Protein A suppresses immune responses during Staphylococcus aureus bloodstream infection in guinea pigs
- Univ. of Chicago, IL (United States). Dept. of Microbiology; Argonne National Lab. (ANL), Argonne, IL (United States)
Staphylococcus aureus infection is not associated with the development of protective immunity, and disease relapses occur frequently. We hypothesize that protein A, a factor that binds immunoglobulin Fcγ and cross-links VH3 clan B cell receptors (IgM), is the staphylococcal determinant for host immune suppression. To test this, vertebrate IgM was examined for protein A cross-linking. High VH3 binding activity occurred with human and guinea immunoglobulin, whereas mouse and rabbit immunoglobulins displayed little and no binding, respectively. Establishing a guinea pig model of S. aureus bloodstream infection, we show that protein A functions as a virulence determinant and suppresses host B cell responses. Immunization with SpAKKAA, which cannot bind immunoglobulin, elicits neutralizing antibodies that enable guinea pigs to develop protective immunity.
- Research Organization:
- Argonne National Laboratory (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE
- Grant/Contract Number:
- AC02-06CH11357
- OSTI ID:
- 1201740
- Journal Information:
- mBio (Online), Journal Name: mBio (Online) Journal Issue: 1 Vol. 6; ISSN 2150-7511
- Publisher:
- American Society for MicrobiologyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Similar Records
Engineered human antibodies for the opsonization and killing of Staphylococcus aureus
Molecular basis of surface anchored protein A deficiency in the Staphylococcus aureus strain Wood 46
Peptidoglycan Contribution to the B Cell Superantigen Activity of Staphylococcal Protein A
Journal Article
·
Wed Jan 19 19:00:00 EST 2022
· Proceedings of the National Academy of Sciences of the United States of America
·
OSTI ID:2470016
Molecular basis of surface anchored protein A deficiency in the Staphylococcus aureus strain Wood 46
Journal Article
·
Wed Aug 30 20:00:00 EDT 2017
· PLoS ONE
·
OSTI ID:1394588
Peptidoglycan Contribution to the B Cell Superantigen Activity of Staphylococcal Protein A
Journal Article
·
Mon Apr 26 20:00:00 EDT 2021
· mBio (Online)
·
OSTI ID:1815827