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Scientists discovered a new host defense pathway involving phospholipase C (PLC) and protein kinase D (PKD) that activates TFEB during infection. This conserved signaling pathway is crucial for fighting pathogens like Staphylococcus aureus and Salmonella.

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Area of Science:

  • Immunology
  • Molecular Biology
  • Genetics

Background:

  • Host defense gene transcription mechanisms are not fully understood.
  • The transcription factor TFEB is vital for host defense, but its regulation during infection is unknown.

Purpose of the Study:

  • To elucidate the regulatory mechanisms of TFEB during infection.
  • To identify the signaling pathway that activates TFEB in response to pathogens.

Main Methods:

  • Utilized *C. elegans* as a model organism to identify key genes and pathways.
  • Employed reverse and chemical genetics in *C. elegans* and mouse macrophages.
  • Investigated the roles of phospholipase C (PLC), protein kinase D (PKD), and PKCα.

Main Results:

  • Identified the *dkf-1* gene (encoding PKD) as essential for TFEB activation in *Staphylococcus aureus*-infected nematodes.
  • Demonstrated that pharmacological activation of PKD can activate TFEB.
  • Found that PLC (*plc-1*) acts upstream of PKD, downstream of Gαq (*egl-30*), in the TFEB activation pathway.
  • Discovered a conserved PLC-PKD-TFEB signaling axis in *Salmonella*-infected mouse macrophages, requiring PKCα.

Conclusions:

  • Revealed a novel, evolutionarily conserved host defense signaling pathway (PLC-PKD-TFEB).
  • This pathway is critical for activating TFEB-mediated immune responses against bacterial infections.
  • The findings provide new insights into innate immunity and potential therapeutic targets.