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Master's Dissertation
DOI
https://doi.org/10.11606/D.10.2009.tde-10082010-180933
Document
Author
Full name
Thaís Martins Chucri
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2009
Supervisor
Committee
Kfoury Junior, José Roberto (President)
Bastos, Paula Andrea de Santis
Rici, Rose Elí Grassi
Title in Portuguese
Imunofenotipagem de leucócitos da placenta bovina
Keywords in Portuguese
Bovinos
Gestação
Leucócitos
Placenta
Tolerância materno-fetal
Abstract in Portuguese
Linfócitos e macrófagos são os principais tipos de leucócitos envolvidos no processo de tolerância materno-fetal. Os linfócitos são divididos em sub-populações de acordo com sua função e fenótipo, apesar de serem morfologicamente semelhantes. Seus tipos incluem os linfócitos T, linfócitos B e natural killers (NK). Macrófagos são células que derivam da migração dos monócitos sangüíneos para o tecido. Na placenta, os macrófagos desempenham um papel importante na regulação da apoptose, prejudicial para o desenvolvimento do embrião, e no processo de apresentação antigênica. Pouco se sabe sobre esses leucócitos na placenta bovina, como sua quantidade e onde estão presentes. Desta maneira, este trabalho tem por objetivo principal identificar as populações de linfócitos e macrófagos presentes na placenta bovina utilizando marcadores específicos e citometria de fluxo. Neste estudo, foram utilizados amostras de placentônios e região intercaruncular de vacas nos três diferentes trimestres da gestação (cinco animais de cada trimestre). As suspensões celulares obtidas foram incubadas com anticorpos monoclonais anti-CD3, anti-CD8, anti-(CD14), e anti-CD335 (uNK) e avaliados pela citometria de fluxo. No placentônio, no primeiro trimestre da gestação, a porcentagem média de células marcadas CD3+ foi de 2,37%, CD8+, 2,39%, CD14+, 1,16% e CD335+, 0,78%. Para a região intercaruncular, a porcentagem de células CD3+ foi 3,43%, 4,41% CD8+, CD14+ 3,91% e CD335+ 0,56%. No segundo trimestre gestacional, o placentônio apresentou 0,63% de células positivas para CD3+, 0,62% para CD8+, 0,34% para CD14+ e 0,55% para CD335+. Na região interplacentomal a porcentagem de células marcadas com CD3+ foi 1,59%, 1,25% para CD8+, 0,38% para CD14+ e 0,39% para CD335+. No terceiro trimestre gestacional, o placentônio apresentou 0,72% de células marcadas para CD3+, 0,75% para CD8+, 1,05% para CD14+ e 0,77% para CD335+. Na região interplacentomal a porcentagem de células marcadas para CD3+ foi 1,59%, 1,50% para CD8+, 0,60% para CD14+ e 0,48% para CD335+. Com base nos resultados apresentados, podemos concluir que a população de leucócitos na 11 placenta bovina é menos numerosa quando comparada às outras espécies como camundongos e humanos, provavelmente pelo tipo de placenta sinepiteliocorial que constitui uma barreira significativa para o sistema imunológico materno, diminuindo drasticamente a exposição do concepto a ele.
Title in English
Immunophenotyping of leukocytes in the bovine placenta
Keywords in English
Bovine
Leukocytes
Maternal-fetal tolerance
Placenta
Pregnancy
Abstract in English
Lymphocytes and macrophages are the main types of leukocytes involved in the maternal-fetal process of tolerance. Lymphocytes may be divided in subpopulations according to their function and phenotype, although being morphologically similar. Its types include the T lymphocyte, B lymphocyte and natural killers (NK). Macrophages are cells that derive from the migration of blood monocytes to the tissue. In the placenta, macrophages play an important role in the regulation of apoptosis which is deleterious to the development of the embryo and in the process of antigen presentation. There are very few references regarding the presence and quantity of leukocytes in the bovine placenta, therefore this project aims to identify lymphocytes and macrophages populations in the bovine placenta by using specific markers and flow cytometry. In this study placentomes and interplacentomal regions of cows in the three trimesters of pregnancy (five animals of each trimester) were used. Cells were incubated with the following monoclonal antibodies: anti-CD3, anti-CD8, anti-CD14,) and anti-CD335 (uNK) and evaluated by flow cytometry. In the first trimester of pregnancy, for the placentome, the average percentage of cells marked CD3+ was 2.37%, CD8+ 2.39%, , CD14+ 1.16% and CD335+ 0.78%. For the interplacentomal region the percentage of CD3+ was 3.43%, CD8+ 4.41%, CD14+ 3.91%, and CD335+ 0.56%. In second trimester of pregnancy, the placentome presented 0.63% of cells marked with CD3+, 0.62% of CD8+, 0.34% of CD14+ and 0.55% of CD335+. In the interplacentomal region the percentage of cells marked with CD3+ was of 1.59%, 1.25% of CD8+, 0.38% of CD14% and 0.39% of CD335+. In the third trimester of pregnancy, the placentomes had presented 0.72% of cells marked with CD3+, 0.75% of CD8+, 1.05% of CD14+ and 0.77% of CD335+. In the interplacentomal region the percentage of cells marked with CD3+ was of 1.59%, 1.50% of CD8+, 0.60% of CD14+ and 0.48% of CD335+. Based on the presented results, we can conclude that the leukocytes population in the bovine placenta is less 13 numerous than those described for other species like mouse and human, probably because it is a sinepithelial type placenta that constitutes a significant barrier to the maternal immunological system, diminishing drastically the conceptus antigen exposition to it.
 
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Publishing Date
2011-01-10
 
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