Renal neutrophils infiltration in antineutrophil cytoplasmic antibodies-negative pauci-immune crescentic glomerulonephritis.
BACKGROUND
This study aims to investigate the evidence of neutrophil infiltration in renal tissue from patients with antineutrophil cytoplasmic antibodies (ANCA)-negative pauci-immune crescentic glomerulonephritis (CrGN), and a comparison with their ANCA-positive counterparts was performed.


METHODS
Renal biopsy specimens from 31 patients with pauci-immune CrGN were collected. Twelve patients were ANCA negative, and 19 patients were ANCA positive. Neutrophil infiltration was investigated by staining of 2 markers, CD15 and myeloperoxidase (MPO), using immunohistochemistry.


RESULTS
Positive-stained cells of CD15 (CD15) and MPO (MPO+) were mainly located in glomeruli with cellular crescents and segmental fibrinoid necrotic lesions and in periglomerular area of cellular crescents, especially at the area of ruptured Bowman capsule. Scanty positive staining was found in normal renal tissue. The number of CD15 cells in the glomeruli and periglomerular area was significantly higher in ANCA-negative group than in ANCA-positive group (in glomeruli: 2.70 ± 1.61 versus 1.38 ± 0.85, P = 0.019; in periglomerular area: 4.35 ± 4.36 versus 1.48 ± 1.67, P = 0.047). The number of MPO+ cells in the periglomerular area was also significantly higher in ANCA-negative group than that in ANCA-positive group.


CONCLUSIONS
Renal neutrophil infiltration might play a pathogenic role in ANCA-negative pauci-immune CrGN, and the neutrophil infiltration might be more severe in ANCA-negative pauci-immune-CrGN than in ANCA-positive one.
Renal Division, Department of Medicine, Peking University First Hospital, Beijing, China.
Guang-qun
GQ
Xing
Min
M
Chen
Gang
G
Liu
Su-xia
SX
Wang
Ming-hui
MH
Zhao
D000328:Adult; D000368:Aged; D019268:Antibodies, Antineutrophil Cytoplasmic / Q000032:analysis*; D005260:Female; D005647:Fucosyltransferases / Q000032:analysis; D005921:Glomerulonephritis / Q000276:immunology* / Q000473:pathology; D006801:Humans; D007150:Immunohistochemistry; D007668:Kidney / Q000473:pathology*; D016256:Lewis X Antigen / Q000032:analysis; D008297:Male; D008875:Middle Aged; D020556:Neutrophil Infiltration; D009195:Peroxidase / Q000032:analysis
D019268:Antibodies, Antineutrophil Cytoplasmic; D016256:Lewis X Antigen; D009195:Peroxidase; C066693:FUT4 protein, human; D005647:Fucosyltransferases