Quercetin / Bcl-xL Cancer Research Results

QC, Quercetin: Click to Expand ⟱
Features:
Plant pigment (flavonoid) found in red wine, onions, green tea, apples and berries.
Quercetin is thought to contribute to anticancer effects through several mechanisms:
-Antioxidant Activity:
-Induction of Apoptosis:modify Bax:Bcl-2 ratio
-Anti-inflammatory Effects:
-Cell Cycle Arrest:
-Inhibition of Angiogenesis and Metastasis: (VEGF)

Cellular Pathways:
-PI3K/Akt/mTOR Pathway: central to cell proliferation, survival, and metabolism.
-MAPK/ERK Pathway: influencing cell proliferation, differentiation, and apoptosis.
-NF-κB Pathway: downregulate NF-κB
-JAK/STAT Pathway: interfere with the activation of STAT3
-Apoptotic Pathways: intrinsic (mitochondrial) and extrinsic (death receptor-mediated) pathways

Quercetin has been used at doses around 500–1000 mg per day
Quercetin’s bioavailability from foods or standard supplements can be low.
EMIQ bioavialability is about 3X that of Quercetin (Example Natural Factors brand)
Isoquercitrin is high bioaviability and efficiacy but at this time does not seem available as supplement.

-Note half-life 11 to 28 hours.
BioAv low 1-10%, poor water-solubility, consuming with fat may improve bioavialability. also piperine or VitC.
Pathways:
- induce ROS production in cancer cells (higher dose). Typicallys Lowers ROS in normal cells(unless it is high dose?)or depends on Redox status?. "quercetin paradox"
- ROS↑ related: MMP↓(ΔΨm), ER Stress↑, UPR↑, GRP78↑, Ca+2↑, Cyt‑c↑, Caspases↑, DNA damage↑, cl-PARP↑, HSP↓, Prx,
- Confusing info about Lowering AntiOxidant defense in Cancer Cells: NRF2↓(some contrary), TrxR↓**, SOD↓(contrary), GSH↓ Catalase↓(contrary), HO1↓(some contrary), GPx↓(some contrary)
- Raises AntiOxidant defense in Normal Cells: ROS↓, NRF2↑, SOD↑, GSH↑, Catalase↑,
- lowers Inflammation : NF-kB↓, COX2↓, p38↓, Pro-Inflammatory Cytokines : NLRP3↓, IL-1β↓, TNF-α↓, IL-6↓, IL-8↓
- inhibit Growth/Metastases : TumMeta↓, TumCG↓, EMT↓, MMPs↓, MMP2↓, MMP9↓, TIMP2, IGF-1↓, uPA↓, VEGF↓, ROCK1↓, FAK↓, NF-κB↓, CXCR4↓, SDF1↓, TGF-β↓, α-SMA↓, ERK↓
- reactivate genes thereby inhibiting cancer cell growth : HDAC↓, DNMTs↓, EZH2↓, P53↑, HSP↓, Sp proteins↓, TET↑
- cause Cell cycle arrest : TumCCA↑, cyclin D1↓, cyclin E↓, CDK2↓, CDK4↓, CDK6↓,
- inhibits Migration/Invasion : TumCMig↓, TumCI↓, TNF-α↓, FAK↓, ERK↓, EMT↓, TOP1↓, TET1,
- inhibits glycolysis and ATP depletion : HIF-1α↓, PKM2↓, cMyc↓, GLUT1↓, LDH↓, LDHA↓, HK2↓, PFKs↓, PDKs↓, ECAR↓, OXPHOS↓, GRP78↑, GlucoseCon↓
- inhibits angiogenesis↓ : VEGF↓, HIF-1α↓, Notch↓, FGF↓, PDGF↓, EGFR↓,
- some indication of inhibiting Cancer Stem Cells : CSC↓, CK2↓, Hh↓, CD24↓, β-catenin↓, Notch2↓,
- Others: PI3K↓, AKT↓, JAK↓, STAT↓, Wnt↓, β-catenin↓, AMPK, α↓, ERK↓, JNK, - SREBP (related to cholesterol).
- Synergies: chemo-sensitization, chemoProtective, RadioSensitizer, RadioProtective, Others(review target notes), Neuroprotective, Cognitive, Renoprotection, Hepatoprotective, CardioProtective,

- Selectivity: Cancer Cells vs Normal Cells

Rank Pathway / Axis Cancer Cells Normal Cells Label Primary Interpretation Notes
1 Reactive oxygen species (ROS) ↑ ROS (dose-, metal-, context-dependent) ↓ ROS Conditional Driver Biphasic redox modulation Quercetin exhibits pro-oxidant behavior in cancer cells while protecting normal cells
2 Mitochondrial integrity / intrinsic apoptosis ↓ ΔΨm; ↑ caspase activation ↔ preserved Driver Execution of intrinsic apoptosis Mitochondrial dysfunction is a central apoptosis route in cancer cells
3 PI3K → AKT → mTOR axis ↓ AKT / ↓ mTOR ↔ adaptive suppression Driver Growth and survival inhibition AKT/mTOR suppression is a consistently reported upstream effect in cancer models
4 NF-κB signaling ↓ NF-κB activation ↓ inflammatory NF-κB tone Secondary Reduced survival and inflammatory transcription NF-κB inhibition contributes to chemosensitization and apoptosis susceptibility
5 MAPK signaling (JNK / p38) ↑ JNK / ↑ p38 ↔ minimal Secondary Stress-mediated apoptosis signaling MAPK activation supports apoptosis downstream of redox stress
6 Cell cycle regulation ↑ G1/S or G2/M arrest ↔ largely spared Phenotypic Cytostatic growth control Cell-cycle arrest reflects disruption of growth signaling
7 HIF-1α hypoxia signaling ↓ HIF-1α ↔ minimal Secondary Reduced hypoxia tolerance Quercetin interferes with hypoxia-driven transcriptional programs
8 NRF2 antioxidant response ↑ NRF2 (adaptive, context-dependent) ↑ NRF2 (protective) Adaptive Stress compensation NRF2 induction reflects redox buffering rather than primary cytotoxicity


Bcl-xL, Bcl-xL: Click to Expand ⟱
Source:
Type: pro-survival proteins
The proteins of BCL-2 family are classified into three subgroups, i.e., the anti-apoptotic/pro-survival proteins represented by BCL-2 and BCL-XL.
BCL-XL overexpressing cells exhibited higher tumors sphere formation capacity and expressed higher levels of some stem cell markers, supporting the concept that BCL-XL plays essential roles in the maintenance of cancer stem cell phenotype.
Scientific Papers found: Click to Expand⟱
54- QC,    Quercetin‑3‑methyl ether suppresses human breast cancer stem cell formation by inhibiting the Notch1 and PI3K/Akt signaling pathways
- in-vitro, BC, MCF7
EMT↓, E-cadherin↑, Vim↓, MMP2↓, NOTCH1↓, PI3K/Akt↓, PI3k/Akt/mTOR↓, p‑Akt↓, EZH2↓, H3K27ac↓, TumCCA↑, CSCs↓, CDK1↓, CycB/CCNB1↓, Bcl-xL↓, Bcl-2↓, Nanog↓, H3↓,
84- QC,    Quercetin-induced growth inhibition and cell death in prostatic carcinoma cells (PC-3) are associated with increase in p21 and hypophosphorylated retinoblastoma proteins expression
- in-vitro, Pca, PC3
P21↑, cDC2↓, CDK1↓, CycB/CCNB1↓, Casp3↑, Bcl-2↓, Bcl-xL↓, BAX↑, pRB↓, TumCCA↑, Apoptosis↑,
78- QC,    Effects of quercetin on insulin-like growth factors (IGFs) and their binding protein-3 (IGFBP-3) secretion and induction of apoptosis in human prostate cancer cells
- in-vitro, Pca, PC3
IGF-1↓, IGF-2↓, IGFBP3↑, Bcl-2↓, Bcl-xL↓, Casp3↑, Apoptosis↑, BAX↑, DNAdam↑,
79- QC,    Chemopreventive Effect of Quercetin in MNU and Testosterone Induced Prostate Cancer of Sprague-Dawley Rats
- in-vivo, Pca, NA
GSH↑, SOD↑, Catalase↑, GPx↑, GSR↑, IGF-1R↓, Akt↓, AR↓, TumCP↓, lipid-P↓, H2O2↓, Raf↓, p‑MEK↓, Bcl-2↑, Bcl-xL↑, Casp3↑, Casp8↑, Casp9↑,
83- QC,    Quercetin induces p53-independent apoptosis in human prostate cancer cells by modulating Bcl-2-related proteins: a possible mediation by IGFBP-3
- in-vitro, Pca, PC3
Bcl-2↓, Bcl-xL↓, BAX↑, IGFBP3↑,

Showing Research Papers: 1 to 5 of 5

* indicates research on normal cells as opposed to diseased cells
Total Research Paper Matches: 5

Pathway results for Effect on Cancer / Diseased Cells:


Redox & Oxidative Stress(tgid=1) ⓘ

Catalase↑, 1,   GPx↑, 1,   GSH↑, 1,   GSR↑, 1,   H2O2↓, 1,   lipid-P↓, 1,   SOD↑, 1,  

Mitochondria & Bioenergetics(tgid=3) ⓘ

p‑MEK↓, 1,   Raf↓, 1,  

Core Metabolism/Glycolysis(tgid=4) ⓘ

PI3K/Akt↓, 1,   PI3k/Akt/mTOR↓, 1,  

Cell Death(tgid=5) ⓘ

Akt↓, 1,   p‑Akt↓, 1,   Apoptosis↑, 2,   BAX↑, 3,   Bcl-2↓, 4,   Bcl-2↑, 1,   Bcl-xL↓, 4,   Bcl-xL↑, 1,   Casp3↑, 3,   Casp8↑, 1,   Casp9↑, 1,  

Transcription & Epigenetics(tgid=7) ⓘ

EZH2↓, 1,   H3↓, 1,   pRB↓, 1,  

DNA Damage & Repair(tgid=10) ⓘ

DNAdam↑, 1,  

Cell Cycle & Senescence(tgid=11) ⓘ

CDK1↓, 2,   CycB/CCNB1↓, 2,   P21↑, 1,   TumCCA↑, 2,  

Proliferation, Differentiation & Cell State(tgid=12) ⓘ

cDC2↓, 1,   CSCs↓, 1,   EMT↓, 1,   H3K27ac↓, 1,   IGF-1↓, 1,   IGF-1R↓, 1,   IGF-2↓, 1,   IGFBP3↑, 2,   Nanog↓, 1,   NOTCH1↓, 1,  

Migration(tgid=13) ⓘ

E-cadherin↑, 1,   MMP2↓, 1,   TumCP↓, 1,   Vim↓, 1,  

Hormonal & Nuclear Receptors(tgid=20) ⓘ

AR↓, 1,  

Clinical Biomarkers(tgid=22) ⓘ

AR↓, 1,   EZH2↓, 1,  
Total Targets: 47

Pathway results for Effect on Normal Cells:


Total Targets: 0

Scientific Paper Hit Count for: Bcl-xL, Bcl-xL
5 Quercetin
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

Filter Conditions: Pro/AntiFlg:%  IllCat:%  CanType:%  Cells:%  prod#:140  Target#:28  State#:%  Dir#:%
  wNotes=0  sortOrder:rid,rpid

 

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