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Oncotarget. 2017 Dec 14;9(3):3292-3302. doi: 10.18632/oncotarget.23232. eCollection 2018 Jan 9.

BAFF and APRIL expression as an autoimmune signature of membranous nephropathy.

Han SS1,2, Yang SH2, Jo HA1, Oh YJ2, Park M2, Kim JY2, Lee H1,2, Lee JP1,2,3, Lee SH4, Joo KW1,2, Lim CS1,3, Kim YS1,2, Kim DK1,2.

Author information

1
Department of Internal Medicine, Seoul National University College of Medicine, Seoul, Korea.
2
Kidney Research Institute, Seoul National University, Seoul, Korea.
3
Department of Internal Medicine, Seoul National University Boramae Medical Center, Seoul, Korea.
4
Department of Internal Medicine, College of medicine, Kyung Hee University, Seoul, Korea.

Abstract

Background:

Based on the fact that B-cell activating factor (BAFF) and a proliferation-inducing ligand (APRIL) have a regulatory role in B cell biology, excessive levels of these cytokines can promote autoimmune pathogenesis. However, the expression and implication remain unresolved in cases of membranous nephropathy (MN).

Results:

The plasma BAFF levels of the primary MN patients were higher than those of healthy controls but lower than those of secondary MN patients, whereas the APRIL levels were similar between the MN patients and healthy controls. The BAFF levels were higher in relapse cases, whereas the APRIL levels were higher in the patients who did not experience remission compared with the counterpart patients. The ectopic expression of BAFF and APRIL was observed in the glomeruli or circulating B cells of MN patients, and this high expression trend was similar to that of lupus patients.

Conclusions:

Expression profile of BAFF and APRIL in MN is similar to that of other autoimmune disease, which affects the kidney outcomes.

Methods:

Plasma BAFF and APRIL levels were measured upon kidney biopsy in patients with primary (n = 89) and secondary MN (n = 13), and the results were compared with the levels in healthy controls (n = 111). The kidney outcomes (e.g., remission and relapse) were traced for the median of 3 years. Aberrant expression of the cytokines was evaluated in the kidney and circulating B cells using immunohistochemistry and flow cytometry analyses, respectively.

KEYWORDS:

APRIL; B cells; BAFF; autoimmunity; membranous nephropathy

Conflict of interest statement

CONFLICTS OF INTEREST The authors have no conflict of interest to declare in relation to this article.

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