Baicalein / NRF2 Cancer Research Results

Ba, Baicalein: Click to Expand ⟱
Features:

Baicalein — Baicalein is a polyphenolic flavone aglycone found primarily in Scutellaria baicalensis and related botanicals, and is the active unconjugated counterpart of baicalin after intestinal/microbial deconjugation and re-conjugation cycling. It is formally classified as a small-molecule natural-product flavonoid with pleiotropic signaling, redox, metabolic, and enzyme-modulatory activity. Standard abbreviations include Ba or BE. In cancer literature it is best characterized as a multi-target preclinical anticancer scaffold rather than an established oncology drug, with relatively strong mechanistic support for apoptosis induction, survival-pathway suppression, anti-invasive signaling, and 12-lipoxygenase inhibition, but with major translational constraints from poor aqueous solubility, extensive first-pass glucuronidation/sulfation, transporter-enzyme interactions, and the likelihood that many in-vitro exposure levels exceed typical systemic aglycone exposure.

Primary mechanisms (ranked):

  1. 12-lipoxygenase inhibition with downstream suppression of pro-survival, pro-migratory, and pro-angiogenic lipid signaling.
  2. Intrinsic apoptosis induction via mitochondrial destabilization, cytochrome-c release, caspase-9/3 activation, and BAX:BCL-2 shift.
  3. PI3K/AKT survival-axis repression, often with PTEN restoration and reduced downstream anti-apoptotic signaling.
  4. Redox stress modulation with tumor-context ROS↑ and impaired antioxidant buffering, but normal-cell antioxidant protection in oxidative-injury models.
  5. ER-stress and Ca²⁺ stress coupling that amplifies mitochondrial commitment to cell death.
  6. Suppression of glycolysis / hypoxia adaptation, including HIF-1α, HK2, LDHA, PDK1, PKM2, and GLUT1 in relevant models.
  7. Anti-invasive / anti-metastatic signaling through MMP2/MMP9 and related migration programs.
  8. Anti-angiogenic signaling with VEGF reduction.
  9. Contextual chemo- and radiosensitization in selected models.

Bioavailability / PK relevance: Oral translation is constrained by very low water solubility and extensive intestinal/hepatic phase-II metabolism to glucuronide and sulfate conjugates. Human phase-I data show rapid absorption of tablet formulations with peak plasma levels around 2 hours, steady state after repeated dosing, and major circulating/excreted metabolite burden rather than sustained high parent-aglycone exposure. Microbiota, UGT-dependent reconjugation, and transporter/CYP interactions are clinically relevant variables. Intestinal microbiota are mechanistically relevant because baicalin is converted to baicalein before absorption. Poor translational PK is reinforced by very low aqueous solubility, reported around 16.82 μg/mL, and by formulation studies showing large exposure gains after cocrystal/nanodelivery approaches.

In-vitro vs systemic exposure relevance: Many anticancer cell studies use roughly 10–50 μM and sometimes higher. That generally exceeds typical reported average human plasma exposure for parent baicalein after oral dosing, so direct translation of higher-concentration in-vitro effects should be treated cautiously unless formulation enhancement, local delivery, tissue enrichment, conjugate deconjugation, or combination use is specifically justified.

Clinical evidence status: Strong preclinical evidence across multiple tumor models; limited animal efficacy support; human clinical experience is mainly phase-I safety/PK and non-oncology development contexts. There is no established cancer indication or mainstream regulatory oncology deployment as of March 12, 2026.

Here are some of the key pathways and mechanisms implicated in its anticancer effects:
-Apoptosis and Cell Cycle Regulation
-Reactive Oxygen Species ROS↑ Generation and Oxidative Stress (Context and dose dependent)
- ROS↑ related: MMP↓(ΔΨm), ER Stress↑, Ca+2↑, Cyt‑c↑, Caspase-3↑, Caspase-9↑, DNA damage↑,
-Baicalein’s effects on ROS are context-dependent. In some cancer cells, it promotes ROS production to a degree that overwhelms the antioxidant defenses. Elevated ROS levels can damage cellular components and promote apoptosis, essentially tipping the balance toward cell death.
-Conversely, in normal cells, baicalein may exhibit antioxidant properties and reduce ROS↓ under conditions of oxidative stress, highlighting its dual role.
- May Lowers AntiOxidant defense in Cancer Cells: NRF2↓">NRF2↓, GSH↓, HO-1↓
- Raises AntiOxidant defense in Normal Cells: NRF2↑">NRF2↑, SOD↑, GSH↑, Catalase↑, HO-1↑,
-MAPK, ERK Pathway:
-PI3K/Akt Pathway: Inhibition of the PI3K, Akt pathway by baicalein.
-NF-κB Pathway: Baicalein can inhibit
-Inhibition of Metastasis and Invasion: Baicalein can downregulate MMPs, MMP2, MMP9
-Angiogenesis Suppression: VEGF
-Baicalein is a well-known inhibitor of 12-lipoxygenase
-inhibitor of Glycolysis↓ and HIF-1α↓, PKM2↓, cMyc↓, PDK1↓, GLUT1↓, LDHA↓, HK2↓
- promoting PTEN
-chemo-sensitization, chemoProtective, RadioSensitizer, RadioProtective, neuroprotective, Cognitive, Renoprotection, Hepatoprotective, cardioProtective,
- Selectivity: Cancer Cells vs Normal Cells
-low bioavailability but liposomal may improve bioavailability

In summary, baicalein affects cancer cells by modulating multiple pathways—promoting apoptosis, causing cell cycle arrest, generating or modulating ROS levels, inhibiting survival and proliferative signaling (such as MAPK, PI3K/Akt, and NF-κB pathways), and reducing angiogenesis and metastasis.

Many animal studies, doses have been reported in the range of approximately 10 to 200 mg/kg body weight.
For example, some studies exploring anticancer or anti-inflammatory effects in rodent models have used doses around 50–100 mg/kg.
However, these doses do not directly translate to human dosages.
Some human studies or formulations (where they are used as nutraceuticals or supplements) may suggest dosing in the range of a few hundred milligrams per day of the extract, but it is often not standardized to a specific amount of baicalein or baicalin.
-mix with oil?

-ic50 cancer cells 10-30uM, normal cells 50-100uM
-Animal studies, 10 to 100 mg/kg.
-Reported to induce apoptosis, cause cell cycle arrest, inhibit angiogenesis, and modulate various signaling pathways (e.g., STAT3, NF-κB, MAPK).

Mechanistic table

Rank Pathway / Axis Cancer Cells Normal Cells TSF Primary Effect Notes / Interpretation
1 12-Lipoxygenase axis ↓ 12-LOX, ↓ 12-HETE-linked survival / migration signaling ↔ or modest effect P, R Direct target-level antitumor leverage One of the more mechanistically specific baicalein actions. Supports anti-proliferative, anti-migratory, and anti-angiogenic behavior in susceptible tumors.
2 Mitochondria / MPTP ↓ ΔΨm, ↑ mitochondrial dysfunction, ↑ Cyt-c release ↔ or protected in oxidative-injury models R, G Intrinsic apoptosis commitment Mitochondrial collapse is a major convergence point downstream of redox, ER-stress, and survival-pathway suppression.
3 Caspase apoptosis program ↑ BAX, ↓ Bcl-2, ↑ Casp9, ↑ Casp3, ↑ apoptosis ↔ minimal activation G Cell-death execution Widely reported across tumor models; often follows mitochondrial injury rather than representing the earliest event.
4 PI3K / AKT / PTEN axis ↓ PI3K, ↓ p-AKT, ↑ PTEN ↔ or context-dependent R, G Survival suppression A central non-redox pathway that helps explain apoptosis sensitization, cell-cycle arrest, and metabolic downshift.
5 ROS balance ↑ ROS (dose-dependent) or ROS⇅ depending on model ↓ ROS under oxidative challenge P, R, G Tumor-selective redox stress Dual behavior is important: pro-oxidant pressure is common in malignant cells, whereas antioxidant cytoprotection is well documented in stressed non-malignant cells.
6 NRF2 / HO-1 / GSH antioxidant buffering ↓ NRF2, ↓ HO-1, ↓ GSH (context-dependent) ↑ NRF2, ↑ HO-1, ↑ GSH, ↑ SOD / catalase R, G Selectivity gate This divergent redox-buffer response likely contributes to cancer-versus-normal selectivity, but it is model-dependent and should not be overstated as universal.
7 ER stress and Ca²⁺ stress coupling ↑ ER stress, ↑ CHOP, ↑ UPR, ↑ Ca²⁺ dysregulation ↔ buffered homeostasis R, G Stress amplification Likely helps transmit redox/survival perturbation into irreversible mitochondrial death signaling.
8 Glycolysis / HIF-1α adaptation ↓ HIF-1α, ↓ HK2, ↓ LDHA, ↓ PDK1, ↓ PKM2, ↓ GLUT1, ↓ glycolysis ↔ G Metabolic constraint Most convincing in hypoxia-adaptation and gastric / radioresistance models. Usually reflects later transcriptional or adaptation-level effects.
9 NF-κB and MAPK / ERK signaling ↓ NF-κB, MAPK / ERK modulation (often ↓ ERK tone) ↔ or context-dependent P, R, G Signal reprogramming Supports lower inflammatory-survival tone, apoptosis sensitization, and reduced proliferation, but exact direction within MAPK branches can vary by tumor model.
10 Invasion / metastasis axis ↓ MMP2, ↓ MMP9, ↓ migration / invasion ↔ G Anti-invasive phenotype Phenotypically important and relatively consistent, though usually secondary to broader signaling reprogramming.
11 Angiogenesis axis ↓ VEGF, ↓ microvessel support ↔ G Anti-angiogenic support Supported by xenograft and lung-cancer data; best viewed as an adjunct downstream effect rather than sole primary mechanism.
12 Radiosensitization / chemosensitization ↑ treatment sensitivity (context-dependent) Potential normal-tissue protection in oxidative-injury contexts G Combination-use leverage Mechanistically plausible via HIF-1α/glycolysis suppression, NF-κB restraint, and apoptosis priming, but still preclinical and heterogeneous.
13 Clinical Translation Constraint Low parent exposure, variable microbiota handling, rapid conjugation, likely concentration gap May favor safety but complicates efficacy extrapolation G Delivery limitation Poor solubility, strong first-pass metabolism, conjugate predominance, possible CYP/transporter interactions, and lack of oncology-grade clinical validation are the main barriers.

Time-Scale Flag (TSF): P / R / G

  • P: 0–30 min (primary/physical–chemical effects; direct enzymatic or rapid signaling shifts)
  • R: 30 min–3 hr (redox signaling and acute stress-response signaling)
  • G: >3 hr (gene-regulatory adaptation and phenotype-level outcomes)
NRF2, nuclear factor erythroid 2-related factor 2: Click to Expand ⟱
Source: TCGA
Type: Antiapoptotic
Nrf2 is responsible for regulating an extensive panel of antioxidant enzymes involved in the detoxification and elimination of oxidative stress. Thought of as "Master Regulator" of antioxidant response.
-One way to estimate Nrf2 induction is through the expression of NQO1.
NQO1, the most potent inducer:
SFN 0.2 μM,
quercetin (2.5 μM),
curcumin (2.7 μM),
Silymarin (3.6 μM),
tamoxifen (5.9 μM),
genistein (6.2 μM ),
beta-carotene (7.2μM),
lutein (17 μM),
resveratrol (21 μM),
indol-3-carbinol (50 μM),
chlorophyll (250 μM),
alpha-cryptoxanthin (1.8 mM),
and zeaxanthin (2.2 mM)

1. Raising Nrf2 enhances the cell's antioxidant defenses and ↓ROS. This strategy is used to decrease chemo-radio side effects.
2. Downregulating Nrf2 lowers antioxidant defenses and ↑ROS. In cancer cells this leads to DNA damage, and cell death.
3. However there are some cases where increasing Nrf2 paradoxically causes an increase in ROS (cancer cells). Such as cases of Mitochondial overload, signal crosstalk, reductive stress

-In some cases, Nrf2 is overexpressed in cancer cells, which can lead to the activation of genes involved in cell proliferation, angiogenesis, and metastasis. This can contribute to the development of resistance to chemotherapy and targeted therapies.
-Increased Nrf2 expression: Lung, Breast, Colorectal, Prostrate.
Decreased Nrf2 expression: Skine, Liver, Pancreatic.
-Nrf2 is a cytoprotective transcription factor which demonstrated both a negative effect as well as a positive effect on cancer
- "promotes Nrf2 translocation from the cytoplasm to the nucleus," means facilitates the movement of Nrf2 into the nucleus, thereby enhancing the cell's antioxidant and cytoprotective responses. -Major regulator of Nrf2 activity in cells is the cytosolic inhibitor Keap1.

Nrf2 Inhibitors and Activators
Nrf2 Inhibitors: Brusatol, Luteolin, Trigonelline, VitC, Retinoic acid, Chrysin
Nrf2 Activators: SFN, OPZ EGCG, Resveratrol, DATS, CUR, CDDO, Api
- potent Nrf2 inducers from plants include sulforaphane, curcumin, EGCG, resveratrol, caffeic acid phenethyl ester, wasabi, cafestol and kahweol (coffee), cinnamon, ginger, garlic, lycopene, rosemany

Nrf2 plays dual roles in that it can protect normal tissues against oxidative damage and can act as an oncogenic protein in tumor tissue.
– In healthy tissues, NRF2 activation helps protect cells from oxidative damage and maintains cellular homeostasis.
– In many cancers, constitutive activation of NRF2 (often through mutations in NRF2 itself or loss-of-function mutations in KEAP1) leads to an enhanced antioxidant capacity.
– This upregulation can promote tumor cell survival by enabling cancer cells to thrive under oxidative stress, resist chemotherapeutic agents, and sustain metabolic reprogramming.
– Elevated NRF2 levels have been implicated in promoting tumor growth, metastasis, and resistance to therapy in various malignancies.
– High or sustained NRF2 activity is frequently associated with aggressive tumor phenotypes, poorer prognosis, and decreased overall survival in several cancer types.
– While its activation is essential for protecting normal cells from oxidative stress, aberrant or sustained NRF2 activation in tumor cells can lead to enhanced survival, therapeutic resistance, and tumor progression.

NRF2 inhibitors: (to decrease antioxidant defenses and increase cell death from ROS).
-Brusatol: most cited natural inhibitors of Nrf2.
-Luteolin: luteolin can reduce Nrf2 activity in specific cancer models and may enhance cell sensitivity to chemotherapy. However, luteolin is also known as an antioxidant, and its influence on Nrf2 can sometimes be context dependent.
-Apigenin: certain studies to down‑regulate Nrf2 in cancer cells: Dose and context dependent .
-Oridonin:
-Wogonin: although its effects might be cell‑ and dose‑specific.
- Withaferin A

Scientific Papers found: Click to Expand⟱
2626- Ba,    Molecular targets and therapeutic potential of baicalein: a review
- Review, Var, NA - Review, AD, NA - Review, Stroke, NA
AntiCan↓, *neuroP↑, *cardioP↑, *hepatoP↑, *RenoP↑, TumCCA↑, CDK4↓, cycD1/CCND1↓, cycE/CCNE↑, BAX↑, Bcl-2↓, VEGF↓, Hif1a↓, cMyc↓, NF-kB↓, ROS↑, BNIP3↑, *neuroP↑, *cognitive↑, *NO↓, *iNOS↓, *COX2↓, *PGE2↓, *NRF2↑, *p‑AMPK↑, *Ferroptosis↓, *lipid-P↓, *ALAT↓, *AST↓, *Fas↓, *BAX↓, *Apoptosis↓,
2623- Ba,    Activation of the Nrf2/HO-1 signaling pathway contributes to the protective effects of baicalein against oxidative stress-induced DNA damage and apoptosis in HEI193 Schwann cells
- in-vitro, Nor, HEI193
*DNAdam↓, *ROS↓, *Bax:Bcl2↓, *p‑NRF2↑, *HO-1↑, *neuroP↑, *MMP↑,
5508- Ba,    Neuroprotective effects of baicalin and baicalein on the central nervous system and the underlying mechanisms
- Review, Stroke, NA - Review, Park, NA - Review, AD, NA
*neuroP↑, *antiOx↑, *Inflam↓, *BioAv↝, *BioAv↑, *Half-Life↝, *TLR4↓, *NF-kB↓, *iNOS↓, *COX2↓, *TNF-α↓, *12LOX↓, *NLRP3↓, *ROS↓, *IL1β↓, *IL6↓, *GSK‐3β↓, *NRF2↑, *BBB↑, *SOD↑, *GPx↑, *MDA↓,
5501- Ba,    Therapeutic effects and mechanisms of action of Baicalein on stomach cancer: a comprehensive systematic literature review
- Review, GC, NA
AntiCan↑, Apoptosis↑, TumCP↓, TumMeta↓, BAX↑, TumAuto↑, ROS↑, NRF2↝, PI3K↓, Akt↓, NF-kB↓, TGF-β↓, SMAD4↓, GPx4↓, MMP↓, *HO-1↑, *GSTs↑, *antiOx↑, *AntiTum↑, *NRF2↑, ChemoSen↑, Akt↓, mTOR↓, FAK↓, Ki-67↓,
4305- Ba,    Study on the Molecular Mechanism of Baicalin Phosphorylation of Tau Protein Content in a Cell Model of Intervention Cognitive Impairment
- in-vitro, NA, SH-SY5Y
*cognitive↑, *p‑Akt↑, *p‑GSK‐3β↑, *p‑tau↓, *neuroP↑, *NF-kB↓, *AMPK↑, *NRF2↑,
1530- Ba,    Baicalein Decreases Hydrogen Peroxide‐Induced Damage to NG108‐15 Cells via Upregulation of Nrf2
- in-vitro, Nor, NG108-15
*12LOX↓, *ROS↓, *NRF2↑, *eff↑,
1527- Ba,    Baicalein Alleviates Arsenic-induced Oxidative Stress through Activation of the Keap1/Nrf2 Signalling Pathway in Normal Human Liver Cells
- in-vitro, Nor, MIHA
*p‑NRF2↑, *ROS↓, *MDA↓, *antiOx↑,
2292- Ba,  BA,    Baicalin and baicalein in modulating tumor microenvironment for cancer treatment: A comprehensive review with future perspectives
- Review, Var, NA
AntiCan↑, *toxicity↓, BioAv↝, BioAv↓, *ROS↓, *TLR2↓, *NF-kB↓, *NRF2↑, *antiOx↑, *Inflam↓, HDAC1↓, HDAC8↓, Wnt↓, β-catenin/ZEB1↓, PD-L1↓, Sepsis↓, NF-kB↓, LOX1↓, COX2↓, VEGF↑, PI3K↓, Akt↓, mTOR↓, MMP2↓, MMP9↓, SIRT1↑, AMPK↑,

Showing Research Papers: 1 to 8 of 8

* indicates research on normal cells as opposed to diseased cells
Total Research Paper Matches: 8

Pathway results for Effect on Cancer / Diseased Cells:


Redox & Oxidative Stress ⓘ

GPx4↓, 1,   NRF2↝, 1,   ROS↑, 2,  

Mitochondria & Bioenergetics ⓘ

MMP↓, 1,  

Core Metabolism/Glycolysis ⓘ

AMPK↑, 1,   cMyc↓, 1,   SIRT1↑, 1,  

Cell Death ⓘ

Akt↓, 3,   Apoptosis↑, 1,   BAX↑, 2,   Bcl-2↓, 1,  

Autophagy & Lysosomes ⓘ

BNIP3↑, 1,   TumAuto↑, 1,  

Cell Cycle & Senescence ⓘ

CDK4↓, 1,   cycD1/CCND1↓, 1,   cycE/CCNE↑, 1,   TumCCA↑, 1,  

Proliferation, Differentiation & Cell State ⓘ

HDAC1↓, 1,   HDAC8↓, 1,   mTOR↓, 2,   PI3K↓, 2,   Wnt↓, 1,  

Migration ⓘ

FAK↓, 1,   Ki-67↓, 1,   MMP2↓, 1,   MMP9↓, 1,   SMAD4↓, 1,   TGF-β↓, 1,   TumCP↓, 1,   TumMeta↓, 1,   β-catenin/ZEB1↓, 1,  

Angiogenesis & Vasculature ⓘ

Hif1a↓, 1,   LOX1↓, 1,   VEGF↓, 1,   VEGF↑, 1,  

Immune & Inflammatory Signaling ⓘ

COX2↓, 1,   NF-kB↓, 3,   PD-L1↓, 1,  

Drug Metabolism & Resistance ⓘ

BioAv↓, 1,   BioAv↝, 1,   ChemoSen↑, 1,  

Clinical Biomarkers ⓘ

Ki-67↓, 1,   PD-L1↓, 1,  

Functional Outcomes ⓘ

AntiCan↓, 1,   AntiCan↑, 2,  

Infection & Microbiome ⓘ

Sepsis↓, 1,  
Total Targets: 46

Pathway results for Effect on Normal Cells:


Redox & Oxidative Stress ⓘ

antiOx↑, 4,   Ferroptosis↓, 1,   GPx↑, 1,   GSTs↑, 1,   HO-1↑, 2,   lipid-P↓, 1,   MDA↓, 2,   NRF2↑, 6,   p‑NRF2↑, 2,   ROS↓, 5,   SOD↑, 1,  

Mitochondria & Bioenergetics ⓘ

MMP↑, 1,  

Core Metabolism/Glycolysis ⓘ

12LOX↓, 2,   ALAT↓, 1,   AMPK↑, 1,   p‑AMPK↑, 1,  

Cell Death ⓘ

p‑Akt↑, 1,   Apoptosis↓, 1,   BAX↓, 1,   Bax:Bcl2↓, 1,   Fas↓, 1,   Ferroptosis↓, 1,   iNOS↓, 2,  

DNA Damage & Repair ⓘ

DNAdam↓, 1,  

Proliferation, Differentiation & Cell State ⓘ

GSK‐3β↓, 1,   p‑GSK‐3β↑, 1,  

Angiogenesis & Vasculature ⓘ

NO↓, 1,  

Barriers & Transport ⓘ

BBB↑, 1,  

Immune & Inflammatory Signaling ⓘ

COX2↓, 2,   IL1β↓, 1,   IL6↓, 1,   Inflam↓, 2,   NF-kB↓, 3,   PGE2↓, 1,   TLR2↓, 1,   TLR4↓, 1,   TNF-α↓, 1,  

Synaptic & Neurotransmission ⓘ

p‑tau↓, 1,  

Protein Aggregation ⓘ

NLRP3↓, 1,  

Drug Metabolism & Resistance ⓘ

BioAv↑, 1,   BioAv↝, 1,   eff↑, 1,   Half-Life↝, 1,  

Clinical Biomarkers ⓘ

ALAT↓, 1,   AST↓, 1,   IL6↓, 1,  

Functional Outcomes ⓘ

AntiTum↑, 1,   cardioP↑, 1,   cognitive↑, 2,   hepatoP↑, 1,   neuroP↑, 5,   RenoP↑, 1,   toxicity↓, 1,  
Total Targets: 53

Scientific Paper Hit Count for: NRF2, nuclear factor erythroid 2-related factor 2
8 Baicalein
1 Baicalin
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#:38  Target#:226  State#:%  Dir#:2
  wNotes=0  sortOrder:rid,rpid

 

Home Page