Assessing serum IgG4 glycosylation profiles of IgG4-related disease using lectin microarray.

Abstract

OBJECTIVES:

IgG4 related disease (IgG4-RD) is a multiorgan fibroinflammatory disorder. Lectin microarray is a high-throughput glycosylation analysis technology. The aim of our study was to investigate glycosylation profiling of serum IgG4 from IgG4-RD patients and controls.

METHODS:

A large cohort of 167 IgG4-RD patients, 130 disease controls (DCs) and 86 healthy controls (HCs) were included in the current study. The glycan level of serum IgG4 of all participants was determined by lectin microarray. A verification assay of lectin microarray and lectin blot were used to clarify the relationship between the serum IgG4 and purified IgG4 glycosylation.

RESULTS:

The results revealed that the glycan level of mannose (binding MNA-M, VVA mannose, ConA) was significantly increased and that the glycan level of fucose (binding LTL), GlcNAc (binding DSL), GalNAc (binding HPA) was significantly decreased in IgG4-RD patients compared to DCs and HCs. We further found that the glycan level of GlcNAc was positively correlated with that of complement 3 (C3), and that the reduced level of GlcNAc was associated with damage to multiple organs. In addition, the mannose level (binding MNA-M and VVA mannose) was negatively correlated with C3 and complement 4 (C4) levels.

CONCLUSIONS:

Serum IgG4 of IgG4-RD patients exhibits different glycosylation levels. This study demonstrated that there is important clinical value in identifying aberrant GlcNAc levels as a potential diagnostic index for multi-organ involvement. Furthermore, the mannose level of serum IgG4 may reflect the degree of inflammation of IgG4-RD.

• Authors: Chaojun Hu, Panpan Zhang, Liubing Li, Chenxi Liu, Jieqiong Li, Wen Zhang, Yongzhe Li
• Journal: Clinical and experimental rheumatology (Clin Exp Rheumatol) 2021 Mar-Apr Vol. 39 Issue 2 Pg. 393-402 ISSN: 0392-856X [Print] Italy
• PMID: 32662414 (Publication Type: Journal Article)

Chemical References

• Complement C4
• Immunoglobulin G
• Lectins

Topics

• Complement C4
• Glycosylation
• Humans
• Immunoglobulin G (metabolism)
• Immunoglobulin G4-Related Disease
• Lectins