Surfactant Protein A (SP-A)-mediated Clearance of Staphylococcus aureus Involves Binding of SP-A to the Staphylococcal Adhesin Eap and the Macrophage Receptors SP-A Receptor 210 and Scavenger Receptor Class A*

Staphylococcus aureus causes life-threatening pneumonia in hospitals and deadly superinfection during viral influenza. The current study investigated the role of surfactant protein A (SP-A) in opsonization and clearance of S. aureus. Previous studies showed that SP-A mediates phagocytosis via the SP-A receptor 210 (SP-R210). Here, we show that SP-R210 mediates binding and control of SP-A-opsonized S. aureus by macrophages. We determined that SP-A binds S. aureus through the extracellular adhesin Eap. Consequently, SP-A enhanced macrophage uptake of Eap-expressing (Eap+) but not Eap-deficient (Eap−) S. aureus. In a reciprocal fashion, SP-A failed to enhance uptake of Eap+ S. aureus in peritoneal Raw264.7 macrophages with a dominant negative mutation (SP-R210(DN)) blocking surface expression of SP-R210. Accordingly, WT mice cleared infection with Eap+ but succumbed to sublethal infection with Eap- S. aureus. However, SP-R210(DN) cells compensated by increasing non-opsonic phagocytosis of Eap+ S. aureus via the scavenger receptor scavenger receptor class A (SR-A), while non-opsonic uptake of Eap− S. aureus was impaired. Macrophages express two isoforms: SP-R210L and SP-R210S. The results show that WT alveolar macrophages are distinguished by expression of SP-R210L, whereas SR-A−/− alveolar macrophages are deficient in SP-R210L expressing only SP-R210S. Accordingly, SR-A−/− mice were highly susceptible to both Eap+ and Eap− S. aureus. The lungs of susceptible mice generated abnormal inflammatory responses that were associated with impaired killing and persistence of S. aureus infection in the lung. In conclusion, alveolar macrophage SP-R210L mediates recognition and killing of SP-A-opsonized S. aureus in vivo, coordinating inflammatory responses and resolution of S. aureus pneumonia through interaction with SR-A.

• Publication year

  2010

• Venue

  Journal of Biological Chemistry

• Publication date

  2010-12-01

• Fields of study

  Biology, Medicine

• Identifiers
  DOI 10.1074/jbc.M110.125567PMID 21123169PMCID PMC3039347
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar, PubMed

• No claims are published for this paper.

• No concepts are published for this paper.

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