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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+Immunol
2014 ; 193
(1
): 379-90
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Signal transduction by different forms of the ?? T cell-specific pattern
recognition receptor WC1
#MMPMID24850725
Chen C
; Hsu H
; Hudgens E
; Telfer JC
; Baldwin CL
J Immunol
2014[Jul]; 193
(1
): 379-90
PMID24850725
show ga
WC1 coreceptors are scavenger receptor cysteine-rich (SRCR) family members,
related to T19 in sheep, SCART in mice, and CD163c-? in humans, and form a
13-member subfamily in cattle exclusively expressed on ?? T cells. Subpopulations
of ?? T cells are defined by anti-WC1 mAbs and respond to different pathogen
species accordingly. In this study, variegated WC1 gene expression within
subpopulations and differences in signaling and cell activation due to endodomain
sequences are described. The endodomains designated types I to III differ by a
15- or 18-aa insert in type II and an additional 80 aa containing an additional
eight tyrosines for type III. Anti-WC1 mAbs enhanced cell proliferation of ?? T
cells when cross-linked with the TCR regardless of the endodomain sequences.
Chimeric molecules of human CD4 ectodomain with WC1 endodomains transfected into
Jurkat cells showed that the tyrosine phosphorylation of the type II was the same
as that of the previously reported archetypal sequence (type I) with only Y24EEL
phosphorylated, whereas for type III only Y199DDV and Y56TGD were phosphorylated
despite conservation of the Y24EEL/Y24QEI and Y199DDV/I tyrosine motifs among the
three types. Time to maximal phosphorylation was more rapid with type III
endodomains and sustained longer. Differences in tyrosine phosphorylation were
associated with differences in function in that cross-linking of type III
chimeras with TCR resulted in significantly greater IL-2 production.
Identification of differences in the signal transduction through the endodomains
of WC1 contributes to understanding the functional role of the WC1 coreceptors in
the ?? T cell responses.