The Adhesion of Protein A‐Bearing <i>Staphylococcus aureus</i> Organisms to Soluble‐Staphylococcal‐Antigens‐Coated HeLa Cells Mediated by Specific Antibodies

Murai, Miyo; Sakurada, Junji; Seki, Kazuhiko; Ogasawara, Masahito; Arai, Yasuo; Edamura, Keiko; Masuda, Shōgo

doi:10.1111/j.1348-0421.1991.tb01528.x

Microbiology and Immunology

1991

DOI: 10.1111/j.1348-0421.1991.tb01528.x

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The Adhesion of Protein A‐Bearing Staphylococcus aureus Organisms to Soluble‐Staphylococcal‐Antigens‐Coated HeLa Cells Mediated by Specific Antibodies

Miyo Murai

Junji Sakurada

Kazuhiko Seki

et al.

Abstract: The adhesion of staphylococcal protein A (SpA)-bearing Staphylococcus aureus Cowan I organisms to HeLa cells was enhanced by pretreatment of HeLa cells with staphylococcal extracellular antigens and antibodies to them.

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1992

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“…Although the precise immunological and microbiological functions of staphylococcal protein A are unclear, this protein is considered to posses antiphagocytic properties and to inhibit phagocyte-mediated killing [2,[24][25][26][27]. These effects are due to the ability of SpA to bind to IgG, to compete with phagocytic cells for available IgG-Fc sites [25], and to diminish IgG-mediated opsonization or random SpA-mediated complement activation.…”

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Interaction of fibronectin and fibronectin binding protein (FnBP) of Staphylococcus aureus with murine phagocytes and lymphocytes

Różalska

1992

FEMS Microbiology Letters

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In the present study we examined the in vitro and in vivo interactions of a cloned staphylococcal fibronectin binding protein (FnBP) and plasma fibronectin (Fn) with polymorphonuclear cells (PMNs) and macrophages, and how antibodies against FnBP affect the phagocytosis process in vitro. Moreover, the interaction of FnBP and Fn coupled on latex beads as ‘artificial bacteria’ and ‘artificially opsonized bacteria’ with murine spleen cells and peritoneal macrophages was tested. The major finding of the present study is that antibodies against the FnBP of Staphylococcus aureus (S. aureus) and low concentration of antibodies recognized two IgG‐binding domains of protein A (SpA) are effective in the promotion of phagocytosis in vitro. It was also observed that FnBP has a chemoattractant activity and causes accumulation of PMNs and macrophages in the mouse peritoneal cavity when injected 24 h before irritation of peritoneal exudate. It seems likely that this activity is connected with binding to Fn molecules since formalin inactivation of FnBP (60%) abolished it. In the in vitro phagocytosis assay in the presence of FnBP (in a medium supplemented with serum depleted of Fn), ingestion of bacteria by phagocytes was identical to assay carried out in the presence of BSA. However, addition of plasma fibronectin caused an increased uptake of bacteria by macrophages and to a lesser degree by PMNs. We observed that in a population of normal splenocytes, those cells that effectively bound FnBP‐ and Fn‐coated latex beads were mostly those cells exbiting macrophage and dendritic morphology. In populations of spleen cells of animals infected with S. aureus, T lymphocytes were also found to bind FnBP‐ and Fn‐coated latex beads. These data suggest that FnBP may have the ability to promote aggregation of immune cells, either directly or by interaction with plasma Fn, which can be helpful in certain cell‐cell interactions taking place at the initial stages of specific immune response.

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confidence: 99%

Interaction of fibronectin and fibronectin binding protein (FnBP) of Staphylococcus aureus with murine phagocytes and lymphocytes

Różalska

1992

FEMS Microbiology Letters

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The Adhesion of Protein A‐Bearing Staphylococcus aureus Organisms to Soluble‐Staphylococcal‐Antigens‐Coated HeLa Cells Mediated by Specific Antibodies

Abstract: The adhesion of staphylococcal protein A (SpA)-bearing Staphylococcus aureus Cowan I organisms to HeLa cells was enhanced by pretreatment of HeLa cells with staphylococcal extracellular antigens and antibodies to them.

Cited by 1 publication

References 25 publications

Interaction of fibronectin and fibronectin binding protein (FnBP) of Staphylococcus aureus with murine phagocytes and lymphocytes

Interaction of fibronectin and fibronectin binding protein (FnBP) of Staphylococcus aureus with murine phagocytes and lymphocytes

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