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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
(10
): 2167-85
Nephropedia Template TP
gab.com Text
Twit Text FOAVip
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English Wikipedia
The soluble pattern recognition receptor PTX3 links humoral innate and adaptive
immune responses by helping marginal zone B cells
#MMPMID27621420
Chorny A
; Casas-Recasens S
; Sintes J
; Shan M
; Polentarutti N
; García-Escudero R
; Walland AC
; Yeiser JR
; Cassis L
; Carrillo J
; Puga I
; Cunha C
; Bastos H
; Rodrigues F
; Lacerda JF
; Morais A
; Dieguez-Gonzalez R
; Heeger PS
; Salvatori G
; Carvalho A
; Garcia-Sastre A
; Blander JM
; Mantovani A
; Garlanda C
; Cerutti A
J Exp Med
2016[Sep]; 213
(10
): 2167-85
PMID27621420
show ga
Pentraxin 3 (PTX3) is a fluid-phase pattern recognition receptor of the humoral
innate immune system with ancestral antibody-like properties but unknown
antibody-inducing function. In this study, we found binding of PTX3 to splenic
marginal zone (MZ) B cells, an innate-like subset of antibody-producing
lymphocytes strategically positioned at the interface between the circulation and
the adaptive immune system. PTX3 was released by a subset of neutrophils that
surrounded the splenic MZ and expressed an immune activation-related gene
signature distinct from that of circulating neutrophils. Binding of PTX3 promoted
homeostatic production of IgM and class-switched IgG antibodies to microbial
capsular polysaccharides, which decreased in PTX3-deficient mice and humans. In
addition, PTX3 increased IgM and IgG production after infection with blood-borne
encapsulated bacteria or immunization with bacterial carbohydrates. This
immunogenic effect stemmed from the activation of MZ B cells through a
neutrophil-regulated pathway that elicited class switching and plasmablast
expansion via a combination of T cell-independent and T cell-dependent signals.
Thus, PTX3 may bridge the humoral arms of the innate and adaptive immune systems
by serving as an endogenous adjuvant for MZ B cells. This property could be
harnessed to develop more effective vaccines against encapsulated pathogens.