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Human gene variants linked to enhanced NLRP3 activity limit intramacrophage growth of Mycobacterium tuberculosis

Daniel Eklund1, Amanda Welin, Henrik Andersson

  • 1Division of Microbiology and Molecular Medicine.

The Journal of Infectious Diseases
|October 26, 2013
PubMed

Insights

Gain-of-function variants in NLRP3 and CARD8 inflammasome genes offer protection against tuberculosis. These genetic variations in macrophages enhance control of Mycobacterium tuberculosis bacterial growth, suggesting a host-protective role.

Area of Science:

  • Immunology
  • Infectious Diseases
  • Genetics

Background:

  • The NLRP3 inflammasome and interleukin 1β generation are crucial in macrophage immune responses to various stimuli.
  • Inflammasome components, including NLRP3 and CARD8, are implicated in inflammatory disorders through genetic variations.
  • Mycobacterium tuberculosis infection poses a significant global health challenge, necessitating a deeper understanding of host-pathogen interactions.

Purpose of the Study:

  • To investigate the role of gain-of-function gene variants in inflammasome components (NLRP3 and CARD8) during Mycobacterium tuberculosis infection.
  • To determine if specific genetic variants associated with inflammatory disorders confer a protective effect against tuberculosis in human macrophages.

Main Methods:

  • Isolation of primary human macrophages from individuals with known genetic variants in NLRP3 and CARD8.
  • Infection of these isolated macrophages with virulent strains of Mycobacterium tuberculosis.
  • Assessment of bacterial growth control within macrophages harboring specific inflammasome gene variants.

Main Results:

  • Gain-of-function variants in NLRP3 and CARD8, typically linked to inflammatory conditions, were found to have a host-protective role during M. tuberculosis infection.
  • Macrophages from patients and healthy donors carrying combined NLRP3 and CARD8 genetic variants demonstrated significantly increased control of bacterial growth.
  • These findings highlight a novel protective mechanism against mycobacterial infection mediated by specific inflammasome gene variants.

Conclusions:

  • Genetic variants in NLRP3 and CARD8, previously associated with inflammatory disorders, confer a protective advantage against Mycobacterium tuberculosis infection.
  • Targeting or understanding the function of these inflammasome variants could offer new therapeutic strategies for tuberculosis.
  • The study underscores the complex, context-dependent role of inflammasomes in host defense against bacterial pathogens.
Keywords:
C10XCARD8IL-1βNLRP3Q705Khuman macrophageinflammasomemycobacteriatuberculosis

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