title: Identification and validation of urinary biomarkers for differential diagnosis and evaluation of therapeutic intervention in anti-neutrophil cytoplasmic antibody-associated vasculitis.
abstract: Renal activity and smoldering disease is difficult to assess in anti-neutrophil cytoplasmic antibody-associated vasculitis (AAV) because of renal scarring. Even repeated biopsies suffer from sampling errors in this focal disease especially in patients with chronic renal insufficiency. We applied capillary electrophoresis coupled to mass spectrometry toward urine samples from patients with active renal AAV to identify and validate urinary biomarkers that enable differential diagnosis of disease and assessment of disease activity. The data were compared with healthy individuals, patients with other renal and non-renal diseases, and patients with AAV in remission. 113 potential biomarkers were identified that differed significantly between active renal AAV and healthy individuals and patients with other chronic renal diseases. Of these, 58 could be sequenced. Sensitivity and specificity of models based on 18 sequenced biomarkers were validated using blinded urine samples of 40 patients with different renal diseases. Discrimination of AAV from other renal diseases in blinded samples was possible with 90% sensitivity and 86.7-90% specificity depending on the model. 10 patients with active AAV were followed for 6 months after initiation of treatment. Immunosuppressive therapy led to a change of the proteome toward "remission." 47 biomarkers could be sequenced that underwent significant changes during therapy together with regression of clinical symptoms, normalization of C-reactive protein, and improvement of renal function. Proteomics analysis with capillary electrophoresis-MS represents a promising tool for fast identification of patients with active AAV, indication of renal relapses, and monitoring for ongoing active renal disease and remission without renal biopsy.
authors: Department of Nephrology, Hannover Medical School, D-30625 Hannover, Germany. Haubitz.Marion@MH-Hannover.de
authors: Marion
authors: M
authors: Haubitz
authors: David M
authors: DM
authors: Good
authors: Alexander
authors: A
authors: Woywodt
authors: Hermann
authors: H
authors: Haller
authors: Harald
authors: H
authors: Rupprecht
authors: Dan
authors: D
authors: Theodorescu
authors: Mohammed
authors: M
authors: Dakna
authors: Joshua J
authors: JJ
authors: Coon
authors: Harald
authors: H
authors: Mischak
mesh_terms: D000328:Adult; D056648:Anti-Neutrophil Cytoplasmic Antibody-Associated Vasculitis / Q000175:diagnosis* / Q000473:pathology / Q000628:therapy* / Q000652:urine*; D019540:Area Under Curve; D015415:Biomarkers / Q000652:urine*; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D007668:Kidney / Q000473:pathology; D008297:Male; D008875:Middle Aged; D011506:Proteins / Q000032:analysis; D020543:Proteome / Q000032:analysis*; D012074:Remission Induction; D015203:Reproducibility of Results; D016896:Treatment Outcome; D055815:Young Adult
chemical_list: D015415:Biomarkers; D011506:Proteins; D020543:Proteome