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Acidosis potentiates the host proinflammatory interleukin-1β response to Pseudomonas aeruginosa infection

Iviana M Torres1, Yash R Patankar1, Tamer B Shabaneh1

  • 1Department of Microbiology and Immunology, Geisel School of Medicine at Dartmouth, Lebanon, New Hampshire, USA.

Infection and Immunity
|August 27, 2014
PubMed

Insights

Acidic environments amplify Pseudomonas aeruginosa infections by increasing interleukin-1β (IL-1β) production. This study uncovers mechanisms driving this heightened inflammatory response, crucial for understanding infection exacerbation.

Area of Science:

  • Microbiology
  • Immunology
  • Pathophysiology

Background:

  • Bacterial infections, including Pseudomonas aeruginosa, often cause local microenvironment acidification.
  • The impact of acidic conditions on host inflammatory responses to P. aeruginosa is not well understood.

Purpose of the Study:

  • To investigate how an acidic environment influences the host's inflammatory response to P. aeruginosa infection.
  • To elucidate the mechanisms underlying the increased interleukin-1β (IL-1β) production in acidic conditions during P. aeruginosa infection.

Main Methods:

  • Utilized an in vivo peritonitis model in mice.
  • Investigated bacterial type III secretion system and host NLRC4 inflammasome involvement.
  • Assessed pro-IL-1β induction and caspase-1 activity.

Main Results:

  • An acidic microenvironment significantly increases the host's proinflammatory IL-1β response to P. aeruginosa.
  • Synergistic mechanisms include elevated pro-IL-1β induction and enhanced caspase-1 activity.
  • Caspase-1 activation is dependent on bacterial type III secretion and host NLRC4 inflammasome.

Conclusions:

  • Acidic conditions exacerbate P. aeruginosa-induced inflammation by amplifying IL-1β release.
  • Findings reveal novel regulatory pathways for inflammatory responses during infection.
  • Understanding these mechanisms is key for managing infection-associated inflammation.

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