Apigenin (mainly Parsley) / P21 Cancer Research Results

Api, Apigenin (mainly Parsley): Click to Expand ⟱
Features:

Apigenin — a plant-derived flavone (4′,5,7-trihydroxyflavone) abundant in parsley/celery/chamomile and other dietary sources, often abbreviated APG (or “Api” in some indexes). It is a small-molecule polyphenol classified as a dietary phytochemical/nutraceutical candidate with broad pleiotropic signaling effects in oncology models (cell-cycle control, apoptosis, inflammatory signaling, metabolic stress, and invasion/angiogenesis programs), but with important translation constraints driven by low aqueous solubility and extensive phase-II conjugation.

Primary mechanisms (ranked):

  1. Pleiotropic pro-apoptotic / cell-cycle checkpoint engagement (mitochondrial apoptosis, caspases; CDK/cyclin suppression; p53 context-dependent)
  2. PI3K–AKT–MAPK signaling suppression with downstream anti-proliferative and anti-migration effects
  3. Inflammation axis suppression (NF-κB; COX-2 and pro-inflammatory cytokine programs)
  4. Redox stress reprogramming (often ROS↑ in cancer models; antioxidant/NRF2 effects are context-dependent and can diverge between cancer vs normal cells)
  5. HIF-1α–glycolysis downshift with ATP stress (model-dependent)
  6. Anti-invasive / anti-EMT programs (FAK/integrins; MMP/uPA; EMT markers)
  7. Epigenetic modulation (HDAC/DNMT/EZH2 axes; context-dependent)
  8. Anti-angiogenic signaling (VEGF/related programs; model-dependent)
  9. Stemness pathway pressure (Hh/GLI, CK2; model-dependent)
  10. Chemo-/death-ligand sensitization (e.g., TRAIL sensitization reported in preclinical systems)

Bioavailability / PK relevance: Oral apigenin exposure is commonly limited by poor water solubility and extensive first-pass metabolism (glucuronidation/sulfation). Human data indicate circulating apigenin is largely present as conjugated metabolites, and dietary intake can yield only low (typically sub-µM) systemic levels; lipidic/self-emulsifying formulations can increase exposure in vivo (formulation-dependent). Reported half-life/kinetic parameters vary widely across studies and matrices.

In-vitro vs systemic exposure relevance: Many anti-cancer in vitro studies use ~10–50+ µM apigenin, which can exceed typical achievable free aglycone systemic levels after oral intake; some effects may therefore be high-concentration or formulation-enabled rather than diet-achievable. Tissue-local exposure (GI lumen, local mucosa) may be higher than plasma, and conjugate biology may contribute (context-dependent).

Clinical evidence status: Predominantly preclinical oncology evidence (cell and animal models) with limited, non-definitive human cancer interventional data; at least one pilot clinical study concept exists/has been registered (status-dependent). Strongest human evidence base is for non-cancer indications and general bioactivity rather than oncology efficacy.

Apigenin present in parsley, celery, chamomile, oranges and beverages such as tea, beer and wine.
"It exhibits cell growth arrest and apoptosis in different types of tumors such as breast, lung, liver, skin, blood, colon, prostate, pancreatic, cervical, oral, and stomach, by modulating several signaling pathways."
-Note half-life reports vary 2.5-90hrs?.
-low solubility of apigenin in water : BioAv (improves when mixed with oil/dietary fat or lipid based formulations)
-best oil might be MCT oils (medium-chain fatty acids)


Pathways:
- Often considered an antioxidant, in cancer cells it can paradoxically induce ROS production
(one report that goes against most others, by lowering ROS in cancer cells but still effective)
- ROS↑ related: MMP↓(ΔΨm), ER Stress↑, Ca+2↑, Cyt‑c↑, Caspases↑, DNA damage↑, UPR↑, cl-PARP↑, HSP↓
- Lowers AntiOxidant defense in Cancer Cells: NRF2↓, GSH↓ (Conflicting evidence about Nrf2)
        - Combined with Metformin (reduces Nrf2) amplifies ROS production in cancer cells while sparing normal cells.
- Raises AntiOxidant defense in Normal Cells: NRF2↑, SOD↑, GSH↑, Catalase↑,
- lowers Inflammation : NF-kB↓, COX2↓, p38↓, Pro-Inflammatory Cytokines : IL-1β↓, TNF-α↓, IL-6↓, IL-8↓
- inhibit Growth/Metastases : , MMPs↓, MMP2↓, MMP9↓, IGF-1↓, uPA↓, VEGF↓, ERK↓
- reactivate genes thereby inhibiting cancer cell growth : HDAC↓, DNMT1↓, DNMT3A↓, EZH2↓, P53↑, HSP↓
- cause Cell cycle arrest : TumCCA↑, cyclin D1↓, cyclin E↓, CDK2↓, CDK4↓, CDK6↓,
- inhibits Migration/Invasion : TumCMig↓, TumCI↓, FAK↓, ERK↓,
- inhibits glycolysis and ATP depletion : HIF-1α↓, PKM2↓, cMyc↓, PDK1↓, GLUT1↓, LDHA↓, HK2↓, Glucose↓, GlucoseCon↓
- inhibits angiogenesis↓ : VEGF↓, HIF-1α↓, PDGF↓, EGFR↓, Integrins↓,
- inhibits Cancer Stem Cells : CSC↓, CK2↓, Hh↓, GLi↓, GLi1↓,
- Others: PI3K↓, AKT↓, JAK↓, 1, 2, 3, STAT↓, 1, 2, 3, 4, 5, 6, Wnt↓, β-catenin↓, AMPK↓,, α↓,, ERK↓, 5↓, JNK↓,
- Shown to modulate the nuclear translocation of SREBP-2 (related to cholesterol).
- Synergies: chemo-sensitization, chemoProtective, RadioSensitizer, RadioProtective, Others(review target notes)
        -Ex: other flavonoids(chrysin, Luteolin, querectin) curcumin, metformin, sulforaphane, ASA
Neuroprotective, Renoprotection, Hepatoprotective, CardioProtective,
- Selectivity: Cancer Cells vs Normal Cells

Apigenin exhibits biological effects (anticancer, anti-inflammatory, antioxidant, neuroprotective, etc.) typically at concentrations roughly in the range of 1–50 µM.

Parsley microgreens can contain up to 2-3 times more apigenin than mature parsley.
Apigenin is typically measured in the range of 1-10 μM for biological activity. Assuming a molecular weight of 270 g/mol for apigenin, we can estimate the following μM concentrations:
10uM*5L(blood)*270g/mol=13.5mg apigenin (assumes 100% bioavailability)
then an estimated 10-20 mg of apigenin per 100 g of fresh weight parlsey
2.2mg/g of apigenin fresh parsley
45mg/g of apigenin in dried parsley (wikipedia)
so 100g of parsley might acheive 10uM blood serum level (100% bioavailability)
BUT bioavailability is only 1-5%
(Supplements available in 75mg liposomal)( Apigenin Pro Liposomal, 200 mg from mcsformulas.com)

A study had 2g/kg bw (meaning 160g for 80kg person) delivered a maximum 0.13uM of plasma concentration @ 7.2hrs.
Assuming parsley is 90-95% water, then that would be ~16g of dried parsley
Conclusion: to reach 10uM would seem very difficult by oral ingestion of parsley.
Other quotes:
      “4g of dried parsley will be enough for 50kg adult”
      5mg/kg BW yields 16uM, so 80Kg person means 400mg (if dried parsley is 130mg/g, then would need 3g/d)
In many cancer cell lines, concentrations in the range of approximately 20–40 µM have been reported to shift apigenin’s activity from mild antioxidant effects (or negligible ROS changes) toward a clear pro-oxidant effect with measurable ROS increases.

Low doses: At lower concentrations, apigenin is more likely to exhibit its antioxidant properties, scavenging ROS and protecting cells from oxidative stress.
In normal cells with robust antioxidant systems, apigenin’s antioxidant effects might prevail, whereas cancer cells—often characterized by an already high level of basal ROS—can be pushed over the oxidative threshold by increased ROS production induced by apigenin.
In environments with lower free copper levels, this pro-oxidant activity is less pronounced, and apigenin may tilt the balance toward its antioxidant function.

Apigenin — cancer-relevant mechanistic pathway matrix

Rank Pathway / Axis Cancer Cells Normal Cells TSF Primary Effect Notes / Interpretation
1 Mitochondrial apoptosis program ΔΨm ↓, Cyt-c ↑, Caspase cascade ↑, apoptosis ↑ ↔ to protective (model-dependent) R Pro-apoptotic stress commitment Frequently reported core phenotype across tumor models; may be downstream of ROS and kinase-network suppression.
2 Cell-cycle control Cyclin D1/E ↓, CDK2/4/6 ↓, arrest ↑ ↔ G Anti-proliferative checkpointing Often couples to p53/p21 context and growth-factor signaling downshift.
3 PI3K / AKT / MAPK PI3K ↓, AKT ↓, ERK ↓ (model-dependent) ↔ R Growth and survival signaling suppression High industry relevance; provides a convergent explanation for anti-growth and anti-migration phenotypes.
4 NF-κB / COX-2 inflammatory axis NF-κB ↓, COX-2 ↓, inflammatory cytokine programs ↓ Inflammatory tone ↓ G Anti-inflammatory microenvironment pressure Relevant to tumor-promoting inflammation and stromal signaling (context-dependent).
5 ROS modulation ROS ↑ (often), DNA damage ↑, ER stress ↑ (model-dependent) ROS injury ↓ / antioxidant support ↑ (context-dependent) P Redox stress bifurcation (tumor vs normal) Frequently described “paradox”: pro-oxidant stress in tumors while normal cells may show antioxidant protection; not universal.
6 NRF2 / antioxidant defense NRF2 ↓, GSH ↓ (often) ↔ (conflicting) NRF2 ↑, SOD ↑, GSH ↑ (context-dependent) G Antioxidant program reprogramming Direction is context- and model-dependent; important for interpreting chemo-compatibility and ROS claims.
7 HIF-1α / glycolysis HIF-1α ↓, glycolysis ↓, ATP ↓ (model-dependent) ↔ G Metabolic stress / Warburg pressure Reported suppression of glycolysis nodes (e.g., GLUT1/LDHA/HK2/PKM2/PDK1) in some models; may be concentration-sensitive.
8 Migration / invasion and EMT EMT ↓, FAK ↓, integrin signaling ↓, MMPs ↓, uPA ↓ ↔ G Anti-metastatic phenotypes Often downstream of kinase-network suppression and inflammatory tone changes.
9 Angiogenesis programs VEGF ↓ (model-dependent) ↔ G Anti-angiogenic signaling pressure Usually indirect via HIF-1α / inflammatory signaling and tumor-stromal coupling.
10 Epigenetic regulation HDAC ↓, DNMTs ↓, EZH2 ↓ (model-dependent) ↔ G Transcriptional reprogramming Mechanistically plausible but often secondary to upstream stress/kinase changes; evidence varies by model.
11 Cancer stemness pathways Hh/GLI ↓, CK2 ↓, CSC phenotypes ↓ (model-dependent) ↔ G Stemness pressure Typically preclinical; may matter for recurrence-resistance hypotheses.
12 Chemosensitization / death-ligand sensitization Sensitization ↑ (model-dependent) ↔ R Combination leverage Examples include TRAIL sensitization in vitro; translation depends on achievable exposure and interaction risk.
13 Clinical Translation Constraint Low solubility; conjugation-heavy PK; in-vitro concentration gap; potential CYP/UGT/SULT interactions Drug–supplement interaction risk relevant to both — Delivery and interaction limitations Oral free-aglycone systemic levels are often low; formulation can change exposure. In vitro CYP inhibition is reported (notably CYP3A4/2C9); apigenin can also inhibit conjugation pathways in models—caution with narrow-therapeutic-index drugs.

TSF

P: 0–30 min
R: 30 min–3 hr
G: >3 hr
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⟱
1564- Api,    Apigenin-induced prostate cancer cell death is initiated by reactive oxygen species and p53 activation
- in-vitro, Pca, 22Rv1 - in-vivo, NA, NA
MDM2↓, NF-kB↓, p65↓, P21↑, ROS↑, GSH↓, MMP↓, Cyt‑c↑, Apoptosis↑, P53↑, eff↓, Bcl-xL↓, Bcl-2↓, BAX↑, Casp↑, TumCG↓, TumVol↓, TumW↓,
1553- Api,    Role of Apigenin in Cancer Prevention via the Induction of Apoptosis and Autophagy
- Review, NA, NA
Dose∅, TumVol↓, Dose∅, COX2↓, Hif1a↓, TumCCA↑, P53↑, P21↑, Casp3↑, DNAdam↑, TumAuto↝,
1548- Api,    A comprehensive view on the apigenin impact on colorectal cancer: Focusing on cellular and molecular mechanisms
- Review, Colon, NA
*BioAv↓, *Half-Life∅, selectivity↑, *toxicity↓, Wnt/(β-catenin)↓, P53↑, P21↑, PI3K↓, Akt↓, mTOR↓, TumCCA↑, TumCI↓, TumCMig↓, STAT3↓, PKM2↓, EMT↓, cl‑PARP↑, Casp3↑, Bax:Bcl2↑, VEGF↓, Hif1a↓, Dose∅, GLUT1↓, GlucoseCon↓,
2640- Api,    Apigenin: A Promising Molecule for Cancer Prevention
- Review, Var, NA
chemoPv↑, ITGB4↓, TumCI↓, TumMeta↓, Akt↓, ERK↓, p‑JNK↓, *Inflam↓, *PKCδ↓, *MAPK↓, EGFR↓, CK2↓, TumCCA↑, CDK1↓, P53↓, P21↑, Bax:Bcl2↑, Cyt‑c↑, APAF1↑, Casp↑, cl‑PARP↑, VEGF↓, Hif1a↓, IGF-1↓, IGFBP3↑, E-cadherin↑, β-catenin/ZEB1↓, HSPs↓, Telomerase↓, FASN↓, MMPs↓, HER2/EBBR2↓, CK2↓, eff↑, AntiAg↑, eff↑, FAK↓, ROS↑, Bcl-2↓, Cyt‑c↑, cl‑Casp3↑, cl‑Casp7↑, cl‑Casp8↑, cl‑Casp9↑, cl‑IAP2↑, AR↓, PSA↓, p‑pRB↓, p‑GSK‐3β↓, CDK4↓, ChemoSen↑, Ca+2↑, cal2↑,
2632- Api,    Apigenin inhibits migration and induces apoptosis of human endometrial carcinoma Ishikawa cells via PI3K-AKT-GSK-3β pathway and endoplasmic reticulum stress
- in-vitro, EC, NA
TumCP↓, TumCCA↑, Apoptosis↑, Bcl-2↓, BAX↑, Bak↑, Casp↑, ER Stress↑, Ca+2↑, ATF4↑, CHOP↑, ROS↑, MMP↓, TumCMig↓, TumCI↓, eff↑, P53↑, P21↑, Cyt‑c↑, Casp9↑, Casp3↑, Bcl-xL↓,
240- Api,    The flavonoid apigenin reduces prostate cancer CD44(+) stem cell survival and migration through PI3K/Akt/NF-κB signaling
- in-vitro, Pca, PC3 - in-vitro, Pca, CD44+
P21↑, p27↑, Casp3↑, Casp8↑, Slug↓, Snail↓, NF-kB↓, PI3K↓, Akt↓,
207- Api,    Involvement of nuclear factor-kappa B, Bax and Bcl-2 in induction of cell cycle arrest and apoptosis by apigenin in human prostate carcinoma cells
- in-vitro, Pca, LNCaP
PSA↓, cycD1/CCND1↓, cycE/CCNE↓, CDK2↓, CDK4/6↓, P21↑, AR↓,
180- Api,    Induction of caspase-dependent apoptosis by apigenin by inhibiting STAT3 signaling in HER2-overexpressing MDA-MB-453 breast cancer cells
- in-vitro, BC, MDA-MB-231
cl‑Casp8↑, cl‑Casp3↑, cl‑PARP↑, BAX∅, Bcl-2∅, Bcl-xL∅, p‑STAT3↓, P53↑, P21↑, p‑JAK2↓, VEGF↓,
177- Api,    Inhibition of MDA-MB-231 breast cancer cell proliferation and tumor growth by apigenin through induction of G2/M arrest and histone H3 acetylation-mediated p21WAF1/CIP1 expression
- in-vitro, BC, MDA-MB-231
Cyc↓, CycB/CCNB1↓, CDK1↓, P21↑, PCNA↝, HDAC↓, TumCP↓, TumCCA↑, ac‑H3↑, TumW↓, TumVol↓,
173- Api,    Apigenin-induced apoptosis is enhanced by inhibition of autophagy formation in HCT116 human colon cancer cells
- in-vitro, Colon, HCT116
CycB/CCNB1↓, cDC2↓, CDC25↓, P53↑, P21↑, cl‑PARP↑, proCasp8↓, proCasp9↓, proCasp3↓,
1151- Api,    Plant flavone apigenin inhibits HDAC and remodels chromatin to induce growth arrest and apoptosis in human prostate cancer cells: In vitro and in vivo study
- in-vitro, Pca, PC3 - in-vitro, Pca, 22Rv1 - in-vivo, NA, NA
TumCCA↑, Apoptosis↑, HDAC↓, P21↑, BAX↑, TumCG↓, Bcl-2↓, Bax:Bcl2↑, HDAC1↓, HDAC3↓,
581- Api,  Cisplatin,    The natural flavonoid apigenin sensitizes human CD44+ prostate cancer stem cells to cisplatin therapy
- in-vitro, Pca, CD44+
Bcl-2↓, survivin↓, Casp8↑, P53↑, Sharpin↓, APAF1↑, p‑Akt↓, NF-kB↓, P21↑, Cyc↓, CDK2↓, CDK4/6↓, Snail↓, ChemoSen↑,

Showing Research Papers: 1 to 12 of 12

* indicates research on normal cells as opposed to diseased cells
Total Research Paper Matches: 12

Pathway results for Effect on Cancer / Diseased Cells:


Redox & Oxidative Stress ⓘ

GSH↓, 1,   ROS↑, 3,  

Mitochondria & Bioenergetics ⓘ

CDC25↓, 1,   MMP↓, 2,  

Core Metabolism/Glycolysis ⓘ

FASN↓, 1,   GlucoseCon↓, 1,   PKM2↓, 1,  

Cell Death ⓘ

Akt↓, 3,   p‑Akt↓, 1,   APAF1↑, 2,   Apoptosis↑, 3,   Bak↑, 1,   BAX↑, 3,   BAX∅, 1,   Bax:Bcl2↑, 3,   Bcl-2↓, 5,   Bcl-2∅, 1,   Bcl-xL↓, 2,   Bcl-xL∅, 1,   Casp↑, 3,   Casp3↑, 4,   cl‑Casp3↑, 2,   proCasp3↓, 1,   cl‑Casp7↑, 1,   Casp8↑, 2,   cl‑Casp8↑, 2,   proCasp8↓, 1,   Casp9↑, 1,   cl‑Casp9↑, 1,   proCasp9↓, 1,   CK2↓, 2,   Cyt‑c↑, 4,   cl‑IAP2↑, 1,   p‑JNK↓, 1,   MDM2↓, 1,   p27↑, 1,   survivin↓, 1,   Telomerase↓, 1,  

Kinase & Signal Transduction ⓘ

HER2/EBBR2↓, 1,  

Transcription & Epigenetics ⓘ

ac‑H3↑, 1,   p‑pRB↓, 1,  

Protein Folding & ER Stress ⓘ

CHOP↑, 1,   ER Stress↑, 1,   HSPs↓, 1,  

Autophagy & Lysosomes ⓘ

TumAuto↝, 1,  

DNA Damage & Repair ⓘ

DNAdam↑, 1,   P53↓, 1,   P53↑, 7,   cl‑PARP↑, 4,   PCNA↝, 1,  

Cell Cycle & Senescence ⓘ

CDK1↓, 2,   CDK2↓, 2,   CDK4↓, 1,   Cyc↓, 2,   CycB/CCNB1↓, 2,   cycD1/CCND1↓, 1,   cycE/CCNE↓, 1,   P21↑, 12,   TumCCA↑, 6,  

Proliferation, Differentiation & Cell State ⓘ

cDC2↓, 1,   EMT↓, 1,   ERK↓, 1,   p‑GSK‐3β↓, 1,   HDAC↓, 2,   HDAC1↓, 1,   HDAC3↓, 1,   IGF-1↓, 1,   IGFBP3↑, 1,   mTOR↓, 1,   PI3K↓, 2,   STAT3↓, 1,   p‑STAT3↓, 1,   TumCG↓, 2,   Wnt/(β-catenin)↓, 1,  

Migration ⓘ

AntiAg↑, 1,   Ca+2↑, 2,   cal2↑, 1,   CDK4/6↓, 2,   E-cadherin↑, 1,   FAK↓, 1,   ITGB4↓, 1,   MMPs↓, 1,   Sharpin↓, 1,   Slug↓, 1,   Snail↓, 2,   TumCI↓, 3,   TumCMig↓, 2,   TumCP↓, 2,   TumMeta↓, 1,   β-catenin/ZEB1↓, 1,  

Angiogenesis & Vasculature ⓘ

ATF4↑, 1,   EGFR↓, 1,   Hif1a↓, 3,   VEGF↓, 3,  

Barriers & Transport ⓘ

GLUT1↓, 1,  

Immune & Inflammatory Signaling ⓘ

COX2↓, 1,   p‑JAK2↓, 1,   NF-kB↓, 3,   p65↓, 1,   PSA↓, 2,  

Hormonal & Nuclear Receptors ⓘ

AR↓, 2,  

Drug Metabolism & Resistance ⓘ

ChemoSen↑, 2,   Dose∅, 3,   eff↓, 1,   eff↑, 3,   selectivity↑, 1,  

Clinical Biomarkers ⓘ

AR↓, 2,   EGFR↓, 1,   HER2/EBBR2↓, 1,   PSA↓, 2,  

Functional Outcomes ⓘ

chemoPv↑, 1,   TumVol↓, 3,   TumW↓, 2,  
Total Targets: 113

Pathway results for Effect on Normal Cells:


Cell Death ⓘ

MAPK↓, 1,  

Migration ⓘ

PKCδ↓, 1,  

Immune & Inflammatory Signaling ⓘ

Inflam↓, 1,  

Drug Metabolism & Resistance ⓘ

BioAv↓, 1,   Half-Life∅, 1,  

Functional Outcomes ⓘ

toxicity↓, 1,  
Total Targets: 6

Scientific Paper Hit Count for: P21, P21
12 Apigenin (mainly Parsley)
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#:32  Target#:234  State#:%  Dir#:2
  wNotes=0  sortOrder:rid,rpid

 

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