Macrophage and epithelial cell H-ferritin expression regulates renal inflammation

Academic Article

Abstract

  • © 2015 International Society of Nephrology. Inflammation culminating in fibrosis contributes to progressive kidney disease. Cross-talk between the tubular epithelium and interstitial cells regulates inflammation by a coordinated release of cytokines and chemokines. Here we studied the role of heme oxygenase-1 (HO-1) and the heavy subunit of ferritin (FtH) in macrophage polarization and renal inflammation. Deficiency in HO-1 was associated with increased FtH expression, accumulation of macrophages with a dysregulated polarization profile, and increased fibrosis following unilateral ureteral obstruction in mice: a model of renal inflammation and fibrosis. Macrophage polarization in vitro was predominantly dependent on FtH expression in isolated bone marrow-derived mouse monocytes. Using transgenic mice with conditional deletion of FtH in the proximal tubules (FtH PT-/-) or myeloid cells (FtH LysM-/-), we found that myeloid FtH deficiency did not affect polarization or accumulation of macrophages in the injured kidney compared with wild-type (FtH +/+) controls. However, tubular FtH deletion led to a marked increase in proinflammatory macrophages. Furthermore, injured kidneys from FtH PT-/- mice expressed significantly higher levels of inflammatory chemokines and fibrosis compared with kidneys from FtH +/+ and FtH LysM-/- mice. Thus, there are differential effects of FtH in macrophages and epithelial cells, which underscore the critical role of FtH in tubular-macrophage cross-talk during kidney injury.
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    Digital Object Identifier (doi)

    Author List

  • Bolisetty S; Zarjou A; Hull TD; Traylor AM; Perianayagam A; Joseph R; Kamal AI; Arosio P; Soares MP; Jeney V
  • Start Page

  • 95
  • End Page

  • 108
  • Volume

  • 88
  • Issue

  • 1