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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 Sci+Rep
2018 ; 8
(1
): 10910
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Characterization of the effects of immunomodulatory drug fingolimod (FTY720) on
human T cell receptor signaling pathways
#MMPMID30026610
Baer A
; Colon-Moran W
; Bhattarai N
Sci Rep
2018[Jul]; 8
(1
): 10910
PMID30026610
show ga
Immune responses against gene therapy products limit its therapeutic efficacy and
present a safety risk. Identification of agents that blunt immune reactions may
aid in developing novel immunomodulatory therapies. Fingolimod (FTY720) is an FDA
approved immunomodulatory drug for treating multiple sclerosis that inhibits
lymphocyte egress from lymphoid tissues by down regulating sphingosine-1
phosphate receptor (S1PR). Recent studies found that FTY720 inhibits T cell
activation (TCA) in a S1PR-independent manner; however, the mechanism is
incompletely understood. Here we characterized the effects of FTY720 on human T
cell receptor (TCR) signaling pathways. FTY720 inhibited both the TCR-dependent
and independent activation of primary human T cells. FTY720 did not affect
proximal TCR signaling events as measured by phosphorylation of Lck, ZAP-70 and
LAT; however, inhibited PMA/Ionomycin induced distal TCR signaling as measured by
IL-2, IFN-? release and CD25 expression. FTY720 induced aberrant NFAT1, AP1 and
NF?B activation which were associated with increased acetylation of histone
(H3K9). Phosphorylated FTY720 did not inhibit TCA, and arachidonic acid did not
rescue FTY720 mediated inhibition of TCA. These data suggest that FTY720 mediated
inhibition of TCA is due to inhibition of distal TCR signaling. Understanding
FTY720-mediated inhibition of TCA may aid in developing novel FTY720-based
immunomodulatory agents.