Hydroxycinnamic-acid / PKM2 Cancer Research Results

HCAs, Hydroxycinnamic-acid: Click to Expand ⟱
Features:
Hydroxycinnamic acid compounds (p-coumaric, caffeic acid (CA), ferulic acid) occur most frequently as simple esters with hydroxy carboxylic acids or glucose, while the hydroxybenzoic acid compounds (p-hydroxybenzoic, gallic acid, ellagic acid) are present mainly in the form of glucosides. https://www.sciencedirect.com/topics/chemistry/hydroxycinnamic-acid
Hydroxycinnamic acids (HCAs) are plant-derived phenolic acids (including caffeic, ferulic, p-coumaric, and sinapic acids) with documented antioxidant, anti-inflammatory (NF-κB↓), and context-dependent anticancer effects in cellular and preclinical models. Mechanistic themes include activation of the Nrf2/ARE antioxidant response, suppression of pro-inflammatory and survival pathways (such as NF-κB and PI3K/AKT), modulation of MAPK signaling, and downstream effects on cell-cycle, apoptosis, invasion, and angiogenesis. Oral exposure is influenced by rapid metabolism (phase II conjugates) and food matrix effects, which affects systemic bioavailability and translational relevance. Biological effects vary by specific hydroxycinnamic derivative and its conjugated/esterified form. (Caffeic acid ≠ ferulic acid ≠ sinapic acid)

-Ferulic acid and p‐coumaric acid are naturally occurring hydroxycinnamic acids found in many plant-based foods (such as whole grains, fruits, and vegetables)

CA showed pro-oxidant potential due to its ability to interact with metals like copper, inducing lipid peroxidation and causing DNA damage within tumor cells through either oxidation or covalent adduct formation.

Summary:
-HCAs are classically antioxidant
-Such as caffeic acid, ferulic acid, and sinapic acid (SA)
-May increase sensitivity to chemotherapy
-Bioavailability is problem. Formulation strategies (e.g., liposomal or encapsulated forms) are investigated to improve systemic exposure.
-Propolis has caffeic acid (Caffeic acid (0.639–4.172 mg/g propolis)
-SA at higher concentrations may acts as a potent pro-oxidant agent
-SA may act in collaboration with other chemotherapeutic agents to improve treatment sensitivity. -Co-administration of caffeic acid or CAPE with other anti-tumor compounds (e.g., gallic acid) has shown additive or synergistic effects in selected models
-Combination of caffeic acid and endogenous copper ions can result in oxidative damage
-Ferulic Acid (abundant in whole grains,popcorn): upregulate apoptotic protein and downregulate anti-apoptotic protein.upregulating (BAX), (p53), (CYCS) and downregulating (Bcl-2),

Rank Pathway / Axis Cancer Cells Normal Cells TSF Primary Effect Notes / Interpretation
1 Nrf2/ARE antioxidant response (Keap1-Nrf2-HO-1) Stress adaptation modulation (context-dependent) Nrf2 ↑; HO-1 & GSH systems ↑ R, G Endogenous antioxidant upshift Hydroxycinnamic acids commonly promote Nrf2 nuclear translocation and elevate antioxidant defense enzymes; this is one of the most consistent in vivo correlates.
2 NF-κB inflammatory transcription NF-κB ↓; pro-inflammatory cytokine programs ↓ (reported) Inflammation tone ↓; protective in injury models R, G Anti-inflammatory signaling Hydroxycinnamic acids are widely reported to reduce NF-κB activity and downstream cytokine expression across inflammation and tumor models.
3 ROS / oxidative stress modulation Oxidative stress ↓ (often); ROS direction variable Oxidative injury ↓ in stress models P, R, G Redox buffering (context-dependent) These acids are generally antioxidant, but in certain cancer models or at higher concentrations they may affect redox dynamics differentially.
4 Cell-cycle checkpoints (Cyclin D1/CDK4/6; checkpoints) Cell-cycle arrest ↑ (reported); Cyclin/CDKs ↓ ↔ G Cytostasis Largely late phenotype outcome linked to signaling changes.
5 Apoptosis (intrinsic/mitochondrial & caspase-linked) Apoptosis ↑; caspase activation ↑ (reported) ↔ (less activation in normal contexts) G Cell death execution Dependent on model and oxidative stress context; not as “direct” as classical mitochondrial toxins.
6 MAPK re-wiring (ERK / JNK / p38) MAPK modulation (context-dependent) ↔ P, R, G Signal reprogramming Directions vary by tissue, stress levels, and derivative; avoid fixed arrows for all MAPKs unless model-specific evidence is provided.
7 PI3K → AKT (± mTOR) survival axis PI3K/AKT modulation (reported) ↔ R, G Survival/growth modulation Often reported as downstream of NF-κB suppression and redox buffering.
8 Invasion / metastasis programs (MMPs / EMT) MMPs ↓; migration-invasion ↓ (reported) ↔ G Anti-invasive phenotype Observed as downstream phenotypes; direction depends on specific hydroxycinnamic acid derivative.
9 Angiogenesis signaling (VEGF & angiogenic outputs) VEGF ↓; angiogenesis markers ↓ (reported) ↔ G Anti-angiogenic support Later phenotype marker; linked to reduced pro-inflammatory and survival signaling.
10 Bioavailability / metabolism constraint (conjugation; food matrix dependence) Systemic exposure variable; rapid conjugation — — Translation constraint Hydroxycinnamic acids are absorbed but rapidly metabolized (phase II conjugates); food matrix alters bioaccessibility and systemic exposure.

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

  • P: 0–30 min (primary/rapid effects; early redox interactions)
  • R: 30 min–3 hr (acute stress-response + transcription signaling shifts)
  • G: >3 hr (gene-regulatory adaptation and phenotype-level outcomes)
PKM2, Pyruvate Kinase, Muscle 2: Click to Expand ⟱
Source:
Type: enzyme
PKM2 (Pyruvate Kinase, Muscle 2) is an enzyme that plays a crucial role in glycolysis, the process by which cells convert glucose into energy. PKM2 is a key regulatory enzyme in the glycolytic pathway, and it is primarily expressed in various tissues, including muscle, brain, and cancer cells.
-C-myc is a common oncogene that enhances aerobic glycolysis in the cancer cells by transcriptionally activating GLUT1, HK2, PKM2 and LDH-A
-PKM2 has been shown to be overexpressed in many types of tumors, including breast, lung, and colon cancer. This overexpression may contribute to the development and progression of cancer by promoting glycolysis and energy production in cancer cells.
-inhibition of PKM2 may cause ATP depletion and inhibiting glycolysis.
-PK exists in four isoforms: PKM1, PKM2, PKR, and PKL
-PKM2 plays a role in the regulation of glucose metabolism in diabetes.
-PKM2 is involved in the regulation of cell proliferation, apoptosis, and autophagy.
– Pyruvate kinase catalyzes the final, rate-limiting step of glycolysis, converting phosphoenolpyruvate (PEP) to pyruvate with the production of ATP.
– The PKM2 isoform is uniquely regulated and can exist in both highly active tetrameric and less active dimeric forms.
– Cancer cells often favor the dimeric form of PKM2 to slow pyruvate production, thereby accumulating upstream glycolytic intermediates that can be diverted into anabolic pathways to support cell growth and proliferation.
– Under low oxygen conditions, cancer cells rely on altered metabolic pathways in which PKM2 is a key player. – The shift to aerobic glycolysis (Warburg effect) orchestrated in part by PKM2 helps tumor cells survive and grow in hypoxic conditions.

– Elevated expression of PKM2 is frequently observed in many cancer types, including lung, breast, colorectal, and pancreatic cancers.
– High levels of PKM2 are often correlated with enhanced tumor aggressiveness, poor differentiation, and advanced clinical stage.

PKM2 in carcinogenesis and oncotherapy

Inhibitors of PKM2:
-Shikonin, Resveratrol, Baicalein, EGCG, Apigenin, Curcumin, Ursolic Acid, Citrate (best known as an allosteric inhibitor of phosphofructokinase-1 (PFK-1), a key rate-limiting enzyme in glycolysis) potential to directly inhibit or modulate PKM2 is less well established

Full List of PKM2 inhibitors from Database
-key connected observations: Glycolysis↓, lactateProd↓, ROS↑ in cancer cell, while some result for opposite effect on normal cells.
Tumor pyruvate kinase M2 modulators

Flavonoids effect on PKM2
Compounds name IC50/AC50uM Effect
Flavonols
1. Fisetin 0.90uM Inhibition
2. Rutin 7.80uM Inhibition
3. Galangin 8.27uM Inhibition
4. Quercetin 9.24uM Inhibition
5. Kaempferol 9.88uM Inhibition
6. Morin hydrate 37.20uM Inhibition
7. Myricetin 0.51uM Activation
8. Quercetin 3-b- D-glucoside 1.34uM Activation
9. Quercetin 3-D -galactoside 27-107uM Ineffective
Flavanons
10. Neoeriocitrin 0.65uM Inhibition
11. Neohesperidin 14.20uM Inhibition
12. Naringin 16.60uM Inhibition
13. Hesperidin 17.30uM Inhibition
14. Hesperitin 29.10uM Inhibition
15. Naringenin 70.80uM Activation
Flavanonols
16. (-)-Catechin gallateuM 0.85 Inhibition
17. (±)-Taxifolin 1.16uM Inhibition
18. (-)-Epicatechin 1.33uM Inhibition
19. (+)-Gallocatechin 4-16uM Ineffective
Phenolic acids
20. Ferulic 11.4uM Inhibition
21. Syringic and 13.8uM Inhibition
22. Caffeic acid 36.3uM Inhibition
23. 3,4-Dihydroxybenzoic acid 78.7uM Inhibition
24. Gallic acid 332.6uM Inhibition
25. Shikimic acid 990uM Inhibition
26. p-Coumaric acid 22.2uM Activation
27. Sinapinic acids 26.2uM Activation
28. Vanillic 607.9uM Activation


Scientific Papers found: Click to Expand⟱
2400- HCAs,    The Mixture of Ferulic Acid and P-Coumaric Acid Suppresses Colorectal Cancer through lncRNA 495810/PKM2 Mediated Aerobic Glycolysis
- in-vitro, CRC, NA - in-vivo, CRC, NA
PKM2↓, Glycolysis↓, TumCG↓,
2407- HCAs,    2'-hydroxycinnamaldehyde inhibits cancer cell proliferation and tumor growth by targeting the pyruvate kinase M2
- in-vitro, Pca, DU145 - in-vitro, Pca, LNCaP
p‑PKM2↓, TumCG↓,

Showing Research Papers: 1 to 2 of 2

* indicates research on normal cells as opposed to diseased cells
Total Research Paper Matches: 2

Pathway results for Effect on Cancer / Diseased Cells:


Core Metabolism/Glycolysis ⓘ

Glycolysis↓, 1,   PKM2↓, 1,   p‑PKM2↓, 1,  

Proliferation, Differentiation & Cell State ⓘ

TumCG↓, 2,  
Total Targets: 4

Pathway results for Effect on Normal Cells:


Total Targets: 0

Scientific Paper Hit Count for: PKM2, Pyruvate Kinase, Muscle 2
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#:95  Target#:772  State#:%  Dir#:1
  wNotes=0  sortOrder:rid,rpid

 

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