Staphylococcal protein A–formulated immune complexes suppress enterotoxin-induced cellular responses in nasal polyps - 06/08/15
, Tazuko Fujiwara, BS a, Shin Kariya, MD a, Takenori Haruna, MD a, Takaya Higaki, MD a, Yasuyuki Noyama, MD a, Sei-ichiro Makihara, MD b, Kengo Kanai, MD c, Kazunori Nishizaki, MD aAbstract |
Background |
Recent studies have revealed that Staphylococcus aureus and its components participate in the pathogenesis of eosinophilic airway diseases, such as chronic rhinosinusitis with nasal polyps.
Objective |
We sought to determine whether staphylococcal protein A (SpA) from S aureus regulated cellular responses in nasal polyps, especially when coupled to immunoglobulins in immune complexes (ICs).
Methods |
Dispersed nasal polyp cells (DNPCs) or peripheral blood monocytes were cultured in vitro with SpA in the presence or absence of IgG, and IL-5, IL-13, IFN-γ, IL-17A, and IL-10 levels were measured in the supernatants. The effect of SpA exposure on staphylococcal enterotoxin B–induced cytokine production by DNPCs in the presence and absence of IgG, IgA, and autologous serum was also examined.
Results |
Exposure to SpA induced DNPCs to produce significantly higher IL-10, IL-13, and IL-17A levels than DNPCs without SpA, although the magnitude of the IL-17A increase was less than that of IL-10 and IL-13. SpA induced IL-10 production mainly from adherent DNPCs, and this was significantly enhanced in the presence of IgG; similar results were observed in peripheral blood monocytes. IC formation between SpA and IgG (SpA-IgG ICs) was confirmed by using native polyacrylamide gel electrophoresis. SpA-IgG ICs, but not SpA alone, almost completely suppressed staphylococcal enterotoxin B–induced IL-5, IL-13, IFN-γ, and IL-17A production by DNPCs; similar inhibition was observed in DNPCs treated with SpA in the presence of either IgA or autologous serum.
Conclusions |
Our results suggest that SpA can regulate the pathogenesis of enterotoxin-induced inflammation in patients with chronic rhinosinusitis with nasal polyps through coupling to immunoglobulins.
Le texte complet de cet article est disponible en PDF.Key words : Chronic rhinosinusitis with nasal polyps, cytokines, enterotoxins, immune complexes, immunoglobulins, immune evasion, Staphylococcus aureus, staphylococcal protein A
Abbreviations used : CRS, CRSsNP, CRSwNP, DNPC, IC, SEB, SpA, SpA+AS, TLR, TNFR1
Plan
| Supported in part by grants from the Ministry of Education, Culture, Sports, Science, and Technology, Japan (23592511 and 26670742). |
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| Disclosure of potential conflict of interest: The authors declare that they have no relevant conflicts of interest. |
Vol 136 - N° 2
P. 343 - août 2015 Retour au numéro
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