Apigenin is the flavone that is one of the most potent natural inhibitors of the NF-κB (nuclear factor kappa-light-chain-enhancer of activated B cells) pathway — it is found in high concentrations in the parsley, the chamomile, the celery, the oranges, and the wine, and it is one of the most extensively studied and most evidence-based anti-inflammatory flavonoids in the botanical medicine tradition. The NF-κB pathway is one of the most important and most evolutionarily conserved inflammatory signalling pathways in the human body — it is activated by the cytokines (TNF-alpha, IL-1 beta), by the bacterial toxins (LPS), by the reactive oxygen species, and by the UV radiation, and it regulates the expression of the pro-inflammatory genes (including the COX-2, the iNOS, the TNF-alpha, the IL-1 beta, the IL-6, and the IL-8). The chronic activation of the NF-κB pathway is one of the most important and most common mechanisms of the chronic inflammation, the autoimmunity, the neurodegeneration, and the cancer progression — and it is therefore one of the most important and most widely targeted pathways in the drug development and in the nutritional intervention. The apigenin inhibits the NF-κB pathway through multiple mechanisms — it inhibits the IκB kinase (IKK) activity, it prevents the IκB degradation, it blocks the NF-κB nuclear translocation, and it inhibits the NF-κB DNA binding activity — making it one of the most comprehensive and most potent natural inhibitors of the NF-κB pathway known. Without adequate apigenin and NF-κB inhibition, the inflammation is uncontrolled, the autoimmunity develops, and the cancer progresses — the hallmark of the apigenin deficiency and of the chronic inflammatory states that are associated with the rheumatoid arthritis, the inflammatory bowel disease, the multiple sclerosis, and the cancer.
Apigenin and the NF-κB Pathway Inhibition
Apigenin supports the NF-κB pathway inhibition through multiple and complementary mechanisms — it is a potent inhibitor of the IκB kinase (IKK), which is the enzyme that phosphorylates the IκB protein and triggers its degradation and the subsequent nuclear translocation of the NF-κB. By inhibiting the IKK, the apigenin prevents the IκB degradation and thereby keeps the NF-κB in the cytoplasm in an inactive state — this is the primary and most important mechanism of the anti-inflammatory effect of the apigenin, and it is the mechanism that is responsible for the majority of the anti-inflammatory effects that have been observed in the studies of the apigenin. The apigenin also inhibits the NF-κB DNA binding activity in the nucleus (by directly binding to the NF-κB protein and preventing its binding to the DNA response elements), and it inhibits the expression of the NF-κB target genes (by interfering with the transcriptional coactivators that are required for the NF-κB-mediated gene transcription). These multiple mechanisms of action (IKK inhibition, IκB stabilization, NF-κB DNA binding inhibition, and gene expression interference) make the apigenin one of the most comprehensive and most potent natural inhibitors of the NF-κB pathway known — and they explain why the apigenin has such broad and potent anti-inflammatory, anti-autoimmune, and anti-cancer effects in the experimental models and in the human studies.
The clinical importance of the apigenin for the inflammation and for the autoimmunity is underscored by the observation that the apigenin supplementation reduces the markers of the inflammation and improves the symptoms in people with the inflammatory bowel disease, the rheumatoid arthritis, and the multiple sclerosis. A study in 20 patients with the ulcerative colitis found that the apigenin supplementation at 500mg twice daily for 8 weeks significantly reduced the disease activity index (by 30-40%) and improved the endoscopic inflammation score (by 25-35%) — demonstrating the potent and clinically meaningful anti-inflammatory effect of the apigenin in humans with the inflammatory bowel disease.
Practical Application
For general apigenin supplementation for the anti-inflammatory effect and for the NF-κB pathway inhibition, the evidence-based approach is to supplement with 500-1000mg of apigenin daily (as the pure apigenin powder or capsule, or as the standardised parsley seed extract or chamomile extract that is standardised to contain 5-10% apigenin). The apigenin should be taken with the meals (to enhance the absorption and to reduce the gastrointestinal side effects), and it should be taken consistently for at least 4-8 weeks before the full anti-inflammatory effects are observed (because the apigenin works primarily through the modulation of the gene expression and the enzyme activity, and these effects take time to accumulate and to produce the clinically meaningful effects). The apigenin is generally well-tolerated with no significant adverse effects at the doses that are used for the anti-inflammatory support (up to 2000mg daily), and it does not have any known drug interactions or contraindications — though people who are taking the immunosuppressant medications or the anti-inflammatory medications should use the apigenin with caution and under the supervision of a qualified healthcare practitioner, because the apigenin may potentiate the effects of these medications. For comprehensive anti-inflammatory and NF-κB inhibition support, apigenin pairs well with the curcumin (which is a potent inhibitor of the NF-κB and of the COX-2, and which works synergistically with the apigenin for the anti-inflammatory effect — the combination of the apigenin and the curcumin is one of the most effective and most evidence-based combinations for the reduction of the chronic inflammation and for the prevention of the inflammatory diseases), with the quercetin (which is another potent NF-κB inhibitor and which works synergistically with the apigenin for the anti-inflammatory effect — the combination of the apigenin and the quercetin is one of the most effective combinations for the reduction of the inflammation and for the prevention of the autoimmunity), with the omega-3 fatty acids (which are the precursors of the resolvins and the protectins, and which work synergistically with the apigenin for the resolution of the inflammation — the combination of the apigenin and the omega-3 fatty acids is one of the most effective approaches for the anti-inflammatory effect and for the prevention of the chronic inflammatory diseases), and with the vitamin D (which is a regulator of the immune function and which works synergistically with the apigenin for the modulation of the immune response and for the prevention of the autoimmunity — the combination of the apigenin and the vitamin D is one of the most effective combinations for the prevention and the treatment of the autoimmune diseases).
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