to follicles of other sizes (P < 0.05). CONCLUSIONS: Results suggest that CART could play a potential role in developmental regulation of chicken follicles.
Descritores: Folículo Ovariano/metabolismo
Proteínas do Tecido Nervoso/metabolismo
-Imuno-Histoquímica
Células Cultivadas
Galinhas
DNA Complementar/biossíntese
Reação em Cadeia da Polimerase Via Transcriptase Reversa
Perfilação da Expressão Gênica
Proteínas do Tecido Nervoso/genética
Limites: Animais
Feminino
Responsável: CL1.1 - Biblioteca Central


  3 / 138 LILACS  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo SciELO Chile
Texto completo
Id: biblio-950749
Autor: Yu, Guangchao; Chen, Lei; Lin, Chii-wann; Li, Bing; Cui, Hemiao; Chen, Siyi; Miao, Jian; Bian, Huawei; Chen, Dingqiang; Deng, Yang.
Título: Loop-mediated isothermal amplification assays for screening of bacterial integrons
Fonte: Biol. Res;47:1-10, 2014. ilus, tab.
Idioma: en.
Projeto: National 973-Plan of China; . International Science & Technology Cooperation Program; . Science and Technology Planning Project of Guangdong Province, China; . National Natural Science Foundation of China; . National Science and Technology Support Program; . National Outstanding Doctoral Dissertation Funding; . Guangdong Outstanding Doctoral Dissertation Funding; . China Postdoctoral Science Foundation funded; . Fundamental Research Funds for the Central Universities; . Fund for Outstanding Youth of Anhui Academy of Agricultural Sciences.
Resumo: BACKGROUND: The occurrence and prevalence of integrons in clinical microorganisms and their role played in antimicrobial resistance have been well studied recently. As screening and detection of integrons are concerned, current diagnostic methodologies are restricted by significant drawbacks and novel methods are required for integrons detection. RESULTS: In this study, three loop-mediated isothermal amplification (LAMP) assays targeting on class 1, 2 and 3 integrons were implemented and evaluated. Optimization of these detection assays were performed, including studing on the reaction temperature, volume, time, sensitivity and specificity (both primers and targets). Application of the established LAMP assays were further verified on a total of 1082 isolates (previously identified to be 397 integron-positive and 685 integron-negative strains). According to the results, the indispensability of each primer had been confirmed and the optimal reaction temperature, volume and time were found to be 65°C, 45 min and 25 µL, respectively. As application was concerned, 361, 28 and 8 isolates carrying intI1, intI2 and intI3 yielded positive amplicons, respectively. Other 685 integron-negative bacteria were negative for the integron-screening LAMP assays, totaling the detection rate and specificity to be 100%. CONCLUSIONS: The intI1-, intI2- and intI3-LAMP assays established in this study were demonstrated to be the valid and rapid detection methodologies for the screening of bacterial integrons.
Descritores: DNA Bacteriano/isolamento & purificação
Técnicas de Amplificação de Ácido Nucleico/métodos
Integrons
-Compostos Orgânicos
Salmonella/genética
Serratia marcescens/genética
Staphylococcus/genética
Vibrio cholerae/genética
Contagem de Colônia Microbiana
Testes de Sensibilidade Microbiana
Reação em Cadeia da Polimerase/métodos
Sensibilidade e Especificidade
DNA Complementar
Primers do DNA
Integrases/genética
Farmacorresistência Bacteriana/genética
Eletroforese em Gel de Ágar
Escherichia coli/genética
Corantes Fluorescentes
Temperatura Alta
Tipo de Publ: Research Support, Non-U.S. Gov't
Responsável: CL1.1 - Biblioteca Central


  4 / 138 LILACS  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo SciELO Chile
Texto completo
Id: biblio-950756
Autor: Palomino, Jaime; Herrera, Giannina; Dettleff, Phillip; Martínez, Víctor.
Título: Growth differentiation factor 9 and bone morphogenetic protein 15 expression in previtellogenic oocytes and during early embryonic development of Yellow-tail Kingfish Seriola lalandi
Fonte: Biol. Res;47:1-7, 2014. graf, tab.
Idioma: en.
Projeto: CONICYT; . FONDECYT; . Chilean Aquaculture Diversification Grant.
Resumo: BACKGROUND: During fish oocyte maturation, specific molecules are expressed and accumulated within oocyte until fertilization and embryo development. Special attention have been paid in members of the transforming growth factor (TGF-ß) superfamily; growth differentiation factor 9 (GDF9/gdf9) and bone morphogenetic protein 15 (BMP15/bmp15), which exert regulatory functions during oocyte maturation and follicle development. However, little attention has been paid to the involvement of these molecules during embryogenesis considering its importance for the formation of a good quality egg and subsequent embryo survival. The purpose of this study was to analyze the expression of gdf9 andbmp15 in previtellogenic oocytes and during early embryonic development in Seriola lalandi, a pelagic fish with increasing prospect for its aquaculture development, which however, show high mortality at embryo and larval stages. RESULTS: Through RT-qPCR it was found that gdf9 expression was higher in previtellogenic oocytes decreasing after ovulation. This expression profile agrees with its participation in early stages of the follicular development. The transcripts for bmp15 also showed the highest levels in previtellogenic oocytes, however this expression was lower than obtained with gdf9. Conversely, in recently spawned oocytes mRNA bmp15 levels were highest than observed to gdf9. This, is consequent with the main role proposed for this growth factor at the final fish oocyte maturation: avoid the ovulation of an immature oocyte. During embryo development, low levels of mRNA were detected to gdf9, with an increase in 48 H post-fertilization embryos. The bmp15 expression did not change throughout development and was higher than gdf9 at 16 cells, blastula and appearance embryos stages. CONCLUSIONS: Both (gdf9 and bmp15) expression profiles in previtellogenic oocytes and newly spawned eggs are consistent with the described functions for these growth factors in vertebrate ovarian physiology in early and late stages of the follicular development. So, these genes could be considered as quality biomarkers at these stages. However, further studies of these proteins throughout folliculogenesis, are necessaries to fully understand their functions during the oocyte formation. In addition, the persistent expression of these growth factors during development, allows us to speculate possible roles in embryonic processes, which must also be addressed.
Descritores: Oócitos/metabolismo
Vitelogênese/fisiologia
Perciformes/embriologia
Proteína Morfogenética Óssea 15/metabolismo
Fator 9 de Diferenciação de Crescimento/metabolismo
-Transcrição Genética/fisiologia
Perciformes/classificação
RNA Mensageiro/isolamento & purificação
RNA Mensageiro/metabolismo
Biomarcadores/análise
DNA Complementar/análise
Primers do DNA
Desenvolvimento Embrionário/genética
Reação em Cadeia da Polimerase em Tempo Real
Peixes/embriologia
Limites: Animais
Tipo de Publ: Research Support, Non-U.S. Gov't
Responsável: CL1.1 - Biblioteca Central


  5 / 138 LILACS  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
Id: biblio-1178187
Autor: Ianez, Renata Carolina Fraga.
Título: Avaliação da via do c-kit no adenoma pleomórfico e carcinoma adenoide cístico das glândulas salivares: estudo da expressão das proteínas da via, das mutações e da regulação pós-transcricional do gene kit / c-Kit signaling cascade in pleomorphic adenoma and adenoid cystic carcinoma of salivary glands: evaluation of cascade proteins, mutations and post-transcriptional regulation of gene Kit.
Fonte: São Paulo; s.n; 2016. 115 p. i, tabelas, quadros.
Idioma: pt.
Tese: Apresentada a Fundação Antônio Prudente para obtenção do grau de Doutor.
Resumo: Introdução: As neoplasias das glândulas salivares têm amplo espectro histológico resultante da múltipla diferenciação celular tumoral. O adenoma pleomórfico (AP) e o carcinoma adenoide cístico (CAC) são as mais comuns neoplasias benignas e malignas provenientes do ducto intercalado, respectivamente, além de serem compostas por estruturas luminais e células mioepiteliais. Em estudo realizado previamente pelo nosso grupo, detectamos que a proteína c-kit está envolvida nos processos da morfogênese das glândulas salivares e no adenoma pleomórfico. A proteína c-Kit tem papel importante no desenvolvimento de muitos processos embrionários, incluindo a gametogênese, melanogênese e hematopoiese, e também na biologia de tumores. Sua ativação induz diversas respostas intracelulares através de cascatas de sinalização de vias como PI3K/AKT e MAPK. Em tumores da glândula salivar ainda há poucos estudos sobre as alterações do gene KIT e das proteínas relacionadas a sua via de sinalização, assim como sua regulação pós-transcricional, realizada principalmente por meio dos microRNAs. O presente estudo avaliou, em APs e CACs (a) a localização das proteínas das vias PI3K/AKT/mTOR e MAPK por meio da técnica de imunoistoquímica; (b) a expressão dos microRNAs 221 e 222, relacionados ao gene KIT (c) a associação dos achados laboratoriais com variáveis clínicas, patológicas e sobrevida. Resultados: Nos casos de AP a proteína c-Kit foi identificada em formações luminais e em raras células isoladas no parênquima tumoral. Já nos CAC, observou-se positividade na membrana das células ductais. Para a via de PI3K/AKT/mTOR, no AP, a proteína PI3K beta mostrou-se parcialmente positiva no citoplasma das células próximas à capsula tumoral, e as proteínas AKT e mTOR fosforiladas, foram expressas especialmente nas células epiteliais e em poucas células mioepiteliais. Já no CAC, a proteína PI3K beta e AKT fosforilada mostraram-se negativas na maioria dos casos, e a proteína mTOR fosforilada foi expressa no citoplasma das células epiteliais e em algumas células mioepiteliais. Para a via MAPK, as proteínas RAS, MEK-1 fosforilada e ERK 1/2 foram negativas na maioria dos AP e CAC; B-Raf e MEK-2 fosforilada foram observadas nas células luminais dos AP. Nos CAC, estruturas luminais neoplásicas foram positivas para a proteína MEK-2 fosforilada; B-Raf foi positivo nas células luminais e mioepiteliais. Além disso, os pacientes que expressaram as proteínas mTOR e MEK-2 fosforilada apresentaram sobrevida câncer-específica significativamente aumentada (p=0,040 e p=0,005, respectivamente). Na análise do microRNAs, a expressão do miR-221 foi variável nas 13 amostras analisadas, tendo baixa expressão em 30,77% dos casos, expressão normal em 38,46 e expressão aumentada em 30,77% dos casos. Já nos APs o miR-221 foi detectado em 19 amostras, sendo 36,84% com baixa expressão, 52,63% com expressão normal e expressão aumentada foi vista em 10,53% dos casos. A expressão do miR-222 foi detectada em 14 CACs, sendo que a maioria dos casos (8 casos ­ 57,1%) a expressão do miR-222 foi semelhante ao observado nas amostras não neoplásicas. Nos APs, o miR-222 foi detectado em 22 amostras, sendo 31,8% com baixa expressão, 31,8% com expressão normal e 36,4% com expressão aumentada. Conclusão: Apesar de a proteína c-Kit ser expressa em ambas as neoplasias ­ AP e CAC, sua influência sobre as vias de sinalização MAPK e PI3K/AKT/mTOR ainda permanece por ser estabelecida. Ainda, os microRNAs 221 e 222 não mostram correlação consistente com a expressão de c-Kit nos tipos tumorais estudados.

Introduction: Salivary gland tumors present broad histological spectrum resulting from multiple tumor cell differentiation. Pleomorphic adenoma (PA) and adenoid cystic carcinoma (ACC) are the commonest benign and malignant salivary gland neoplasms originated from the intercalated duct region, respectively, and are composed by luminal structures and myoepithelial cells. In a previous study we detected that protein c-kit is involved in the process of salivary gland morphogenesis and PA. c-Kit protein is important during embryogenesis, including gametogenesis, melanogeneis and hematopoiesis as well as in tumorigenesis. Its activation induces various intracellular responses through pathways such as MAPK and PI3K/AKT/mTOR signaling cascades. In salivary gland neoplasms, only a few reports have shown that alterations in KIT gene are present and proteins related to its signaling pathway as well as its post-transcriptional regulation. This study has aimed at evaluating in PA and ACC: (a) the proteins location of PI3K/AKT/mTOR and MAPK pathways using immunohistochemistry (IHC); (b) expression of miR-221 and miR-222, related to KIT gene; and (c) the association of these findings with clinical, pathological and survival data of patients. Results: In PA c-kit was positive in isolated luminal cells; in ACC, neoplastic luminal structures were positive for c-Kit. In PA, PI3K beta protein was shown to be partially positive in the cytoplasm of cells near the tumor capsule and phosphor AKT and phospho mTOR, are specifically expressed in epithelial cells and in a few myoepithelial. In ACC, PI3K and phosphor AKT protein showed to be negative in most of cases. Phospho mTOR protein was expressed in the cytoplasm of epithelial cells and some myoepithelial cells. In MAPK pathway, Ras, ERK1/2 and phosphor MEK-1 proteins were negative in most PAs and CACs; B-Raf and phospho MEK-2 were detected in luminal cells of PA. In ACC neoplastic luminal structures were positive for phospho MEK-2; B-Raf was also positive in myoepithelial and epithelial cells. In addition, cases with expressed phospho-mTOR and phosphor MEK-2 proteins were significantly associated with higher cancer-specific survival (p = 0.040 and p = 0.005, respectively). Moreover, expression of miR-221 was detected in 13 CAC samples and 19 PA samples. In CAC, expression of miR-221 was downregulated in 30,77% of the samples, upregulated in 30,77% samples, and normal in 38,46% samples. In PA, miR-221 expression was downregulated in 36,84% samples, upregulated in 10,53% samples, and normal in 52,63% samples. Expression of miR-222 was detected in 14 CAC samples and 22 PA samples. In the majority of CAC samples, the expression of miR-222 was similar to that observed in non-neoplastic samples. In PA samples, expression of miR-222 was downregulated in 31,8% samples, upregulated in 36,4% samples, and normal in 31,8% samples. Conclusion: Although c-Kit expression is detected in PA and ACC, its influence on the MAPK e PI3K/AKT/mTOR signaling cascades remains to be established. miR-221 e -222 did not show a robust correlation with c-Kit expression in the tumors studied.
Descritores: Neoplasias das Glândulas Salivares/genética
Carcinoma Adenoide Cístico/genética
Adenoma Pleomorfo/genética
Proteínas Proto-Oncogênicas c-kit/genética
-Neoplasias das Glândulas Salivares/metabolismo
Neoplasias das Glândulas Salivares/patologia
Expressão Gênica
Análise de Sobrevida
Regulação da Expressão Gênica
Proteínas Proto-Oncogênicas/fisiologia
Proteínas Proto-Oncogênicas/metabolismo
DNA Complementar
Carcinoma Adenoide Cístico/metabolismo
Carcinoma Adenoide Cístico/patologia
Adenoma Pleomorfo/metabolismo
Adenoma Pleomorfo/patologia
Proteínas Proto-Oncogênicas c-kit/fisiologia
Proteínas Proto-Oncogênicas c-kit/metabolismo
MicroRNAs
Mutação
Limites: Humanos
Masculino
Feminino
Criança
Adolescente
Adulto
Pessoa de Meia-Idade
Idoso
Adulto Jovem
Responsável: BR30.1 - Biblioteca
BR30.1


  6 / 138 LILACS  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo SciELO Brasil
Texto completo
Id: lil-794560
Autor: Yousefzadeh, Nasibeh; Jeddi, Sajad; Alipour, Mohammad Reza.
Título: Effect of Fetal Hypothyroidism on Cardiac Myosin Heavy Chain Expression in Male Rats / O Efeito de Hipotireoidismo Fetal na Expressão da Miosina Cardíaca de Cadeia Pesada em Ratos Macho
Fonte: Arq. bras. cardiol;107(2):147-153, Aug. 2016. tab, graf.
Idioma: en.
Resumo: Abstract Background: Thyroid hormone deficiency during fetal life could affect the cardiac function in later life. The mechanism underlying this action in fetal hypothyroidism (FH) in rats has not been elucidated thus far. Objective: The aim of this study is to evaluation the effect of FH on cardiac function in male rats and to determine the contribution of α-myosin heavy chain (MHC) and β-MHC isoforms. Methods: Six pregnant female rats were randomly divided into two groups: The hypothyroid group received water containing 6-propyl-2-thiouracil during gestation and the controls consumed tap water. The offspring of the rats were tested in adulthood. Hearts from the FH and control rats were isolated and perfused with langendroff setup for measuring hemodynamic parameters; also, the heart mRNA expressions of α- MHC and β-MHC were measured by qPCR. Results: Baseline LVDP (74.0 ± 3.1 vs. 92.5 ± 3.2 mmHg, p < 0.05) and heart rate (217 ± 11 vs. 273 ± 6 beat/min, p < 0.05) were lower in the FH rats than controls. Also, these results showed the same significance in ±dp/dt. In the FH rats, β-MHC expression was higher (201%) and α- MHC expression was lower (47%) than control. Conclusion: Thyroid hormone deficiency during fetal life could attenuate normal cardiac functions in adult rats, an effect at least in part due to the increased expression of β-MHC to α- MHC ratio in the heart.

Resumo Fundamento: Deficiência de hormônio da tireoide durante vida fetal pode afetar a função cardíaca no futuro. O mecanismo subjacente dessa ação em hipotireoidismo fetal (HF) em ratos ainda não tem explicação. Objetivo: O objetivo desse estudo é avaliar o efeito de HF na função cardíaca em ratos macho e determinar a contribuição da α-miosina de cadeia pesada (α-MCP) e de isoformas β-MCP. Métodos: Seis ratos fêmea gestantes foram aleatoriamente divididas em dois grupos. O grupo do hipotireoidismo recebeu água contendo 6-propil-2-tiouracil durante a gestação, e os ratos no grupo de controle receberam água de torneira. Os filhotes dos ratos foram testados quando atingiram idade adulta. O coração dos ratos HF e controle foram isolados e submetidos a perfusão pelo método de Langendorff para medição de parâmetros hemodinâmicos. Também foram medidas as expressões de mRNA do coração de α-MCP e β-MCP por qPCR. Resultados: PVED de base (74,0 ± 3,1 vs. 92,5 ± 3,2 mmHg, p < 0,05) e pressão arterial (217 ± 11 vs. 273 ± 6 batidas/min, p < 0,05) mostraram-se mais baixas em ratos HF do que em ratos controle. Além disso, esses resultados mostraram a mesma significância em ±dp/dt. Em ratos HF, a expressão de β-MCP foi mais alta (201%) e a de α-MCP foi mais baixa (47%) do que em ratos controle. Conclusão: Deficiência de hormônio da tireoide durante a vida fetal pode enfraquecer funções cardíacas normais em ratos adultos, efeito devido em parte à expressão aumentada de β-MCP em relação a α-MCP no coração.
Descritores: Peso Corporal/efeitos dos fármacos
Cadeias Pesadas de Miosina/metabolismo
Hipotireoidismo Congênito/metabolismo
Miocárdio/metabolismo
-Propiltiouracila
Antitireóideos
Tiroxina/sangue
Tri-Iodotironina/sangue
RNA Mensageiro/metabolismo
Distribuição Aleatória
Ratos Wistar
Pressão Ventricular
DNA Complementar/metabolismo
Hipotireoidismo Congênito/induzido quimicamente
Hipotireoidismo Congênito/sangue
Modelos Animais de Doenças
Frequência Cardíaca
Limites: Animais
Masculino
Feminino
Gravidez
Responsável: BR1.1 - BIREME


  7 / 138 LILACS  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo SciELO Brasil
Texto completo
Id: biblio-1128390
Autor: Aboul-Soud, Mourad A. M.
Título: cDNA Cloning of a Bovine Insulin-like growth factor-1 from Egyptian Buffalos and Expression of its Recombinant Protein in Escherichia coli / Clonagem de cDNA de um fator-1 de crescimento semelhante à insulina bovina de búfalos egípcios e expressão de sua proteína recombinante em Escherichia coli
Fonte: Arq. bras. med. vet. zootec. (Online);72(2):523-534, Mar./Apr. 2020. ilus, graf.
Idioma: en.
Projeto: National Plan for Science, Technology and Innovation, King Abdulaziz City for Science and Technology, Kingdom of Saudi Arabia.
Resumo: Insulin-like growth factor-1 (IGF-1) is regarded as a crucial clinically significant therapeutic agent against several pathological conditions. Recently, recombinant DNA (rDNA) technology has enabled the production of many drugs of rDNA-origin including IGF-1. Securing a readily available supply of IGF-1 is invaluable to clinical research and biotechnological domains. In this work, the cloning of a full-length bovine IGF-1 cDNA and the successful expression of its cognate recombinant IGF-1 protein is reported. Single-strand cDNA was prepared from liver tissues, through the specific reverse transcription (RT) of IGF-1 mRNA. Subsequently, a PCR amplicon of ~543bp was successfully amplified. Recombinant pTARGET™ vector harboring IGF-1 insert was successfully cloned into competent E. coli JM109 cells. SDS-PAGE analysis revealed that the recombinant IGF-1 has been expressed at the expected size of 7.6kDa. The outcome provides a robust basis for transecting the recombinant pTARGETTM vector, harboring the IGF-1 cDNA insert, into mammalian cells. Optimal initial glucose concentration was found to be 10g/l with corresponding protein concentration of 6.2g/l. The proliferative biological activity crude recombinant IGF-1 protein was verified on HeLa cell lines. This is envisaged to facilitate large-scale production of recombinant IGF-1 protein, thereby enabling thorough investigation of its clinical and pharmaceutical effects.(AU)

O fator de crescimento semelhante à insulina-1 (IGF-1) é considerado um agente terapêutico clinicamente significativo contra várias condições patológicas. Recentemente, a tecnologia de DNA recombinante (rDNA) permitiu a produção de muitos medicamentos de origem rDNA, incluindo o IGF-1. Garantir um suprimento prontamente disponível de IGF-1 é inestimável para pesquisas clínicas e domínios biotecnológicos. Neste trabalho, relata-se a clonagem de um cDNA de IGF-1 bovino de comprimento total e a expressão bem-sucedida de sua proteína IGF-1 recombinante cognata. O cDNA de cadeia simples foi preparado a partir de tecidos do fígado, por meio da transcrição reversa específica (RT) do mRNA de IGF-1. Posteriormente, um amplificador de PCR de ~ 543pb foi amplificado com sucesso. O vetor pTARGET™ recombinante contendo a inserção de IGF-1 foi clonado com sucesso em células competentes E. coli JM109. A análise por SDS-PAGE revelou que o IGF-1 recombinante foi expresso no tamanho esperado de 7,6kDa. O resultado fornece uma base robusta para a transferência do vetor pTARGETTMTM recombinante, abrigando a inserção de cDNA de IGF-1 em células de mamíferos. Verificou-se que a concentração inicial ideal de glicose é 10g/L, com a concentração de proteína correspondente de 6,2g/L. A proteína IGF-1 recombinante bruta de atividade biológica proliferativa foi verificada nas linhas celulares HeLa. É previsto que isso facilite a produção da proteína IGF-1 recombinante em larga escala, permitindo, assim, uma investigação completa dos seus efeitos clínicos e farmacêuticos.(AU)
Descritores: Proteínas Recombinantes
Fator de Crescimento Insulin-Like I/genética
Búfalos/genética
Clonagem Molecular
DNA Complementar
Escherichia coli
-Reação em Cadeia da Polimerase em Tempo Real/veterinária
Limites: Animais
Responsável: BR68.1 - Biblioteca Virginie Buff D'Ápice


  8 / 138 LILACS  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
Id: lil-553372
Autor: Mello, Barbara Pereira de.
Título: Busca de marcadores moleculares tecido-associados em regiões transcritas não caracterizadas do genoma humano / Search for tissue-associated molecular markers in non-characterized transcribed regions of the human genome.
Fonte: São Paulo; s.n; 2009. 87 p. ilus, tab.
Idioma: pt.
Tese: Apresentada a Fundação Antônio Prudente para obtenção do grau de Doutor.
Resumo: Com foco na atividade transcricional do genoma humano, foi desenvolvido um trabalho de mestrado, em que construímos um microarranjo de cDNAs composto por sequências ORESTES resultantes do Projeto Genoma do Câncer Humano (FAPESP/LICR - HCGP) que não se alinharam com sequências de cDNA geradas por outros projetos. Este arranjo foi hibridizado contra cDNAs derivados de diferentes tecidos humanos, normais ou tumorais, resultando na identificação de 3.421 regiões transcritas do genoma humano (83,3% da plataforma) não descritas por outros projetos de sequênciamento como transcritos. Acreditando que parte dessas sequências pudessem representar RNAs não codificadores, variantes de splicing ou transcritos antisenso naturais fizemos uma reanálise computacional das sequências avaliadas no trabalho de mestrado e também uma análise de expressão diferencial das mesmas, buscando variações de expressão de transcritos tumor- e/ou tecido-associadas. Identificamos como possíveis ncRNAs 28% das sequências analisadas. Mil e sete sequências foram identificadas como diferencialmente expressas, sendo que 291 representam potenciais ncRNAs. Além disso, três potenciais marcadores tumorais de próstata foram validados por PCR em tempo real. Estudos adicionais de um desses marcadores, PCA3, revelaram um possível papel desse ncRNA na regulação do gene PRUNE2 e a existência de uma retenção intrônica não descrita na sequência de PCA3, aparentemente mais frequente em amostras normais de próstata. Também pudemos contribuir com análises iniciais de um potencial novo marcador de câncer de próstata a ser explorado para a complementação de marcadores já existentes, mas falhos em alguns aspectos. Um artigo referente a parte desse trabalho foi publicado no periódico Nucleic Acids Research (MELLO et al. 2009).

With focus on transcriptional activity of the human genome, we developed a master's work, in which we built a cDNA microarray composed of ORESTES sequences resulting from the Human Cancer Genome Project (FAPESP / LICR - HCGP) that did not align with cDNA sequences generated by other projects. This array was hybridized against cDNAs derived from different normal or tumor tissues, resulting in the identification of 3,421 transcribed regions of the human genome (83.3% of the slide) not described by other sequencing projects as transcripts. Believing that some of these sequences may represent non-coding RNAs, and splicing variants of natural antisense transcripts we did a new computational analysis of the sequences found in the master's work and also an analysis of differential expression of these sequences, seeking changes in expression of tumor- and/or tissue-associated transcripts. We identified as possible ncRNAs 28% of the sequences analyzed. One thousand and seven sequences were identified as differentially expressed, and from these 291 represent potential ncRNAs. In addition, three potential tumor markers for prostate cancer were validated by real-time PCR. Further studies of one of these markers, PCA3, revealed a possible role of this ncRNA in the regulation of PRUNE2 gene and the existence of an intron retention not described within PCA3 sequence, apparently more common in normal samples from prostate. We could also contribute with initial analysis of a potential new marker for prostate cancer to be explored in complementing currently markers not very acurated. An article containing part of this work was published in the journal Nucleic Acids Research (MELLO et al. 2009).
Descritores: Análise de Sequência
Biologia Computacional
Genoma Humano
Biomarcadores Tumorais
Neoplasias da Próstata
Perfilação da Expressão Gênica
-Alinhamento de Sequência
DNA Complementar
Responsável: BR30.1 - Biblioteca
BR30.1


  9 / 138 LILACS  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
Id: biblio-1087162
Autor: Jiménez-Guillen, Doribet; Pérez-Pascual, Daniel; Souza-Perera, Ramón; Zúñiga Aguilar, José Juan.
Título: Cloning and molecular characterization of a putative habanero pepper SERK1 cDNA expressed during somatic and zygotic embryogenesis
Fonte: Electron. j. biotechnol;41:48-55, sept. 2019. tab, ilus, graf.
Idioma: en.
Projeto: Consejo Nacional de Ciencia y Tecnología-FORDECyT; . Comisión Intersecretarial de Bioseguridad de los Organismos Genéticamente Modificado.
Resumo: Background: Plant gene homologs that control cell differentiation can be used as biotechnological tools to study the in vitro cell proliferation competence of tissue culture-recalcitrant species such as peppers. It has been demonstrated that SERK1 homologs enhance embryogenic competence when overexpressed in transformed tissues; therefore, cloning of a pepper SERK1 homolog was performed to further evaluate its biotechnological potential. Results: A Capsicum chinense SERK full-length cDNA (CchSERK1) was cloned and characterized at the molecular level. Its deduced amino acid sequence exhibits high identity with sequences annotated as SERK1 and predicted-SERK2 homologs in the genomes of the Capsicum annuum CM-334 and Zunla-1 varieties, respectively, and with SERK1 homologs from members of the Solanaceae family. Transcription of CchSERK1 in plant tissues, measured by quantitative RT-PCR, was higher in stems, flowers, and roots but lower in leaves and floral primordia. During seed development, CchSERK1 was transcribed in all zygotic stages, with higher expression at 14 days post anthesis. During somatic embryogenesis, CchSERK1 was transcribed at all differentiation stages, with a high increment in the heart stage and lower levels at the torpedo/cotyledonal stages. Conclusion: DNA sequence alignments and gene expression patterns suggest that CchSERK1 is the C. chinense SERK1 homolog. Significant levels of CchSERK1 transcripts were found in tissues with cell differentiation activities such as vascular axes and during the development of zygotic and somatic embryos. These results suggest that CchSERK1 might have regulatory functions in cell differentiation and could be used as a biotechnological tool to study the recalcitrance of peppers to proliferate in vitro.
Descritores: Capsicum/genética
Clonagem Molecular
-Técnicas In Vitro
Biotecnologia
Expressão Gênica
Diferenciação Celular
Genes de Plantas
DNA Complementar/genética
Solanaceae/genética
Proteínas de Arabidopsis
Proliferação de Células
Desenvolvimento Embrionário
Reação em Cadeia da Polimerase em Tempo Real
Responsável: CL1.1 - Biblioteca Central


  10 / 138 LILACS  
              first record previous record
seleciona
para imprimir
Fotocópia
Texto completo SciELO Brasil
Tendler, Miriam
Texto completo
Id: lil-295892
Autor: Ramos, Celso Raul Romero; Vilar, Mônica Magno; Nascimento, Ana Lúcia Tabet Oller; Ho, Paulo Lee; Thaumaturgo, Nilton; Edelenyi, Ricardo; Almeida, Marília; Dias, Waldely de Oliveira; Diogo, Catia Maria; Tendler, Miriam.
Título: r-Sm14 - pRSETA efficacy in experimental animals
Fonte: Mem. Inst. Oswaldo Cruz;96(suppl):131-135, Sept. 2001. ilus, tab.
Idioma: en.
Resumo: Previous studies carried out with Sm14 in experimental vaccination against Schistosoma mansoni or Fasciola hepatica infections were performed with recombinant Sm14 (rSm14) produced in Escherichia coli by the pGEMEX system (Promega). The rSm14 was expressed as a 40 kDa fusion protein with the major bacteriophage T7 capsid protein. Vaccination experiments with this rSm14 in animal models resulted in consistent high protective activity against S. mansoni cercariae challenge and enabled rSm14 to be included among the vaccine antigens endorsed by the World Health Organization for phase I/II clinical trials. Since the preparation of pGEMEX based rSm14 is time consuming and results in low yield for large scale production, we have tested other E. coli expression systems which would be more suitable for scale up and downstream processing. We expressed two different 6XHis-tagged Sm14 fusion proteins in a T7 promoter based plasmids. The 6XHis-tag fusions allowed rapid purification of the recombinant proteins through a Ni+2-charged resin. The resulted recombinant 18 and 16 kDa proteins were recognized by anti-Sm14 antibodies and also by antiserum against adult S. mansoni soluble secreted/excreted proteins in Western-Blot. Both proteins were also protective against S. mansoni cercariae infection to the same extent as the rSm14 expressed by the pGEMEX system
Descritores: Schistosoma mansoni/imunologia
Proteínas Recombinantes
Anticorpos Anti-Helmínticos/fisiologia
Proteínas de Helminto/fisiologia
-Plasmídeos
Proteínas Recombinantes/isolamento & purificação
Proteínas de Transporte
Proteínas de Helminto/isolamento & purificação
Western Blotting
Sequência de Aminoácidos
Vacinação
DNA Complementar
Modelos Animais
Eletroforese em Gel de Poliacrilamida
Escherichia coli
Ácidos Graxos
Limites: Animais
Feminino
Camundongos
Tipo de Publ: Research Support, Non-U.S. Gov't
Responsável: BR1.1 - BIREME



página 1 de 14 ir para página                         
   


Refinar a pesquisa
  Base de dados : Formulário avançado   

    Pesquisar no campo  
1  
2
3
 
           



Search engine: iAH v2.6 powered by WWWISIS

BIREME/OPAS/OMS - Centro Latino-Americano e do Caribe de Informação em Ciências da Saúde