Please use this identifier to cite or link to this item: https://www.arca.fiocruz.br/handle/icict/32123
Title: The sample processing time interval as an influential factor in flow cytometry analysis of lymphocyte subsets
Authors: Santos, Ana Paula dos
Bertho, Álvaro Luiz
Martins, Reinaldo de Menezes
Marcovistz, Rugimar
Affilliation: Fundação Oswaldo Cruz. Instituto de Tecnologia em Imunobiológicos. Rio de Janeiro, RJ, Brasil.
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Departamento de Imunologia. Laboratório de Imunoparasitologia. Rio de Janeiro, RJ, Brasil.
Fundação Oswaldo Cruz. Instituto de Tecnologia em Imunobiológicos. Rio de Janeiro, RJ, Brasil.
Fundação Oswaldo Cruz. Instituto de Tecnologia em Imunobiológicos. Rio de Janeiro, RJ, Brasil.
Abstract: The objective of this paper is to propose a protocol to analyze blood samples in yellow fever 17DD vaccinated which developed serious adverse events. We investigated whether or not the time between sample collection and sample processing could interfere in lymphocyte subset percentage, for it is often impossible to analyze blood samples immediately after collection due to transport delay from collection places to the flow cytometry facility. CD4+CD38+ T, CD8+CD38+ T, CD3+ T, CD19+ B lymphocyte subsets were analyzed by flow cytometry in nine healthy volunteers immediately after blood collection and after intervals of 24 and 48 h. The whole blood lysis method and gradient sedimentation by Histopaque were applied to isolate peripheral blood mononuclear cells for flow cytometry analyses. With the lysis method, there was no significant change in lymphocyte subset percentage between the two time intervals (24 and 48 h). In contrast, when blood samples were processed by Histopaque gradient sedimentation, time intervals for sample processing influenced the percentage in T lymphocyte subsets but not in B cells. From the results obtained, we could conclude that the whole blood lysis method is more appropriate than gradient sedimentation by Histopaque for immunophenotyping of blood samples collected after serious adverse events, due to less variation in the lymphocyte subset levels with respect to the time factor.
Keywords: Yellow fever
Flow cytometry
Lymphocyte subsets
Issue Date: 2007
Citation: SANTOS, Ana Paula dos et al . The sample processing time interval as an influential factor in flow cytometry analysis of lymphocyte subsets. Memórias do Instituto Oswaldo Cruz, Rio de Janeiro, v. 102, n. 1, p. 117-120, Feb. 2007.
DOI: 10.1590/S0074-02762007000100020
ISSN: 1678-8060
Copyright: open access
Appears in Collections:IOC - Artigos de Periódicos
Biomanguinhos - Artigos de Periódicos

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