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Commercial Intravenous Immunoglobulin Preparations Contain Functional Neutralizing Antibodies against the Staphylococcus aureus Leukocidin LukAB (LukGH).

Authors :
Wood JB
Jones LS
Soper NR
Nagarsheth M
Creech CB
Thomsen IP
Source :
Antimicrobial agents and chemotherapy [Antimicrob Agents Chemother] 2017 Oct 24; Vol. 61 (11). Date of Electronic Publication: 2017 Oct 24 (Print Publication: 2017).
Publication Year :
2017

Abstract

The pathogenesis of Staphylococcus aureus is mediated by an array of important virulence factors, including the two-component leukocidin family of toxins. LukAB (also known as LukGH), the most recently discovered leukocidin, is potently lethal to phagocytes, produced during invasive human disease, and present in all known clinical isolates of S. aureus Intravenous immunoglobulin (IVIg) is often used clinically in severe S. aureus infections. The primary aim of this study was to assess the binding and neutralization potential of IVIg against LukAB. A secondary aim was to examine the lot-to-lot variability of IVIg in the binding and neutralization of LukAB. We studied 24 distinct lots of IVIg and compared them to serum from children with invasive S. aureus infection (in the acute and convalescent phases) and from healthy, uninfected controls. We found that all lots of IVIg contained functional antibodies targeting LukAB. After adjusting for total antibody content per sample, we found that the amount of anti-LukAB antibody in IVIg was similar to that seen with healthy controls and less than that seen with patients with invasive S. aureus infection. IVIg samples had lower neutralization capacity than samples from healthy controls and children with invasive infection. IVIg had remarkably little lot-to-lot variation in LukAB binding but had significantly more variation in toxin neutralization. These results represent the first report of functional antibodies against the important S. aureus leukocidin LukAB in IVIg. Given the frequent clinical use of IVIg for severe S. aureus infections, improving our understanding of functional antibody properties exhibited by this therapeutic is essential.<br /> (Copyright © 2017 American Society for Microbiology.)

Details

Language :
English
ISSN :
1098-6596
Volume :
61
Issue :
11
Database :
MEDLINE
Journal :
Antimicrobial agents and chemotherapy
Publication Type :
Academic Journal
Accession number :
28874371
Full Text :
https://doi.org/10.1128/AAC.00968-17