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2017 ; 7
(1
): 14940
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Palmitate inhibits arthritis by inducing t-bet and gata-3 mRNA degradation in
iNKT cells via IRE1?-dependent decay
#MMPMID29097726
Ko JS
; Koh JM
; So JS
; Jeon YK
; Kim HY
; Chung DH
Sci Rep
2017[Nov]; 7
(1
): 14940
PMID29097726
show ga
Long chain fatty acids (LCFAs) exert pro-inflammatory effects in vivo. However,
little is known regarding the effect of LCFAs on invariant (i) NKT cell
functions. Here, we report an inhibitory effect of saturated LCFAs on
transcription factors in iNKT cells. Among the saturated LCFAs, palmitic acid
(PA) specifically inhibited IL-4 and IFN-? production and reduced gata-3 and
t-bet transcript levels in iNKT cells during TCR-mediated activation. In iNKT
cells, PA was localized and induced dilation in the endoplasmic reticulum and
increased the mRNA levels of downstream molecules of IRE1? RNase. Moreover, PA
increased the degradation rates of gata-3 and t-bet mRNA, which was restored by
IRE1? inhibition or transfection with mutant gata-3 or t-bet, indicating that
gata-3 and t-bet are cleaved via regulated IRE1?-dependent decay (RIDD). A
PA-rich diet and PA injection suppressed IL-4 and IFN-? production by iNKT cells
in C57BL/6, but not J?18 knockout mice, which was restored by injection of
STF083010, an IRE1?-specific inhibitor. Furthermore, a PA-rich diet and PA
injection attenuated arthritis in an iNKT cell-dependent manner. Taken together,
our experiments demonstrate that a saturated LCFA induced RIDD-mediated t-bet and
gata-3 mRNA degradation in iNKT cells, thereby suppressing arthritis.