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Low-Avidity Autoantibodies against Bactericidal/Permeability-Increasing Protein Occur in Gram-Negative and Gram-Positive Bacteremia.

Publication ,  Journal Article
Theprungsirikul, J; Thaden, JT; Wierzbicki, RM; Burns, AS; Skopelja-Gardner, S; Fowler, VG; Winthrop, KL; Martin, IW; Rigby, WFC
Published in: Infect Immun
September 18, 2020

Antibody autoreactivity against bactericidal/permeability-increasing protein (BPI) is strongly associated with Pseudomonas aeruginosa infection in cystic fibrosis (CF), non-CF bronchiectasis (BE), and chronic obstructive pulmonary disease (COPD). We examined the pathogen-specific nature of this autoreactivity by examining antibodies to BPI in bacteremia patients. Antibodies to BPI and bacterial antigens were measured in sera by ELISA from five patient cohorts (n = 214). Antibody avidity was investigated. Bacteremic patient sera (n = 32) exhibited IgG antibody autoreactivity against BPI in 64.7% and 46.7% of patients with positive blood cultures for P. aeruginosa and Escherichia coli, respectively. Autoantibody titers correlated with IgG responses to bacterial extracts and lipopolysaccharide (LPS). A prospective cohort of bacteremic patient sera exhibited anti-BPI IgG responses in 23/154 (14.9%) patients with autoreactivity present at the time of positive blood cultures in patients with Gram-negative and Gram-positive bacteria, including 8/60 (13.3%) patients with Staphylococcus aureus Chronic tissue infection with S. aureus was associated with BPI antibody autoreactivity in 2/15 patients (13.3%). Previously, we demonstrated that BPI autoreactivity in CF patient sera exhibits high avidity. Here, a similar pattern was seen in BE patient sera. In contrast, sera from patients with bacteremia exhibited low avidity. These data indicate that low-avidity IgG responses to BPI can arise acutely in response to bacteremia and that this association is not limited to P. aeruginosa This is to be contrasted with chronic respiratory infection with P. aeruginosa, suggesting that either the chronicity or the site of infection selects for the generation of high-avidity responses, with biologic consequences for airway immunity.

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Published In

Infect Immun

DOI

EISSN

1098-5522

Publication Date

September 18, 2020

Volume

88

Issue

10

Location

United States

Related Subject Headings

  • Staphylococcus aureus
  • Pseudomonas aeruginosa
  • Prospective Studies
  • Microbiology
  • Kinetics
  • Immunoglobulin G
  • Humans
  • Gram-Positive Bacterial Infections
  • Gram-Negative Bacterial Infections
  • Escherichia coli
 

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Theprungsirikul, J., Thaden, J. T., Wierzbicki, R. M., Burns, A. S., Skopelja-Gardner, S., Fowler, V. G., … Rigby, W. F. C. (2020). Low-Avidity Autoantibodies against Bactericidal/Permeability-Increasing Protein Occur in Gram-Negative and Gram-Positive Bacteremia. Infect Immun, 88(10). https://doi.org/10.1128/IAI.00444-20
Theprungsirikul, J., J. T. Thaden, R. M. Wierzbicki, A. S. Burns, S. Skopelja-Gardner, V. G. Fowler, K. L. Winthrop, I. W. Martin, and W. F. C. Rigby. “Low-Avidity Autoantibodies against Bactericidal/Permeability-Increasing Protein Occur in Gram-Negative and Gram-Positive Bacteremia.Infect Immun 88, no. 10 (September 18, 2020). https://doi.org/10.1128/IAI.00444-20.
Theprungsirikul J, Thaden JT, Wierzbicki RM, Burns AS, Skopelja-Gardner S, Fowler VG, et al. Low-Avidity Autoantibodies against Bactericidal/Permeability-Increasing Protein Occur in Gram-Negative and Gram-Positive Bacteremia. Infect Immun. 2020 Sep 18;88(10).
Theprungsirikul, J., et al. “Low-Avidity Autoantibodies against Bactericidal/Permeability-Increasing Protein Occur in Gram-Negative and Gram-Positive Bacteremia.Infect Immun, vol. 88, no. 10, Sept. 2020. Pubmed, doi:10.1128/IAI.00444-20.
Theprungsirikul J, Thaden JT, Wierzbicki RM, Burns AS, Skopelja-Gardner S, Fowler VG, Winthrop KL, Martin IW, Rigby WFC. Low-Avidity Autoantibodies against Bactericidal/Permeability-Increasing Protein Occur in Gram-Negative and Gram-Positive Bacteremia. Infect Immun. 2020 Sep 18;88(10).

Published In

Infect Immun

DOI

EISSN

1098-5522

Publication Date

September 18, 2020

Volume

88

Issue

10

Location

United States

Related Subject Headings

  • Staphylococcus aureus
  • Pseudomonas aeruginosa
  • Prospective Studies
  • Microbiology
  • Kinetics
  • Immunoglobulin G
  • Humans
  • Gram-Positive Bacterial Infections
  • Gram-Negative Bacterial Infections
  • Escherichia coli