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The AIM2 inflammasome is critical for innate immunity to Francisella tularensis

Teresa Fernandes-Alnemri1, Je-Wook Yu, Christine Juliana

  • 1Department of Biochemistry and Molecular Biology, Thomas Jefferson University, Philadelphia, Pennsylvania, USA.

Nature Immunology
|March 31, 2010
PubMed

Insights

The inflammasome sensor AIM2 is crucial for detecting Francisella tularensis, the bacteria causing tularemia. AIM2 deficiency in mice leads to increased susceptibility and mortality from this intracellular pathogen.

Area of Science:

  • Immunology
  • Microbiology
  • Infectious Diseases

Background:

  • Francisella tularensis (F. tularensis) causes tularemia and infects host macrophages.
  • Macrophage infection by F. tularensis triggers proinflammatory cytokine production, including IL-1beta and IL-18.

Purpose of the Study:

  • To elucidate the mechanism by which host macrophages recognize F. tularensis.
  • To determine the role of the inflammasome component AIM2 in the host response to F. tularensis.

Main Methods:

  • Utilized mice deficient in the Absent in Melanoma 2 (AIM2) inflammasome component.
  • Compared susceptibility, mortality, and bacterial burden in AIM2-deficient and wild-type mice infected with F. tularensis.
  • Assessed caspase-1 activation, IL-1beta secretion, and cell death in Aim2(-/-) macrophages.

Main Results:

  • AIM2-deficient mice exhibited extreme susceptibility to F. tularensis, with significantly higher mortality and bacterial load compared to wild-type controls.
  • Absence of AIM2 led to impaired caspase-1 activation, IL-1beta secretion, and cell death in macrophages upon F. tularensis infection or exposure to cytoplasmic DNA.
  • AIM2 was identified as essential for sensing F. tularensis within macrophages.

Conclusions:

  • AIM2 is a critical sensor for F. tularensis infection in host macrophages.
  • Genetic evidence confirms AIM2's vital role in innate immunity against intracellular pathogens like F. tularensis.
  • AIM2 deficiency compromises the host's ability to control F. tularensis, highlighting its importance in host defense.

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