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NF-κB-dependent Signaling Pathway02:26

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The transcription factor NF-κB was discovered in 1986 in the lab of Nobel laureate Professor David Baltimore, for its interaction with the immunoglobulin light chain enhancer in B-cells. After more than three decades of study, it is now evident that NF-κB regulates the expression of over 100 genes. Most of these genes play an essential role in the innate and adaptive immune responses as well as the inflammatory responses of animals.
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Internal cellular stress, such as cellular injury or hypoxia, triggers intrinsic apoptosis. The B-cell lymphoma 2 (Bcl-2) family of proteins are the primary regulators of the intrinsic apoptotic pathway. For example, during DNA damage, checkpoint proteins, such as Ataxia Telangiectasia Mutated (ATM protein) and Checkpoints Factor-2 (Chk2) proteins, are activated. These proteins phosphorylate p53 which further activates pro-apoptotic proteins, such as Bax, Bak, PUMA, and Noxa, and inhibits...
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Mitogen-activated protein kinase, or MAPK pathway, activates three sequential kinases to regulate cellular responses such as proliferation, differentiation, survival, and apoptosis. The canonical MAPK pathway starts with a mitogen or growth factor binding to an RTK. The activated RTKs stimulate Ras, which recruits Raf or MAP3 Kinase (MAPKKK), the first kinase of the MAPK signaling cascade. Raf further phosphorylates and activates MEK or MAP2 Kinases (MAPKK), which in turn phosphorylates MAP...
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Gene transcription is regulated by the synergistic action of several proteins that form a complex at a gene regulatory site. This is observed in eukaryotes, where the regulation of gene expression is a complex process. Regulatory proteins in eukaryotes can broadly be classified into two types – regulators that bind directly to specific DNA sequences and co-regulators that associate with regulatory proteins but cannot directly bind to the DNA. These co-regulators are further divided into...
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NF-κB, an active player in human cancers.

Yifeng Xia1, Shen Shen1, Inder M Verma2

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Nuclear Factor kappa B (NF-κB) signaling drives cancer initiation, progression, and treatment resistance. Targeting this pathway offers therapeutic promise, but requires careful consideration of its diverse biological roles.

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Area of Science:

  • Molecular Biology
  • Cellular Biology
  • Oncology

Background:

  • Nuclear Factor kappa B (NF-κB) is a family of transcription factors regulating cellular processes.
  • NF-κB signaling is implicated in both physiological and pathological conditions, particularly in cancer.

Purpose of the Study:

  • To review the multifaceted role of NF-κB in human cancer.
  • To highlight NF-κB as a potential therapeutic target in oncology.

Main Methods:

  • Literature review and analysis of NF-κB pathway involvement in cancer.
  • Examination of NF-κB's functions in tumor initiation, development, metastasis, and treatment resistance.

Main Results:

  • Constitutive NF-κB activity is common in human cancers, driven by inflammation and oncogenic mutations.
  • NF-κB promotes tumor proliferation, angiogenesis, metastasis, and immune evasion.
  • Suppression of NF-κB leads to tumor regression, validating it as a therapeutic target.

Conclusions:

  • The NF-κB pathway is a critical regulator of cancer progression and a promising target for anti-cancer therapies.
  • Careful selection and evaluation of NF-κB pathway components are essential for designing effective targeted therapies.