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Clin Chim Acta. 2011 Apr 11;412(9-10):718-24. doi: 10.1016/j.cca.2010.12.029. Epub 2010 Dec 31.

Autoantibodies to GP2, the major zymogen granule membrane glycoprotein, are new markers in Crohn's disease.

Author information

1
GA Generic Assays GmbH, 15827 Dahlewitz, Ludwig-Erhard Ring 3, Germany. dirk.roggenbuck@genericassays.com

Abstract

BACKGROUND:

Crohn's disease (CD) is an inflammatory bowel disease (IBD) characterized by reactivity against microbial and self antigens. Zymogen granule glycoprotein 2 (GP2) was identified as the major autoantigen of CD-specific pancreatic autoantibodies (PAB).

METHODS:

Human GP2 was expressed in the Spodoptera frugiperda 9 (Sf9) cell line using the baculovirus system, purified by Ni-chelate chromatography, and used as antigen for anti-GP2 IgA and IgG assessment by enzyme-linked immunosorbent assays (ELISA). Antibodies to mannan of Saccharomyces cerevisiae (ASCA), PAB, and anti-GP2 were investigated in sera of 178 CD patients, 100 ulcerative colitis (UC) patients, and 162 blood donors (BD).

RESULTS:

Anti-GP2 IgG and IgA were found in 48/72 (66.7%) and 23/72 (31.9%) PAB positive and 5/106 (4.7%) and 1/106 (0.9%) PAB negative CD patients (p<0.0001), respectively. CD patients displayed significantly higher reactivity to GP2 than UC patients and BD (p<0.0001), respectively. Occurrence of anti-GP2 antibodies correlated with PAB reactivity (Spearmen's rho=0.493, p<0.00001). There was a significant relationship between the occurrence of ASCA IgG and anti-GP2 IgG (p=0.0307).

CONCLUSIONS:

Anti-GP2 IgG and IgA constitute novel CD specific autoantibodies, the quantification of which could improve the serological diagnosis of IBD.

PMID:
21195704
DOI:
10.1016/j.cca.2010.12.029
[Indexed for MEDLINE]

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