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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+Res
2017 ; 2017
(ä): 8679841
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Analysis of Sera of Recipients with Allograft Rejection Indicates That Keratin 1
Is the Target of Anti-Endothelial Antibodies
#MMPMID28265584
Guo X
; Hu J
; Luo W
; Luo Q
; Guo J
; Tian F
; Ming Y
; Zou Y
J Immunol Res
2017[]; 2017
(ä): 8679841
PMID28265584
show ga
Anti-endothelial cell antibodies (AECAs) are usually directed against the surface
antigens on the vascular endothelial cells. Clinical studies suggest a pathogenic
role for nonhuman leukocyte antigen in antibody-mediated rejection; however, the
antigens on the donor vascular endothelium that serve as the first-line targets
for an immune response during allograft rejection have not been fully identified.
Here, we used immunoprecipitation and mass spectrometry to identify antigens from
the sera of kidney transplant recipients who were experiencing antibody-mediated
rejection. Keratin 1 (KRT1) was identified as a novel antigenic target expressed
on endothelial cells. To validate our finding, we produced recombinant proteins
representing the three most common alleles of KRT1. The serum used for
immunoprecipitation showed a strong reaction to KRT1 recombinants in western blot
and ELISA. In the kidney transplant cohort, more AECA-positive recipients than
AECA-negative recipients had KRT1 antibodies (32.2% versus 11.9%, p = 0.002).
Sera from 255 renal recipients were tested by ELISA. Of the 77 recipients with
deteriorating graft function (serum creatinine > 120??mol/L), 23 had anti-KRT1
antibodies. KRT1-IgG positivity was, therefore, associated with a higher risk of
kidney transplant rejection (29.9% (23/77) versus 16.9% (30/178), p = 0.0187). A
better understanding of this antigenic target will improve long-term allograft
survival.