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Master's Dissertation
DOI
https://doi.org/10.11606/D.42.2007.tde-18102007-153435
Document
Author
Full name
Felipe Pessoa de Melo Hermida
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2007
Supervisor
Committee
Andrade Junior, Heitor Franco de (President)
Ferreira, Marcelo Urbano
Moraes, Sandra do Lago
Title in Portuguese
Células progenitoras CD34+ durante a ampliação esplênica na malária experimental de roedores.
Keywords in Portuguese
Baço
CD34+
Células tronco
Hematopoiese
Malária de roedores
Progenitoras hematopoiéticas
Abstract in Portuguese
A malária é uma infecção causada por plasmódios, cujo controle depende do baço, o responsável pelo clareamento dos eritrócitos parasitos. O aumento da parasitemia induz uma ampliação do baço para resolver a infecção, onde participam células precursoras que apresentam CCD34+ na sua superfície. Estudamos a distribuição e a quantidade de células CD34+ em baços de roedores durante malárias de roedores, para compreender sua participação na ampliação do baço e no controle da infecção. Camundongos C57Bl/6j infectados com as cepas AJ e CR de Plasmodium chabaudi, e com a cepa ANKA de Plasmodium berghei, tiveram seus baços removidos e encaminhados para histologia e citometria de fluxo. A distribuição das células CD34+ mostrou-se mais intensa no 4º dia p.i. e menos intensa no 8º dia p.i.. As células CD34+ livres, por citometria de fluxo, surgem com uma onda no 4º dia p.i.. Sua quantidade é similar entre os modelos de P. chabaudi, mas diferente no P. berghei. Neste trabalho, o influxo de células CD34+ no baço não se relaciona com o controle da infecção.
Title in English
CD34+ progenitor cells during spleen amplification in experimental rodent malaria.
Keywords in English
CD34+
Hematopoiesis
Hematopoietic progenitor
Rodent malaria
Spleen
Stem cell
Abstract in English
Malaria is caused by Plasmodium sp., which control depends on the spleen, responsible for parasite clearing. The increase of parasitemia implies in spleen amplification to control the infection, with participation of CD34+ cells. We studied the distribution and amount of CD34+ cells in spleen during rodent malaria, to define the role of those cells in spleen amplification and infection control. C57Bl/6j mice were infected with strains CR and AJ of Plasmodium chabaudi, and ANKA strain of Plasmodium berghei. The spleen was removed and processed for histology and flow cytometry. Spleen CD34+ cells was increased in 4th day, p.i., and decreases in 8th day p.i. in all models. By flow cytometry, free CD34+ cells appears as a wave in the 4th day p.i.. P. chabaudi models presented the same level of those cells, which was larger in the P. berghei mice. In this work, increase of spleen CD34+ cells do not correlate with infection control.
 
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Publishing Date
2007-10-31
 
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