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| 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)
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| Glutathione (GSH) is a thiol antioxidant that scavenges reactive oxygen species (ROS), resulting in the formation of oxidized glutathione (GSSG). Decreased amounts of GSH and a decreased GSH/GSSG ratio in tissues are biomarkers of oxidative stress. Glutathione is a powerful antioxidant found in every cell of the body, composed of three amino acids: cysteine, glutamine, and glycine. It plays a crucial role in protecting cells from oxidative stress, detoxifying harmful substances, and supporting the immune system. cancer cells can have elevated levels of glutathione, which may help them survive in the oxidative environment created by the immune response and chemotherapy. This can make cancer cells more resistant to treatment. While glutathione can be obtained from certain foods (like fruits, vegetables, and meats), its absorption from supplements is debated. Some people take N-acetylcysteine (NAC) or other precursors to boost glutathione levels, but the effects on cancer prevention or treatment are still being studied. Depleting glutathione (GSH) to raise reactive oxygen species (ROS) is a strategy that has been explored in cancer research and therapy. Many cancer cells have altered redox states and may rely on GSH to survive. Increasing ROS levels can induce stress in these cells, potentially leading to cell death. Certain drugs and compounds can deplete GSH levels. For example, agents like buthionine sulfoximine (BSO) inhibit the synthesis of GSH, leading to its depletion. Cancer cells tend to exhibit higher levels of intracellular GSH, possibly as an adaptive response to a higher metabolism and thus higher steady-state levels of reactive oxygen species (ROS). "...intracellular glutathione (GSH) exhibits an astounding antioxidant activity in scavenging reactive oxygen species (ROS)..." "Cancer cells have a high level of GSH compared to normal cells." "...cancer cells are affluent with high antioxidant levels, especially with GSH, whose appearance at an elevated concentration of ∼10 mM (10 times less in normal cells) detoxifies the cancer cells." "Therefore, GSH depletion can be assumed to be the key strategy to amplify the oxidative stress in cancer cells, enhancing the destruction of cancer cells by fruitful cancer therapy." The loss of GSH is broadly known to be directly related to the apoptosis progression. |
| 1765- | PG, | Enhanced cell death effects of MAP kinase inhibitors in propyl gallate-treated lung cancer cells are related to increased ROS levels and GSH depletion |
| - | in-vitro, | Lung, | A549 | - | in-vitro, | Lung, | Calu-6 |
| 1767- | PG, | Propyl gallate induces cell death in human pulmonary fibroblast through increasing reactive oxygen species levels and depleting glutathione |
| - | in-vitro, | Nor, | NA |
| 1769- | PG, | The Anti-Apoptotic Effects of Caspase Inhibitors in Propyl Gallate-Treated Lung Cancer Cells Are Related to Changes in Reactive Oxygen Species and Glutathione Levels |
| - | in-vitro, | Lung, | Calu-6 | - | in-vitro, | Lung, | A549 |
| 1772- | PG, | Propyl gallate decreases the proliferation of Calu-6 and A549 lung cancer cells via affecting reactive oxygen species and glutathione levels |
| - | in-vitro, | Lung, | Calu-6 | - | in-vitro, | Lung, | A549 |
| 5217- | PG, | Role of redox signaling regulation in propyl gallate-induced apoptosis of human leukemia cells |
| - | in-vitro, | AML, | THP1 | - | in-vitro, | AML, | Jurkat | - | in-vitro, | AML, | HL-60 |
| 5218- | PG, | Propyl gallate inhibits hepatocellular carcinoma cell growth through the induction of ROS and the activation of autophagy |
| - | in-vitro, | HCC, | Hep3B |
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
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