Related Experiment Videos
Anti-MPO-ANCA-positive microscopic polyangiitis following subacute bacterial endocarditis
B Hellmich1, M Ehren, M Lindstaedt
1Universitätsklinik Bergmannsheil, Ruhr-Universität Bochum, Germany. Bernhard.Hellmich@ruhr-uni-bochum.de
Abstract:
Although infectious agents such as Staphylococcus aureus have been implicated in the pathogenesis of Wegener's granulomatosis, the role of bacterial infections in the pathogenesis of other types of small-vessel vasculitides associated with antineutrophil cytoplasmic antibodies (ANCA) is less clear. We describe a patient who developed a non-granulomatous necrotising small vessel vasculitis and perinuclear ANCA (p-ANCA) directed against myeloperoxidase (MPO) after recurrent episodes of bacterial endocarditis due to Staph. aureus. Although cytoplasmic ANCA (c-ANCA) directed against proteinase 3 have been reported in single patients with bacterial endocarditis, to our knowledge this patient is the first reported case of an anti-MPO-ANCA positive systemic vasculitis following bacterial endocarditis.
Insights
Bacterial endocarditis from Staphylococcus aureus can trigger anti-myeloperoxidase ANCA vasculitis. This case highlights a rare link between bacterial infection and anti-MPO ANCA-positive systemic vasculitis.
Area of Science:
- Rheumatology
- Infectious Diseases
- Immunology
Background:
- Wegener's granulomatosis pathogenesis is linked to Staphylococcus aureus.
- The role of bacterial infections in other small-vessel vasculitides associated with antineutrophil cytoplasmic antibodies (ANCA) is less understood.
Observation:
- A patient developed non-granulomatous necrotising small vessel vasculitis and perinuclear ANCA (p-ANCA) targeting myeloperoxidase (MPO).
- This occurred after recurrent bacterial endocarditis caused by Staphylococcus aureus.
Findings:
- This is the first reported case of anti-MPO-ANCA positive systemic vasculitis following bacterial endocarditis.
- While anti-proteinase 3 ANCA (c-ANCA) has been reported with endocarditis, anti-MPO ANCA association is novel.
Implications:
- Suggests bacterial infections, specifically endocarditis, can induce specific ANCA types beyond previously known associations.
- Highlights the need to consider infectious triggers in ANCA-associated vasculitis, particularly anti-MPO ANCA.
- May inform diagnostic and therapeutic strategies for ANCA-associated vasculitis with infectious histories.