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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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| Cytochrome c ** The term "release of cytochrome c" ** an increase in level for the cytosol. Small hemeprotein found loosely associated with the inner membrane of the mitochondrion where it plays a critical role in cellular respiration. Cytochrome c is highly water-soluble, unlike other cytochromes. It is capable of undergoing oxidation and reduction as its iron atom converts between the ferrous and ferric forms, but does not bind oxygen. It also plays a major role in cell apoptosis. The term "release of cytochrome c" refers to a critical step in the process of programmed cell death, also known as apoptosis. In its new location—the cytosol—cytochrome c participates in the apoptotic signaling pathway by helping to form the apoptosome, which activates caspases that execute cell death. Cytochrome c is a small protein normally located in the mitochondrial intermembrane space. Its primary role in healthy cells is to participate in the electron transport chain, a process that helps produce energy (ATP) through oxidative phosphorylation. Mitochondrial outer membrane permeability leads to the release of cytochrome c from the mitochondria into the cytosol. The release of cytochrome c is a pivotal event in apoptosis where cytochrome c moves from the mitochondria to the cytosol, initiating a chain reaction that leads to programmed cell death. On the one hand, cytochrome c can promote cancer cell survival and proliferation by regulating the activity of various signaling pathways, such as the PI3K/AKT pathway. This can lead to increased cell growth and resistance to apoptosis, which are hallmarks of cancer. On the other hand, cytochrome c can also induce apoptosis in cancer cells by interacting with other proteins, such as Apaf-1 and caspase-9. This can lead to the activation of the intrinsic apoptotic pathway, which can result in the death of cancer cells. Overexpressed in Breast, Lung, Colon, and Prostrate. Underexpressed in Ovarian, and Pancreatic. |
| 8403- | LT, | Luteolin induces apoptotic cell death via antioxidant activity in human colon cancer cells |
| - | in-vitro, | CRC, | HT-29 |
| 8401- | LT, | Multi-Faceted Role of Luteolin in Cancer Metastasis: EMT, Angiogenesis, ECM Degradation and Apoptosis |
| - | Review, | Var, | NA |
| - | in-vivo, | AD, | NA |
| 2904- | LT, | Luteolin from Purple Perilla mitigates ROS insult particularly in primary neurons |
| - | in-vitro, | Park, | SK-N-SH | - | in-vitro, | AD, | NA |
| 2903- | LT, | Luteolin induces apoptosis by ROS/ER stress and mitochondrial dysfunction in gliomablastoma |
| - | in-vitro, | GBM, | U251 | - | in-vitro, | GBM, | U87MG | - | in-vivo, | NA, | NA |
| 2923- | LT, | Luteolin induces apoptosis through endoplasmic reticulum stress and mitochondrial dysfunction in Neuro-2a mouse neuroblastoma cells |
| - | in-vitro, | neuroblastoma, | NA |
| 2919- | LT, | Luteolin as a potential therapeutic candidate for lung cancer: Emerging preclinical evidence |
| - | Review, | Var, | NA |
| 2916- | LT, | Antioxidative and Anticancer Potential of Luteolin: A Comprehensive Approach Against Wide Range of Human Malignancies |
| - | Review, | Var, | NA | - | Review, | AD, | NA | - | Review, | Park, | NA |
| 2912- | LT, | Luteolin: a flavonoid with a multifaceted anticancer potential |
| - | 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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