NDLI: Yersinia enterocolitica Invasin Protein Triggers Differential Production of Interleukin-1, Interleukin-8, Monocyte Chemoattractant Protein 1, Granulocyte-Macrophage Colony-Stimulating Factor, and Tumor Necrosis Factor Alpha in Epithelial Cells: Implications for Understanding the Early Cytokine Network in Yersinia Infections

Content Provider	PubMed Central
Author	Daniel, Kampik Schulte, Ralf Autenrieth, Ingo B.
Editor	Clements, J. D.
Copyright Year	2000
Abstract	Yersinia enterocolitica infection of epithelial cells results in interleukin-8 (IL-8) mRNA expression. Herein we demonstrate that besides IL-8, increased mRNA levels of five other cytokines, IL-1α, IL-1β, monocyte chemoattractant protein 1 (MCP-1), granulocyte-macrophage colony-stimulating factor (GM-CSF), and tumor necrosis factor alpha (TNF-α), can be detected upon infection of HeLa cells with Yersinia. Yersinia-triggered cytokine production was not affected by blocking phosphatidylinositol-3-phosphate kinase with wortmannin, which inhibited bacterial invasion. Comparable cytokine mRNA responses were triggered by Escherichia coli expressing Yersinia inv, while no response was triggered by an inv-deficient Yersinia mutant. Moreover, cytokine responses were independent from metabolic activity of the bacteria, as killed bacterial cells were sufficient for triggering cytokine responses in HeLa cells. Semiquantitative reverse transcription-PCR analysis was used to assess the kinetics of cytokine mRNA expression in infected HeLa cells. IL-8, IL-1α, IL-1β, MCP-1, GM-CSF, and TNF-α mRNA expression increased within 1 h postinfection, reached a maximum after 3 to 4 h, and then declined to preinfection levels within 3 h. IL-8, MCP-1, and GM-CSF were secreted by HeLa cells, whereas IL-1α and IL-1β were not secreted and thus were found exclusively intracellularly. TNF-α protein could not be detected in cell lysates or supernatants. Stimulation of HeLa cells with IL-1α was followed by increased IL-8 mRNA expression, whereas stimulation with IL-8 did not induce cytokine production. Likewise, MCP-1 and GM-CSF did not induce significant cytokine responses in HeLa cells. Our results implicate that the initial host response to Yersinia infection might be sustained by IL-8, MCP-1, and GM-CSF produced by epithelial cells.
Starting Page	2484
File Format	PDF
ISSN	10985522
e-ISSN	10985522
Journal	Infection and Immunity
Issue Number	5
Volume Number	68
Language	English
Publisher	American Society for Microbiology
Publisher Date	2000-05-01
Access Restriction	Open
Rights Holder	American Society for Microbiology
Subject Keyword	Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Infectious Diseases Parasitology Immunology Microbiology

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