Emprego da citometria de fluxo na avalia??o do perfil imunofenot?pico de pacientes com leucemia linfoc?tica cr?nica

• Main Author: Lopes, Maria Cleide de Araujo
• Other Authors: CPF:10861203453
• Format: Others
• Language: Portuguese
• Published: Universidade Federal do Rio Grande do Norte 2014
• Subjects: Leucemia linf?c?tica cr?nica; Imunofenotipagem; Citometria de fluxo; Chronic lymphocytic leukemia; Flow cytometry; Immunophenotyping; CNPQ::CIENCIAS DA SAUDE::FARMACIA
• Online Access: http://repositorio.ufrn.br:8080/jspui/handle/123456789/13457

Made available in DSpace on 2014-12-17T14:16:26Z (GMT). No. of bitstreams: 1 MariaCAL_DISSERT.pdf: 1577232 bytes, checksum: 21520a348f865554e71416a87d0342f6 (MD5) Previous issue date: 2010-02-24 === Chronic lymphocytic leukemia (B-CLL) is a clonal proliferation of mature B lymphocytes characterized by indolent clinical course. Biologically this clonallity is characterized by low expression of surface immunoglobulin (sIg) with restriction to a single immunoglobulin light chain associated with high expression of CD5 antigen and positivity to B cell antigens lymphocytes such as CD19, CD20 and CD23 and negativity to FMC7. The immunological profile and morphological analysis of lymphoid cells are the main means for the differential diagnosis of B-CLL from other chronic lymphoproliferative diseases. The aim of this study was to evaluate the expression pattern of a variety of membrane antigens in leukemic cells originating from patients with B-CLL. In this study, peripheral blood samples from 80 patients with B-CLL were analyzed by multiparametric flow cytometry in addition to routine hematologic exams, using a panel of monoclonal antibodies (MoAb): CD45/CD14, CD3/CD19/CD45, CD4/CD8 / CD3, CD20/CD5/CD3, CD3/CD16-56/CD45, CD2/CD7, FMC7/CD23, CD103/CD22/CD20, HLADR/CD38, CD10/CD19, CD1a, CD11b and also IgM/gD, kappa and lambda immunoglobulin light chains for the detection of surface immunoglobulin and clonal restriction for immunoglobulin light chain. The Hematological data were obtained from the hematological analyzer and cytomorphological analysis in blood film stained by Leishmann. The study samples consisted of 45 men and 35 women, ages ranging from 55 to 84 years (mean 65 years). Complete white blood count showed count ranging from 10.0 to 42.0 x 109/l. (mean 50.0 x 109/l) and lymphocytes count greater than 5.0 x 109/l in all cases. The neoplastic cells displayed B-CLL phenotype (CD5+/CD19+/CD20+/HLADR+/CD23+) in the vast majority of the cases, associated to failed to stain for T cell markers (CD1a, CD2, CD4, CD3, CD7, CD8), CD103, CD14 and FMC7. Leukemic cells of most patients also expressed low intensity of IgM and IgD with restricted kappa light chain, in most cases (59,7%). This observation highlights the importance of immunophenotyping for correct diagnosis of chronic lymphoproliferative syndromes and the panel of MoAb used was sufficient for diagnostic confirmation of B-CLL === A leucemia linfoc?tica cr?nica (LLC-B) ? uma prolifera??o clonal de linf?citos B maduros caracterizada por curso cl?nico indolente. Biologicamente esta clonalidade ? caracterizada pela baixa express?o de imunoglobulina de superf?cie (sIg) com restri??o a uma ?nica cadeia leve de imunoglobulina, associada a alta express?o do ant?geno CD5 e positividade a ant?genos relacionados a linf?citos B tais como: CD19, CD20 e CD23 e negatividade ao FMC7. O perfil imunol?gico e a an?lise morfol?gica das c?lulas linf?ides s?o os principais meios para o diagn?stico diferencial LLC-B de outras doen?as linfoproliferativas cr?nicas. O objetivo deste estudo foi avaliar o padr?o de express?o de uma variedade de ant?genos de membrana em c?lulas leuc?micas procedentes de pacientes com LLC-B. No presente estudo, amostras de sangue perif?rico de 80 pacientes com LLC-B foram analisados por citometria de fluxo multiparam?trica juntamente com an?lises hematol?gicas de rotina, com um painel de anticorpos monoclonais (AcMo): CD45/CD14, CD3/CD19/CD45, CD4/CD8/CD3, CD20/CD5/CD3, CD3/CD16-56/CD45, CD2/CD7, FMC7/CD23, CD103/CD22/CD20, HLADR/CD38, CD10/CD19, CD1a, CD11b al?m de IgM/gD, e cadeias leves das imunoglobulinas kappa e lambda visando a detec??o sIg e do perfil de restri??o clonal das cadeia leves das imunoglobulinas. Os dados hematol?gicos foram obtidos a partir do analisador hematol?gico e as an?lises citomorfologicas em distens?o sangu?nea coradas pelo Leishmann. As amostras deste estudo foram procedentes de 45 homens e 35 mulheres, com idade variando entre 55 e 84 anos (m?dia de 65 anos). O hemograma revelou contagem total de c?lulas branca variando de 10,0-42,0 x 109/l. (m?dia de 50,0 x 109/l) e contagem de linf?citos superior a 5,0 x 109/l em todos os casos. As c?lulas neopl?sicas demonstraram um fen?tipo caracter?stico para LLC-B (CD5+/CD19+/CD20+/HLADR+/CD23+) na maioria dos casos, associados ? aus?ncia de express?o para marcadores de c?lulas T (CD1a, CD2, CD4, CD3, CD7, CD8), CD103, CD14 e FMC7. As c?lulas leuc?micas da maioria dos pacientes expressaram tamb?m IgM e IgD de baixa intensidade com predom?nio da restri??o da cadeia leve kappa, na maioria dos casos (59,7%). A presente observa??o destaca a import?ncia da imunofenotipagem para o correto diagn?stico das s?ndromes linfoproliferativas cr?nicas e sendo o painel de AcMo utilizado capaz de estabelecer a confirma??o diagn?stica da B-CLL