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Renal recruitment of B lymphocytes exacerbates tubulointerstitial fibrosis by promoting monocyte mobilization and infiltration after unilateral ureteral obstruction.
Journal of Pathology 2017 January
Renal fibrosis is a significant threat to public health globally. Diverse primary aetiologies eventually result in chronic kidney disease (CKD) and immune cells influence this process. The roles of monocytes/macrophages, T cells, and mast cells have been carefully examined, whilst only a few studies have focused on the effect of B cells. We investigated B-cell function in tubulointerstitial fibrosis induced by unilateral ureteral obstruction (UUO), using genetic B-cell-deficient μMT mice or CD20 antibody-mediated B-cell-depleted mice. Obstructed kidneys of μMT and anti-CD20-treated mice showed lower levels of monocyte/macrophage infiltration and collagen deposition compared to wild-type mice. Mechanistically, anti-CD20 attenuated UUO-induced alterations of renal tumour necrosis factor-α (TNF-α), vascular cell adhesion molecule 1 (VCAM-1) pro-inflammatory genes, and CC chemokine ligand-2 (CCL2) essential for monocyte recruitment; B cells were one of the main sources of CCL2 in post-UUO kidneys. Neutralization of CCL2 reduced monocyte/macrophage influx and fibrotic changes in obstructed kidneys. Therefore, early-stage accumulation of B cells in the kidney accelerated monocyte/macrophage mobilization and infiltration, aggravating the fibrosis resulting from acutely induced kidney nephropathy. © 2016 The Authors. Journal of Pathology published by John Wiley & Sons Ltd on behalf of Pathological Society of Great Britain and Ireland.
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