title: The interaction between circulating complement proteins and cutaneous microvascular endothelial cells in the development of childhood Henoch-Schönlein Purpura.
abstract: OBJECTIVE
  In addition to IgA, the deposition of complement (C)3 in dermal vessels is commonly found in Henoch-Schönlein purpura (HSP). The aim of this study is to elucidate the role of circulating complement proteins in the pathogenesis of childhood HSP.
  
  
  METHODS
  Plasma levels of C3a, C4a, C5a, and Bb in 30 HSP patients and 30 healthy controls were detected by enzyme-linked immunosorbent assay (ELISA). The expression of C3a receptor (C3aR), C5a receptor (CD88), E-selectin, intercellular adhesion molecule 1 (ICAM-1), C3, C5, interleukin (IL)-8, monocyte chemotactic protein (MCP)-1, and RANTES by human dermal microvascular endothelial cells (HMVEC-d) was evaluated either by flow cytometry or by ELISA.
  
  
  RESULTS
  At the acute stage, HSP patients had higher plasma levels of C3a (359.5 ± 115.3 vs. 183.3 ± 94.1 ng/ml, p < 0.0001), C5a (181.4 ± 86.1 vs. 33.7 ± 26.3 ng/ml, p < 0.0001), and Bb (3.7 ± 2.6 vs. 1.0 ± 0.6 μg/ml, p < 0.0001), but not C4a than healthy controls. Although HSP patient-derived acute phase plasma did not alter the presentation of C3aR and CD88 on HMVEC-d, it enhanced the production of endothelial C3 and C5. Moreover, C5a was shown in vitro to up-regulate the expression of IL-8, MCP-1, E-selectin, and ICAM-1 by HMVEC-d with a dose-dependent manner.
  
  
  CONCLUSIONS
  In HSP, the activation of the complement system in part through the alternative pathway may have resulted in increased plasma levels of C3a and C5a, which, especially C5a, may play a role in the disease pathogenesis by activating endothelium of cutaneous small vessels.
authors.affiliation: Department of Pediatrics, National Taiwan University Hospital, College of Medicine, National Taiwan University, Taipei, Taiwan.
authors.forename: Yao-Hsu
authors.initials: YH
authors.lastname: Yang
authors.affiliation: Department of Pediatrics, National Taiwan University Hospital, College of Medicine, National Taiwan University, Taipei, Taiwan.
authors.forename: I-Jung
authors.initials: IJ
authors.lastname: Tsai
authors.affiliation: Graduate Institute of Oncology, College of Medicine, National Taiwan University, Taipei, Taiwan.
authors.forename: Chun-Jung
authors.initials: CJ
authors.lastname: Chang
authors.affiliation: Department of Clinical Laboratory Sciences and Medical Biotechnology, College of Medicine, National Taiwan University, Taipei, Taiwan.
authors.forename: Ya-Hui
authors.initials: YH
authors.lastname: Chuang
authors.affiliation: Department of Pediatrics, National Taiwan University Hospital, College of Medicine, National Taiwan University, Taipei, Taiwan.
authors.forename: Hui-Yao
authors.initials: HY
authors.lastname: Hsu
authors.affiliation: Department of Medical Research, National Taiwan University Hospital, Taipei, Taiwan; Graduate Institute of Clinical Medicine, College of Medicine, National Taiwan University, Taipei, Taiwan.
authors.forename: Bor-Luen
authors.initials: BL
authors.lastname: Chiang
mesh_terms: D000293:Adolescent; D016022:Case-Control Studies; D002478:Cells, Cultured; D002648:Child; D002675:Child, Preschool; D003165:Complement System Proteins / Q000378:metabolism*; D016207:Cytokines / Q000378:metabolism; D042783:Endothelial Cells / Q000166:cytology / Q000378:metabolism*; D005260:Female; D006801:Humans; D011695:IgA Vasculitis / Q000097:blood* / Q000473:pathology*; D007223:Infant; D008297:Male; D012867:Skin / Q000166:cytology / Q000378:metabolism / Q000473:pathology*
chemical_list: D016207:Cytokines; D003165:Complement System Proteins