Related Experiment Video

Updated: Oct 26, 2026

Analyses of Proteinuria, Renal Infiltration of Leukocytes, and Renal Deposition of Proteins in Lupus-prone MRL/lpr Mice
09:43

Analyses of Proteinuria, Renal Infiltration of Leukocytes, and Renal Deposition of Proteins in Lupus-prone MRL/lpr Mice

Published on: June 8, 2022

[Renal microscopic polyarteritis replaced by pericarditis with episodic increases in MPO-ANCA in a patient with

K Tomori1, H Okada, H Nemoto

  • 1Department of Nephrology, Saitama Medical College, Japan.

Nihon Jinzo Gakkai Shi
|January 20, 1999
PubMed

Insights

This case highlights that myeloperoxidase-antineutrophil cytoplasmic antibodies (MPO-ANCA) may indicate systemic lupus erythematosus (SLE) activity, not just microscopic polyarteritis. Careful evaluation is crucial for MPO-ANCA in SLE patients.

Area of Science:

  • Nephrology
  • Rheumatology
  • Immunology

Background:

  • Systemic lupus erythematosus (SLE) is a chronic autoimmune disease with diverse clinical manifestations.
  • Microscopic polyarteritis is a vasculitis often associated with MPO-ANCA.
  • Distinguishing the specific autoimmune activity indicated by MPO-ANCA in complex cases is clinically important.

Observation:

  • A patient presented with acute renal failure, diagnosed as MPO-ANCA-associated microscopic polyarteritis, but underlying SLE was identified.
  • Initial treatment with prednisolone and cyclophosphamide improved renal function and lowered MPO-ANCA titers.
  • Recurrence of symptoms, including pericarditis and pleural effusion, coincided with rising MPO-ANCA levels, despite minimal renal biopsy abnormalities.

Findings:

  • MPO-ANCA titers correlated with SLE activity (pericarditis) rather than active polyarteritis.
  • Successful treatment of SLE manifestations led to a decrease in MPO-ANCA levels.
  • The patient's renal injury and polyarteritis were attributed to SLE.

Implications:

  • MPO-ANCA may serve as a marker for SLE activity, particularly in patients with overlapping features of vasculitis.
  • Clinical interpretation of MPO-ANCA requires careful consideration of the full clinical picture in SLE patients.
  • This case underscores the complexity of ANCA-associated vasculitis in the context of SLE.

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