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Tubulointerstitial nephritis without glomerular lesions in three patients with myeloperoxidase-ANCA-associated

Kimimasa Nakabayashi1, Ayumi Sumiishi, Katuko Sano

  • 1First Department of Internal Medicine, Kyorin University School of Medicine, Mitaka, Tokyo, Japan. kiminaka@krd.biglobe.ne.jp

Clinical and Experimental Nephrology
|June 10, 2009
PubMed
Abstract

Insights

Myeloperoxidase-antineutrophil cytoplasmic antibody (MPO-ANCA)-associated vasculitis can cause tubulointerstitial nephritis. Early MPO-ANCA vasculitis involves loss of CD34 markers on peritubular capillaries, leading to tissue destruction.

Area of Science:

  • Nephrology
  • Immunology
  • Pathology

Background:

  • Myeloperoxidase-antineutrophil cytoplasmic antibody (MPO-ANCA)-associated vasculitis typically presents as glomerulonephritis.
  • A subset of MPO-ANCA vasculitis cases exhibit tubulointerstitial (TI) nephritis without glomerular involvement.

Observation:

  • Three cases of MPO-ANCA vasculitis with isolated TI nephritis were studied.
  • Pathological analysis included immunohistochemistry for endothelial markers, basement membrane components, and inflammatory cells.

Findings:

  • Loss of CD34 endothelial markers and variable destruction of type IV collagen in peritubular capillaries were observed.
  • Electron microscopy revealed breaks in the capillary basement membrane.
  • Tubulitis and diminished cytokeratin staining in tubular epithelium were noted, correlating with clinical findings of mild urinary abnormalities.

Implications:

  • The study suggests that MPO released from neutrophils initiates peritubular capillary damage in early MPO-ANCA vasculitis.
  • This endothelial and basement membrane injury contributes to the pathogenesis of TI nephritis in MPO-ANCA vasculitis.
  • Understanding this mechanism may aid in early diagnosis and targeted therapy for MPO-ANCA-associated TI nephritis.

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