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Memórias do Instituto Oswaldo Cruz
Fundação Oswaldo Cruz, Fiocruz
ISSN: 1678-8060
EISSN: 1678-8060
Vol. 103, No. 4, 2008, pp. 401-404
Bioline Code: oc08069
Full paper language: English
Document type: Short Communication
Document available free of charge

Memórias do Instituto Oswaldo Cruz, Vol. 103, No. 4, 2008, pp. 401-404

 en Preliminary results in the immunodiagnosis of tuberculosis in children based on T cell responses to ESAT-6 and PPD antigens
Van-Lume, Daniele SM; de Souza, Joelma R; Melo, Wlademir G; Melo, Victor L; Cabral, Marta ML; Rego, Joakim C; Schindler, Haiana C; Abath, Frederico GC & Montenegro, Silvia ML

Abstract

The aim of this work was to study the difference in interferon gamma (IFN-γ) production by T lymphocytes after early secretory antigen target 6 (ESAT-6) or purified protein derivate (PPD) stimulation in whole blood culture supernatants from children with suspected tuberculosis (TB) disease (n = 21), latent TB infection (n = 16) and negative controls (NC) (n = 22) from an endemic area in Brazil. The concentration of IFN-γ (pg/ml) was measured by enzyme linked immunosorbent assay and the differences in the IFN-γ levels for each group were compared and evaluated using an unpaired Student's t-test; p values < 0.05 were considered significant. Measurement of IFN-γ levels after ESAT-6 stimulation raised the possibility of early diagnosis in the latent TB group (p = 0.0030). Nevertheless, the same group showed similar responses to the NC group (p > 0.05) after PPD stimulation. The IFN-γ assay using ESAT-6 as an antigenic stimulus has the potential to be used as a tool for the immunodiagnosis of early TB in children.

Keywords
tuberculosis in children - immunodiagnosis - ELISA - ESAT-6 - PPD

 
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