Quercetin / ROS 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.

-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↓">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


ROS, Reactive Oxygen Species: Click to Expand ⟱
Source: HalifaxProj (inhibit)
Type:
Reactive oxygen species (ROS) are highly reactive molecules that contain oxygen and can lead to oxidative stress in cells. They play a dual role in cancer biology, acting as both promoters and suppressors of cancer.
ROS can cause oxidative damage to DNA, leading to mutations that may contribute to cancer initiation and progression. So normally you want to inhibit ROS to prevent cell mutations.
However excessive ROS can induce apoptosis (programmed cell death) in cancer cells, potentially limiting tumor growth. Chemotherapy typically raises ROS.
-mitochondria is the main source of reactive oxygen species (ROS) (and the ETC is heavily related)

"Reactive oxygen species (ROS) are two electron reduction products of oxygen, including superoxide anion, hydrogen peroxide, hydroxyl radical, lipid peroxides, protein peroxides and peroxides formed in nucleic acids 1. They are maintained in a dynamic balance by a series of reduction-oxidation (redox) reactions in biological systems and act as signaling molecules to drive cellular regulatory pathways."
"During different stages of cancer formation, abnormal ROS levels play paradoxical roles in cell growth and death 8. A physiological concentration of ROS that maintained in equilibrium is necessary for normal cell survival. Ectopic ROS accumulation promotes cell proliferation and consequently induces malignant transformation of normal cells by initiating pathological conversion of physiological signaling networks. Excessive ROS levels lead to cell death by damaging cellular components, including proteins, lipid bilayers, and chromosomes. Therefore, both scavenging abnormally elevated ROS to prevent early neoplasia and facilitating ROS production to specifically kill cancer cells are promising anticancer therapeutic strategies, in spite of their contradictoriness and complexity."
"ROS are the collection of derivatives of molecular oxygen that occur in biology, which can be categorized into two types, free radicals and non-radical species. The non-radical species are hydrogen peroxide (H 2O 2 ), organic hydroperoxides (ROOH), singlet molecular oxygen ( 1 O 2 ), electronically excited carbonyl, ozone (O3 ), hypochlorous acid (HOCl, and hypobromous acid HOBr). Free radical species are super-oxide anion radical (O 2•−), hydroxyl radical (•OH), peroxyl radical (ROO•) and alkoxyl radical (RO•) [130]. Any imbalance of ROS can lead to adverse effects. H2 O 2 and O 2 •− are the main redox signalling agents. The cellular concentration of H2 O 2 is about 10−8 M, which is almost a thousand times more than that of O2 •−".
"Radicals are molecules with an odd number of electrons in the outer shell [393,394]. A pair of radicals can be formed by breaking a chemical bond or electron transfer between two molecules."

Recent investigations have documented that polyphenols with good antioxidant activity may exhibit pro-oxidant activity in the presence of copper ions, which can induce apoptosis in various cancer cell lines but not in normal cells. "We have shown that such cell growth inhibition by polyphenols in cancer cells is reversed by copper-specific sequestering agent neocuproine to a significant extent whereas iron and zinc chelators are relatively ineffective, thus confirming the role of endogenous copper in the cytotoxic action of polyphenols against cancer cells. Therefore, this mechanism of mobilization of endogenous copper." > Ions could be one of the important mechanisms for the cytotoxic action of plant polyphenols against cancer cells and is possibly a common mechanism for all plant polyphenols. In fact, similar results obtained with four different polyphenolic compounds in this study, namely apigenin, luteolin, EGCG, and resveratrol, strengthen this idea.
Interestingly, the normal breast epithelial MCF10A cells have earlier been shown to possess no detectable copper as opposed to breast cancer cells [24], which may explain their resistance to polyphenols apigenin- and luteolin-induced growth inhibition as observed here (Fig. 1). We have earlier proposed [25] that this preferential cytotoxicity of plant polyphenols toward cancer cells is explained by the observation made several years earlier, which showed that copper levels in cancer cells are significantly elevated in various malignancies. Thus, because of higher intracellular copper levels in cancer cells, it may be predicted that the cytotoxic concentrations of polyphenols required would be lower in these cells as compared to normal cells."

Majority of ROS are produced as a by-product of oxidative phosphorylation, high levels of ROS are detected in almost all cancers.
-It is well established that during ER stress, cytosolic calcium released from the ER is taken up by the mitochondrion to stimulate ROS overgeneration and the release of cytochrome c, both of which lead to apoptosis.

Note: Products that may raise ROS can be found using this database, by:
Filtering on the target of ROS, and selecting the Effect Direction of ↑

Targets to raise ROS (to kill cancer cells):
• NADPH oxidases (NOX): NOX enzymes are involved in the production of ROS.
    -Targeting NOX enzymes can increase ROS levels and induce cancer cell death.
    -eNOX2 inhibition leads to a high NADH/NAD⁺ ratio which can lead to increased ROS
• Mitochondrial complex I: Inhibiting can increase ROS production
• P53: Activating p53 can increase ROS levels(by inducing the expression of pro-oxidant genes)
• Nrf2 inhibition: regulates the expression of antioxidant genes. Inhibiting Nrf2 can increase ROS levels
• Glutathione (GSH): an antioxidant. Depleting GSH can increase ROS levels
• Catalase: Catalase converts H2O2 into H2O+O. Inhibiting catalase can increase ROS levels
• SOD1: converts superoxide into hydrogen peroxide. Inhibiting SOD1 can increase ROS levels
• PI3K/AKT pathway: regulates cell survival and metabolism. Inhibiting can increase ROS levels
• HIF-1α inhibition: regulates genes involved in metabolism and angiogenesis. Inhibiting HIF-1α can increase ROS
• Glycolysis: Inhibiting glycolysis can increase ROS levels • Fatty acid oxidation: Cancer cells often rely on fatty acid oxidation for energy production.
-Inhibiting fatty acid oxidation can increase ROS levels
• ER stress: Endoplasmic reticulum (ER) stress can increase ROS levels
• Autophagy: process by which cells recycle damaged organelles and proteins.
-Inhibiting autophagy can increase ROS levels and induce cancer cell death.
• KEAP1/Nrf2 pathway: regulates the expression of antioxidant genes.
    -Inhibiting KEAP1 or activating Nrf2 can increase ROS levels and induce cancer cell death.
• DJ-1: regulates the expression of antioxidant genes. Inhibiting DJ-1 can increase ROS levels
• PARK2: regulates the expression of antioxidant genes. Inhibiting PARK2 can increase ROS levels
• SIRT1 inhibition:regulates the expression of antioxidant genes. Inhibiting SIRT1 can increase ROS levels
• AMPK activation: regulates energy metabolism and can increase ROS levels when activated.
• mTOR inhibition: regulates cell growth and metabolism. Inhibiting mTOR can increase ROS levels
• HSP90 inhibition: regulates protein folding and can increase ROS levels when inhibited.
• Proteasome: degrades damaged proteins. Inhibiting the proteasome can increase ROS levels
• Lipid peroxidation: a process by which lipids are oxidized, leading to the production of ROS.
    -Increasing lipid peroxidation can increase ROS levels
• Ferroptosis: form of cell death that is regulated by iron and lipid peroxidation.
    -Increasing ferroptosis can increase ROS levels
• Mitochondrial permeability transition pore (mPTP): regulates mitochondrial permeability.
    -Opening the mPTP can increase ROS levels
• BCL-2 family proteins: regulate apoptosis and can increase ROS levels when inhibited.
• Caspase-independent cell death: a form of cell death that is regulated by ROS.
    -Increasing caspase-independent cell death can increase ROS levels
• DNA damage response: regulates the repair of DNA damage. Increasing DNA damage can increase ROS
• Epigenetic regulation: process by which gene expression is regulated.
    -Increasing epigenetic regulation can increase ROS levels

-PKM2, but not PKM1, can be inhibited by direct oxidation of cysteine 358 as an adaptive response to increased intracellular reactive oxygen species (ROS)

ProOxidant Strategy:(inhibit the Mevalonate Pathway (likely will also inhibit GPx)
-HydroxyCitrate (HCA) found as supplement online and typically used in a dose of about 1.5g/day or more
-Atorvastatin typically 40-80mg/day, -Dipyridamole typically 200mg 2x/day Combined effect research
-Lycopene typically 100mg/day range (note debatable as it mainly lowers NRF2)

Dual Role of Reactive Oxygen Species and their Application in Cancer Therapy 
ROS-Inducing Interventions in Cancer — Canonical + Mechanistic Reference
-generated from AI and Cancer database
ROS rating:  +++ strong | ++ moderate | + weak | ± mixed | 0 none
NRF2:        ↓ suppressed | ↑ activated | ± mixed | 0 none
Conditions:  [D] dose  [Fe] metal  [M] metabolic  [O₂] oxygen
             [L] light [F] formulation [T] tumor-type [C] combination




Item ROS↑ NRF2 Condition Mechanism Class Remarks 



ROS">Piperlongumine
+++ ↓ [D][T] ROS-dominant






ROS">Shikonin
+++↓/±[D][T]ROS-dominant






ROS">Vitamin K3 (menadione)
+++↓[D]ROS-dominant






ROS">Copper (ionic / nano)
+++↓[Fe][F]ROS-dominant






ROS">Sodium Selenite
+++↓[D]ROS-dominant






ROS">Juglone
+++↓[D]ROS-dominant






ROS">Auranofin
+++↓[D]ROS-dominant






ROS">Photodynamic Therapy (PDT)
+++0[L][O₂]ROS-dominant






ROS">Radiotherapy / Radiation
+++0[O₂]ROS-dominant






ROS">Doxorubicin
+++↓[D]ROS-dominant






ROS">Cisplatin
++↓[D][T]ROS-dominant






ROS">Salinomycin
++↓[D][T]ROS-dominant






ROS">Artemisinin / DHA
++↓[Fe][T]ROS-dominant






ROS">Sulfasalazine
++↓[C][T]ROS-dominant






ROS">FMD / fasting
++↓[M][C][O₂]ROS-dominant






ROS">Vitamin C (pharmacologic)
++↓[Fe][D]ROS-dominant






ROS">Silver nanoparticles
++±[F][D]ROS-dominant






ROS">Gambogic acid
++↓[D][T]ROS-dominant






ROS">Parthenolide
++↓[D][T]ROS-dominant






ROS">Plumbagin
++↓[D]ROS-dominant






ROS">Allicin
++↓[D]ROS-dominant






ROS">Ashwagandha (Withaferin A)
++↓[D][T]ROS-dominant






ROS">Berberine
++↓[D][M]ROS-dominant






ROS">PEITC
++↓[D][C]ROS-dominant






ROS">Methionine restriction
+↓[M][C][T]ROS-secondary






ROS">DCA
+±[M][T]ROS-secondary






ROS">Capsaicin
+±[D][T]ROS-secondary






ROS">Galloflavin
+0[D]ROS-secondary






ROS">Piperine
+±[D][F]ROS-secondary






ROS">Propyl gallate
+↓[D]ROS-secondary






ROS">Scoulerine
+?[D][T]ROS-secondary






ROS">Thymoquinone
±±[D][T]Dual redox






ROS">Emodin
±±[D][T]Dual redox






ROS">Alpha-lipoic acid (ALA)
±↑[D][M]NRF2-dominant






ROS">Curcumin
±↑/↓[D][F]NRF2-dominant






ROS">EGCG
±↑/↓[D][O₂]NRF2-dominant






ROS">Quercetin
±↑/↓[D][Fe]NRF2-dominant






ROS">Resveratrol
±↑[D][M]NRF2-dominant






ROS">Sulforaphane
±↑↑[D]NRF2-dominant






ROS">Lycopene
0↑—Antioxidant






ROS">Rosmarinic acid
0↑—Antioxidant






ROS">Citrate
00—Neutral


Scientific Papers found: Click to Expand⟱
6027- CGA,  CUR,  EGCG,  QC,  RES  Contribution of Non-Coding RNAs to Anticancer Effects of Dietary Polyphenols: Chlorogenic Acid, Curcumin, Epigallocatechin-3-Gallate, Genistein, Quercetin and Resveratrol
- Review, Nor, NA
*ROS↓, polyphenols have similar chemical and biological properties in that they can act as antioxidants and exert the anticancer effects via cell signaling pathways involving their reactive oxygen species (ROS)-scavenging activity.
ROS↑, These polyphenols may also act as pro-oxidants under certain conditions, especially at high concentrations.

1997- Myr,  QC,    Inhibition of Mammalian thioredoxin reductase by some flavonoids: implications for myricetin and quercetin anticancer activity
- in-vitro, Lung, A549
TrxR↓, Myricetin and quercetin were found to have strong inhibitory effects on mammalian TrxRs with IC50 values of 0.62 and 0.97 micromol/L, respectively
eff↑, Oxygen-derived superoxide anions enhanced the inhibitory effect whereas anaerobic conditions attenuated inhibition.
TumCCA↑, cell cycle was arrested in S phase by quercetin and an accumulation of cells in sub-G1 was observed in response to myricetin.
eff↓, presence of superoxide dismutase diminished the inhibition dramatically
ROS↑, show that ROS played a critical role in the inhibition of TrxR by flavonoids. ...may occur as a result of their easy oxidization to flavonol semiquinone species.

910- QC,    The Anti-Cancer Effect of Quercetin: Molecular Implications in Cancer Metabolism
tumCV↓,
Apoptosis↑,
PI3k/Akt/mTOR↓, QUE induces cell death by inhibiting PI3K/Akt/mTOR and STAT3 pathways in PEL cells
Wnt/(β-catenin)↓, reducing β-catenin
MAPK↝,
ERK↝, ERK1/2
TumCCA↑, cell cycle arrest at the G1 phase
H2O2↑,
ROS↑,
TumAuto↑,
MMPs↓, Consistently, QUE was able to reduce the protein levels of MMP-2, MMP-9, VEGF and mTOR, and p-Akt in breast cancer cell lines
P53↑,
Casp3↑,
Hif1a↓, by inactivating the Akt-mTOR pathway [64,74] and HIF-1α
cFLIP↓,
IL6↓, QUE decreased the release of interleukin-6 (IL-6) and IL-10
IL10↓,
lactateProd↓,
Glycolysis↓, It is suggested that QUE alters glucose metabolism by inhibiting monocarboxylate transporter (MCT) activity
PKM2↓,
GLUT1↓,
COX2↓,
VEGF↓,
OCR↓,
ECAR↓,
STAT3↓,
MMP2↓, Consistently, QUE was able to reduce the protein levels of MMP-2, MMP-9, VEGF and mTOR, and p-Akt in breast cancer cell lines
MMP9:TIMP1↓,
mTOR↓,

908- QC,    Molecular Targets Underlying the Anticancer Effects of Quercetin: An Update
- Review, NA, NA
AntiCan↑, quercetin exerts anticancer effect by binding to cellular receptors and proteins
ROS↑, The short-term effect causes scavenging of free radicals and it is mostly antioxidative and antiapoptotic in nature, while the long term effect is pro-oxidative

906- QC,    The interplay between reactive oxygen species and antioxidants in cancer progression and therapy: a narrative review
- Review, NA, NA
ROS↑, quercetin at higher concentrations (>50 µM) can initiate ROS generation especially O2•−

905- QC,    Anti- and pro-oxidant effects of quercetin in copper-induced low density lipoprotein oxidation. Quercetin as an effective antioxidant against pro-oxidant effects of urate
- Analysis, NA, NA
ROS↑, pro-oxidant behavior depends on the Cu(2+) concentration

904- QC,    Antioxidant and prooxidant effects of quercetin on glyceraldehyde-3-phosphate dehydrogenase
- Analysis, NA, NA
ROS↑, Quercetin significantly increased oxidation of GAPDH observed in the presence of ferrous ions
H2O2↑,

903- QC,    Potential toxicity of quercetin: The repression of mitochondrial copy number via decreased POLG expression and excessive TFAM expression in irradiated murine bone marrow
- in-vivo, NA, NA
ROS⇅, antioxidant and prooxidant effects largely relates to its dose

902- QC,    Prooxidant activities of quercetin, p-courmaric acid and their derivatives analysed by quantitative structure–activity relationship
- Analysis, NA, NA
ROS↑, metal ion and concentration of tested phenolics are widely suggested to affect the prooxidant activity of phenolics

901- QC,    Antioxidant/prooxidant effects of α-tocopherol, quercetin and isorhamnetin on linoleic acid peroxidation induced by Cu(II) and H2O2
- Analysis, Var, NA
ROS↑, presence/ absence of metal ions modulates the biological or pharmacological behavior of flavonoids to act as an antioxidant or prooxidant

900- QC,    Quercetin Affects Erythropoiesis and Heart Mitochondrial Function in Mice
- in-vivo, Nor, NA
*Weight↓, overall weight
*TAC∅, no significant decrease
*ROS↑, working hypothesis is that quercetin interferes with mitochondrial function exacerbating mitochondrial ROS generation and altering the physiology of tissues highly dependent on iron metabolism

912- QC,  2DG,    Selected polyphenols potentiate the apoptotic efficacy of glycolytic inhibitors in human acute myeloid leukemia cell lines. Regulation by protein kinase activities
Apoptosis↑,
ROS↓, 2-DG (5 mM) and Quer (10–40 μM) reduced the basal intracellular ROS content in HL60 cells
GSH∅, GSH levels were not significantly affected by treatment for 3 h
other↑, activated apoptosis throughout the mitochondrial (“intrinsic”) executioner pathway

899- QC,    Intracellular metabolism and bioactivity of quercetin and its in vivo metabolites
- in-vivo, Var, NA
ROS↑, effects of quercetin on cells seem to be dependent both on cell type and in particular on the concentration of quercetin
GSH↓,

898- QC,    Anti- and pro-oxidant activity of rutin and quercetin derivatives
- Analysis, Var, NA
ROS↑, quercetin derivatives with free catechol moiety or free hydroxyl in position 3 (or both) were pro-oxidant

897- QC,    Anti- and prooxidant effects of chronic quercetin administration in rats
- in-vivo, Nor, NA
*MDA↓, in rat livers (decrease was more pronounced in vitamin E-deprived rats)
*GSH⇅, in liver
*ROS⇅, results suggest that quercetin may act not only as an antioxidant, but also as a prooxidant in rats.

896- QC,    Antioxidant and pro-oxidant actions of the plant phenolics quercetin, gossypol and myricetin: Effects on lipid peroxidation, hydroxyl radical generation and bleomycin-dependent damage to DNA
- in-vivo, Var, NA
ROS↑, Hence these naturally-occurring substances can have pro-oxidant effects under some reaction conditions and cannot be classified simplistically as “antioxidants”.

895- QC,    Theoretical Study of the Antioxidant Activity of Quercetin Oxidation Products
- Analysis, Var, NA
ROS⇅,

894- QC,    The antioxidant, rather than prooxidant, activities of quercetin on normal cells: quercetin protects mouse thymocytes from glucose oxidase-mediated apoptosis
- in-vitro, Nor, NA
Apoptosis↑, capable of inducing apoptosis in tumor cell
*NF-kB↓, the G/GO-mediated increase in NF-kB activity was clearly inhibited when the cells were pretreated with 50uM quercetin
*AP-1↓, activation is suppressed by quercetin treatment.
*P53↝, G/GO-mediated oxidative stress activates nuclear translocation and activation of the wild-type p53 in thymocytes and that this activation is inhibited by quercetin.
*ROS↓, normal mouse thymocytes glucose oxidase stress

893- QC,    Quercetin: Prooxidant Effect and Apoptosis in Cancer
- Analysis, Var, NA
ROS↑, proposal that the capacity of quercetin as a phytochemical that is able to trigger apoptosis in several tumor cell lineages might be related to its prooxidant features.

892- QC,    Antioxidant vs. pro-oxidant activities of quercetin in aqueous phase: A Density Functional Theory study
- Analysis, Var, NA
ROS↑, influenced by concentration, pH of environment and the presence of redox metal.

891- QC,    Chapter 9 - Quercetin: Prooxidant Effect and Apoptosis in Cancer
- in-vitro, Var, NA
ROS↑, substantial evidence that its prooxidant features are also relevant regarding its tumoricidal effects
AntiTum↑, promote tumoricidal effects.

890- QC,    PROOXIDANT ACTIVITIES OF ANTIOXIDANTS AND THEIR IMPACT ON HEALTH
- Review, Var, NA
ROS↑, in the presence of the transition metal

889- QC,    The multifaceted role of quercetin derived from its mitochondrial mechanism
- vitro+vivo, Var, NA
MMP↓,
ATP↝,
OXPHOS↝,
ROS↑, a prooxidant effect

3338- QC,    Quercetin: Its Antioxidant Mechanism, Antibacterial Properties and Potential Application in Prevention and Control of Toxipathy
- Review, Var, NA - Review, Stroke, NA
*antiOx↑, The antioxidant mechanism of quercetin in vivo is mainly reflected in its effects on glutathione (GSH), signal transduction pathways, reactive oxygen species (ROS), and enzyme activities.
*GSH↑,
*ROS↓,
*Dose↑, antioxidant properties of quercetin show a concentration dependence in the low dose range but too much of the antioxidant brings about the opposite result
*NADPH↓, quercetin counteracts atherosclerosis by reversing the increased expression of NADPH oxidase i
*AMP↓, decreases in activation of AMP-activated protein kinase, thereby inhibiting NF-κB signaling
*NF-kB↓,
*p38↑, quercetin improves the antioxidant capacity of cells by activating the intracellular p38 MAPK pathway, increasing intracellular GSH levels and providing a source of hydrogen donors in the scavenging of free radical reactions.
*MAPK↑,
*SOD↑, quercetin achieves protection against acute spinal cord injury by up-regulating the activity of SOD, down-regulating the level of malondialdehyde (MDA), and inhibiting the p38MAPK/iNOS signaling pathway
*MDA↓,
*iNOS↓,
*Catalase↑, quercetin reduces imiquimod (IMQ)-induced MDA levels in skin tissues and enhances catalase, SOD, and GSH activities, which together improve the antioxidant properties of the body
*PI3K↑, It also controls the development of atherosclerosis induced by high fructose diet by enhancing PI3K/AKT and inhibiting ROS
*Akt↑,
*lipid-P↓, Quercetin enhances antioxidant activity and inhibits lipid cultivation, and it is effective in the treatment of oxidative liver damag
*memory↑, reversed hypoxia-induced memory impairment
*radioP↑, Quercetin protects cells from radiation and genotoxicity-induced damage by increasing endogenous antioxidant and scavenging free radical levels
*neuroP↑, This suggests that quercetin may be a potential neuroprotective agent against ischemia, which protects CA1 vertebral neurons from I/R injury in the hippocampal region of animals
*MDA↓, quercetin significantly reduced MDA levels and increased SOD and catalase levels.

3336- QC,    Neuroprotective Effects of Quercetin in Alzheimer’s Disease
- Review, AD, NA
*neuroP↑, Neuroprotection by quercetin has been reported in several in vitro studies
*lipid-P↓, It has been shown to protect neurons from oxidative damage while reducing lipid peroxidation.
*antiOx↑, In addition to its antioxidant properties, it inhibits the fibril formation of amyloid-β proteins, counteracting cell lyses and inflammatory cascade pathways.
*Aβ↓,
*Inflam↓,
*BBB↝, It also has low BBB penetrability, thus limiting its efficacy in combating neurodegenerative disorders.
*NF-kB↓, downregulating pro-inflammatory cytokines, such as NF-kB and iNOS, while stimulating neuronal regeneration
*iNOS↓,
*memory↑, Quercetin has shown therapeutic efficacy, improving learning, memory, and cognitive functions in AD
*cognitive↑,
*AChE↓, Quercetin administration resulted in the inhibition of AChE
*MMP↑, quercetin ameliorates mitochondrial dysfunction by restoring mitochondrial membrane potential, decreases ROS production, and restores ATP synthesis
*ROS↓,
*ATP↑,
*AMPK↑, It also increased the expression of AMP-activated protein kinase (AMPK), which is a key cell regulator of energy metabolism.
*NADPH↓, Activated AMPK can decrease ROS generation by inhibiting NADPH oxidase activity
*p‑tau↓, Inhibition of AβAggregation and Tau Phosphorylation

2431- QC,    The Protective Effect of Quercetin against the Cytotoxicity Induced by Fumonisin B1 in Sertoli Cells
- in-vitro, Nor, TM4
*Apoptosis↓, 40 μM quercetin improved cell viability, reduced apoptosis, and preserved cell functions.
*ROS↓, Quercetin also decreased reactive oxygen species (ROS) levels in TM4 cells exposed to FB1
*antiOx↓, enhanced the expression of antioxidant genes
*MMP↑, improved mitochondrial membrane potential.
*GPI↑, elevated the mRNA and protein expression of glycolysis-related genes, including (Gpi1), (Hk2), (Aldoa), (Pkm), lactate (Ldha) and (Pfkl)
*HK2↑,
*ALDOA↑,
*PKM1↑,
*LDHA↑,
*PFKL↑,

2343- QC,    Pharmacological Activity of Quercetin: An Updated Review
- Review, Nor, NA
*ROS↓, Quercetin is a potent scavenger for ROS and hence protects the body against oxidative stress
*GSH↑, Studies of animals and cells have shown that the synthesis of GSH is induced by quercetin.
*Catalase↑, increased expression of superoxide dismutase (SOD), catalase (CAT), and GSH has been reported with the pretreatment of quercetin
*SOD↑,
*MDA↓, quercetin supplementation to layer chickens significantly reduced malondialdehyde (MDA) levels in the kidneys, liver, and heart and increased GSH, CAT, and glutathione peroxidase (GSH-Px) activities in the liver, kidney, and heart tissue
*GPx↑,
*Copper↓, In addition, quercetin can exert antioxidant effects by chelating Cu2+ and Fe2+ in its structure with catechol
*Iron↓,
Apoptosis↓, Quercetin inhibits the proliferation of liver cancer cells via induction of apoptosis and cell cycle arrest [43].
TumCCA↑,
MMP2↓, In HSC-6, SCC-9 human oral cancer cell lines, quercetin inhibits cell viability, migration, and invasion, reduces MMP-2 and MMP-9 abundance, downgrades miR-16, and upgrades HOXA10
MMP9↓,
GlucoseCon↓, quercetin inhibits the mobility of cancer cells by inhibiting glucose uptake and lactic acid production and reducing levels of PKM2, GLUT1, and LDHA, which may have a significant role in controlling breast cancer [56].
lactateProd↓,
PKM2↓,
GLUT1↓,
LDHA↓,
ROS↑, Quercetin encapsulated in solid lipid nanoparticles ,MCF-7 and MCF-10A cells, Increase (ROS)

2338- QC,    Quercetin: A Flavonoid with Potential for Treating Acute Lung Injury
- Review, Nor, NA
*SIRT1↑, Quercetin increased SIRT1 expression in lung tissue, inhibited NLRP3 inflammasome activation, and reduced the release of pro-inflammatory factors (TNFα, IL-1β, and IL-6), preventing the up-regulation of nuclear PKM2 in the lung.
*NLRP3↓,
*Inflam↓,
*TNF-α↓,
*IL1β↓,
*IL6↓,
*PKM2↓, preventing the up-regulation of nuclear PKM2 in the lung.
*HO-1↑, Quercetin increased HO-1 expression in the lungs of a septic lung injury mouse model
*ROS↓, puncture in rats, showing that early administration of Quercetin reduced the levels of oxidative stress markers, such as xanthine oxidase (XO), nitric oxide (NO), and malondialdehyde (MDA), and increased the levels of antioxidant enzymes in lung tiss
*NO↓,
*MDA↓,
*antiOx↑,
*COX2↓, Quercetin also reduced the expression of COX-2, HMGB1, and iNOS expression and NF-κB p65 phosphorylation
*HMGB1↓,
*iNOS↓,
*NF-kB↓,

1201- QC,    Quercetin: a silent retarder of fatty acid oxidation in breast cancer metastasis through steering of mitochondrial CPT1
- in-vivo, BC, NA
mitResp↓, significant reduction in the intracellular mitochondrial respiration
Glycolysis↓,
ATP↓,
ROS↑,
GSH↓,
TumMeta↓,
Apoptosis↑,
FAO↓,

980- QC,    Dietary Quercetin Exacerbates the Development of Estrogen-Induced Breast Tumors in Female ACI Rats
- in-vivo, BC, NA
COMT↓, bad
ROS∅, quercetin (2.5 g/kg food) does not confer protection against breast cancer, does not inhibit E2-induced oxidant stress and may exacerbate breast carcinogenesis in E2-treated ACI rats.

923- QC,    Quercetin as an innovative therapeutic tool for cancer chemoprevention: Molecular mechanisms and implications in human health
- Review, Var, NA
ROS↑, decided by the availability of intracellular reduced glutathione (GSH),
GSH↓, extended exposure with high concentration of quercetin causes a substantial decline in GSH levels
Ca+2↝,
MMP↓,
Casp3↑, activation of caspase-3, -8, and -9
Casp8↑,
Casp9↑,
other↓, when p53 is inhibited, cancer cells become vulnerable to quercetin-induced apoptosis
*ROS↓, Quercetin (QC), a plant-derived bioflavonoid, is known for its ROS scavenging properties and was recently discovered to have various antitumor properties in a variety of solid tumors.
*NRF2↑, Moreover, the therapeutic efficacy of QC has also been defined in rat models through the activation of Nrf-2/HO-1 against high glucose-induced damage
HO-1↑,
TumCCA↑, QC increases cell cycle arrest via regulating p21WAF1, cyclin B, and p27KIP1
Inflam↓, QC-mediated anti-inflammatory and anti-apoptotic properties play a key role in cancer prevention by modulating the TLR-2 (toll-like receptor-2) and JAK-2/STAT-3 pathways and significantly inhibit STAT-3 tyrosine phosphorylation within inflammatory ce
STAT3↓,
DR5↑, several studies showed that QC upregulated the death receptor (DR)
P450↓, it hinders the activity of cytochrome P450 (CYP) enzymes in hepatocytes
MMPs↓, QC has also been shown to suppress metastatic protein expression such as MMPs (matrix metalloproteases)
IFN-γ↓, QC is its ability to inhibit inflammatory mediators including IFN-γ, IL-6, COX-2, IL-8, iNOS, TNF-α,
IL6↓,
COX2↓,
IL8↓,
iNOS↓,
TNF-α↓,
cl‑PARP↑, Induced caspase-8, caspase-9, and caspase-3 activation, PARP cleavage, mitochondrial membrane depolarization,
Apoptosis↑, increased apoptosis and p53 expression
P53↑,
Sp1/3/4↓, HT-29 colon cancer cells: decreased the expression of Sp1, Sp3, Sp4 mrna, and survivin,
survivin↓,
TRAILR↑, H460 Increased the expression of TRAILR, caspase-10, DFF45, TNFR 1, FAS, and decreased the expression of NF-κb, ikkα
Casp10↑,
DFF45↑,
TNFR 1↑,
Fas↑,
NF-kB↓,
IKKα↓,
cycD1/CCND1↓, SKOV3 Reduction in cyclin D1 level
Bcl-2↓, MCF-7, HCC1937, SK-Br3, 4T1, MDA-MB-231 Decreased Bcl-2 expression, increasedBax expression, inhibition of PI3K-Akt pathway
BAX↑,
PI3K↓,
Akt↓,
E-cadherin↓, MDA-MB-231 Induced the expression of E-cadherin and downregulated vimentin levels, modulation of β-catenin target genes such as cyclin D1 and c-Myc
Vim↓,
β-catenin/ZEB1↓,
cMyc↓,
EMT↓, MCF-7 Suppressed the epithelial–mesenchymal transition process, upregulated E-cadherin expression, downregulated vimentin and MMP-2 expression, decreased Notch1 expression
MMP2↓,
NOTCH1↓,
MMP7↓, PANC-1, PATU-8988 Decreased the secretion of MMP and MMP7, blocked the STAT3 signaling pathway
angioG↓, PC-3, HUVECs Reduced angiogenesis, increased TSP-1 protein and mrna expression
TSP-1↑,
CSCs↓, PC-3 and LNCaP cells Activated capase-3/7 and inhibit the expression of Bcl-2, surviving and XIAP in CSCs.
XIAP↓,
Snail↓, inhibiting the expression of vimentin, slug, snail and nuclear β-catenin, and the activity of LEF-1/TCF responsive reporter
Slug↓,
LEF1↓,
P-gp↓, MCF-7 and MCF-7/dox cell lines Downregulation of P-gp expression
EGFR↓, MCF-7 and MDA-MB-231 cells Suppressed EGFR signaling and inhibited PI3K/Akt/mTOR/GSK-3β
GSK‐3β↓,
mTOR↓,
RAGE↓, IA Paca-2, BxPC3, AsPC-1, HPAC and PANC1 Silencing RAGE expression
HSP27↓, Breast cancer In vivo NOD/SCID mice Inhibited the overexpression of Hsp27
VEGF↓, QC significantly reversed an elevation in profibrotic markers (VEGF, IL-6, TGF, COL-1, and COL-3)
TGF-β↓,
COL1↓,
COL3A1↓,

922- QC,    Quercetin and ovarian cancer: An evaluation based on a systematic review
- Review, NA, NA
ROS↑, presence of peroxidases, Q reacts with H2O2 to form a Q-quinone (QQ) that has a pro-oxidant effect

921- QC,    Essential requirement of reduced glutathione (GSH) for the anti-oxidant effect of the flavonoid quercetin
- in-vitro, lymphoma, U937
ROS↑, long periods it showed a pro-oxidant activity
GSH↓, long periods

920- QC,    Interfering with ROS Metabolism in Cancer Cells: The Potential Role of Quercetin
- Review, NA, NA
GSH↓, Qu depletes GSH in a concentration-dependent manner;
ROS↑, Because normal, non-transformed cells have a lower basal intracellular ROS level, and have a full antioxidant capacity, they should be less vulnerable to the ROS stress that is induced by Qu. ****

919- QC,    Quercetin Regulates Sestrin 2-AMPK-mTOR Signaling Pathway and Induces Apoptosis via Increased Intracellular ROS in HCT116 Colon Cancer Cells
- in-vitro, CRC, HCT116
Apoptosis↑,
ROS↑,
SESN2↑,
P53↑,
AMPKα↑,
mTOR↓,

918- QC,  CUR,  VitC,    Anti- and pro-oxidant effects of oxidized quercetin, curcumin or curcumin-related compounds with thiols or ascorbate as measured by the induction period method
- Analysis, NA, NA
ROS↑, CUR enhances the prooxidant activity of ascorbate(vit C)
ROS↑, Under anaerobic conditions, QUE, with a catechol ring, may be more prooxidant than CUR, with a phenol ring.

915- QC,    Hormesis and synergy: pathways and mechanisms of quercetin in cancer prevention and management
- Review, NA, NA
ROS↑, Pro-oxidant effects are present at cellular concentrations of 40–100uM

914- QC,    Quercetin and Cancer Chemoprevention
- Review, NA, NA
GSH↓, high Qu concentration, causes a reduction in GSH content
ROS↑, in tumor cells
TumCCA↑, Depending on the cell type and tumor origin, Qu is able to block the cell cycle at G2/M or at the G1/S transition
Ca+2↑, Qu treatment increases cytosolic Ca2+ levels
MMP↓,
Casp3↑,
Casp8↑,
Casp9↑,
β-catenin/ZEB1↓,
AMPKα↑,
ASK1↑,
p38↑,
TRAIL↑, Qu is a potent enhancer of TNF-related apoptosis-inducing ligand (TRAIL)-induced apoptosis, through the induction of the expression of death receptor (DR)-5, a phenomenon that specifically occurs in prostate cancer cells
DR5↑,
cFLIP↓,
Apoptosis↑, tumor cell lines are prone to cell-cycle arrest and apoptosis at Qu concentrations that have no or little effect on non-transformed cells ****

66- QC,    Emerging impact of quercetin in the treatment of prostate cancer
- Review, Pca, NA
CycB/CCNB1↓, quercetin has a role in the reduction of cyclin B1 and CDK1 levels,
CDK1↓,
EMT↓, quercetin suppresses epithelial to mesenchymal transition (EMT) and cell proliferation through modulation of Sonic Hedgehog signaling pathway
PI3K↓, Inhibitory effects of quercetin on other pathways such as PI3K, MAPK and WNT pathways have also been validated in cervical cancer
MAPK↓,
Wnt/(β-catenin)↓, wnt
PSA↓,
VEGF↓,
PARP↑,
Casp3↑,
Casp9↑,
DR5↑,
ROS⇅,
Shh↓,
P53↑, figure 1
P21↑, quercetin regulates p21 expression
EGFR↓,
TumCCA↑, quercetin has cell-specific anti-proliferative impacts via stimulation of cell cycle arrest at the G1 stage.
ROS↑, quercetin has been shown to suppress carcinogenesis through various mechanisms including affecting cell proliferation, production of reactive oxygen species and expression of miR-21
miR-21↓,
TumCP↓,
selectivity↑, In breast cancer cells, quercetin inhibits cell proliferation without exerting any cytotoxic impact on normal breast epithelium
PDGF↓, figure 1
EGF↓,
TNF-α↓,
VEGFR2↓,
mTOR↓,
cMyc↓,
MMPs↓,
GRP78/BiP↑,
CHOP↑,

35- QC,    Quercetin may act as a cytotoxic prooxidant after its metabolic activation to semiquinone and quinoidal product
- Study, NA, NA
ROS↑, Quercetin may act as a cytotoxic prooxidant after its metabolic activation to semiquinone and quinoidal product
GSH↓, depletion of GSH

36- QC,    Quercetin induces G2 phase arrest and apoptosis with the activation of p53 in an E6 expression-independent manner in HPV-positive human cervical cancer-derived cells
- in-vitro, Cerv, HeLa - in-vitro, Cerv, SiHa
P53↑,
P21↑,
BAX↑,
Casp3↑,
Casp7↑,
TumCCA↑, G2 phase arrest
ROS↑, high concentrations (>40 µM) is able to act as a prooxidant
TumCCA↑, Quercetin induces G2 phase arrest and apoptosis
Apoptosis↑,

38- QC,    Quercetin inhibits prostate cancer by attenuating cell survival and inhibiting anti-apoptotic pathways
- in-vitro, Pca, DU145 - in-vitro, Pca, PC3
ROS⇅, LNCaP and PC-3 cells that have an oxidative cellular environment showed ROS quenching after quercetin treatment while DU-145 showed rise in ROS levels despite having a highly reductive environment.
GSH↓,
PI3K/Akt⇅, DU-145↓, PC3↑

39- QC,    A Comprehensive Analysis and Anti-Cancer Activities of Quercetin in ROS-Mediated Cancer and Cancer Stem Cells
- Analysis, NA, NA
ROS↑, production of ROS in both cancer, and cancer stem cells,
GSH↓, By directly reducing the intracellular pool of glutathione (GSH), QC can influence ROS metabolism
IL6↓, QC is its ability to inhibit inflammatory mediators including IFN-γ, IL-6, COX-2, IL-8, iNOS, TNF-α, and many other cancer inflammatory mechanisms
COX2↓,
IL8↓,
iNOS↓,
TNF-α↓,
MAPK↑, quercetin-3-methyl ether stopped the growth of cancer in the esophagus by blocking the Akt/mTOR/P70S6k and MAPK pathways, which are important for the growth of cancer
ERK↑,
SOD↑,
ATP↓,
Casp↑,
PI3K/Akt↓,
mTOR↓,
NOTCH1↓,
Bcl-2↓,
BAX↑,
IFN-γ↓,
TumCP↓, QC directly involves inducing apoptosis and/or the cell cycle arrest process, and also inhibits the propagation of rapidly proliferating cells
TumCCA↑,
Akt↓, quercetin-3-methyl ether stopped the growth of cancer in the esophagus by blocking the Akt/mTOR/P70S6k and MAPK pathways, which are important for the growth of cancer
P70S6K↓,
*Keap1↓,
*GPx↑, inhibiting its negative regulator, Keap1, resulting in Nrf-2 nuclear translocation [86]. This results in the production and activation of enzymes namely GPX, CAT, heme oxygenase 1 (HO-1), peroxiredoxin (PRX)
*Catalase↑,
*HO-1↑,
*NRF2↑,
NRF2↑, The effect of QC on nuclear translocation of Nrf-2 in a time-dependent manner, and increased expression level in HepG2, MgM (malignant mesothelioma) MSTO-211H, and H2452 cells at mRNA and protein quantity has been reported recently
eff↑, quercetin coupled with gold nanoparticles promoted apoptosis by inhibiting the EGFR/P13K/Akt-mediated pathway
HIF-1↓, Quercetin has been shown to suppress the Akt-mTOR pathway and hypoxia-induced factor 1 signaling pathway in gastric cancer cells, resulting in preventative autophagy

41- QC,    Quercetin induces mitochondrial-derived apoptosis via reactive oxygen species-mediated ERK activation in HL-60 leukemia cells and xenograft
- vitro+vivo, AML, HL-60
Casp8↑, quercetin significantly induced caspase-8, caspase-9, and caspase-3 activation
Casp9↑,
Casp3↑,
ROS↑, through induction of intracellular oxidative stress
ERK↑, quercetin induced sustained activation of extracellular signal-regulated kinase (ERK)
cl‑PARP↑, , poly ADP-ribose polymerase (PARP) cleavage, and mitochondrial membrane depolarization in HL-60 AML cells.
MMP↓,
eff↓, Moreover, both N-acetylcysteine(NAC) and the superoxide dismutase mimetic, MnTBAP, reversed quercetin-induced intracellular reactive oxygen species production, ERK activation, and subsequent cell death

68- QC,  BaP,    Differential protein expression of peroxiredoxin I and II by benzo(a)pyrene and quercetin treatment in 22Rv1 and PrEC prostate cell lines
- in-vitro, Pca, 22Rv1 - in-vitro, Pca, PrEC
PrxI∅, Prx-I, Prx-II PrEC cells
PrxII∅, PrEC cells
*toxicity↓, lack of quercetin-mediated changes in Prx expression suggests that quercetin does not interfere with H2O2 levels, and thus may have no deleterious effect in normal prostate cells
ROS↓, <10uM Quercetin
ROS↑, BaP-mediated toxicity in both 22Rv1 and PrEC cells was confirmed by a significant increase in reactive oxygen species
ROS∅, Quercetin also antagonized the increase in ROS by BaP which suggests that BaP-mediated oxidative stress could be blocked with quercetin in 22Rv1 and PrEC cells. S
chemoP↑, Studies have shown that quercetin can be a potential chemopreventative agent in prostate cancer.
PrxII↑, A physiologically achievable concentration (5uM) of quercetin increased the expression of Prx II without affecting the Prx I levels in 22Rv1 cells
i-H2O2↓, Upregulation of Prx II may reduce the intracellular levels of H 2 O2 which in turn can interfere with growth signaling pathways suppressing cell proliferation.

90- QC,  HP,    Combination of quercetin and hyperoside inhibits prostate cancer cell growth and metastasis via regulation of microRNA‑21
- in-vitro, Pca, PC3
ROS↑, QH decreased the production of reactive oxygen species (ROS) and increased antioxidant capacity in PC3 cells at various concentrations (2.5‑60 µg/ml) with peak inhibition and augmentation changes of 3.22‑ and 3.00‑fold, respectively.
cl‑Casp3↑, activated/cleaved caspase-3 levels were found to be elevated at low concentration of QH (5 and 10 μg/ml) by ~1.5-fold and at higher concentrations (20 and 40 μg/ml) by ~2.7-fold (Fig. 2E). Poly(adenosine diphosphate ribose)
cl‑PARP↑, analysis revealed an increase in PARP cleavage in PC3 cells following QH treatment
miR-21↓, dose-dependent decrease in miR-21 expression, with inhibition rates of 42, 56 and 77% observed at 5, 10 and 20 μg/ml QH, respectively
PDCD4↑,
TAC↑,
tumCV↓, QH inhibits PC3 cell viability.
TumCI↓, QH inhibits the invasive activity of PC3 cells.

89- QC,  doxoR,    Quercetin reverses the doxorubicin resistance of prostate cancer cells by downregulating the expression of c-met
- in-vitro, Pca, PC3
PI3K/Akt↓, quercetin targeted c-met to inhibit the PI3K/AKT pathway in doxorubicin-resistant prostate cancer cells.
cMET↓, quercetin treatment significantly inhibited c-met expression in PC3/R cells
Casp3↑, combination treatment with quercetin to induce expression of cleaved caspase-3 and −9
Casp9↑,
MMP↓, combination treatment with quercetin and doxorubicin induced a significant decrease of MMP in PC3/R cells compared with cells treated with doxorubicin alone.
ChemoSen↑, Quercetin increased the sensitivity of PC3/R cells to doxorubicin
ROS↑, ROS, which are considered to be key apoptotic inducers (17) were released from the mitochondria into the cytoplasm, due to MMP collapse induced by co-treatment with quercetin and doxorubicin

88- QC,  PacT,    Quercetin Enhanced Paclitaxel Therapeutic Effects Towards PC-3 Prostate Cancer Through ER Stress Induction and ROS Production
- vitro+vivo, Pca, PC3
ROS↑, quercetin and paclitaxel significantly inhibited cell proliferation, increased apoptosis, arrested the cell cycle at the G2/M phase, inhibited cell migration, dramatically induced ER stress to occur, and increased ROS generation.
ER Stress↑,
TumCP↓,
Apoptosis↑,
TumCCA↑,
TumCMig↓,
GRP78/BiP↑, The combined group effectively decreased hnRNPA1 gene expressions and increased the GRP78 and CHOP gene expressions, which are related to ER stress and ROS production
CHOP↑,
TumCG↓, In vivo Tumor Growth Inhibition

87- QC,    Quercetin inhibits prostate cancer by attenuating cell survival and inhibiting anti-apoptotic pathways
- in-vitro, Pca, LNCaP - in-vitro, Pca, DU145 - in-vitro, Pca, PC3
ROS⇅,
BAX↑, quercetin treatment increased BAX levels
PUMA⇅,
β-catenin/ZEB1↓,
Shc↓,
TAp63α↑, DU-145
MAPK↑, DU-145 DU-145
p‑p42↑,
p‑p44↑,
BIM↑, . In androgen-independent PCa cells with mutated p53 (DU-145), quercetin treatment increases cellular BAX levels whereas PUMA and BIM increased

3607- QC,    Mechanisms of Neuroprotection by Quercetin: Counteracting Oxidative Stress and More
- Review, AD, NA - Review, Park, NA
*neuroP↑, supportive evidence for neuroprotective effects of quercetin
*NRF2↑, nduction of Nrf2-ARE and induction of the antioxidant/anti-inflammatory enzyme paraoxonase 2 (PON2).
*PONs↑,
*antiOx↑,
*Inflam↓,
*SIRT1↑, quercetin has been shown to activate sirtuins (SIRT1), to induce autophagy, and to act as a phytoestrogen, all mechanisms by which quercetin may provide its neuroprotection.
*eff↑, Additionally, coadministration of quercetin and alpha-tocopherol has been shown to increase the transport of quercetin across the blood-brain barrier
*ROS↓, was shown to protect rodents from oxidative stress
*cognitive↑, quercetin ameliorates Alzheimer's disease pathology and related cognitive deficits in an aged triple transgenic Alzheimer's disease mouse model
*eff↑, combined oral supplementation of quercetin and fish oil enhanced neuroprotection in rats exposed to 3-nitropropionic acid
*lipid-P↓, Decreased lipid perox. in hippocampus;
*GSH↑, Decreased reduction of GSH, GPx (5, 50 mg/kg)
*GPx↑,
*SOD↑, Diminished reduction of DA levels, SOD, and GPx
*NRF2↑, Quercetin has been shown to counteract oxidative stress-induced cellular damage by activating the Nrf2-ARE pathway


Showing Research Papers: 1 to 50 of 92
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* indicates research on normal cells as opposed to diseased cells
Total Research Paper Matches: 92

Pathway results for Effect on Cancer / Diseased Cells:


Redox & Oxidative Stress ⓘ

GSH↓, 9,   GSH∅, 1,   H2O2↑, 2,   i-H2O2↓, 1,   HO-1↑, 1,   NRF2↑, 1,   OXPHOS↝, 1,   PrxI∅, 1,   PrxII↑, 1,   PrxII∅, 1,   ROS↓, 2,   ROS↑, 37,   ROS⇅, 5,   ROS∅, 2,   SOD↑, 1,   TAC↑, 1,   TrxR↓, 1,  

Mitochondria & Bioenergetics ⓘ

ATP↓, 2,   ATP↝, 1,   EGF↓, 1,   mitResp↓, 1,   MMP↓, 5,   OCR↓, 1,   p‑p42↑, 1,   XIAP↓, 1,  

Core Metabolism/Glycolysis ⓘ

cMyc↓, 2,   ECAR↓, 1,   FAO↓, 1,   GlucoseCon↓, 1,   Glycolysis↓, 2,   lactateProd↓, 2,   LDHA↓, 1,   PI3K/Akt↓, 2,   PI3K/Akt⇅, 1,   PI3k/Akt/mTOR↓, 1,   PKM2↓, 2,  

Cell Death ⓘ

Akt↓, 2,   Apoptosis↓, 1,   Apoptosis↑, 9,   ASK1↑, 1,   BAX↑, 4,   Bcl-2↓, 2,   BIM↑, 1,   Casp↑, 1,   Casp10↑, 1,   Casp3↑, 7,   cl‑Casp3↑, 1,   Casp7↑, 1,   Casp8↑, 3,   Casp9↑, 5,   cFLIP↓, 2,   DR5↑, 3,   Fas↑, 1,   iNOS↓, 2,   MAPK↓, 1,   MAPK↑, 2,   MAPK↝, 1,   p38↑, 1,   PDCD4↑, 1,   PUMA⇅, 1,   survivin↓, 1,   TNFR 1↑, 1,   TRAIL↑, 1,   TRAILR↑, 1,  

Kinase & Signal Transduction ⓘ

AMPKα↑, 2,   Sp1/3/4↓, 1,  

Transcription & Epigenetics ⓘ

miR-21↓, 2,   other↓, 1,   other↑, 1,   Shc↓, 1,   tumCV↓, 2,  

Protein Folding & ER Stress ⓘ

CHOP↑, 2,   ER Stress↑, 1,   GRP78/BiP↑, 2,   HSP27↓, 1,  

Autophagy & Lysosomes ⓘ

SESN2↑, 1,   TumAuto↑, 1,  

DNA Damage & Repair ⓘ

DFF45↑, 1,   P53↑, 5,   PARP↑, 1,   cl‑PARP↑, 3,  

Cell Cycle & Senescence ⓘ

CDK1↓, 1,   CycB/CCNB1↓, 1,   cycD1/CCND1↓, 1,   P21↑, 2,   TAp63α↑, 1,   TumCCA↑, 10,  

Proliferation, Differentiation & Cell State ⓘ

cMET↓, 1,   CSCs↓, 1,   EMT↓, 2,   ERK↑, 2,   ERK↝, 1,   GSK‐3β↓, 1,   mTOR↓, 5,   NOTCH1↓, 2,   P70S6K↓, 1,   PI3K↓, 2,   Shh↓, 1,   STAT3↓, 2,   TumCG↓, 1,   Wnt/(β-catenin)↓, 2,  

Migration ⓘ

Ca+2↑, 1,   Ca+2↝, 1,   COL1↓, 1,   COL3A1↓, 1,   E-cadherin↓, 1,   LEF1↓, 1,   MMP2↓, 3,   MMP7↓, 1,   MMP9↓, 1,   MMP9:TIMP1↓, 1,   MMPs↓, 3,   p‑p44↑, 1,   PDGF↓, 1,   RAGE↓, 1,   Slug↓, 1,   Snail↓, 1,   TGF-β↓, 1,   TSP-1↑, 1,   TumCI↓, 1,   TumCMig↓, 1,   TumCP↓, 3,   TumMeta↓, 1,   Vim↓, 1,   β-catenin/ZEB1↓, 3,  

Angiogenesis & Vasculature ⓘ

angioG↓, 1,   EGFR↓, 2,   HIF-1↓, 1,   Hif1a↓, 1,   VEGF↓, 3,   VEGFR2↓, 1,  

Barriers & Transport ⓘ

GLUT1↓, 2,   P-gp↓, 1,  

Immune & Inflammatory Signaling ⓘ

COX2↓, 3,   IFN-γ↓, 2,   IKKα↓, 1,   IL10↓, 1,   IL6↓, 3,   IL8↓, 2,   Inflam↓, 1,   NF-kB↓, 1,   PSA↓, 1,   TNF-α↓, 3,  

Hormonal & Nuclear Receptors ⓘ

COMT↓, 1,  

Drug Metabolism & Resistance ⓘ

ChemoSen↑, 1,   eff↓, 2,   eff↑, 2,   P450↓, 1,   selectivity↑, 1,  

Clinical Biomarkers ⓘ

EGFR↓, 2,   IL6↓, 3,   PSA↓, 1,   RAGE↓, 1,  

Functional Outcomes ⓘ

AntiCan↑, 1,   AntiTum↑, 1,   chemoP↑, 1,  
Total Targets: 156

Pathway results for Effect on Normal Cells:


Redox & Oxidative Stress ⓘ

antiOx↓, 1,   antiOx↑, 4,   Catalase↑, 3,   Copper↓, 1,   GPx↑, 3,   GSH↑, 3,   GSH⇅, 1,   HO-1↑, 2,   Iron↓, 1,   Keap1↓, 1,   lipid-P↓, 3,   MDA↓, 5,   NRF2↑, 4,   ROS↓, 9,   ROS↑, 1,   ROS⇅, 1,   SOD↑, 3,   TAC∅, 1,  

Mitochondria & Bioenergetics ⓘ

ATP↑, 1,   MMP↑, 2,  

Core Metabolism/Glycolysis ⓘ

ALDOA↑, 1,   AMP↓, 1,   AMPK↑, 1,   GPI↑, 1,   HK2↑, 1,   LDHA↑, 1,   NADPH↓, 2,   PFKL↑, 1,   PKM1↑, 1,   PKM2↓, 1,   PONs↑, 1,   SIRT1↑, 2,  

Cell Death ⓘ

Akt↑, 1,   Apoptosis↓, 1,   iNOS↓, 3,   MAPK↑, 1,   p38↑, 1,  

DNA Damage & Repair ⓘ

P53↝, 1,  

Proliferation, Differentiation & Cell State ⓘ

PI3K↑, 1,  

Migration ⓘ

AP-1↓, 1,  

Angiogenesis & Vasculature ⓘ

NO↓, 1,  

Barriers & Transport ⓘ

BBB↝, 1,  

Immune & Inflammatory Signaling ⓘ

COX2↓, 1,   HMGB1↓, 1,   IL1β↓, 1,   IL6↓, 1,   Inflam↓, 3,   NF-kB↓, 4,   TNF-α↓, 1,  

Synaptic & Neurotransmission ⓘ

AChE↓, 1,   p‑tau↓, 1,  

Protein Aggregation ⓘ

Aβ↓, 1,   NLRP3↓, 1,  

Drug Metabolism & Resistance ⓘ

Dose↑, 1,   eff↑, 2,  

Clinical Biomarkers ⓘ

IL6↓, 1,  

Functional Outcomes ⓘ

cognitive↑, 2,   memory↑, 2,   neuroP↑, 3,   radioP↑, 1,   toxicity↓, 1,   Weight↓, 1,  
Total Targets: 62

Scientific Paper Hit Count for: ROS, Reactive Oxygen Species
92 Quercetin
5 Curcumin
4 Resveratrol
3 Vitamin C (Ascorbic Acid)
1 Chlorogenic acid
1 EGCG (Epigallocatechin Gallate)
1 Myricetin
1 2-DeoxyGlucose
1 benzo(a)pyrene
1 Hyperoside
1 doxorubicin
1 Paclitaxel
1 Lycopene
1 Fisetin
1 Kaempferol
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#:275  State#:%  Dir#:%
  wNotes=on  sortOrder:rid,rpid

 

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