Apigenin (API)

Apigenin is a widely distributed dietary flavonoid, specifically a flavone, found in high concentrations in plants such as parsley, celery, and chamomile (PubMed, PubChem). While sometimes colloquially referred to as a target in nutritional research, Apigenin is strictly a bioactive small molecule (ligand) rather than a therapeutic target protein like a receptor or enzyme (NIH). It interacts with multiple biological targets to exert potent antioxidant, anti-inflammatory, and anti-tumor effects. Apigenin is particularly noted for its ability to induce apoptosis and cell cycle arrest in various cancer cell lines by inhibiting the PI3K/Akt/mTOR pathway and the transcription factor NF-κB (PubMed, PMC6470295). Additionally, it acts as a ligand for the benzodiazepine binding site of GABA-A receptors, which contributes to its therapeutic use as a mild sedative and anxiolytic agent (PubMed Central). Despite its broad pharmacological potential, Apigenin faces challenges in clinical development due to its low aqueous solubility and potential to interfere with drug-metabolizing enzymes such as Cytochrome P450 (PubChem).

Other names

4',5,7-TrihydroxyflavoneChamomile flavonoid5,7-Dihydroxy-2-(4-hydroxyphenyl)-4H-chromen-4-one5,7-Dihydroxy-2-(4-hydroxyphenyl)-4H-1-benzopyran-4-one

Apigenin acts as a multi-target modulator; it binds to the benzodiazepine site of GABA-A receptors to exert sedative effects (PubMed Central), inhibits the enzyme aromatase (CYP19A1) (PubChem), and suppresses pro-survival signaling pathways such as PI3K/Akt/mTOR and NF-κB to induce apoptosis and cell cycle arrest in cancer cells (PubMed). It also modulates MAPK pathways and inhibits several protein kinases like Casein Kinase 2 (CK2) (NIH).