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2015 ; 10
(7
): e0131236
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?? T Cells Are Required for M2 Macrophage Polarization and Resolution of
Ozone-Induced Pulmonary Inflammation in Mice
#MMPMID26135595
Mathews JA
; Kasahara DI
; Ribeiro L
; Wurmbrand AP
; Ninin FM
; Shore SA
PLoS One
2015[]; 10
(7
): e0131236
PMID26135595
show ga
We examined the role of ?? T cells in the induction of alternatively activated M2
macrophages and the resolution of inflammation after ozone exposure. Wildtype
(WT) mice and mice deficient in ?? T cells (TCR?-/- mice) were exposed to air or
to ozone (0.3 ppm for up to 72h) and euthanized immediately or 1, 3, or 5 days
after cessation of exposure. In WT mice, M2 macrophages accumulated in the lungs
over the course of ozone exposure. Pulmonary mRNA abundance of the M2 genes,
Arg1, Retnla, and Clec10a, also increased after ozone. In contrast, no evidence
of M2 polarization was observed in TCR?-/- mice. WT but not TCR?-/- mice
expressed the M2c polarizing cytokine, IL-17A, after ozone exposure and WT mice
treated with an IL-17A neutralizing antibody exhibited attenuated ozone-induced
M2 gene expression. In WT mice, ozone-induced increases in bronchoalveolar lavage
neutrophils and macrophages resolved quickly after cessation of ozone exposure
returning to air exposed levels within 3 days. However, lack of M2 macrophages in
TCR?-/- mice was associated with delayed clearance of inflammatory cells after
cessation of ozone and increased accumulation of apoptotic macrophages in the
lungs. Delayed restoration of normal lung architecture was also observed in
TCR?-/- mice. In summary, our data indicate that ?? T cells are required for the
resolution of ozone-induced inflammation, likely because ?? T cells, through
their secretion of IL-17A, contribute to changes in macrophage polarization that
promote clearance of apoptotic cells.