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Effect of tumor necrosis factor-alpha on intracellular Staphylococcus aureus in vascular endothelial cells

Authors
Publisher
Federation of European Microbiological Societies
Publication Date
Keywords
  • Anti-Bacterial Agents/Pharmacology
  • Apoptosis
  • Cell Line
  • Colony Count
  • Microbial
  • Endothelial Cells/*Microbiology
  • Humans
  • L-Lactate Dehydrogenase/Metabolism
  • Microbial Viability
  • Oxacillin/Pharmacology
  • Staphylococcus Aureus/*Drug Effects
  • Tumor Necrosis Factor-Alpha/*Immunology
Disciplines
  • Biology

Abstract

Although tumor necrosis factor-alpha (TNF-alpha) is an important host factor against intracellular bacteria, little is known about the effect of TNF-alpha on the persistence of intracellular Staphylococcus aureus in vascular endothelial cells. It was investigated whether recombinant human TNF-alpha influences the survival of intracellular S. aureus (ATCC 29213) in human umbilical vein endothelial cells (HUVEC) under a condition with an antistaphylococcal agent, and its mechanism. The HUVECs were incubated with TNF-alpha, oxacillin, or both in 24-well plates for up to 48 h following internalization of S. aureus (10(6) CFU well(-1)) into HUVECs for 1 h. TNF-alpha (1 ng mL(-1)) significantly reduced the number of intracellular S. aureus in HUVECs, and TNF-alpha plus oxacillin eliminated more intracellular S. aureus in HUVEC than oxacillin alone. The LDH viability assay and quantification of apoptosis using photometric enzyme-immunoassay showed that TNF-alpha preferentially induced cell death and apoptosis of HUVECs infected with S. aureus compared with noninfected HUVECs. These results indicate that TNF-alpha helps antistaphylococcal antibiotics to eliminate intracellular S. aureus in vascular endothelial cells, partly because TNF-alpha preferentially induces apoptosis of endothelial cells infected by S. aureus.

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