Comparative study of lymphocytes from individuals that were vaccinated and unvaccinated against the pandemic 2009-2011 H1N1 influenza virus in Southern Brazil
Rev. Soc. Bras. Med. Trop
; 48(5): 514-523, Sept.-Oct. 2015. tab, graf
Artigo
em Inglês
| LILACS
| ID: lil-763338
Biblioteca responsável:
BR1.1
ABSTRACT
ABSTRACTINTRODUCTION:
While no single factor is sufficient to guarantee the success of influenza vaccine programs, knowledge of the levels of immunity in local populations is critical. Here, we analyzed influenza immunity in a population from Southern Brazil, a region with weather conditions that are distinct from those in the rest of country, where influenza infections are endemic, and where greater than 50% of the population is vaccinated annually.METHODS:
Peripheral blood mononuclear cells were isolated from 40 individuals. Of these, 20 had received the H1N1 vaccine, while the remaining 20 were unvaccinated against the disease. Cells were stimulated in vitro with the trivalent post-pandemic influenza vaccine or with conserved major histocompatibility complex I (MHC I) peptides derived from hemagglutinin and neuraminidase. Cell viability was then analyzed by [3-(4,5-dimethylthiazol-2-yl)-2,5- diphenyltetrazolium bromide)]-based colorimetric assay (MTT), and culture supernatants were assayed for helper T type 1 (Th1) and Th2-specific cytokine levels.RESULTS:
Peripheral blood lymphocytes from vaccinated, but not unvaccinated, individuals exhibited significant proliferation in vitro in the presence of a cognate influenza antigen. After culturing with vaccine antigens, cells from vaccinated individuals produced similar levels of interleukin (IL)-10 and interferon (IFN)-γ, while those from unvaccinated individuals produced higher levels of IFN-γ than of IL-10.CONCLUSIONS:
Our data indicate that peripheral blood lymphocytes from vaccinated individuals are stimulated upon encountering a cognate antigen, but did not support the hypothesis that cross-reactive responses related to previous infections can ameliorate the immune response. Moreover, monitoring IL-10 production in vaccinated individuals could comprise a valuable tool for predicting disease evolution.
Texto completo:
Disponível
Coleções:
Bases de dados internacionais
Contexto em Saúde:
Agenda de Saúde Sustentável para as Américas
/
ODS3 - Saúde e Bem-Estar
Problema de saúde:
Objetivo 9: Redução de doenças não transmissíveis
/
Objetivo 10: Doenças transmissíveis
/
Meta 3.3: Acabar com as doenças tropicais negligenciadas e combater as doenças transmissíveis
/
Meta 3.4: Reduzir as mortes prematuras devido doenças não transmissíveis
Base de dados:
LILACS
Assunto principal:
Vacinas contra Influenza
/
Linfócitos
/
Influenza Humana
/
Vírus da Influenza A Subtipo H1N1
/
Anticorpos Antivirais
Tipo de estudo:
Estudo observacional
/
Estudo de prevalência
/
Estudo prognóstico
/
Fatores de risco
Limite:
Adulto
/
Humanos
País/Região como assunto:
América do Sul
/
Brasil
Idioma:
Inglês
Revista:
Rev. Soc. Bras. Med. Trop
Assunto da revista:
Medicina Tropical
Ano de publicação:
2015
Tipo de documento:
Artigo
País de afiliação:
Brasil
Instituição/País de afiliação:
Centro Universitário Franciscano/BR