Effector memory T-cells dominate immune responses in tuberculosis treatment: antigen or bacteria persistence?
DESIGN: A total of 38 healthy subjects, mean age 70 ± 13 years, with a history of previously treated TB were recruited. Peripheral blood mononuclear cells were collected and analysed as a batch by ELISpot. Representative samples with high reactivities were further immunophenotypically characterised.
RESULTS: No differences between the studied groups were detected with regard to the frequencies of reactive lymphocytes. The dominant immunophenotypic profile of the representative responders, irrespective of the treatment schemes, was CD4+CD45RO+CD45RA−CD27−CD28−CCR7−, compatible with the fast reacting effector memory T-cell lineage (TEM).
CONCLUSION: Specific TEM cells persist even in subjects treated for TB decades ago with modern anti-tuberculosis chemotherapy. Additional studies are needed to address the question of what drives the survival of TEM after adequate treatment: persistence of antigens or bacteria.
Document Type: Regular Paper
Affiliations: 1: Haartman Institute, Department of Bacteriology and Immunology, University of Helsinki, Helsinki, Finland 2: Länsi-Uusimaa Hospital, Tammisaari, Finland 3: Haartman Institute, Department of Bacteriology and Immunology, University of Helsinki, Helsinki, Finland; and Division of Clinical Microbiology, HUSLAB Laboratory Services, Helsinki University Hospital, Helsinki, Finland
Publication date: 2010-03-01
The International Journal of Tuberculosis and Lung Disease publishes articles on all aspects of lung health, including public health-related issues such as training programmes, cost-benefit analysis, legislation, epidemiology, intervention studies and health systems research. The IJTLD is dedicated to the continuing education of physicians and health personnel and the dissemination of information on tuberculosis and lung health world-wide.
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