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PLoS One. 2016 Jul 20;11(7):e0159426. doi: 10.1371/journal.pone.0159426. eCollection 2016.

Critical Role of Kupffer Cell CD89 Expression in Experimental IgA Nephropathy.

Xu L1, Li B1, Huang M1, Xie K1, Li D2, Li Y1, Gu H1, Fang J1,2,3,4.

Author information

1
School of Life Sciences and Technology, Tongji University, Shanghai, China.
2
Shanghai Tongji Hospital, Tongji University, Shanghai, China.
3
Tongji University Suzhou Institute, Suzhou, Jiangsu, China.
4
Collaborative Innovation Center for Biotherapy, West China Hospital, Sichuan University, Chengdu, Sichuan, China.

Abstract

Although IgA nephropathy (IgAN) is the most common primary glomerulonephritis worldwide, its etiology remains only partly understood. It is clear that the pathogenesis of IgAN involves the formation of macromolecular IgA1 complexes and increased levels of serum IgA1 and IgA1-immune complexes(IC), due to defective IgA1 clearance. Previous studies suggest that the blood and tissue myeloid cell-expressed IgA Fc receptor (FcαR/CD89) mediates IgA-IC clearance and its dysfunction, via decreased activity or excessive levels of soluble FcαR/sCD89 induces IgAN. Such a mechanism requires robust stimulation of IgAN levels via forced expression of CD89. In the absence of unequivocal evidence supporting such a mechanism to date, we attempted to test the extent of CD89-evoked IgAN by generating a transgenic mouse strain expressing human CD89 under the control of murine CD14 promotor. No deposition of IgA-CD89 complexes or glomerulonephritis was detected, however. Further studies showed that elimination of murine IgA was mediated by Kupffer cells. In patients, however, CD89/IgA complexes were detected, and injection of patient IgA induced IgAN-like features in CD89 Tg mice. In transgenic mice, IgAN pathogenesis involves impaired clearance of abnormal IgA via CD89, primarily by the Kupffer cells. Conditional IgAN progression in CD89 transgenic mice thus reveals important aspects of IgAN pathogenesis.

PMID:
27437939
PMCID:
PMC4954728
DOI:
10.1371/journal.pone.0159426
[Indexed for MEDLINE]
Free PMC Article

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