1887

Abstract

-carbapenemase-producing (KPC) sequence-type 258 (ST258) has emerged as an important human pathogen throughout the world. Although lacking known virulence factors, it is associated with significant morbidity and high mortality rates. The pathogenicity of KPC ST258 strains has not been fully elucidated yet. We sought to investigate the interactions of the KPC ST258-clade I with different components of innate immunity. Human serum was used to evaluate the serum bactericidal activity and the J774A.1 murine (BALB/c mice) macrophage cell-line was used to examine phagocytosis, mRNA expression and production of the pro-inflammatory cytokines IL-1β, TNF-α and IL-6. L-78, a KPC-producing ST258-clade I strain was used as representative of the strains circulating in Greek hospitals. ATCC 43816, a virulent K2 strain, was used for comparison. Strain L-78 was susceptible to human serum and rapidly phagocytosed by J774A.1 cells, in contrast to the virulent K2 strain, which was serum-resistant and slowly phagocytosed. Stimulation of the J774A.1 cells with the L-78 strain induced production of IL-1β at concentration levels significantly higher compared to K2, whereas production of TNF-α and IL-6 levels were comparable by the two strains. L-78 was able to induce IL-1β mRNA and NLRP3 mRNA expression. Our findings indicate that ST258-clade I is serum sensitive, rapidly phagocytosed and is capable of eliciting adequate innate immune response in terms of production of pro-inflammatory cytokines.

Funding
This study was supported by the:
  • Special Account for Research Grants (ELKE) of the National and Kapodistrian University of Athens (Award 9230)
    • Principle Award Recipient: GeorgeL. Daikos
  • This is an open-access article distributed under the terms of the Creative Commons Attribution NonCommercial License.
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2021-11-02
2024-03-29
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