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IKK1/2 protect human cells from TNF-mediated RIPK1-dependent apoptosis in an NF-κB-independent manner

Carsten Slotta1, Jonathan Storm2, Nina Pfisterer2

  • 1Department of Cell Biology, University of Bielefeld, Universitaetsstr. 25, 33501 Bielefeld, Germany; Molecular Neurobiology, University of Bielefeld, Universitaetsstr. 25, 33501 Bielefeld, Germany.

Biochimica Et Biophysica Acta. Molecular Cell Research
|April 10, 2018
PubMed

Insights

Tumor cells evade TNF-induced death, hindering cancer therapy. Researchers found inhibiting IKK1/2 sensitizes human cells to TNF-induced death, suggesting IKK1/2 as a promising cancer therapy target.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Cancer Research

Background:

  • Tumor cells evade cell death triggered by Tumor Necrosis Factor (TNF), limiting its therapeutic potential.
  • Understanding TNF-mediated cell death mechanisms is crucial for developing effective cancer therapies.

Purpose of the Study:

  • To investigate the role of IKK1, IKK2, and RELA in TNF-induced cell death in human cells.
  • To identify potential therapeutic targets for sensitizing cancer cells to TNF-induced apoptosis.

Main Methods:

  • Utilized CRISPR/Cas9n gene editing to create human cell lines deficient in IKK1, IKK2, or both (IKK1/2), and RELA.
  • Stimulated cells with TNF and analyzed NF-κB activation, Caspase-3 activation, and Annexin V binding.
  • Investigated the involvement of RIPK1 in TNF-induced cell death pathways.

Main Results:

  • TNF stimulation impaired NF-κB activation in all generated cell lines compared to wild-type.
  • Only IKK1/2-double-deficient cells exhibited significantly increased TNF-induced cell death, confirmed by Caspase-3 activation and Annexin V binding.
  • TNF-induced cell death in IKK1/2-/- cells was RIPK1-dependent and predominantly apoptotic.

Conclusions:

  • The IKK complex (IKK1/2) protects human cells from TNF-induced death independently of NF-κB RelA.
  • IKK1/2 inhibition represents a promising strategy to sensitize cancer cells to TNF-based therapies.
Keywords:
ApoptosisCell deathIKKNF-kappa-BRIPK1Tumor necrosis factor

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