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2014 ; 192
(12
): 5839-51
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Soluble, but not transmembrane, TNF-? is required during influenza infection to
limit the magnitude of immune responses and the extent of immunopathology
#MMPMID24790150
DeBerge MP
; Ely KH
; Enelow RI
J Immunol
2014[Jun]; 192
(12
): 5839-51
PMID24790150
show ga
TNF-? is a pleotropic cytokine that has both proinflammatory and
anti-inflammatory functions during influenza infection. TNF-? is first expressed
as a transmembrane protein that is proteolytically processed to release a soluble
form. Transmembrane TNF-? (memTNF-?) and soluble TNF-? (solTNF-?) have been shown
to exert distinct tissue-protective or tissue-pathologic effects in several
disease models. However, the relative contributions of memTNF-? or solTNF-? in
regulating pulmonary immunopathology following influenza infection are unclear.
Therefore, we performed intranasal influenza infection in mice exclusively
expressing noncleavable memTNF-? or lacking TNF-? entirely and examined the
outcomes. We found that solTNF-?, but not memTNF-?, was required to limit the
size of the immune response and the extent of injury. In the absence of solTNF-?,
there was a significant increase in the CD8(+) T cell response, including
virus-specific CD8(+) T cells, which was due in part to an increased resistance
to activation-induced cell death. We found that solTNF-? mediates these
immunoregulatory effects primarily through TNFR1, because mice deficient in
TNFR1, but not TNFR2, exhibited dysregulated immune responses and exacerbated
injury similar to that observed in mice lacking solTNF-?. We also found that
solTNF-? expression was required early during infection to regulate the magnitude
of the CD8(+) T cell response, indicating that early inflammatory events are
critical for the regulation of the effector phase. Taken together, these findings
suggest that processing of memTNF-? to release solTNF-? is a critical event
regulating the immune response during influenza infection.