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Updated: Sep 19, 2025

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TAK1 inhibition activates pore-forming proteins to block intracellular bacterial growth through modulating

Wilfred López-Pérez1, Roland E González-Calderón1, Kazuhito Sai1

  • 1Department of Biological Sciences and Toxicology Program, North Carolina State University, Raleigh, NC, USA.

Cell Death & Disease
|June 18, 2025
PubMed

Insights

Mitogen-activated protein kinase kinase kinase 7 (MAP3K7) inhibition triggers cell death pathways that enhance mitochondrial ROS production. This boosts host defense against intracellular bacteria by targeting MLKL and gasdermins.

Area of Science:

  • Immunology
  • Cell Biology
  • Microbiology

Background:

  • Mitogen-activated protein kinase kinase kinase 7 (MAP3K7), also known as TAK1, is crucial for inflammatory gene expression in host defense.
  • Intracellular bacteria target TAK1 to suppress host inflammatory responses.
  • TAK1 inhibition activates alternative cell death pathways, including apoptosis, pyroptosis, and necroptosis.

Purpose of the Study:

  • To investigate the role of TAK1 inhibition-induced cell death pathways in host defense against intracellular bacteria.
  • To determine the impact of TAK1 inhibition on mitochondrial reactive oxygen species (ROS) production.
  • To elucidate the function of mixed lineage kinase-like (MLKL) and gasdermins in TAK1 inhibition-mediated host defense.

Main Methods:

  • Utilized cell culture models to study TAK1 inhibition and its downstream effects.
  • Measured mitochondrial ROS production following TAK1 inhibition.
  • Employed genetic ablation of MLKL and gasdermins to assess their role in host defense.
  • Quantified intracellular bacterial colonization levels.

Main Results:

  • TAK1 inhibition induced caspase 8-dependent apoptosis, pyroptosis, and RIPK3-dependent necroptosis.
  • These cell death pathways led to the translocation of MLKL and gasdermins to mitochondria, increasing mitochondrial ROS.
  • Ablation of MLKL and gasdermins reduced ROS elevation and worsened bacterial colonization.
  • Host cell death pathways, modulated by TAK1 inhibition, contribute to controlling intracellular pathogen burden.

Conclusions:

  • TAK1 inhibition activates cell death pathways that enhance mitochondrial ROS production as an alternative host defense mechanism.
  • MLKL and gasdermins play a critical role in this ROS-mediated defense against intracellular bacteria.
  • Targeting TAK1 and its downstream effectors offers a potential strategy for combating bacterial infections.

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