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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 PLoS+One
2017 ; 12
(11
): e0188045
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gab.com Text
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Soluble CD40 ligand directly alters glomerular permeability and may act as a
circulating permeability factor in FSGS
#MMPMID29155846
Doublier S
; Zennaro C
; Musante L
; Spatola T
; Candiano G
; Bruschi M
; Besso L
; Cedrino M
; Carraro M
; Ghiggeri GM
; Camussi G
; Lupia E
PLoS One
2017[]; 12
(11
): e0188045
PMID29155846
show ga
CD40/CD40 ligand (CD40L) dyad, a co-stimulatory bi-molecular complex involved in
the adaptive immune response, has also potent pro-inflammatory actions in
haematopoietic and non-haematopoietic cells. We describe here a novel role for
soluble CD40L (sCD40L) as modifier of glomerular permselectivity directly acting
on glomerular epithelial cells (GECs). We found that stimulation of CD40,
constitutively expressed on GEC cell membrane, by the sCD40L rapidly induced
redistribution and loss of nephrin in GECs, and increased albumin permeability in
isolated rat glomeruli. Pre-treatment with inhibitors of CD40-CD40L interaction
completely prevented these effects. Furthermore, in vivo injection of sCD40L
induced a significant reduction of nephrin and podocin expression in mouse
glomeruli, although no significant increase of urine protein/creatinine ratio was
observed after in vivo injection. The same effects were induced by plasma factors
partially purified from post-transplant plasma exchange eluates of patients with
focal segmental glomerulosclerosis (FSGS), and were blocked by CD40-CD40L
inhibitors. Moreover, 17 and 34 kDa sCD40L isoforms were detected in the same
plasmapheresis eluates by Western blotting. Finally, the levels of sCD40Lwere
significantly increased in serum of children both with steroid-sensitive and
steroid-resistant nephrotic syndrome (NS), and in adult patients with
biopsy-proven FSGS, compared to healthy subjects, but neither in children with
congenital NS nor in patients with membranous nephropathy. Our results
demonstrate that sCD40L directly modifies nephrin and podocin distribution in
GECs. Moreover, they suggest that sCD40L contained in plasmapheresis eluates from
FSGS patients with post-transplant recurrence may contribute, presumably
cooperating with other mediators, to FSGS pathogenesis by modulating glomerular
permeability.