Abstract
IgA nephropathy (IgAN) is the most common primary glomerulonephritis worldwide. This disease, discovered in 1968, is characterized by IgA-IgG glomerular immunodeposits with a mesangial pattern. It is thought that these immunodeposits originate from the immune complexes formed in the circulation. It is hypothesized that the pathogenesis of IgAN is driven by aberrant glycoforms of IgA1 (galactose-deficient IgA1, Gd-IgA1). Gd-IgA1, in genetically susceptible individuals, represents the initiating factor for the formation of circulating immune complexes due to its recognition by IgG autoantibodies and the subsequent formation of pathogenic IgA1-IgG immune complexes. Complement activation through alternative and/or lectin pathways is likely playing an important role in the pathogenic properties of these complexes and may further upregulate local inflammatory responses and glomerular injury.
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Acknowledgements
We are grateful to our colleagues and collaborators who have worked with us on the studies concerning the pathogenesis of IgAN as well as to all volunteers and patients with IgAN who provided biospecimens.
Funding
This study was supported in part by NIH grants DK078244, AI149431, DK082753, and GM098539; by JSPS KAKENHI Grant Number 21K08285; and by a gift from the IGA Nephropathy Foundation of America.
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HS and JN are co-inventors on US patent application 14/318,082 (assigned to UAB Research Foundation). JN is a co-founder and co-owner of and consultant for Reliant Glycosciences, LLC.
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This article is a contribution to the Special issue on: The IgA system, IgA nephropathy and IgA vasculitis - Guest Editors: Jürgen Floege & Jonathan Barratt
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Suzuki, H., Novak, J. IgA glycosylation and immune complex formation in IgAN. Semin Immunopathol 43, 669–678 (2021). https://doi.org/10.1007/s00281-021-00883-8
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DOI: https://doi.org/10.1007/s00281-021-00883-8