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Intestinal Acid Sphingomyelinase Protects From Severe Pathogen-Driven Colitis.

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Acid sphingomyelinase (Asm) is crucial for controlling gut inflammation. Its deficiency worsens susceptibility to Citrobacter rodentium infection, leading to severe colitis and systemic bacterial spread.

Keywords:
Citrobacter rodentiumTh1Th17acid sphingomyelinaseamitriptylinecolitis

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Area of Science:

  • Gastroenterology
  • Immunology
  • Microbiology

Background:

  • Gastrointestinal inflammatory diseases are a growing global concern.
  • Ulcerative colitis pathogenesis is linked to sphingolipid metabolism dysregulation.
  • Citrobacter rodentium infection models colonic inflammation similar to ulcerative colitis.

Purpose of the Study:

  • To investigate the role of acid sphingomyelinase (Asm) in Citrobacter rodentium-induced colitis.
  • To understand Asm's impact on mucosal immunity and inflammatory responses.

Main Methods:

  • Utilized Asm-deficient mice and Asm inhibitors.
  • Infected mice with the enteric pathogen Citrobacter rodentium.
  • Assessed bacterial load, systemic spread, inflammatory T cell responses, and colonic pathology.

Main Results:

  • Asm deficiency or inhibition increased susceptibility to C. rodentium infection.
  • Mice lacking Asm showed higher bacterial levels and systemic spread.
  • Asm-deficient mice exhibited uncontrolled T helper 1 (Th1) and T helper 17 (Th17) responses, exacerbating colonic pathology.

Conclusions:

  • Acid sphingomyelinase (Asm) is essential for regulating mucosal immunity against C. rodentium.
  • Asm plays a critical role in controlling inflammatory responses during enteric bacterial infections.