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| Luteolin a Flavonoid found in celery, parsley, broccoli, onion leaves, carrots, peppers, cabbages, apple skins, and chrysanthemum flowers. -MDR1 expression, MMP-9, IGF-1 and Epithelial to mesenchymal transition. Luteolin — a naturally occurring polyhydroxylated flavone (3′,4′,5,7-tetrahydroxyflavone) found in celery, parsley, peppers, broccoli and numerous medicinal plants. It is a dietary phytochemical and experimental small-molecule anticancer/anti-inflammatory agent rather than an approved anticancer drug. Standard abbreviation: LUT or Lut. Luteolin occurs as the free aglycone and as plant glycosides; after oral administration, circulating luteolin is dominated by glucuronide and sulfate conjugates rather than free aglycone. Its cancer pharmacology is pleiotropic and strongly model-dependent, with particularly recurrent effects on PI3K/AKT/mTOR, NF-κB, STAT3, redox regulation, mitochondrial apoptosis, EMT/invasion and cell-cycle control. Primary mechanisms (ranked):
Bioavailability / PK relevance: Oral luteolin has poor aqueous solubility and unfavorable systemic availability of unconjugated aglycone. It is absorbed from the intestine but undergoes extensive intestinal and hepatic glucuronidation and sulfation. Animal studies report low absolute bioavailability of free luteolin, commonly in the low-single-digit to low-tens percentage range depending on formulation and analytical definition. Nanoemulsions, lipid/phospholipid systems, cyclodextrins, nanoparticles and other delivery systems can substantially improve exposure experimentally. Luteolin and particularly some circulating conjugates can interact with OATP1B1/OATP2B1 transporters; in-vitro CYP inhibition has also been reported, making pharmacokinetic drug interactions plausible at sufficiently high exposure. In-vitro vs systemic exposure relevance: Many anticancer experiments use approximately 10–100 µM luteolin, often 20–50 µM or higher. These concentrations generally exceed sustained concentrations of free luteolin expected after conventional oral dietary or supplemental dosing because extensive conjugation limits circulating aglycone. Consequently, direct translation of many cell-culture IC50 values to standard oral supplementation is weak. Local gastrointestinal exposure, metabolites, tissue deconjugation and optimized formulations may partly alter this limitation. Clinical evidence status: Predominantly preclinical, but no longer exclusively preclinical. A 2025 single-arm phase I study administered luteolin 50 mg/day for six months to five men with localized prostate cancer undergoing active surveillance; no treatment-related adverse events were reported, but the study was far too small and uncontrolled to establish anticancer efficacy. A larger phase II single-arm multicenter Japanese study of 50 mg/day for one year is currently recruiting with a planned enrollment of 40 patients. Luteolin is therefore best categorized as early-human/phase I–II investigational evidence, not established cancer therapy. Preclinical evidence for chemotherapy and radiotherapy sensitization is substantial but remains cancer-, drug- and genotype-dependent. -Note half-life 2–3 hours BioAv low, but could be improved with Res, or blend of castor oil, kolliphor and polyethylene glycol Pathways: - induce ROS production in cancer cell but a few reports of reduction. Always seems to reduce ROS in normal cells. - ROS↑ related: MMP↓(ΔΨm), ER Stress↑, UPR↑, GRP78↑, Ca+2↑, Cyt‑c↑, Caspases↑, DNA damage↑, cl-PARP↑, HSP↓ - Lowers AntiOxidant defense in Cancer Cells: NRF2↓, SOD↓, GSH↓ Catalase↓ HO1↓ GPx↓ - Raises AntiOxidant defense in Normal Cells: ROS↓, NRF2↑, SOD↑, GSH↑, Catalase↑, - lowers Inflammation : NF-kB↓, COX2↓, p38↓, Pro-Inflammatory Cytokines : IL-1β↓, TNF-α↓, IL-6↓, - inhibit Growth/Metastases : TumMeta↓, TumCG↓, EMT↓, MMP2↓, MMP9↓, TIMP2, IGF-1↓, VEGF↓, FAK↓, RhoA↓, NF-κB↓, CXCR4↓, ERK↓ - reactivate genes thereby inhibiting cancer cell growth : HDAC↓, DNMT1↓, DNMT3A↓, EZH2↓, P53↑, HSP↓, - cause Cell cycle arrest : TumCCA↑, cyclin D1↓, cyclin E↓, CDK2↓, CDK4↓, CDK6↓, - inhibits Migration/Invasion : TumCMig↓, FAK↓, ERK↓, EMT↓, TOP1↓, TET1↓, - inhibits glycolysis and ATP depletion : HIF-1α↓, PKM2↓, cMyc↓, LDHA↓, HK2↓, GRP78↑, - inhibits angiogenesis↓ : VEGF↓, HIF-1α↓, Notch↓, PDGF↓, EGFR↓, Integrins↓, - Others: PI3K↓, AKT↓, STAT↓, Wnt↓, β-catenin↓, AMPK, ERK↓, JNK, TrxR**, - Shown to modulate the nuclear translocation of SREBP-2 (related to cholesterol). - Synergies: chemo-sensitization, chemoProtective, RadioSensitizer, Others(review target notes), Neuroprotective, Renoprotection, Hepatoprotective, CardioProtective, - Selectivity: Cancer Cells vs Normal Cells -"Additionally, when reacted with concentrated sulfuric acid, a zinc salt is produced, resulting in a dark red and yellow solution. These color changes serve as a strong basis for the identification of luteolin" Common Dietary and Plant Sources of Luteolin
Luteolin — Cancer Mechanisms
P: 0–30 min R: 30 min–3 hr G: >3 hr Luteolin — Alzheimer’s disease relevance: Luteolin has substantial preclinical neuroprotective evidence and is sufficiently relevant to Alzheimer’s disease to warrant a separate database section. Reported effects include ↓ amyloid-β production/accumulation, ↓ BACE1-associated amyloidogenic processing, ↓ tau hyperphosphorylation, ↓ neuroinflammation, ↓ oxidative stress, ↓ NLRP3/NF-κB signaling and ↑ BDNF/TrkB-associated neuroplasticity. Acetylcholinesterase inhibition has also been reported. However, evidence remains predominantly cellular and animal; convincing disease-modifying clinical evidence in Alzheimer’s disease is absent. Oral bioavailability and blood-brain exposure of free luteolin remain important translational constraints. Clinical evidence status: Preclinical. Contemporary reviews identify Alzheimer’s disease as the neurodegenerative disorder in which luteolin has been studied most extensively, but explicitly note that clinical therapeutic evidence remains deficient. Luteolin — Alzheimer’s Disease Mechanisms
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| (Also known as Hsp32 and HMOX1) HO-1 is the common abbreviation for the protein (heme oxygenase‑1) produced by the HMOX1 gene. HO-1 is an enzyme that plays a crucial role in various cellular processes, including the breakdown of heme, a toxic molecule. Research has shown that HO-1 is involved in the development and progression of cancer. -widely regarded as having antioxidant and cytoprotective effects -The overall activity of HO‑1 helps to reduce the pro‐oxidant load (by degrading free heme, a pro‑oxidant) and to generate molecules (like bilirubin) that can protect cells from oxidative damage Studies have found that HO-1 is overexpressed in various types of cancer, including lung, breast, colon, and prostate cancer. The overexpression of HO-1 in cancer cells can contribute to their survival and proliferation by: Reducing oxidative stress and inflammation Promoting angiogenesis (the formation of new blood vessels) Inhibiting apoptosis (programmed cell death) Enhancing cell migration and invasion When HO-1 is at a normal level, it mainly exerts an antioxidant effect, and when it is excessively elevated, it causes an accumulation of iron ions. A proper cellular level of HMOX1 plays an antioxidative function to protect cells from ROS toxicity. However, its overexpression has pro-oxidant effects to induce ferroptosis of cells, which is dependent on intracellular iron accumulation and increased ROS content upon excessive activation of HMOX1. -Curcumin Activates the Nrf2 pathway leading to HO‑1 induction; known for its anti‑inflammatory and antioxidant effects. -Resveratrol Induces HO‑1 via activation of SIRT1/Nrf2 signaling; exhibits antioxidant and cardioprotective properties. -Quercetin Activates Nrf2 and related antioxidant pathways; contributes to anti‑oxidative and anti‑inflammatory responses. -EGCG Promotes HO‑1 expression through activation of the Nrf2/ARE pathway; also exhibits anti‑inflammatory and anticancer properties. -Sulforaphane One of the most potent natural HO‑1 inducers; triggers Nrf2 nuclear translocation and upregulates a battery of phase II detoxifying enzymes. -Luteolin Induces HO‑1 via Nrf2 activation; may also exert anti‑inflammatory and neuroprotective effects in various cell models. -Apigenin Has been reported to induce HO‑1 expression partly via the MAPK and Nrf2 pathways; also known for anti‑inflammatory and anticancer activities. |
| 2625- | Ba, | LT, | Baicalein and luteolin inhibit ischemia/reperfusion-induced ferroptosis in rat cardiomyocyte |
| - | in-vivo, | Stroke, | NA |
| 8378- | LT, | Luteolin and its derivatives: modulation of epithelial-mesenchymal transition in fibrosis and cancer |
| - | Review, | Var, | NA |
| 8369- | LT, | Luteolin inhibits proliferation of lung cancer A549 cells by increasing ROS production and inhibiting the AKT/mTOR signaling pathway and HO-1 expression |
| - | in-vitro, | Lung, | A549 |
| 8401- | LT, | Multi-Faceted Role of Luteolin in Cancer Metastasis: EMT, Angiogenesis, ECM Degradation and Apoptosis |
| - | Review, | Var, | NA |
| 8394- | LT, | Luteolin prevents THP-1 macrophage pyroptosis by suppressing ROS production via Nrf2 activation |
| - | in-vitro, | Nor, | NA |
| 8390- | LT, | Luteolin in Inflammatory Bowel Disease and Colorectal Cancer: A Disease Continuum Perspective |
| - | Review, | IBD, | NA | - | Review, | CRC, | NA |
| 4292- | LT, | Luteolin for neurodegenerative diseases: a review |
| - | Review, | AD, | NA | - | Review, | Park, | NA | - | Review, | MS, | NA | - | Review, | Stroke, | NA |
| 2907- | LT, | Protective effect of luteolin against oxidative stress‑mediated cell injury via enhancing antioxidant systems |
| - | in-vitro, | Nor, | NA |
| 2589- | LT, | Chemo, | Luteolin Inhibits Breast Cancer Stemness and Enhances Chemosensitivity through the Nrf2-Mediated Pathway |
| - | in-vitro, | BC, | MDA-MB-231 |
| 2588- | LT, | Chemo, | Luteolin sensitizes two oxaliplatin-resistant colorectal cancer cell lines to chemotherapeutic drugs via inhibition of the Nrf2 pathway |
| - | in-vitro, | CRC, | HCT116 |
| 2587- | LT, | Luteolin inhibits Nrf2 leading to negative regulation of the Nrf2/ARE pathway and sensitization of human lung carcinoma A549 cells to therapeutic drugs |
| - | in-vitro, | Lung, | A549 |
| 2921- | LT, | Luteolin as a potential hepatoprotective drug: Molecular mechanisms and treatment strategies |
| - | Review, | Nor, | NA |
| 2927- | LT, | Luteolin Causes 5′CpG Demethylation of the Promoters of TSGs and Modulates the Aberrant Histone Modifications, Restoring the Expression of TSGs in Human Cancer Cells |
| - | in-vitro, | Cerv, | HeLa |
| 2919- | LT, | Luteolin as a potential therapeutic candidate for lung cancer: Emerging preclinical evidence |
| - | Review, | Var, | NA |
| 2915- | LT, | Luteolin promotes apoptotic cell death via upregulation of Nrf2 expression by DNA demethylase and the interaction of Nrf2 with p53 in human colon cancer cells |
| - | in-vitro, | Colon, | HT29 | - | in-vitro, | CRC, | SNU-407 | - | in-vitro, | Nor, | FHC |
| 2914- | LT, | Therapeutic Potential of Luteolin on Cancer |
| - | Review, | Var, | NA |
Query results interpretion may depend on "conditions" listed in the research papers. Such Conditions may include : -low or high Dose -format for product, such as nano of lipid formations -different cell line effects -synergies with other products -if effect was for normal or cancerous cells
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