PMID- 22913983 OWN - NLM STAT- MEDLINE DCOM- 20130617 LR - 20151119 IS - 1523-1755 (Electronic) IS - 0085-2538 (Linking) VI - 83 IP - 1 DP - 2013 Jan TI - Circulating complement activation in patients with anti-neutrophil cytoplasmic antibody-associated vasculitis. PG - 129-37 LID - 10.1038/ki.2012.313 [doi] AB - Studies in animal models suggest that complement activation is crucial in the pathogenesis of anti-neutrophil cytoplasmic antibody-associated vasculitis (AAV). Here we investigate the circulating complement activation profile of 66 patients with active stage AAV compared to that of 54 patients with AAV in remission. Plasma levels of C3a, C5a, soluble C5b-9, and Bb, all determined by enzyme-linked immunosorbent assay, were significantly higher in active stage than in remission of AAV, while plasma levels of properdin were significantly lower in the former than the latter disease stage. There was no significant difference in the plasma levels of C4d between active stage and remission. The plasma level of Bb in patients with active AAV significantly correlated with the proportion of total and cellular crescents in the renal biopsy, the erythrocyte sedimentation rate, and the Birmingham Vasculitis Activity Scores. Thus, systemic activation of complement by the alternative pathway takes place in human AAV. Circulating Bb might be a useful biomarker in assessing disease activity of AAV. FAU - Gou, Shen-Ju AU - Gou SJ AD - Renal Division, Department of Medicine, Peking University First Hospital, Institute of Nephrology, Peking University, Key Laboratory of Renal Disease, Ministry of Health of China, Key Laboratory of CKD Prevention and Treatment, Ministry of Education of China, Beijing, China. FAU - Yuan, Jun AU - Yuan J FAU - Chen, Min AU - Chen M FAU - Yu, Feng AU - Yu F FAU - Zhao, Ming-Hui AU - Zhao MH LA - eng PT - Comparative Study PT - Journal Article PT - Research Support, Non-U.S. Gov't DEP - 20120822 PL - United States TA - Kidney Int JT - Kidney international JID - 0323470 RN - 0 (Biomarkers) RN - 0 (Immunosuppressive Agents) RN - 0 (Peptide Fragments) RN - 80295-42-7 (Complement C3a) RN - 80295-50-7 (Complement C4b) RN - 80295-52-9 (complement C4d) RN - 80295-54-1 (Complement C5a) RN - 80295-55-2 (Complement C5b) RN - EC 3.4.21.47 (Complement Factor B) SB - IM CIN - Kidney Int. 2013 Jan;83(1):16-8. PMID: 23271485 CIN - Kidney Int. 2013 Nov;84(5):1048-9. PMID: 24172736 CIN - Kidney Int. 2013 Nov;84(5):1048. PMID: 24172737 MH - Adolescent MH - Adult MH - Aged MH - Aged, 80 and over MH - Anti-Neutrophil Cytoplasmic Antibody-Associated Vasculitis/*blood/*diagnosis/drug therapy MH - Biomarkers/blood MH - *Complement Activation MH - Complement C3a/metabolism MH - Complement C4b/metabolism MH - Complement C5a/metabolism MH - Complement C5b/metabolism MH - Complement Factor B/*metabolism MH - Female MH - Humans MH - Immunosuppressive Agents/therapeutic use MH - Male MH - Middle Aged MH - Peptide Fragments/metabolism MH - Remission Induction MH - *Severity of Illness Index MH - Young Adult EDAT- 2012/08/24 06:00 MHDA- 2013/06/19 06:00 CRDT- 2012/08/24 06:00 PHST- 2012/08/24 06:00 [entrez] PHST- 2012/08/24 06:00 [pubmed] PHST- 2013/06/19 06:00 [medline] AID - S0085-2538(15)55692-5 [pii] AID - 10.1038/ki.2012.313 [doi] PST - ppublish SO - Kidney Int. 2013 Jan;83(1):129-37. doi: 10.1038/ki.2012.313. Epub 2012 Aug 22.