Pediatric Nephrology

, Volume 25, Issue 7, pp 1291–1298 | Cite as

Characterisation of renal immune cell infiltrates in children with nephrotic syndrome

  • Kerstin Benz
  • Maike Büttner
  • Katalin Dittrich
  • Valentina Campean
  • Jörg Dötsch
  • Kerstin Amann
Original Article

Abstract

There is increasing evidence that not only T cells but also B cells may play an important role in the pathogenesis of idiopathic nephrotic syndrome (NS). We have evaluated the infiltrating immune cells found in renal biopsies from 38 children with NS using immunohistochemistry techniques involving antibodies against T cells (CD3, CD4, CD8, FoxP3), B cells (CD20), macrophages (CD68) and follicular dendritic cells (CD21). Kidney biopsies with thin basement membrane disease were used as controls. We found higher numbers of interstitial CD3-positive T cells and macrophages in patients with focal segmental glomerulosclerosis (FSGS) than in those with minimal change glomerulopathy (MCGN) and in the controls, and significantly lower FoxP3-positive cells in patients with FSGS, MCGN and steroid-dependent NS than in the controls. Significantly higher numbers of glomerular B cells were found in FSGN patients than in MCGN patients and controls. Of note, in three patients who were later successfully treated with anti-CD20 antibody rituximab, the number of renal B cells was negligible in the preceding biopsy. In conclusion, the higher numbers of interstitial CD3-positive T cells in renal biopsies of pediatric patients with FSGS argue for a higher inflammatory activity. The significantly higher number of glomerular B cells in FSGS patients may indicate a particular pathogenetic role or epiphenomenon in this disease. However, patients with no interstitial or glomerular B cells could also benefit from rituximab treatment.

Keywords

B-lymphocyte Idiopathic nephrotic syndrome Macrophage Renal infiltration T-lymphocyte 

Notes

Acknowledgements

The study was supported by the IZKF (Interdisziplinäres Zentrum für Klinische Forschung) Erlangen to K. B. and by the Deutsche Forschungsgemeinschaft (SFB 423, Z2, B13). The authors especially thank Miriam Reutelshöfer, Claudia Störer and Christa Winkelmann for expert technical assistance.

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Copyright information

© IPNA 2010

Authors and Affiliations

  • Kerstin Benz
    • 1
    • 2
  • Maike Büttner
    • 2
  • Katalin Dittrich
    • 1
  • Valentina Campean
    • 2
  • Jörg Dötsch
    • 1
  • Kerstin Amann
    • 2
  1. 1.Klinik für Kinder und JugendlicheFriedrich-Alexander-Universität Erlangen–NürnbergErlangenGermany
  2. 2.Pathologisches Institut ErlangenFriedrich-Alexander-Universität Erlangen–NürnbergErlangenGermany

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