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2013 ; 11
(4
): 196-202
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Inducible bronchus-associated lymphoid tissue (iBALT) synergizes with local lymph
nodes during antiviral CD4+ T cell responses
#MMPMID24364842
Richert LE
; Harmsen AL
; Rynda-Apple A
; Wiley JA
; Servid AE
; Douglas T
; Harmsen AG
Lymphat Res Biol
2013[Dec]; 11
(4
): 196-202
PMID24364842
show ga
BACKGROUND: Exposure of the lungs to an antigen or pathogen elicits the formation
of lymphoid satellite islands termed inducible bronchus-associated lymphoid
tissue (iBALT). However, little is known about how the presence of iBALT, induced
by a stimulus unrelated to the subsequent challenge agent, influences systemic
immunity in distal locations, whether it be independently, antagonistically, or
synergistically. Here, we determined the kinetics of the influenza-specific
responses in the iBALT, tracheobronchial lymph node (TBLN), and spleen of mice
with and without pre-formed iBALT. METHODS AND RESULTS: Mice with VLP-induced
iBALT or no pre-formed iBALT were challenged with influenza. We found that, as we
have previously described, those mice whose lungs contained pre-formed iBALT were
protected from morbidity, and furthermore, that these mice had increased
dendritic cell, and alveolar macrophage accumulation in both the iBALT and TBLNs.
This translated to similarly accelerated kinetics and intensified
influenza-specific CD4(+), but not CD8(+) T cell responses in the iBALT, TBLN,
and spleen. This expansion was then followed by a more rapid T cell contraction
in all lymphoid tissues in the mice with pre-formed iBALT. CONCLUSIONS: Thus,
iBALT itself may not be responsible for the accelerated primary immune response
we observe in mice with pre-formed iBALT, but may contribute to an overall
accelerated local and systemic primary CD4(+), but not CD8(+) T cell response.
Furthermore, less damaging immune responses observed in mice with pre-formed
iBALT may be due to a quicker contraction of CD4(+) T cell responses in both
local and systemic secondary lymphoid tissue.