Propyl gallate / SOD Cancer Research Results

PG, Propyl gallate: Click to Expand ⟱
Features:
An ester formed by the condensation of gallic acid and propanol.
Propyl gallate (PG), chemically known as propyl-3,4,5-trihydroxybenzoate, is widely present in processed food and cosmetics, hair products, and lubricants.
PG alone demonstrated antioxidative and cytoprotective properties against cellular damage and gained a pro-oxidative property in combination with copper (II). It was reported that PG was one of the most active compounds capable of generating H2O2 in DMEM media
Main cancer-relevant pathways modulated by propyl gallate
A. Redox imbalance & oxidative stress (dominant)
-↑ Intracellular ROS (context- and dose-dependent)
  -Pro-oxidant in cancer cells with high basal ROS
  -Mitochondrial superoxide accumulation
  -Thiol depletion (↓ GSH, ↓ Trx buffering capacity)
Importance: ★★★★★  (Primary mechanism)

B. Mitochondrial dysfunction & intrinsic apoptosis
-↑ MOMP → caspase cascade
  -Loss of mitochondrial membrane potential (ΔΨm)
  -Cytochrome-c release
  -Caspase-9 → caspase-3 activation
  -↑ Bax / ↓ Bcl-2 ratio
Importance: ★★★★☆

C. ER stress & unfolded protein response (UPR)
-↑ PERK–eIF2α–ATF4–CHOP
  -ROS-linked protein misfolding
  -Pro-apoptotic UPR signaling dominates over adaptive UPR
Importance: ★★★☆☆

D. Cell cycle disruption
-G1 or G2/M arrest (cell-type dependent)
  -↓ Cyclin D1, Cyclin B1
  -↑ p21, p27
Importance: ★★☆☆☆

E. MAPK stress signaling
-↑ JNK / p38
  -Stress-activated apoptosis signaling
  -Often precedes mitochondrial failure
Importance: ★★☆☆☆

F. Inflammation & survival pathways (secondary)
-↓ NF-κB, ↓ STAT3 (indirect)
  -Suppression is largely ROS-mediated, not direct inhibition
  -Reduced anti-apoptotic gene transcription
Importance: ★★☆☆☆

G. NRF2–ARE signaling (dual role)
-Low dose: NRF2 activation → cytoprotection
  -High dose / cancer cells: NRF2 overwhelmed → apoptosis
Importance: ★★☆☆☆
(Highly context dependent; double-edged)
Rank Pathway / Target Axis Direction Primary Effect Notes / Cancer Relevance Ref
1 Glutathione (GSH) redox buffering ↓ GSH (depletion) Upstream redox vulnerability Leukemia and HeLa models report GSH depletion as an early, causal event in PG-induced cytotoxicity (ref)
2 Nrf2 antioxidant-response axis ↓ Nrf2 nuclear translocation → ↓ γ-GCS Impaired antioxidant capacity PG inhibits Nrf2 nuclear translocation and downstream glutathione-synthesis control, linking to GSH depletion and apoptosis in leukemia cells (ref)
3 Reactive oxygen species (ROS) balance (context-dependent) ↑ ROS (tumor models) / ↓ ROS (TMZ-combo migration model) Oxidative-stress modulation PG increases ROS in hepatocellular carcinoma (HCC) with autophagy/apoptosis; in TMZ-treated glioma, PG inhibits TMZ-induced ROS linked to reduced migration (ref)
4 MAPK stress signaling (ERK/JNK/p38) ↑ MAPK activation Stress-to-death signaling PG activates MAPKs; authors position MAPKs/Nrf2-mediated GSH depletion as an early driver of apoptosis (ref)
5 Autophagy program (LC3 conversion) ↑ autophagy Stress response contributing to growth inhibition HCC study: PG induces ROS and activates autophagy (LC3-I→LC3-II), with associated apoptosis markers (ref)
6 Apoptosis (caspase cascade; intrinsic/extrinsic components) ↑ caspase activation / ↑ apoptosis Programmed cell death Leukemia: caspases-3/8/9 activation with p53/Bax/Fas/FasL changes; lung cancer: caspase-dependent apoptosis with PARP cleavage (ref)
7 Cell-cycle regulation ↑ G1 arrest (e.g., ↑ p27) Proliferation blockade HeLa and lung cancer models report PG-induced G1 phase arrest with cell-cycle regulator changes (ref)
8 Lung cancer growth suppression ↓ proliferation / ↓ viability Anti-growth effect PG reduces growth of Calu-6 and A549 lung cancer cells with G1 arrest and caspase-dependent apoptosis (ref)
9 Migration / invasion phenotype (TMZ-combination glioma model) ↓ migration (via ↓ TMZ-induced ROS; NF-κB pathway implicated in full paper title) Anti-migratory effect (combination context) TMZ + PG enhances inhibition of U87MG glioma migration; abstract states PG inhibits TMZ-induced ROS and implicates mitochondrial complex III / NADPH oxidase as ROS sources (ref)
10 In vivo anti-tumor effect (HCC; zebrafish model) ↓ tumor growth / ↓ proliferation Demonstrated in vivo activity HCC study includes in vivo suppression (zebrafish) alongside ROS increase and autophagy activation (ref)


SOD, superoxide dismutase: Click to Expand ⟱
Source:
Type:
SOD, or superoxide dismutase, is an important antioxidant enzyme that plays a crucial role in protecting cells from oxidative stress. It catalyzes the dismutation of superoxide radicals into oxygen and hydrogen peroxide.
SOD Isoforms: There are three main isoforms of SOD:
SOD1 (cytosolic): Often found to be overexpressed in certain tumors, which may help cancer cells survive in oxidative environments.
SOD2 (mitochondrial): Plays a critical role in protecting mitochondria from oxidative damage. Its expression can be upregulated in some cancers, contributing to tumor growth and resistance to therapy.
SOD3 (extracellular): Its role in cancer is less well understood, but it may have implications in the tumor microenvironment and metastasis.
The expression levels of SOD can serve as a prognostic indicator in some cancers. For example, high levels of SOD expression have been associated with poor prognosis in certain types of tumors, potentially due to their role in promoting tumor cell survival and resistance to therapies.
Scientific Papers found: Click to Expand⟱
1767- PG,    Propyl gallate induces cell death in human pulmonary fibroblast through increasing reactive oxygen species levels and depleting glutathione
- in-vitro, Nor, NA
*ROS↑, *GSH↓, *SOD↓, *Catalase↓, eff↓,

Showing Research Papers: 1 to 1 of 1

* indicates research on normal cells as opposed to diseased cells
Total Research Paper Matches: 1

Pathway results for Effect on Cancer / Diseased Cells:


Drug Metabolism & Resistance ⓘ

eff↓, 1,  
Total Targets: 1

Pathway results for Effect on Normal Cells:


Redox & Oxidative Stress ⓘ

Catalase↓, 1,   GSH↓, 1,   ROS↑, 1,   SOD↓, 1,  
Total Targets: 4

Scientific Paper Hit Count for: SOD, superoxide dismutase
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#:138  Target#:298  State#:%  Dir#:1
  wNotes=0  sortOrder:rid,rpid

 

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