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CD16+CD56+ cells are a potential culprit for hematuria in IgA nephropathy.

Abstract：

BACKGROUND:Hematuria is the first manifestation of urinary abnormality in immunoglobulin A nephropathy (IgAN). Hematuria has recently been reported as a risk factor for deterioration of renal function; however, its cause remains unknown. METHODS:We analyzed the surface marker of peripheral blood mononuclear cells before and immediately after tonsillectomy in IgAN patients and controls (chronic tonsillitis or tonsillar hypertrophy) by flow cytometry and investigated the association with hematuria. To prove our hypothesis that NK cells induce hematuria, we administered IL-12, activator of NK cells, to HIGA mice. In addition, we transferred cultured NK cells to nude rats and transferred the CD16(+)CD56(+) cells, including NK cells, that are derived from the peripheral blood of IgAN patients immediately after tonsillectomy to nude rats to assess the hematuria level and renal histology of the recipients. We also performed cytotoxicity assays against glomerular endothelial cells by NK cells. RESULTS:We found that IgAN patients who showed rapid deterioration of hematuria after tonsillectomy also displayed a significant increase in CD16(+)CD56(+) cells in the peripheral blood immediately after tonsillectomy. Exogenous administration of IL-12 to HIGA mice induced hematuria. Adoptive transfer of either cells of an NK cell line, or of CD16(+)CD56(+) cells derived from IgAN patients, into nude rats induced hematuria in the recipients. In vitro analysis showed that NK cells exert cytotoxic activity toward human glomerular endothelial cells in a dose-dependent manner. CONCLUSIONS:CD16(+)CD56(+) cells seem to be responsible for hematuria in IgAN.

journal_name

Clin Exp Nephrol

journal_title

Clinical and experimental nephrology

authors

Iwatani H,Nagasawa Y,Yamamoto R,Iio K,Mizui M,Horii A,Kitahara T,Inohara H,Kumanogoh A,Imai E,Rakugi H,Isaka Y

doi

10.1007/s10157-014-0968-z

subject

Has Abstract

pub_date

2015-04-01 00:00:00

pages

216-24

issue

2

eissn

1342-1751

issn

1437-7799

journal_volume

19

pub_type

杂志文章

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