Magnolol / P21 Cancer Research Results

MAG, Magnolol: Click to Expand ⟱
Features:
Lignan found in bark of some magnolia species.
Magnolol (MAG) — a bioactive biphenolic compound from Magnolia officinalis
derived from the bark (roots and branches) of Magnolia species such as M. officinalis, M. obovata, and M. grandiflora
The two main bioactive compounds isolated from these plants are MAG (5,5ʹ-diallyl-2,2ʹ-dihydroxybiphenyl) and Honokiol (3,5ʹ-diallyl-4,2ʹ-dihydroxybiphenyl) (Fig. 1) which are phenolic regioisomers.
In the bark extracts of Magnolia plants, the composition of MAG ranges from 1 to 10%, while Honokiol comprises 1 to 5%
Magnolol is a biphenolic neolignan isolated from the bark of Magnolia officinalis. It is structurally related to honokiol and is studied for anti-inflammatory, antioxidant, antimicrobial, and neuroactive effects. In preclinical oncology models, magnolol is reported to modulate NF-κB, STAT3, PI3K/AKT, MAPK, Wnt/β-catenin, and redox pathways, with downstream effects on cell-cycle arrest, apoptosis, invasion/EMT, and angiogenesis. Oral bioavailability is limited and many cytotoxic concentrations reported in vitro are in the tens of µM range, often above typical systemic levels from standard supplementation.

major pathways and molecular targets involved in magnolol’s anticancer actions:
-Apoptosis: ↑ Bax, ↓ Bcl-2, ↑ cytochrome c, ↑ caspase-9, ↑ caspase-3
-Arrests cell cycle at G0/G1 or G2/M phase:↓ Cyclin D1, CDK4, CDK6, Cyclin B1, CDK1
-Inhibits NF-κB activation: ↓ IκBα, COX-2, TNF-α
-Inhibits PI3K, Akt, and mTOR phosphorylation
-Suppresses angiogenesis: ↓ Bcl-XL, Mcl-1, VEGF, cyclin D1
-Inhibits β-catenin nuclear translocation
-increase ROS production in tumor cells → triggers mitochondrial apoptosis
-Magnolol activates Nrf2 in normal cells → upregulates HO-1, NQO1: Protects normal tissue from oxidative stress during chemotherapy or inflammation.

Most in-vitro IC50 values fall in the 10–100 µM range, often above typical systemic exposure.

Rank Pathway / Axis Cancer / Tumor Context Normal Tissue Context TSF Primary Effect Notes / Interpretation
1 NF-κB inflammatory / survival transcription NF-κB ↓; COX-2, cytokines, Bcl-2 family ↓ (reported) Inflammation tone ↓ R, G Anti-inflammatory + anti-survival transcription One of the most consistently reported mechanisms in both inflammatory and tumor models.
2 STAT3 signaling STAT3 phosphorylation ↓ (reported) ↔ R, G Oncogenic transcription suppression Reported in several cancer cell systems; contributes to reduced proliferation and survival signaling.
3 PI3K → AKT → mTOR pathway PI3K/AKT signaling ↓ (model-dependent) ↔ R, G Growth/survival modulation Frequently described as downstream of inflammatory pathway suppression; context-dependent strength.
4 Nrf2 / ARE antioxidant response Modulation context-dependent; may decrease oxidative stress or alter redox tone Nrf2 ↑; HO-1 ↑; GSH ↑ (cytoprotective) R, G Redox regulation Magnolol activates Nrf2 in non-malignant oxidative stress models; tumor direction varies and may influence therapy sensitivity.
5 MAPK pathways (ERK / JNK / p38) MAPK modulation (stress activation or ERK suppression; context-dependent) ↔ P, R, G Signal reprogramming JNK/p38 activation and ERK modulation reported variably depending on cell type and dose.
6 Cell-cycle arrest (G0/G1 or G2/M) Cell-cycle arrest ↑ (reported) ↔ G Cytostasis Associated with Cyclin D1/CDK modulation and checkpoint protein regulation.
7 Intrinsic apoptosis (mitochondrial pathway) Apoptosis ↑; caspases ↑; Bax/Bcl-2 ratio ↑ (reported) ↔ (generally less activation) G Cell death execution Often downstream of survival pathway inhibition and ROS signaling shifts.
8 ROS / redox modulation ROS ↑ in some tumor models; antioxidant effects in non-tumor systems Oxidative stress ↓ in inflammatory models P, R, G Context-dependent redox modulation Biphasic redox behavior similar to other polyphenols; not a universally tumor-selective pro-oxidant.
9 Wnt/β-catenin signaling β-catenin signaling ↓ (reported) ↔ G Proliferation/invasion modulation Reported particularly in colorectal and hepatocellular carcinoma models; keep model-qualified.
10 Invasion / metastasis (MMPs / EMT) MMP2/MMP9 ↓; EMT markers ↓; migration ↓ (reported) ↔ G Anti-invasive phenotype Often secondary to NF-κB/STAT3 pathway suppression.
11 Bioavailability constraint Limited oral bioavailability; rapid metabolism — — Translation constraint Plasma levels after oral dosing are typically lower than many in-vitro cytotoxic concentrations.

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

  • P: 0–30 min (rapid signaling/redox interactions)
  • R: 30 min–3 hr (acute transcription and stress-response signaling shifts)
  • G: >3 hr (gene-regulatory adaptation and phenotype outcomes)
P21, P21: Click to Expand ⟱
Source:
Type: Proapototic
cyclin-dependent kinase inhibitor p21 (also known as p21 WAF1/Cip1) promotes cell cycle arrest in response to many stimuli.
P21 is a cyclin-dependent kinase inhibitor that plays a crucial role in regulating the cell cycle. It is encoded by the CDKN1A gene and is a key player in the cellular response to stress, including DNA damage.
P21 is often considered a tumor suppressor because its expression is upregulated in response to p53 activation, a well-known tumor suppressor protein. When DNA damage occurs, p53 can activate the transcription of the CDKN1A gene, leading to increased levels of P21, which helps prevent the proliferation of damaged cells.
In many cancers, the p53 pathway is disrupted, leading to decreased levels of P21. p21 is a apoptotic marker protein.
Cell cycle arrest gene p21
Scientific Papers found: Click to Expand⟱
5252- MAG,    Insights on the Multifunctional Activities of Magnolol
- Review, Var, NA
BioAv↓, *Inflam↓, *Bacteria↓, *antiOx↑, *neuroP↑, *cardioP↑, CYP1A1↓, *PPARγ↑, *NF-kB↓, *COX2↓, *iNOS↓, *ROS↓, Apoptosis↑, TumCCA↑, cycD1/CCND1↓, cycA1/CCNA1↓, CDK2↓, P21↑, TumCG↓, TumCMig↓, TumCI↓, Ki-67↓, PCNA↓, MMP2↓, MMP9↓, MMP7↓, DNAdam↑, MMP↓, TumCP↓, selectivity↑, PI3K↓, Akt↓, H2O2↓, Hif1a↓, *BDNF↑, *NRF2↑, *AChE↑,
4536- MAG,    Magnolol suppresses proliferation of cultured human colon and liver cancer cells by inhibiting DNA synthesis and activating apoptosis
- in-vitro, Liver, HepG2 - in-vivo, CRC, COLO205
AntiCan↑, selectivity↑, TumCCA↑, P21↑, Apoptosis↑,
4537- MAG,    Effects of magnolol on UVB-induced skin cancer development in mice and its possible mechanism of action
- in-vivo, Melanoma, NA - in-vitro, Melanoma, A431
*cl‑Casp8↑, *PARP↑, *P21↑, tumCV↓, TumCP↓, TumCCA↑, CycB/CCNB1↓, cycA1/CCNA1↓, CDK4↓, CDC2↓, P21↑, Apoptosis↑,
4518- MAG,  Cisplatin,    Evaluating the Magnolol Anticancer Potential in MKN-45 Gastric Cancer Cells
- in-vitro, GC, MKN45
ChemoSen↑, tumCV↓, BAX↑, Bcl-2↓, P21↑, P53↑, MMP9↓,
4514- MAG,    Magnolol and its semi-synthetic derivatives: a comprehensive review of anti-cancer mechanisms, pharmacokinetics, and future therapeutic potential
- Review, Var, NA
AntiCan↑, TumCP↓, TumCCA↑, TumMeta↓, angioG↓, NF-kB↓, MAPK↓, PI3K↓, Akt↓, mTOR↓, BioAv↓, *antiOx↑, *Inflam↓, *AntiAg↑, ChemoSen↑, cycD1/CCND1↓, CycB/CCNB1↓, cycE/CCNE↓, CDK2↓, CDK4↓, p27↑, P21↑, P53↑, PTEN↓, XIAP↓, Mcl-1↓, Casp3↑, Casp9↑, MMP9↑,

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 ⓘ

CYP1A1↓, 1,   H2O2↓, 1,  

Mitochondria & Bioenergetics ⓘ

CDC2↓, 1,   MMP↓, 1,   XIAP↓, 1,  

Cell Death ⓘ

Akt↓, 2,   Apoptosis↑, 3,   BAX↑, 1,   Bcl-2↓, 1,   Casp3↑, 1,   Casp9↑, 1,   MAPK↓, 1,   Mcl-1↓, 1,   p27↑, 1,  

Transcription & Epigenetics ⓘ

tumCV↓, 2,  

DNA Damage & Repair ⓘ

DNAdam↑, 1,   P53↑, 2,   PCNA↓, 1,  

Cell Cycle & Senescence ⓘ

CDK2↓, 2,   CDK4↓, 2,   cycA1/CCNA1↓, 2,   CycB/CCNB1↓, 2,   cycD1/CCND1↓, 2,   cycE/CCNE↓, 1,   P21↑, 5,   TumCCA↑, 4,  

Proliferation, Differentiation & Cell State ⓘ

mTOR↓, 1,   PI3K↓, 2,   PTEN↓, 1,   TumCG↓, 1,  

Migration ⓘ

Ki-67↓, 1,   MMP2↓, 1,   MMP7↓, 1,   MMP9↓, 2,   MMP9↑, 1,   TumCI↓, 1,   TumCMig↓, 1,   TumCP↓, 3,   TumMeta↓, 1,  

Angiogenesis & Vasculature ⓘ

angioG↓, 1,   Hif1a↓, 1,  

Immune & Inflammatory Signaling ⓘ

NF-kB↓, 1,  

Drug Metabolism & Resistance ⓘ

BioAv↓, 2,   ChemoSen↑, 2,   selectivity↑, 2,  

Clinical Biomarkers ⓘ

Ki-67↓, 1,  

Functional Outcomes ⓘ

AntiCan↑, 2,  
Total Targets: 47

Pathway results for Effect on Normal Cells:


Redox & Oxidative Stress ⓘ

antiOx↑, 2,   NRF2↑, 1,   ROS↓, 1,  

Core Metabolism/Glycolysis ⓘ

PPARγ↑, 1,  

Cell Death ⓘ

cl‑Casp8↑, 1,   iNOS↓, 1,  

DNA Damage & Repair ⓘ

PARP↑, 1,  

Cell Cycle & Senescence ⓘ

P21↑, 1,  

Migration ⓘ

AntiAg↑, 1,  

Immune & Inflammatory Signaling ⓘ

COX2↓, 1,   Inflam↓, 2,   NF-kB↓, 1,  

Synaptic & Neurotransmission ⓘ

AChE↑, 1,   BDNF↑, 1,  

Functional Outcomes ⓘ

cardioP↑, 1,   neuroP↑, 1,  

Infection & Microbiome ⓘ

Bacteria↓, 1,  
Total Targets: 17

Scientific Paper Hit Count for: P21, P21
5 Magnolol
1 Cisplatin
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#:121  Target#:234  State#:%  Dir#:2
  wNotes=0  sortOrder:rid,rpid

 

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