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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Clin+Exp+Immunol
2016 ; 185
(3
): 348-60
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The regulatory role of interferon-? producing gamma delta T cells via the
suppression of T helper 17 cell activity in bleomycin-induced pulmonary fibrosis
#MMPMID27083148
Segawa S
; Goto D
; Iizuka A
; Kaneko S
; Yokosawa M
; Kondo Y
; Matsumoto I
; Sumida T
Clin Exp Immunol
2016[Sep]; 185
(3
): 348-60
PMID27083148
show ga
Interstitial pneumonia (IP) is a chronic progressive interstitial lung disease
associated with poor prognosis and high mortality. However, the pathogenesis of
IP remains to be elucidated. The aim of this study was to clarify the role of
pulmonary ??T cells in IP. In wild-type (WT) mice exposed to bleomycin, pulmonary
??T cells were expanded and produced large amounts of interferon (IFN)-? and
interleukin (IL)-17A. Histological and biochemical analyses showed that
bleomycin-induced IP was more severe in T cell receptor (TCR-?-deficient
(TCR?(-/-) ) mice than WT mice. In TCR?(-/-) mice, pulmonary IL-17A(+) CD4(+) ?
cells expanded at days 7 and 14 after bleomycin exposure. In TCR?(-/-) mice
infused with ??T cells from WT mice, the number of pulmonary IL-17A(+) CD4(+) T
cells was lower than in TCR?(-/-) mice. The examination of IL-17A(-/-) TCR?(-/-)
mice indicated that ??T cells suppressed pulmonary fibrosis through the
suppression of IL-17A(+) CD4(+) T cells. The differentiation of T helper (Th)17
cells was determined in vitro, and CD4(+) cells isolated from TCR?(-/-) mice
showed normal differentiation of Th17 cells compared with WT mice. Th17 cell
differentiation was suppressed in the presence of IFN-? producing ??T cells in
vitro. Pulmonary fibrosis was attenuated by IFN-?-producing ??T cells through the
suppression of pulmonary IL-17A(+) CD4(+) T cells. These results suggested that
pulmonary ??T cells seem to play a regulatory role in the development of
bleomycin-induced IP mouse model via the suppression of IL-17A production.