2Lomonosov Moscow State University, Biology Faculty, 119991 Moscow, Russia
3Engelhardt Institute of Molecular Biology, Russian Academy of Sciences, ul. Vavilova 32, 119991 Moscow, Russia; fax: +7 (499) 135-1405; E-mail: email@example.com
* To whom correspondence should be addressed.
Received May 14, 2014; Revision received June 9, 2014
Tumor necrosis factor (TNF) plays a pivotal role in the early control of Mycobacterium tuberculosis and M. avium infections by a host. It was previously shown that both phagocyte-derived and T-cell-derived TNF productions are critical for protective immunity against M. tuberculosis, but the role of TNF produced by B-cells remained unclear. By comparing mice with B-cell-specific TNF deletion to littermate control mice, here we show that TNF production by B-lymphocytes is essential for the formation of infection-specific aggregates of B-cells in the lung. It is likely that these compact foci represent a pathogenic feature of inflammatory response rather than an element of protective immunity, since the capacity to form aggregates has no influence on the severity of M. tuberculosis- and M. avium-triggered diseases.
KEY WORDS: mycobacterial infections, B-lymphocytes, TNF, lung pathology, mouse models