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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 J+Leukoc+Biol
2014 ; 96
(3
): 427-36
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The TLR signaling adaptor TRAM interacts with TRAF6 to mediate activation of the
inflammatory response by TLR4
#MMPMID24812060
Verstak B
; Stack J
; Ve T
; Mangan M
; Hjerrild K
; Jeon J
; Stahl R
; Latz E
; Gay N
; Kobe B
; Bowie AG
; Mansell A
J Leukoc Biol
2014[Sep]; 96
(3
): 427-36
PMID24812060
show ga
TLRs act as sentinels in professional immune cells to detect and initiate the
innate immune response to pathogen challenge. TLR4 is a widely expressed TLR,
responsible for initiating potent immune responses to LPS. TRAM acts to bridge
TLR4 with TRIF, orchestrating the inflammatory response to pathogen challenge. We
have identified a putative TRAF6-binding motif in TRAM that could mediate a novel
signaling function for TRAM in TLR4 signaling. TRAM and TRAF6 association was
confirmed by immunoprecipitation of endogenous, ectopically expressed and
recombinant proteins, which was ablated upon mutation of a key Glu residue in
TRAM (TRAM E183A). TRAF6 and TRAM were observed colocalizing using confocal
microscopy following ectopic expression in cells and the ability of TRAM and TRAM
E183A to activate luciferase-linked reporter assays was determined in HEK293 and
TRAF6-deficient cells. Importantly, TRAM-deficient macrophages reconstituted with
TRAM E183A display significantly reduced inflammatory TNF-?, IL-6, and RANTES
protein production compared with WT TRAM. These results demonstrate a novel role
for TRAM in TLR4-mediated signaling in regulating inflammatory responses via its
interaction with TRAF6, distinct from its role as a bridging adaptor between TLR4
and TRIF.
|Adaptor Proteins, Signal Transducing/chemistry/genetics/*physiology
[MESH]