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Laboratory of Mycobacteria, Division of Bacterial Products, Center for Biologics, Evaluation, and Research, Food and Drug Administration, Rockville, MD 20852; and
Veterinary Resource Branch, Comparative Pathology Section, National Institutes of Health, Rockville, MD 20852
Long-term survival of mice infected with Mycobacterium
tuberculosis is dependent upon IFN-
and T cells, but events in
early phases of the immune response are not well understood. In this
study, we describe a role for B cells during early immune responses to
infection with a clinical isolate of M. tuberculosis (CDC
1551). Following a low-dose infection with M. tuberculosis
CDC 1551, similar numbers of bacteria were detected in the lungs of
both B cell knockout (IgH 6-, BKO) and C57BL/6J
(wild-type) mice. However, despite comparable bacterial loads in the
lungs, less severe pulmonary granuloma formation and delayed
dissemination of bacteria from lungs to peripheral organs were observed
in BKO mice. BKO mice reconstituted with naive B cells, but not those
given M. tuberculosis-specific Abs, before infection
developed pulmonary granulomas and dissemination patterns similar to
wild-type animals. Further analysis of lung cell populations revealed
greater numbers of lymphocytes, especially CD8+ T cells,
macrophages, and neutrophils in wild-type and reconstituted mice than
in BKO mice. Thus, less severe lesion formation and delayed
dissemination of bacteria found in BKO mice were dependent on B cells,
not Abs, and were associated with altered cellular infiltrate to the
lungs. These observations demonstrate an important, previously
unappreciated, role for B cells during early immune responses to
M. tuberculosis infections.
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