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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+Exp+Med
2016 ; 213
(12
): 2691-2706
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CD72 negatively regulates B lymphocyte responses to the lupus-related endogenous
toll-like receptor 7 ligand Sm/RNP
#MMPMID27810925
Akatsu C
; Shinagawa K
; Numoto N
; Liu Z
; Ucar AK
; Aslam M
; Phoon S
; Adachi T
; Furukawa K
; Ito N
; Tsubata T
J Exp Med
2016[Nov]; 213
(12
): 2691-2706
PMID27810925
show ga
Toll-like receptor 7 (TLR7) plays an essential role in development of systemic
lupus erythematosus by co-stimulating B cells reactive to the endogenous TLR7
ligand Sm/ribonucleoprotein (RNP), a crucial lupus self-antigen. However, how the
TLR7-mediated autoimmune response is regulated is not yet known. In this study,
we demonstrate that CD72, an inhibitory B cell co-receptor known to prevent
development of lupus, recognizes Sm/RNP at the extracellular C-type lectin-like
domain (CTLD) and specifically inhibits B cell response to Sm/RNP. Moreover, the
CTLD of CD72(c), a lupus-susceptible allele, binds to Sm/RNP less strongly than
that of lupus-resistant CD72(a) Reduced binding of CD72(c) is supported by x-ray
crystallographic analysis that reveals a considerable alteration in charge at the
putative ligand-binding site. Thus, CD72 appears to specifically inhibit B cell
response to the endogenous TLR7 ligand Sm/RNP through CTLD-mediated recognition
of Sm/RNP, thereby preventing production of anti-Sm/RNP antibody crucial for
development of lupus.