B Lymphocytes provide an infection niche for intracellular bacterium Brucella abortus.

The Journal of Infectious Diseases
Radhika GoenkaCynthia L Baldwin

Abstract

Brucella spp. are intracellular bacteria that establish lifelong infections whose mechanisms of chronicity are poorly understood. Notably, B cells facilitate the establishment of the high infection plateau that persists for months. We evaluated the contribution of murine B cells toward providing infection niches for Brucella by using flow cytometry and microscopy and by determining live bacterial counts associated with B cells both in vivo and in vitro. Herein we demonstrate that immunoglobulin M and complement-opsonized Brucella abortus infects and survives inside primary murine B cells protected from bactericidal effects of gentamicin. The entry was dependent on microfilaments for internalization and subsequently brucellae reside in a late endosomal/lysosomal compartment. Throughout the infection, 10% of colony-forming units from infected mice was associated with B cells, and these cells transferred disease to naive hosts. Furthermore, Brucella-positive cells were positive for transforming growth factor (TGF) β1, and about 10% of such cells were B cells, similar to rates found for other intracellular pathogens that induce their hosts cells to produce TGF-β1. To conclude, infected B cells contribute to chronic bacterial infect...Continue Reading

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Citations

May 28, 2014·The Journal of Experimental Medicine·Katharina NothelferArmelle Phalipon
Jan 27, 2016·Acta Veterinaria Scandinavica·Anett Kristin LarsenIngebjørg Helena Nymo
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Oct 16, 2020·Microbiology and Molecular Biology Reviews : MMBR·Edgardo Moreno, Elías Barquero-Calvo

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