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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+Am+Soc+Nephrol
2017 ; 28
(4
): 1227-1238
Nephropedia Template TP
gab.com Text
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Twit Text #
English Wikipedia
Toll-Like Receptor 9 Stimulation Induces Aberrant Expression of a
Proliferation-Inducing Ligand by Tonsillar Germinal Center B Cells in IgA
Nephropathy
#MMPMID27920152
Muto M
; Manfroi B
; Suzuki H
; Joh K
; Nagai M
; Wakai S
; Righini C
; Maiguma M
; Izui S
; Tomino Y
; Huard B
; Suzuki Y
J Am Soc Nephrol
2017[Apr]; 28
(4
): 1227-1238
PMID27920152
show ga
The TNF family member a proliferation-inducing ligand (APRIL; also known as
TNFSF13), produced by myeloid cells, participates in the generation and survival
of antibody-producing plasma cells. We studied the potential role of APRIL in the
pathogenesis of IgA nephropathy (IgAN). We found that a significant proportion of
germinal centers (GCs) in tonsils of patients with IgAN contained cells
aberrantly producing APRIL, contributing to an overall upregulation of tonsillar
APRIL expression compared with that in tonsils of control patients with
tonsillitis. In IgAN GC, antigen-experienced IgD(-)CD38(+/-)CD19(+) B cells
expressing a switched IgG/IgA B cell receptor produced APRIL. Notably, these GC B
cells expressed mRNA encoding the common cleavable APRIL-? but also, the less
frequent APRIL-?/? mRNA, which encodes a protein that lacks a furin cleavage site
and is, thus, the uncleavable membrane-bound form. Significant correlation
between TLR9 and APRIL expression levels existed in tonsils from patients with
IgAN. In vitro, repeated TLR9 stimulation induced APRIL expression in tonsillar B
cells from control patients with tonsillitis. Clinically, aberrant APRIL
expression in tonsillar GC correlated with greater proteinuria, and patients with
IgAN and aberrant APRIL overexpression in tonsillar GC responded well to
tonsillectomy, with parallel decreases in serum levels of galactose-deficient
IgA1. Taken together, our data indicate that antibody disorders in IgAN associate
with TLR9-induced aberrant expression of APRIL in tonsillar GC B cells.