NF-kB: Nuclear Factor kappa B — The Orchestrator of Inflammation

NF-kB: Nuclear Factor kappa B

NF-kB (Nuclear Factor kappa-light-chain-enhancer of activated B cells) is a transcription factor present in almost all cells of our body. It is the central orchestrator of chronic inflammation. When activated, it triggers the expression of hundreds of pro-inflammatory genes. Most modern chronic diseases (atherosclerosis, T2 diabetes, cancer, autoimmune diseases) involve chronically activated NF-kB.

Discovery and History

NF-kB was discovered in 1986 by David Baltimore and Ranjan Sen. Today, it is one of the most studied transcription factors in cell biology.

Structure and Family

NF-kB is actually a family of 5 proteins:

  • RelA (p65) — the main effector
  • RelB
  • c-Rel
  • p50 (NF-kB1)
  • p52 (NF-kB2)

The RelA/p50 heterodimer is the most common form. Inactive at rest, sequestered in the cytoplasm by IκB.

Canonical Activation Pathway

  1. Pro-inflammatory stimulus (TNF, IL-1, LPS, ROS, etc.)
  2. Activation of the IKK complex (IκB kinase)
  3. IKK phosphorylates IκBα
  4. Phosphorylated IκBα is ubiquitinated and degraded by the proteasome
  5. Released NF-kB → nuclear translocation
  6. Binding to κB elements → transcription of target genes

Pro-inflammatory Target Genes

Category Target Genes
Cytokines TNF-α, IL-1β, IL-6, IL-8, IL-18
Enzymes COX-2, iNOS, MMPs
Adhesion VCAM-1, ICAM-1, E-selectin
Chemokines CCL2, CCL5, CXCL1
Anti-apoptotic Bcl-xL, c-FLIP, XIAP

Chronic NF-kB = Chronic Diseases

When acutely activated, NF-kB is protective (immune response). When chronically activated, it is pathogenic. Pathologies involving hyperactivated NF-kB:

  • Atherosclerosis and cardiovascular diseases
  • Type 2 diabetes (insulin resistance)
  • Cancer (proliferation + resistance to apoptosis)
  • Rheumatoid arthritis and other autoimmune diseases
  • Inflammatory bowel diseases (Crohn's, UC)
  • Asthma
  • Neurodegenerative diseases (Alzheimer's, Parkinson's)
  • Obesity and metabolic syndrome
  • Sarcopenia

Documented Natural NF-kB Inhibitors

  • [6]-Gingerol (ginger) — stabilizes IκBα
  • Curcumin (turmeric) — directly inhibits IKK
  • Quercetin (onions, apples)
  • Resveratrol (grapes, red wine)
  • EGCG (green tea)
  • Boswellia serrata (frankincense)

NF-kB and INTI

INTI was designed to target NF-kB through several complementary mechanisms: [6]-gingerol stabilizes IκBα, curcumin (made bioavailable by piperine) directly inhibits IKK, and the absence of sugar prevents NF-kB activation by hyperglycemia.

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