Selenium / selenoP Cancer Research Results

Se, Selenium: Click to Expand ⟱
Features: micronutrient
Naturally occurring element. Selenium is incorporated into selenoproteins, such as glutathione peroxidases (GPxs) and thioredoxin reductases (TrxRs), which play critical roles in protecting cells from oxidative damage.
Involved in GPx, TrxR, ans Selenoprotien P which protect normal cells from oxidative stress.
Important in Thyroid hormone metabolism, immune system regulation, reproductive health, and Brain and heart protection.

-recommended daily allowance (RDA) for selenium is about 55 µg/day for adults. (upper tolerance 400ug/day)
-One Brazil nut may contain 50-300ug/nut

Sodium selenite (Na₂SeO₃) is a selenium compound with well-documented anticancer and chemopreventive properties
-Oxidation state: +4 (selenite form of selenium)
-Type: Inorganic selenium compound (water-soluble)

-Sodium selenite generates reactive oxygen species (ROS) selectively in tumor cells.
-Induces cytochrome c release, caspase-3 activation, and DNA fragmentation.
-Reduces VEGF expression and endothelial cell migration.
-Blocks cell division at G2/M phase
-Suppresses MMP-2 and MMP-9 activity
-Activates p53
-Inhibits NF-κB
-PI3K/Akt/mTOR Suppression
-Inactivation of Thioredoxin/Glutathione systems
-NRF2 inhibition in cancer cell might be connected with O2 level

Narrow therapeutic window:
-Low micromolar (≤5 µM) → anticancer
-High (>10 µM) → toxic to normal cells

Some Selenium Supplements use Sodium Selenite as the active ingredient.
- NOW Foods Selenium, Nature's Bounty Selenium, etc

Other common form is Selenomethionine, as it is better absorbed (found in brazil nuts), but might be less effective?
| Category                             | Role in cancer                                                                                  |
| -------------------------------- | ----------------------------------------------------------------------------------------------- |
| Sodium Selenium (selenite)       | Direct cytotoxic redox poison                                                                   |
| Selenium (organic / nutritional) | **Redox buffer & immune modulator** (generally *anti-therapy* when oxidative stress is desired) |
| SeNPs                            | Tunable redox-signaling anticancer platform                                                     |

Selenium (Organic / Nutritional) — Cancer-Relevant Pathways
Rank Pathway / Target Axis Direction Primary Effect Notes / Cancer Relevance Ref
1 Selenoprotein antioxidant systems (GPX1–4, TXNRD) ↑ antioxidant capacity ROS buffering Dietary selenium increases glutathione peroxidase and thioredoxin reductase activity, lowering oxidative stress (ref)
2 Glutathione redox cycling (GSH/GSSG) ↑ GSH recycling Redox homeostasis Selenium supports GPX-mediated peroxide detoxification and preserves cellular GSH pools (ref)
3 Ferroptosis suppression (GPX4 axis) ↓ ferroptosis susceptibility Lipid peroxide detoxification GPX4 is a selenoprotein; adequate selenium suppresses lipid peroxidation and ferroptotic death (ref)
4 NRF2 antioxidant response ↔ / ↑ (supportive) Stress adaptation Selenium status influences NRF2 target gene expression indirectly via redox tone (ref)
5 DNA damage prevention / repair environment ↓ oxidative DNA damage Genomic stability Selenium sufficiency reduces oxidative DNA lesions and supports repair capacity (ref)
6 p53 redox regulation ↔ stabilized (context-dependent) Checkpoint fidelity Redox balance maintained by selenium supports normal p53 signaling rather than triggering apoptosis (ref)
7 NF-κB inflammatory signaling ↓ chronic activation Anti-inflammatory bias Selenium supplementation suppresses NF-κB activation under inflammatory/oxidative conditions (ref)
8 Immune competence (T-cell, NK-cell function) ↑ immune function Improved immune surveillance Selenium supports cytotoxic lymphocyte activity and cytokine balance (ref)
9 Angiogenesis signaling (VEGF) ↔ / mild ↓ Vascular normalization Nutritional selenium does not strongly inhibit angiogenesis but may modestly reduce VEGF under stress (ref)
10 PI3K–AKT survival signaling ↔ (homeostatic) Cell survival maintenance Unlike selenite or SeNPs, organic selenium does not directly suppress PI3K–AKT at nutritional doses (ref)
11 Autophagy (baseline maintenance) ↔ Cellular homeostasis Selenium supports basal autophagy via redox balance but does not drive cytotoxic autophagy (ref)
12 Cancer risk modulation (epidemiologic) ↓ risk in deficient populations Prevention (not treatment) Protective effects are context-dependent; excess selenium may be neutral or adverse in replete populations (ref)


selenoP, selenoproteins: Click to Expand ⟱
Source:
Type:
Selenoproteins are a group of proteins that incorporate the rare amino acid selenocysteine into their structure. Selenocysteine, sometimes called the “21st amino acid,” is encoded by the UGA codon in a unique context that requires specific translational machinery. Many selenoproteins are known for their antioxidant and redox-regulatory functions, which are critical in maintaining cellular homeostasis. These functions help protect cells from oxidative stress and damage—processes that, when dysregulated, can contribute to carcinogenesis.

Roles of Selenoproteins in Cancer.
1. Antioxidant Defense & Redox Regulation
-Glutathione Peroxidases (GPxs): Enzymes like GPX1, GPX2, and GPX3 reduce hydrogen peroxide and lipid hydroperoxides. This protects cells against oxidative DNA damage.
-Thioredoxin Reductases (TXNRDs): TXNRD1, TXNRD2, and TXNRD3 help maintain the reduced state of thioredoxin, thereby contributing to redox homeostasis and cell survival under stress.

2. Cellular Proliferation and Apoptosis -Selenoproteins may modulate signaling pathways that regulate cell cycle progression and apoptosis. Variations in expression levels—either upregulation or downregulation—can tip the balance toward uncontrolled cell growth or cell death.

The expression of selenoproteins in cancers is complex and can vary by tumor type. Here are some examples:

Glutathione Peroxidases (GPxs)
-GPX1: Both overexpression and underexpression have been reported depending on the tumor context. In some cases, high GPX1 expression can help cancer cells survive oxidative stress.
-GPX2: Often upregulated in colorectal cancer and some GC, poor prognosis.
-GPX3: Typically downregulated in many cancers with tumor progression and poor outcome, suggesting its role as a tumor suppressor.

Thioredoxin Reductases (TXNRDs)
-TXNRD1: Frequently overexpressed in various tumors such as lung, breast, and liver cancers.
High TXNRD1 levels are generally associated with a poor prognosis.
-SELENOP (Selenoprotein P) SELENOP serves as a selenium transport protein and has antioxidant properties. Decreased SELENOP expression has been linked to poorer outcomes in some cancers, possibly due to reduced selenium availability for other protective selenoproteins.

Other Selenoproteins
-SELENOF and SELENOS:
-SELENOM and SELENOK:
Scientific Papers found: Click to Expand⟱
4613- Se,  Rad,    Effect of Selenium and Selenoproteins on Radiation Resistance
- Review, Nor, NA
*selenoP↑, *GPx1↑, *GPx4↑, *lipid-P↓, *DNAdam↓, *ROS↓, *radioP↑,
4712- Se,    Selenium and selenoproteins: key regulators of ferroptosis and therapeutic targets in cancer
- Review, Var, NA
selenoP↑, Ferroptosis↑, lipid-P↑,
4717- Se,    A systematic review of Selenium as a complementary treatment in cancer patients
- Review, Var, NA
*antiOx↑, eff↝, radioP↑, chemoP↑, *selenoP↑, *GPx↑, TrxR↑, *ROS↓,
4724- Se,    Chapter Four - Selenium in the Redox Regulation of the Nrf2 and the Wnt Pathway
- Review, Var, NA
Risk↓, *selenoP↑, other↝, Risk↓,
4492- Se,    Selenium in cancer prevention: a review of the evidence and mechanism of action
- Review, Var, NA
Risk↓, AntiCan↑, *selenoP↑, TumMeta↓, *DNAdam↓, OS↑, *ROS↓,
4485- Se,    Selenium stimulates the antitumour immunity: Insights to future research
- Review, NA, NA
*antiOx↑, chemoPv↑, ROS↑, Imm↑, selenoP↑, *IL2↑, *IL4↑, *TNF-α↓, *TGF-β↓, *EMT↓, Risk↓, *GPx↑, *TrxR↑,

Showing Research Papers: 1 to 6 of 6

* indicates research on normal cells as opposed to diseased cells
Total Research Paper Matches: 6

Pathway results for Effect on Cancer / Diseased Cells:


Redox & Oxidative Stress ⓘ

Ferroptosis↑, 1,   lipid-P↑, 1,   ROS↑, 1,   selenoP↑, 2,   TrxR↑, 1,  

Cell Death ⓘ

Ferroptosis↑, 1,  

Transcription & Epigenetics ⓘ

other↝, 1,  

Migration ⓘ

TumMeta↓, 1,  

Immune & Inflammatory Signaling ⓘ

Imm↑, 1,  

Drug Metabolism & Resistance ⓘ

eff↝, 1,  

Functional Outcomes ⓘ

AntiCan↑, 1,   chemoP↑, 1,   chemoPv↑, 1,   OS↑, 1,   radioP↑, 1,   Risk↓, 4,  
Total Targets: 16

Pathway results for Effect on Normal Cells:


Redox & Oxidative Stress ⓘ

antiOx↑, 2,   GPx↑, 2,   GPx1↑, 1,   GPx4↑, 1,   lipid-P↓, 1,   ROS↓, 3,   selenoP↑, 4,   TrxR↑, 1,  

DNA Damage & Repair ⓘ

DNAdam↓, 2,  

Proliferation, Differentiation & Cell State ⓘ

EMT↓, 1,  

Migration ⓘ

TGF-β↓, 1,  

Immune & Inflammatory Signaling ⓘ

IL2↑, 1,   IL4↑, 1,   TNF-α↓, 1,  

Functional Outcomes ⓘ

radioP↑, 1,  
Total Targets: 15

Scientific Paper Hit Count for: selenoP, selenoproteins
6 Selenium
1 Radiotherapy/Radiation
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#:149  Target#:1172  State#:%  Dir#:2
  wNotes=0  sortOrder:rid,rpid

 

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