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Maximal adamantyl-substituted retinoid-related molecule-induced apoptosis requires NF-κB noncanonical and canonical

L Farhana1, M I Dawson, F Murshed

  • 1Deparment of Medicine, John D Dingell VA Medical Center, Wayne State University, Detroit, MI, USA. Joseph.Fontana@va.gov

Cell Death and Differentiation
|July 31, 2010
PubMed

Insights

The drug 3-Cl-AHPC triggers apoptosis by activating both canonical and noncanonical NF-κB pathways, requiring IKKα and IKKβ kinases for its effects in cancer cells.

Area of Science:

  • Molecular Biology
  • Cellular Biology
  • Cancer Research

Background:

  • Nuclear factor kappa B (NF-κB) transcription factors regulate cell survival and apoptosis.
  • Previous studies indicated that 4-(3-Cl-(1-adamantyl)-4-hydroxyphenyl)-3-chlorocinnamic acid (3-Cl-AHPC) induces apoptosis and requires NF-κB activation in carcinoma cells.

Purpose of the Study:

  • To investigate the role of NF-κB canonical and noncanonical pathways in 3-Cl-AHPC-mediated apoptosis.
  • To elucidate the specific mechanisms of NF-κB activation by 3-Cl-AHPC.

Main Methods:

  • Activation of IκB kinase (IKK)α and IKKβ by 3-Cl-AHPC in human breast carcinoma and leukemia cell lines.
  • Utilizing knockout and knockdown models (mouse embryonic fibroblast and MDA-MB-468 cells) to assess the necessity of IKKα and IKKβ.
  • Analyzing the noncanonical pathway activation, including caspase-mediated decrease of c-IAP1, NIK stabilization, and TRAF3 binding.

Main Results:

  • 3-Cl-AHPC activated both canonical and noncanonical NF-κB pathways, with canonical pathway activation within 6 hours and noncanonical pathway activation within 48 hours.
  • Inhibition of IKKα or IKKβ expression blocked 3-Cl-AHPC-mediated apoptosis, confirming their essential role.
  • Noncanonical pathway activation involved caspase-mediated degradation of c-IAP1, leading to NIK stabilization, TRAF3 binding, IKKα activation, and increased RelB/p52 levels.
  • Cdc37 expression was essential for 3-Cl-AHPC-induced IKKα and IKKβ activation.

Conclusions:

  • Both canonical and noncanonical NF-κB pathways are crucial for maximal 3-Cl-AHPC-induced apoptosis.
  • The study reveals a detailed mechanism of NF-κB activation by 3-Cl-AHPC, involving IKK kinases, c-IAP1, NIK, and Cdc37.
  • These findings highlight the significant role of NF-κB signaling in the apoptotic response to 3-Cl-AHPC, offering potential therapeutic insights.

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