Successful Pregnancy and Delivery of a Healthy Newborn Despite Transplacental Transfer of Antimyeloperoxidase Antibodies From a Mother With Microscopic Polyangiitis

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Abstract

Myeloperoxidase (MPO)-specific antineutrophil cytoplasmic antibodies have been proposed as pathogenic for microscopic polyangiitis. Supporting this hypothesis, a case report of transplacental anti-MPO antibody transfer presumably causing a vasculitis-like syndrome in the newborn is cited frequently. Here, we report a case of transplacental transfer of high levels of anti-MPO antibodies not resulting in clinical compromise in the newborn. The mother developed microscopic polyangiitis 5 years before the pregnancy. After induction therapy, remission was maintained with low-dose prednisone and azathioprine for 4.5 years despite high levels of anti-MPO antibodies (>100 U/mL). The patient elected to become pregnant, immunosuppression was maintained during pregnancy, and a normal-term neonate was delivered. The newborn's venous blood anti-MPO antibody levels decreased gradually from greater than 100 U/mL at birth to undetectable by day 120. No clinical manifestation of vasculitis developed in the newborn. This case supports that anti-MPO antibodies alone are not pathogenic without additional cofactors.

Original languageEnglish (US)
Pages (from-to)542-545
Number of pages4
JournalAmerican Journal of Kidney Diseases
Volume54
Issue number3
DOIs
StatePublished - Sep 1 2009

Keywords

  • Vasculitis
  • antineutrophil cytoplasmic antibodies (ANCAs)
  • microscopic polyangiitis (MPA)
  • myeloperoxidase (MPO)

ASJC Scopus subject areas

  • Nephrology

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