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Immunité et nutrition

NF-kB

NF-kB is a master regulator that switches immune genes on and off based on cellular threats.

Definition

Nuclear factor kappa B is a transcription factor that controls the expression of genes involved in immune response and inflammation, activated by various cellular stressors.

How it works

NF-kB (nuclear factor kappa B) is a critical intracellular signaling pathway that acts as a molecular switch regulating the expression of hundreds of genes involved in immune response, inflammation, and cell survival. When immune cells detect pathogens or damage signals, NF-kB becomes activated, translocates to the nucleus, and turns on genes encoding pro-inflammatory cytokines, adhesion molecules, and other immune mediators. While acute NF-kB activation is essential for fighting infections, chronic activation perpetuates inflammation and is associated with autoimmune diseases, cancer, and metabolic dysfunction. Certain nutrients like polyphenols and omega-3 fatty acids can modulate NF-kB signaling, keeping it responsive but not chronically overactive. This is why dietary patterns are so influential in determining inflammatory status.

Role

Controls the expression of immune and inflammatory genes, determining whether cells mount protective or chronic inflammatory responses.

Examples

  • NF-kB activation by bacterial lipopolysaccharides
  • Inhibition by curcumin from turmeric
  • Modulation by resveratrol from grapes
  • Chronic activation in obesity-related inflammation

Recommendations

Incorporate NF-kB-modulating foods daily, including turmeric, green tea, berries, and fatty fish. Avoid processed foods and excess omega-6 oils that promote NF-kB activation. Combine dietary strategies with regular physical activity and stress management.

Key takeaway

Nutrition directly modulates the NF-kB pathway, making dietary choices powerful regulators of immune gene expression and inflammatory status.

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