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Protein A suppresses immune responses during Staphylococcus aureus bloodstream infection in guinea pigs

Journal Article · · mBio (Online)
 [1];  [1];  [1];  [1];  [1]
  1. 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

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Cited By (8)

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Staphylococcal Protein A Contributes to Persistent Colonization of Mice with Staphylococcus aureus journal February 2018
Innate Immune Signaling Activated by MDR Bacteria in the Airway journal January 2016
Targeting fundamental pathways to disrupt Staphylococcus aureus survival: clinical implications of recent discoveries journal March 2018
The recombination dynamics of Staphylococcus aureus inferred from spA gene journal July 2016
Characterization of recombinant wild-type and nontoxigenic protein A from Staphylococcus pseudintermedius text January 2018
Characterization of recombinant wild-type and nontoxigenic protein A from Staphylococcus pseudintermedius text January 2018

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