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| Honokiol is a Lignan isolated from bark, seed cones and leaves of trees of Magnolia species. Honokiol was traditionally used for anxiety and stroke treatment, as well as the alleviation of flu symptoms. -considered to have antioxidant properties -low oral bioavailability and difficulty in intravenous administration -the development of various formulations of honokiol, including microemulsion, liposomes, nanoparticles and micelle copolymers have successfully solved the problem of low water solubility. Pathways: -Inhibit NF-κB activation -Downregulate STAT3 signalin -Inhibiting the PI3K/Akt pathway, -Inhibition of mTOR -Influences various MAPK cascades—including ERK, JNK, and p38 -Inhibition of EGFR -Inhibiting Notch pathway (CSCs) -GPx4 inhibit -Can induce ER stress in cancer cells, which contributes to the activation of unfolded protein response (UPR) pathways -Disrupt the mitochondrial membrane potential in cancer cells. -Reported to increase ROS production in cancer cells -Can exhibit antioxidant properties in normal cells. - has some inhibitor activity but Not classified as HDAC inhibitor as weaker and may work more indirectly. - is well-known in the research community for its role in activating SIRT3 -Note half-life 40–60 minutes BioAv Pathways: - induce ROS production in cancer cells, and typically lowers ROS in normal cells - ROS↑ related: MMP↓(ΔΨm), ER Stress↑, GRP78↑, Ca+2↑, Cyt‑c↑, Caspases↑, DNA damage↑, cl-PARP↑, HSP↓ Prx - Raises AntiOxidant defense in Normal Cells: ROS↓, NRF2↑, SOD↑, GSH↑, Catalase↑, - lowers Inflammation : NF-kB↓, COX2↓, Pro-Inflammatory Cytokines : IL-1β↓, TNF-α↓, IL-6↓, - inhibit Growth/Metastases : TumMeta↓, TumCG↓, EMT↓, MMPs↓, MMP2↓, MMP9↓, VEGF↓, ROCK1↓, RhoA↓, NF-κB↓, CXCR4↓, ERK↓ - reactivate genes thereby inhibiting cancer cell growth : HDAC↓, EZH2↓, P53↑, HSP↓, - cause Cell cycle arrest : TumCCA↑, cyclin D1↓, cyclin E↓, CDK2↓, CDK4↓, CDK6↓, - inhibits Migration/Invasion : TumCMig↓, TumCI↓, ERK↓, EMT↓, - inhibits glycolysis and ATP depletion : HIF-1α↓, cMyc↓, GLUT1↓, LDH↓, LDHA↓, HK2↓, PDKs↓, ECAR↓, OXPHOS↓, GRP78↑, GlucoseCon↓ - inhibits angiogenesis↓ : VEGF↓, HIF-1α↓, Notch↓, EGFR↓, - inhibits Cancer Stem Cells : CSC↓, CD133↓, β-catenin↓, sox2↓, nestin↓, OCT4↓, - Others: PI3K↓, AKT↓, JAK↓, 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, RadioProtective, Others(review target notes), Neuroprotective, Cognitive, Renoprotection, Hepatoprotective, CardioProtective, - Selectivity: Cancer Cells vs Normal Cells Honokiol — a small, lipophilic biphenolic neolignan isolated principally from the bark, seed cones, and leaves of Magnolia species, especially Magnolia officinalis. It is a natural-product small molecule rather than a standardized Magnolia extract; the standard abbreviation is HNK. Honokiol crosses biological membranes readily and has documented CNS penetration, but its pharmaceutical development is constrained by extremely poor aqueous solubility, rapid metabolism, and low/variable oral systemic exposure. Cancer research is dominated by cell and animal studies, although an oral Phase I window-of-opportunity study in patients with resectable early-stage non-small-cell lung cancer is now enrolling. Primary mechanisms (ranked):
Bioavailability / PK relevance: Native honokiol is highly lipophilic and poorly water-soluble, limiting conventional oral and intravenous delivery. It undergoes extensive metabolic clearance, including conjugation, and systemic exposure after ordinary oral formulations may be substantially lower than concentrations commonly used experimentally. Liposomes, nanoemulsions, micelles, nanoparticles and other delivery systems can substantially improve solubility and exposure. A validated pharmacokinetic study of injectable liposomal honokiol has been reported, but clinically established human anticancer PK targets have not yet been defined. In-vitro vs systemic exposure relevance: Many anticancer studies use approximately 10–60 µM honokiol, with some models requiring still higher concentrations. These concentrations should not automatically be considered achievable following conventional oral supplementation because oral bioavailability is limited and human tumor exposure has not been established. The current Phase I lung-cancer study is therefore important for defining human tolerability, systemic exposure and pharmacodynamic effects rather than demonstrating established therapeutic efficacy. Clinical evidence status: Predominantly preclinical. Extensive in-vitro and animal anticancer evidence exists across multiple tumor types. Human anticancer efficacy has not been established. A Phase I oral honokiol study in approximately 15 patients with early-stage resectable NSCLC is currently listed by Houston Methodist as enrolling; treatment is given before surgery primarily to determine safety and maximum tolerated dose. Honokiol is not an FDA-approved anticancer drug. Safety / translation: Preclinical toxicology has generally suggested a comparatively broad therapeutic window, but concentrated honokiol should not be assumed equivalent to historical consumption of Magnolia bark preparations. Potential pharmacokinetic interactions, formulation-dependent exposure, and insufficient controlled human safety data remain major translational limitations. FDA records identify Magnolia cortex extract containing honokiol as having been submitted through the New Dietary Ingredient notification process, but this does not constitute approval of honokiol for cancer treatment. Honokiol Cancer-Relevant Mechanisms
P: 0–30 min R: 30 min–3 hr G: >3 hr Honokiol and Alzheimer’s disease: Honokiol has meaningful but entirely preclinical relevance to Alzheimer’s disease and related neurodegeneration. Its lipophilicity permits CNS penetration, and experimental studies indicate reductions in oxidative stress, neuroinflammation, excitotoxicity and Aβ-associated toxicity together with preservation of mitochondrial function. SIRT3, NRF2, PPAR/PGC-1α signaling and restoration of microglial metabolic competence are among the more plausible mechanistic axes. No convincing clinical evidence currently establishes honokiol as an AD treatment. Evidence level: Preclinical only. Cell and animal studies support neuroprotective and cognition-related effects, but human AD efficacy, dose-response relationships and long-term neurological safety have not been demonstrated. Honokiol Alzheimer’s-Relevant Mechanisms
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| Hypoxia-Inducible-Factor 1A (HIF1A gene, HIF1α, HIF-1α protein product) -Dominantly expressed under hypoxia(low oxygen levels) in solid tumor cells -HIF1A induces the expression of vascular endothelial growth factor (VEGF) -High HIF-1α expression is associated with Poor prognosis -Low HIF-1α expression is associated with Better prognosis -Functionally, HIF-1α is reported to regulate glycolysis, whilst HIF-2α regulates genes associated with lipoprotein metabolism. -Cancer cells produce HIF in response to hypoxia in order to generate more VEGF that promote angiogenesis Key mediators of aerobic glycolysis regulated by HIF-1α. -GLUT-1 → regulation of the flux of glucose into cells. -HK2 → catalysis of the first step of glucose metabolism. -PKM2 → regulation of rate-limiting step of glycolysis. -Phosphorylation of PDH complex by PDK → blockage of OXPHOS and promotion of aerobic glycolysis. -LDH (LDHA): Rapid ATP production, conversion of pyruvate to lactate; HIF-1α Inhibitors: -Curcumin: disruption of signaling pathways that stabilize HIF-1α (ie downregulate). -Resveratrol: downregulate HIF-1α protein accumulation under hypoxic conditions. -EGCG: modulation of upstream signaling pathways, leading to decreased HIF-1α activity. -Emodin: reduce HIF-1α expression. (under hypoxia). -Apigenin: inhibit HIF-1α accumulation. |
| 2896- | HNK, | Honokiol inhibits hypoxia-inducible factor-1 pathway |
| - | in-vivo, | Colon, | CT26 |
| 2900- | HNK, | The Role and Therapeutic Perspectives of Sirtuin 3 in Cancer Metabolism Reprogramming, Metastasis, and Chemoresistance |
| - | Review, | Var, | NA |
| 2894- | HNK, | Pharmacological features, health benefits and clinical implications of honokiol |
| - | Review, | Var, | NA | - | Review, | AD, | NA |
| 2892- | HNK, | Honokiol Induces Apoptosis, G1 Arrest, and Autophagy in KRAS Mutant Lung Cancer Cells |
| - | in-vitro, | Lung, | A549 | - | in-vitro, | Lung, | H460 | - | in-vitro, | Lung, | H385 | - | in-vitro, | Nor, | BEAS-2B |
| 960- | HNK, | Honokiol Inhibits HIF-1α-Mediated Glycolysis to Halt Breast Cancer Growth |
| - | vitro+vivo, | BC, | MCF7 | - | vitro+vivo, | BC, | MDA-MB-231 |
| 2864- | HNK, | Honokiol: A Review of Its Anticancer Potential and Mechanisms |
| - | Review, | Var, | NA |
| 2082- | HNK, | Revealing the role of honokiol in human glioma cells by RNA-seq analysis |
| - | in-vitro, | GBM, | U87MG | - | in-vitro, | GBM, | U251 |
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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