Antigen specificity in hydralazine associated ANCA positive systemic vasculitis

Area of Science:

• Nephrology
• Immunology
• Rheumatology

Background:

• Hydralazine, an antihypertensive drug, can cause a lupus-like syndrome, typically sparing the kidneys.
• This drug can also induce systemic vasculitis with glomerulonephritis, linked to neutrophil cytoplasmic autoantibodies.
• Antibodies against double-stranded DNA are uncommon in hydralazine-induced lupus-like syndrome.

Purpose of the Study:

• To investigate the autoantibody profiles in patients with hydralazine-induced vasculitis.
• To compare the frequency of renal involvement in hydralazine-induced vasculitis versus the lupus-like syndrome.

Main Methods:

• Analysis of autoantibody specificities in ten patients with hydralazine-induced vasculitis.
• Comparison of clinical and serological findings between hydralazine-induced vasculitis and lupus-like syndrome.

Main Results:

• Ten patients with hydralazine-induced vasculitis exhibited antibodies against myeloperoxidase and lactoferrin.
• This autoantibody pattern, along with antinuclear antibodies including anti-double-stranded DNA, may characterize hydralazine-induced vasculitis.
• Renal involvement was more prevalent in patients with hydralazine-induced vasculitis compared to those with the lupus-like syndrome.

Conclusions:

• Hydralazine-induced vasculitis is associated with a distinct autoantibody profile including anti-myeloperoxidase and anti-lactoferrin antibodies.
• The presence of antibodies against nuclear components, including double-stranded DNA, is also noted in hydralazine-induced vasculitis.
• Renal complications appear more frequent in hydralazine-induced vasculitis than in the hydralazine-induced lupus-like syndrome.