Interferon consensus sequence binding protein confers resistance against Yersinia enterocolitica

Area of Science:

• Immunology
• Microbiology
• Molecular Biology

Background:

• Interferon consensus sequence binding protein (ICSBP)-deficient mice are susceptible to intracellular pathogens due to impaired macrophage function and T helper 1 responses.
• ICSBP plays a critical role in regulating immune responses to various infections.

Purpose of the Study:

• To investigate the role of ICSBP in host resistance against the extracellular bacterium Yersinia enterocolitica.
• To evaluate the therapeutic potential of IL-12 and IL-18 in combating Yersinia infection in ICSBP-deficient mice.

Main Methods:

• Yersinia enterocolitica infection model in ICSBP-deficient mice.
• Analysis of cytokine production (IL-12, IFN-gamma, IL-4) and immune cell responses.
• In vitro and in vivo administration of recombinant IL-12 (rIL-12) and IL-18.

Main Results:

• ICSBP(-/-) mice exhibited severe susceptibility to Yersinia, characterized by defective IL-12, IFN-gamma, and IL-4 production, and impaired granuloma formation.
• Administration of rIL-12 induced IFN-gamma and improved resistance, while rIL-18 reduced bacterial burden without significantly enhancing IFN-gamma.
• Neither rIL-12 nor rIL-18 fully restored the impaired immune response in ICSBP(-/-) mice.

Conclusions:

• The transcription factor ICSBP is essential for effective host immune defense against Yersinia enterocolitica infection.
• Targeted cytokine therapy can partially ameliorate bacterial infections in immune-deficient hosts, but complete restoration of immunity remains challenging.