| Rank |
Pathway / Target Axis |
Direction |
Primary Effect |
Notes / Cancer Relevance |
Ref |
| 1 |
Redox cycling with thiols (superoxide generation) |
↑ O2•− / ↑ ROS |
Acute oxidative stress |
Defines sodium selenite anticancer mechanism in many models: early superoxide rise precedes mitochondrial apoptotic events |
(ref) |
| 2 |
Glutathione buffering (GSH pool) |
↓ GSH |
Loss of redox buffering |
Work in hepatoma models demonstrates GSH’s key role in selenite-driven oxidative stress and apoptosis |
(ref) |
| 3 |
Mitochondrial integrity (ΔΨm) |
↓ ΔΨm |
Mitochondrial dysfunction |
Sequential mechanism shown: superoxide rise → mitochondrial depolarization |
(ref) |
| 4 |
Intrinsic apoptosis (cytochrome c → Caspase-9/3) |
↑ cytochrome c release / ↑ Caspase-9/3 |
Programmed cell death |
Same sequential model shows cytochrome c release followed by caspase-9 and caspase-3 activation |
(ref) |
| 5 |
ER stress / UPR (PERK → eIF2α → ATF4) |
↑ PERK/eIF2α/ATF4 |
Proteotoxic stress signaling |
ER-stress module is shown as a core driver in selenite-induced autophagy→apoptosis progression |
(ref) |
| 6 |
Stress MAPK (p38) as switch control |
↑ p38 activation |
Signal switching (autophagy → apoptosis) |
Mechanistic evidence for p38 participating in the selenite-driven transition toward apoptosis |
(ref) |
| 7 |
p53 activation (stress response) |
↑ p53 phosphorylation (Ser15) |
Facilitates apoptosis programs |
NB4 leukemia model: selenite induces p53 Ser15 phosphorylation via p38/ERK in the autophagy–apoptosis switch context |
(ref) |
| 8 |
DNA damage response (ATM-dependent signaling) |
↑ ATM-dependent DDR |
Checkpoint activation & death signaling |
Selenium compounds (including selenite contexts) activate ATM-dependent DNA damage response signaling in colorectal cancer models |
(ref) |
| 9 |
PI3K–AKT axis linked to autophagy/apoptosis balance |
↓ PI3K/Akt (functional axis) / ↓ protective autophagy |
Apoptosis sensitization |
NB4 leukemia: sodium selenite increases apoptosis by autophagy inhibition through PI3K/Akt |
(ref) |
| 10 |
NF-κB signaling |
↓ NF-κB |
Reduced anti-apoptotic transcription |
Mechanistic study: sodium selenite induces ROS-mediated inhibition of NF-κB with downstream shift toward apoptosis |
(ref) |
| 11 |
Angiogenesis signaling (VEGF) |
↓ VEGF expression |
Reduced vascular support signals |
Prostate cancer PC3 model: sodium selenite inhibits expression of VEGF (and related inflammatory/pro-growth factors) in the tested context |
(ref) |
| 12 |
Ferroptosis (iron-dependent oxidative death) |
↑ ferroptosis |
Non-apoptotic oxidative death modality |
Paper explicitly reports sodium selenite as an inducer of ferroptosis across multiple human cancer cell types |
(ref) |
| Dimension |
Sodium Selenite (Na2SeO3) |
Selenium Nanoparticles (SeNPs) |
Selenomethionine / Se-Yeast |
| Primary mechanistic class |
Direct redox-disrupting agent |
Controlled redox modulator / signaling perturbator |
Nutritional selenium reservoir / selenoprotein precursor |
| Initial molecular interaction |
Rapid reaction with cellular thiols (GSH, Trx, protein –SH) |
Cellular uptake → gradual selenium release or surface redox effects |
Nonspecific incorporation into proteins in place of methionine |
| ROS generation |
↑↑ acute, non-buffered ROS burst |
↑ mild–moderate, sustained ROS |
↓ or ↔ (antioxidant bias) |
| Glutathione (GSH) system |
↓↓ GSH depletion |
↔ or mild ↓ (context-dependent) |
↑ GSH recycling via GPX support |
| Redox selectivity (cancer vs normal) |
Limited; toxicity threshold close to efficacy |
Improved tumor selectivity window |
Poor for cancer killing; favors normal-cell protection |
| Mitochondrial integrity (ΔΨm) |
↓↓ rapid depolarization |
↓ gradual, dose-dependent disruption |
↔ or ↑ mitochondrial protection |
| Dominant cell-death pathways |
Intrinsic apoptosis ± necrosis (high dose) |
Apoptosis ± ferroptosis ± autophagy-related death |
None (cytoprotective) |
| ER stress / UPR (PERK–CHOP) |
↑ strong, early activation |
↑ moderate, delayed activation |
↓ ER stress via antioxidant capacity |
| DNA damage response |
↑ oxidative DNA lesions (ATM/ATR) |
↑ low–moderate, secondary to ROS |
↓ DNA damage; improved repair environment |
| PI3K–AKT survival signaling |
↓ secondary to oxidative collapse |
↓ reported in multiple tumor models |
↔ or ↑ survival signaling |
| NF-κB / inflammatory signaling |
↓ via redox inhibition |
↓ selectively; anti-inflammatory bias |
↓ chronic inflammation (protective) |
| Ferroptosis involvement |
Minor / indirect |
↑ lipid peroxidation; GPX4 modulation |
↓↓ ferroptosis risk (GPX4 support) |
| Autophagy |
↑ early (protective) → collapse |
↑ contributory to tumor suppression |
↔ homeostatic maintenance |
| Angiogenesis (VEGF) |
↓ at cytotoxic doses |
↓ at lower, tolerated doses |
↔ or mild ↓ (indirect) |
| Immune compatibility |
Poor at anticancer doses |
Moderate–good; often immune-supportive |
High; supports immune competence |
| Pharmacologic control |
Poor (steep dose–toxicity curve) |
High (size, coating, release tunable) |
Low (slow turnover, storage form) |
| Normal tissue tolerance |
Low |
Moderate–high |
High |
| Overall cancer relevance |
Potent but hazardous cytotoxic agent |
Balanced anticancer redox modulator |
Generally counterproductive for direct cancer killing |
| Overall therapeutic profile |
Potent but narrow safety margin |
Lower acute potency, broader usable window |