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Tirap controls Mycobacterium tuberculosis phagosomal acidification.

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Genetic deficiency in TIR-containing adaptor protein (Tirap) enhances resistance to tuberculosis. Tirap prevents phagosomal acidification and rupture, enabling Mycobacterium tuberculosis replication.

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Area of Science:

  • Immunology
  • Microbiology
  • Genetics

Background:

  • Tuberculosis progression is linked to immune imbalance, hindering host control of intracellular bacterial replication.
  • Innate immunity receptors activate signaling pathways involving adaptor proteins like TIR-containing adaptor protein (Tirap).
  • Human resistance to tuberculosis correlates with Tirap loss-of-function.

Purpose of the Study:

  • To investigate the impact of genetic Tirap deficiency on resistance to Mycobacterium tuberculosis (Mtb) infection.
  • To elucidate the molecular mechanisms by which Mtb manipulates innate immunity for survival.

Main Methods:

  • Utilized a mouse model and ex vivo studies to assess Mtb infection in Tirap-deficient and heterozygous mice.
  • Analyzed Mtb replication within Tirap-deficient macrophages.
  • Investigated the role of Tirap in phagosomal acidification and rupture during Mtb infection.
  • Examined the Cish-dependent signaling pathway in Tirap-mediated anti-tuberculosis effects.

Main Results:

  • Tirap heterozygous mice exhibited increased resistance to Mtb infection compared to wild-type littermates.
  • Mycobacteria replication was significantly inhibited in Tirap-deficient macrophages.
  • Mtb infection induced Tirap expression, which was found to prevent phagosomal acidification and rupture.
  • The anti-tuberculosis effect of Tirap was demonstrated to be Cish-dependent.

Conclusions:

  • Genetic deficiency in Tirap confers resistance to Mtb infection by impairing bacterial replication within macrophages.
  • Mtb manipulates Tirap to prevent phagosomal maturation, promoting intracellular survival.
  • The Tirap-Cish signaling pathway is crucial in the host's defense against Mtb.
  • Findings offer insights into host-directed therapeutic strategies for tuberculosis treatment.