alexa B cell maintenance of subcapsular sinus macrophages protects against a fatal viral infection independent of adaptive immunity.
Immunology

Immunology

Journal of Clinical & Cellular Immunology

Author(s): Moseman EA, Iannacone M, Bosurgi L, Tonti E, Chevrier N,

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Abstract Neutralizing antibodies have been thought to be required for protection against acutely cytopathic viruses, such as the neurotropic vesicular stomatitis virus (VSV). Utilizing mice that possess B cells but lack antibodies, we show here that survival upon subcutaneous (s.c.) VSV challenge was independent of neutralizing antibody production or cell-mediated adaptive immunity. However, B cells were absolutely required to provide lymphotoxin (LT) α1β2, which maintained a protective subcapsular sinus (SCS) macrophage phenotype within virus draining lymph nodes (LNs). Macrophages within the SCS of B cell-deficient LNs, or of mice that lack LTα1β2 selectively in B cells, displayed an aberrant phenotype, failed to replicate VSV, and therefore did not produce type I interferons, which were required to prevent fatal VSV invasion of intranodal nerves. Thus, although B cells are essential for survival during VSV infection, their contribution involves the provision of innate differentiation and maintenance signals to macrophages, rather than adaptive immune mechanisms. Copyright © 2012 Elsevier Inc. All rights reserved.
This article was published in Immunity and referenced in Journal of Clinical & Cellular Immunology

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