Consulta: creatorFacets:"Rego,E.M."
Registros recuperados: 7
Data/hora: 11/06/2024 15:26:35

Immunophenotype of normal and leukemic bone marrow B-precursors in a Brazilian population. A comparative analysis by quantitative fluorescence cytometry
Provedor de dados: 56
Autores: Rego,E.M.; Garcia,A.B.; Carneiro,J.J.; Falcão,R.P.
The distinction between normal and leukemic bone marrow (BM) B-precursors is essential for the diagnosis and treatment monitoring of acute lymphoblastic leukemia (ALL). In order to evaluate the potential use of quantitative fluorescence cytometry (QFC) for this distinction, we studied 21 normal individuals and 40 patients with CD10+ ALL. We characterized the age-related changes of the CD10, CD19, TdT, CD34 and CD79a densities in normal and leukemic BM. Compared to normal adults, the B-precursors from normal children expressed significantly lower values of CD34-specific antibody binding capacity (SABC) (median value of 86.6 vs 160.2 arbitrary units (a.u.) in children and adults, respectively). No significant age-related difference was observed in the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Acute lymphoblastic leukemia; Lymphocytes; Quantitative fluorescence cytometry; Flow cytometry; Age-related changes.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2001000200005

35 years of the Brazilian Journal of Medical and Biological Research
Provedor de dados: 56
Autores: Rego,E.M.; Pereira Leite,J.; Bensenor,I.; Chammas,R.; Nogueira de Francischi,J.; da Luz,P.L.
The authors pay homage to the three founders of the Brazilian Journal of Medical and Biological Research Profs. Lewis Joel Greene, Sérgio Henrique Ferreira and Eduardo Moacyr Krieger for their vision and commitment to divulge the scientific production of developing countries.
Tipo: Info:eu-repo/semantics/other
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2017000100101

Biological X-ray irradiator characterization for use with small animals and cells
Provedor de dados: 56
Autores: Bruno,A. Colello; Mazaro,S.J.; Amaral,L.L.; Rego,E.M.; Oliveira,H.F.; Pavoni,J.F.
This study presents the characterization of an X-ray irradiator through dosimetric tests, which confirms the actual dose rate that small animals and cells will be exposed to during radiobiological experiments. We evaluated the linearity, consistency, repeatability, and dose distribution in the positions in which the animals or cells are placed during irradiation. In addition, we evaluated the performance of the X-ray tube (voltage and tube operating current), the radiometric survey (leakage radiation) and safety devices. The irradiator default setting was established as 160 kV and 25 mA. Tests showed that the dose rate was linear overtime (R2=1) and remained stable for long (constant) and short (repeatability) intervals between readings. The mean dose rate...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: X-ray irradiator; Dosimetric characterization; Radiotherapy; Dosimetry; Radiochromic film.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2017000300607

The role of micro-ribonucleic acids in normal hematopoiesis and leukemic T-lymphogenesis
Provedor de dados: 56
Autores: Slavov,S.N.; Gimenes Teixeira,H.L.; Rego,E.M.
Micro-ribonucleic acids (microRNAs) are small molecules containing 20-23 nucleotides. Despite their small size, it is likely that almost every cellular process is regulated by them. Moreover, aberrant microRNA expression has been involved in the development of various diseases, including cancer. Although many data are available about the role of microRNAs in various lymphoproliferative disorders, their impact on the development of acute lymphoblastic leukemia of T-cell progenitors is largely unknown. In this review, we present recent information about how specific microRNAs are expressed and regulated during malignant T-lymphopoiesis and about their role during normal hematopoiesis.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: MicroRNAs; Gene expression; Leukemia; Acute lymphoblastic leukemia; T cells.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2010000700003

Asynchronous expression of myeloid antigens in leukemic cells in a PML/RARalpha transgenic mouse model
Provedor de dados: 56
Autores: Santana,B.A.A.; Pintão,M.C.; Lima,R.S. Abreu e; Scheucher,P.S.; Santos,G.A.S.; Garcia,A.B.; Falcão,R.P.; Rego,E.M.
Acute promyelocytic leukemia (APL) is characterized by the expansion of blasts that resemble morphologically promyelocytes and harbor a chromosomal translocation involving the retinoic acid receptor a (RARa) and the promyelocytic leukemia (PML) genes on chromosomes 17 and 15, respectively. The expression of the PML/RARa fusion gene is essential for APL genesis. In fact, transgenic mice (TM) expressing PML/RARa develop a form of leukemia that mimics the hematological findings of human APL. Leukemia is diagnosed after a long latency (approximately 12 months) during which no hematological abnormality is detected in peripheral blood (pre-leukemic phase). In humans, immunophenotypic analysis of APL blasts revealed distinct features; however, the precise...
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Acute promyelocytic leukemia; Acute myelogenous leukemia; Transgenic mice; Flow cytometry; Leukemogenesis.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2006000500008

Telomere length analysis in monoclonal B-cell lymphocytosis and chronic lymphocytic leukemia Binet A
Provedor de dados: 56
Autores: Furtado,F.M.; Scheucher,P.S.; Santana,B.A.; Scatena,N.F.; Calado,R.T.; Rego,E.M.; Matos,D.M.; Falcão,R.P.
Monoclonal B-cell lymphocytosis (MBL) is an asymptomatic clinical entity characterized by the proliferation of monoclonal B cells not meeting the diagnosis criteria for chronic lymphocytic leukemia (CLL). MBL may precede the development of CLL, but the molecular mechanisms responsible for disease progression and evolution are not completely known. Telomeres are usually short in CLL and their attrition may contribute to disease evolution. Here, we determined the telomere lengths of CD5+CD19+ cells in MBL, CLL, and healthy volunteers. Twenty-one CLL patients, 11 subjects with high-count MBL, and 6 with low-count MBL were enrolled. Two hundred and sixty-one healthy volunteers aged 0 to 88 years were studied as controls. After diagnosis confirmation, a flow...
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Chronic lymphocytic leukemia; Monoclonal B-cell lymphocytosis; Telomere length.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2017000500603

CCAAT/enhancer-binding protein alpha (CEBPA) gene haploinsufficiency does not alter hematopoiesis or induce leukemia in Lck-CALM/AF10 transgenic mice
Provedor de dados: 56
Autores: Lange,A.P.; Almeida,L.Y.; Araújo Silva,C.L.; Scheucher,P.S.; Chahud,F.; Krause,A.; Bohlander,S.K.; Rego,E.M.
Although rare, CALM/AF10 is a chromosomal rearrangement found in immature T-cell acute lymphoblastic leukemia (T-ALL), acute myeloid leukemia, and mixed phenotype acute leukemia of T/myeloid lineages with poor prognosis. Moreover, this translocation is detected in 50% of T-ALL patients with gamma/delta T cell receptor rearrangement, frequently associated with low expression of transcription factor CCAAT/enhancer-binding protein alpha (CEBPA). However, the relevance of CEBPA low expression for CALM/AF10 leukemogenesis has not yet been evaluated. We generated double mutant mice, which express the Lck-CALM/AF10 fusion gene and are haploinsufficient for the Cebpa gene. To characterize the hematopoiesis, we quantified hematopoietic stem cells, myeloid...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Leukemia; CEBPA; CALM/AF10; Transgenic mice.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2019000600604