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*
Department of Immunology, Central Institute for Tuberculosis of Russian Academy of Medical Sciences; and
Laboratory for Immunochemistry, Shemyakin and Ovchinnikov Institute of Bioorganic Chemistry of Russian Academy of Sciences, Moscow, Russia
Genetic control of susceptibility to tuberculosis (TB) is being
intensively studied, and immune responses to mycobacteria are
considerably well characterized. However, it remains largely unknown
which parameters of response distinguish resistant and susceptible TB
phenotypes. Mice of I/St and A/Sn inbred strains and (A/Sn x
I/St)F1 hybrids were previously categorized as,
respectively, susceptible, resistant, and hyperresistant to
Mycobacterium tuberculosis-triggered disease. In the
present work we compared parameters of lung T cell activation and
response following M. tuberculosis challenge. In all
mice, the disease progression was accompanied by a marked accumulation
in the lungs of activated CD4+
(CD44high/CD45RBlow) and CD8+
(CD44high/CD45RB+) T cells capable of secreting
IFN-
and of activating macrophages for NO production and
mycobacterial growth inhibition. However, significantly more
CD8+ T cells were accumulated in the lungs of resistant
A/Sn and F1 compared with I/St mice. About 80% A/Sn and
F1 CD8+ cells expressed
CD44high/CD45RB+ phenotype, while about 40%
I/St CD8+ cells did not express CD45RB marker at week 5 of
infection. In contrast, in susceptible I/St mice lung CD4+
cells proliferated much more strongly in response to mycobacterial
sonicate, and a higher proportion of these cells expressed CD95 and
underwent apoptosis compared with A/Sn cells. Unseparated lung cells
and T cells of I/St origin produced more IL-5 and IL-10, respectively,
whereas their A/Sn and F1 counterparts produced more IFN-
following
infection. F1 cells overall expressed an intermediate
phenotype between the two parental strains. Such a more balanced type
of immune reactivity could be linked to a better TB
defense.
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