Synergistic effect of antibodies to human leukocyte antigens and defensins in pathogenesis of bronchiolitis obliterans syndrome after human lung transplantation.
BACKGROUND
This study aims to determine the role of antibodies to donor-mismatched human leukocyte antigen (HLA) developed during the post-transplant period in inducing defensins and their synergistic role in the pathogenesis of chronic rejection, bronchiolitis obliterans syndrome (BOS), after human lung transplantation (LTx).


METHODS
Bronchoalveolar lavage (BAL) and serum from 21 BOS+ LTx patients were assayed for β-defensins human neutrophil peptides (HNP) 1-3 (enzyme-linked immunosorbent assay [ELISA]) and anti-HLA antibodies (Luminex, Luminex Corp, Austin, TX). Human airway epithelial cells (AEC) were treated with anti-HLA antibodies, HNP-1/2, or both, and the levels of β-defensin were measured by ELISA. Using a mouse model of obliterative airway disease induced by anti-major histocompatibility (MHC) class-I antibodies, we quantitatively and qualitatively determined neutrophil infiltration by myeloperoxidase (MPO) staining and activity by MPO assay, and defensin levels in the BAL.


RESULTS
In human LTx patients, higher defensin levels correlated with presence of circulating anti-HLA antibodies (p < 0.05). AEC treated with anti-HLA antibodies or HNP-1/2, produced β-defensin with synergistic effects in combination (612 ± 06 vs 520 ± 23 pg/ml anti-HLA antibody, or 590 ± 10 pg/ml for HNP treatment; p < 0.05). Neutrophil numbers (6-fold) and activity (5.5-fold) were higher in the lungs of mice treated with anti-MHC antibodies vs control. A 2-fold increase in α-defensin and β-defensin levels was also present in BAL on Day 5 after anti-MHC administrations.


CONCLUSIONS
Anti-HLA antibodies developed during the post-transplant period and α-defensins stimulated β-defensin production by epithelial cells, leading to increased cellular infiltration and inflammation. Chronic stimulation of epithelium by antibodies to MHC and resulting increased levels of defensins induce growth factor production and epithelial proliferation contributing to the development of chronic rejection after LTx.
Saini
Deepti
D
Department of Surgery, Washington University School of Medicine, St. Louis, Missouri 63110, USA.
Angaswamy
Nataraju
N
Tiriveedhi
Venkataswarup
V
Fukami
Naohiko
N
Ramachandran
Sabarinathan
S
Hachem
Ramsey
R
Trulock
Elbert
E
Meyers
Brian
B
Patterson
Alexander
A
Mohanakumar
Thalachallour
T
D000818:Animals; D000888:Antibodies, Anti-Idiotypic / Q000032:analysis / Q000097:blood*; D001989:Bronchiolitis Obliterans / Q000209:etiology / Q000276:immunology*; D001992:Bronchoalveolar Lavage Fluid / Q000737:chemistry / Q000276:immunology; D004195:Disease Models, Animal; D004847:Epithelial Cells / Q000276:immunology; D006084:Graft Rejection / Q000276:immunology; D006680:HLA Antigens / Q000276:immunology*; D006801:Humans; D016040:Lung Transplantation / Q000009:adverse effects / Q000276:immunology*; D051379:Mice; D008807:Mice, Inbred BALB C; D020556:Neutrophil Infiltration; D009195:Peroxidase / Q000032:analysis; D023084:alpha-Defensins / Q000032:analysis / Q000276:immunology*; D023083:beta-Defensins / Q000096:biosynthesis* / Q000097:blood
D000888:Antibodies, Anti-Idiotypic; D006680:HLA Antigens; D023084:alpha-Defensins; D023083:beta-Defensins; C406413:human neutrophil peptide 1; C406416:human neutrophil peptide 2; C406427:human neutrophil peptide 3; D009195:Peroxidase