Differential Immune Responses to Segniliparus rotundus and Segniliparus rugosus Infection and Analysis of Their Comparative Virulence Profiles

Jong Seok Kim, Woo Sik Kim, Keehoon Lee, Choul Jae Won, Jin Man Kim, Seok Yong Eum, Won Jung Koh, Sung Jae Shin

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Two closely related bacterial species, Segniliparus rotundus and Segniliparus rugosus, have emerged as important human pathogens, but little is known about the immune responses they elicit or their comparative pathophysiologies. To determine the virulence and immune responses of the two species, we compared their abilities to grow in phagocytic and non-phagocytic cells. Both species maintained non-replicating states within A549 epithelial cells. S. rugosus persisted longer and multiplied more rapidly inside murine bone marrow-derived macrophages (BMDMs), induced more pro-inflammatory cytokines, and induced higher levels of macrophage necrosis. Activation of BMDMs by both species was mediated by toll-like receptor 2 (TLR2), followed by mitogen-activated protein kinases (MAPK) and nuclear factor κB (NF-κB) signaling pathways, indicating a critical role for TLR2 in Segniliparus-induced macrophage activation. S. rugosus triggered faster and stronger activation of MAPK signaling and IκB degradation, indicating that S. rugosus induces more pro-inflammatory cytokines than S. rotundus. Multifocal granulomatous inflammations in the liver and lung were observed in mice infected with S. rugosus, but S. rotundus was rapidly cleared from all organs tested within 15 days post-infection. Furthermore, S. rugosus induced faster infiltration of innate immune cells such as neutrophils and macrophages to the lung than S. rotundus. Our results suggest that S. rugosus is more virulent and induces a stronger immune response than S. rotundus.

Original languageEnglish
Article numbere59646
JournalPloS one
Volume8
Issue number3
DOIs
Publication statusPublished - 2013 Mar 29

Fingerprint

Macrophages
Virulence
macrophages
virulence
immune response
Toll-Like Receptor 2
Infection
Mitogen-Activated Protein Kinases
mitogen-activated protein kinase
infection
bone marrow
Chemical activation
cytokines
lungs
Cytokines
Bone
macrophage activation
Lung
Macrophage Activation
mice

All Science Journal Classification (ASJC) codes

  • Biochemistry, Genetics and Molecular Biology(all)
  • Agricultural and Biological Sciences(all)
  • General

Cite this

Kim, Jong Seok ; Kim, Woo Sik ; Lee, Keehoon ; Won, Choul Jae ; Kim, Jin Man ; Eum, Seok Yong ; Koh, Won Jung ; Shin, Sung Jae. / Differential Immune Responses to Segniliparus rotundus and Segniliparus rugosus Infection and Analysis of Their Comparative Virulence Profiles. In: PloS one. 2013 ; Vol. 8, No. 3.
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Differential Immune Responses to Segniliparus rotundus and Segniliparus rugosus Infection and Analysis of Their Comparative Virulence Profiles. / Kim, Jong Seok; Kim, Woo Sik; Lee, Keehoon; Won, Choul Jae; Kim, Jin Man; Eum, Seok Yong; Koh, Won Jung; Shin, Sung Jae.

In: PloS one, Vol. 8, No. 3, e59646, 29.03.2013.

Research output: Contribution to journalArticle

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AU - Kim, Jong Seok

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