diet Methionine-Restricted Diet / RadioS Cancer Research Results

dietMet, diet Methionine-Restricted Diet: Click to Expand ⟱
Features:
Methionine (MET) restriction (MR) has been shown to arrest cancer growth and sensitizes tumors to chemotherapy.
-Many cancer cells rely heavily on exogenous methionine to sustain rapid growth and proliferation because they often have impaired methionine salvage pathways.
-Methionine contributes to the synthesis of glutathione, a key antioxidant. (Methionine is a precursor of glutathione, a tripeptide that reduces reactive oxygen species.)
-MR diets might influence the redox state of cancer cells, increasing oxidative stress and thereby leading to cell death in metabolically compromised tumor cells.
-Proliferation and growth of several types of cancer cells are inhibited by MR, while normal cells are unaffected by limiting methionine as long as homocysteine is present.
-Methionine restriction is effective when the non-essential amino acid, cysteine, is absent from the diet or media. methionine is the precursor for cysteine which is essential for the formation of GSH.
-Malignant cells lack the enzyme required to recycle homocysteine therefore giving methionine restriction the capacity to alter cancer cells while maintaining normal, healthy cells.

While vegan diets are typically low in methionine, some nuts and legumes (such as Brazil nuts and kidney beans) are rich in methionine.

Foods to avoid for MR diet:
Animal Proteins:
-Red Meat (Beef, Pork, Lamb):
-Poultry (Chicken, Turkey):
-Fish and Seafood:
-Eggs: Both the egg whites and yolks are protein rich.
-Dairy Products: Milk, cheese, and yogurt
Certain Plant Proteins:
-Soy Products:
-Legumes:
Protein Supplements:

Foods Lower in Methionine (Often Favorable on an MR Diet)
Fruits & Vegetables: leafy greens, berries, apples, and citrus fruits.
Grains & Cereals: rice, oats, and barley
Nuts and Seeds: can vary in methionine content.
Alternative Protein Sources: emphasize protein sources with a lower methionine-to-cysteine ratio.

Rank Pathway / Target Axis Direction Primary Effect Notes / Cancer Relevance Ref
1 One-carbon metabolism (methionine cycle → folate cycle coupling) ↓ one-carbon flux (Met/SAM-linked metabolites) Core metabolic constraint Nature study shows dietary MR produces controlled, reproducible changes to one-carbon metabolism that alter cancer outcomes (ref)
2 Nucleotide biosynthesis (purines/thymidylate via one-carbon units) ↓ nucleotide synthesis capacity DNA/RNA synthesis limitation Same MR Nature paper links MR-driven one-carbon changes to pathways needed for proliferation and therapy response (ref)
3 Therapy sensitivity (chemo / targeted one-carbon therapy synergy) ↑ sensitivity / ↑ efficacy Therapeutic potentiation Dietary MR influences outcomes and can enhance responses to standard therapies through one-carbon metabolic rewiring (ref)
4 mTORC1 nutrient sensing (Met/SAM → SAMTOR mechanism) ↓ mTORC1 signaling when Met/SAM low Reduced anabolic growth signaling Mechanistic review: SAMTOR senses SAM (derived from methionine) and, when SAM is low, inhibits mTORC1 signaling (ref)
5 Integrated Stress Response (ISR; ATF4 induction under MR) ↑ ISR / ↑ ATF4 Amino-acid stress adaptation MR activates ISR in TNBC cells (eIF2α phosphorylation; ATF4 and targets up), demonstrating stress signaling engagement under methionine restriction (ref)
6 Glutathione (GSH) / ferroptosis coupling (CHAC1 axis) ↑ CHAC1 / ↓ GSH / ↑ ferroptosis (context-dependent) Redox vulnerability Intermittent dietary methionine deprivation augments tumoral ferroptosis; paper links effect to CHAC1 upregulation (CHAC1 promotes GSH degradation) (ref)
7 Epigenetic methylation capacity (SAM-dependent methylation) ↓ methylation potential (via ↓ SAM availability) Altered gene regulation Review focused on dietary methionine and cancer: MR impacts SAM-dependent methylation processes central to biosynthesis/regulation in tumors (ref)
8 Systemic growth signaling (IGF-1) ↓ IGF-1 Lower systemic pro-growth cue Intermittent MR reduces circulating IGF-1 (healthspan paper, but the endocrine direction is explicit and relevant to tumor growth biology) (ref)
9 Radiation sensitization (clinical feasibility context) ↑ RT sensitivity (preclinical); feasible in humans Translational evidence Phase I pilot: MR diet given concurrently with radiation—supports feasibility/safety; paper states preclinical evidence of MRD sensitizing cancer to RT (ref)
10 In vivo tumor growth ↓ tumor growth / ↓ progression (model-dependent) Demonstrated anti-tumor effect Nature MR paper demonstrates MR can influence tumor outcomes in mouse cancer models (ref)


RadioS, RadioSensitizer: Click to Expand ⟱
Source:
Type:
A radiosensitizer is an agent that makes cancer cells more sensitive to the damaging effects of radiation therapy. By using a radiosensitizer, clinicians aim to enhance the effectiveness of radiation treatment by either increasing the damage incurred by tumor cells or by interfering with the cancer cells’ repair mechanisms. This can potentially allow for lower doses of radiation, reduced side effects, or improved treatment outcomes.
Pathways that help Radiosensitivity: downregulating HIF-1α, increase SIRT1, Txr

List of Natural Products with radiosensitizing properties:
-Curcumin:modulate NF-κB, STAT3 and has been shown in preclinical studies to enhance the effects of radiation by inhibiting cell survival pathways.
-Resveratrol:
-EGCG:
-Quercetin:
-Genistein:
-Parthenolide:

How radiosensitizers inhibit the thioredoxin (Trx) system in cellular contexts. Notable radiosensitizers, including:
-gold nanoparticles (GNPs),
-gold triethylphosphine cyanide ([Au(SCN) (PEt3)]),
-auranofin, ceria nanoparticles (CONPs),
-curcumin and its derivatives,
-piperlongamide,
-indolequinone derivatives,
-micheliolide,
-motexafin gadolinium, and
-ethane selenide selenidazole derivatives (SeDs)
Scientific Papers found: Click to Expand⟱
5191- dietMet,    Intermittent dietary methionine deprivation facilitates tumoral ferroptosis and synergizes with checkpoint blockade
- in-vitro, Colon, HT29
ChemoSen↑, RadioS↑, Ferroptosis↑, eff↑, eff↑, GSH↓, eff↓,
5188- dietMet,    Dietary methionine links nutrition and metabolism to the efficacy of cancer therapies
- in-vivo, Var, NA
AntiAge↑, MethCyc↓, TumCG↓, ChemoSen↑, RadioS↑, OS↑, GSH↓,
2264- dietMet,    Methionine restriction for cancer therapy: From preclinical studies to clinical trials
- Review, Var, NA
TumCP↓, *ROS?, ChemoSen↑, RadioS↑, eff↑, ROS↑, selectivity↑, TS↓, eff↑,
2263- dietMet,    Methionine Restriction and Cancer Biology
- Review, Var, NA
AntiCan↑, TumCP↓, TumCG↓, selectivity↑, ChemoSen↓, RadioS↑, Insulin↓, *GlucoseCon↑, *ROS↓, *antiOx↑, *GSH↑, GSH↑, eff↑, polyA↓, TS↓, Raf↓, Akt↓, Casp9↑, Bak↑, P21↑, p27↑, Insulin↓, IGF-1↓,
1897- dietMet,    Methionine metabolism in health and cancer: a nexus of diet and precision medicine
- Review, Var, NA
OS↑, TumCG↓, TumCCA↑, ChemoSen↑, RadioS↑,
1896- dietMet,    Dietary methionine links nutrition and metabolism to the efficacy of cancer therapies
- in-vivo, CRC, NA
TumCG↓, *GSH↓, RadioS↑, eff↑,

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,   GSH↓, 2,   GSH↑, 1,   ROS↑, 1,  

Mitochondria & Bioenergetics ⓘ

Insulin↓, 2,   Raf↓, 1,  

Core Metabolism/Glycolysis ⓘ

MethCyc↓, 1,   polyA↓, 1,   TS↓, 2,  

Cell Death ⓘ

Akt↓, 1,   Bak↑, 1,   Casp9↑, 1,   Ferroptosis↑, 1,   p27↑, 1,  

Cell Cycle & Senescence ⓘ

P21↑, 1,   TumCCA↑, 1,  

Proliferation, Differentiation & Cell State ⓘ

IGF-1↓, 1,   TumCG↓, 4,  

Migration ⓘ

TumCP↓, 2,  

Drug Metabolism & Resistance ⓘ

ChemoSen↓, 1,   ChemoSen↑, 4,   eff↓, 1,   eff↑, 6,   RadioS↑, 6,   selectivity↑, 2,  

Functional Outcomes ⓘ

AntiAge↑, 1,   AntiCan↑, 1,   OS↑, 2,  
Total Targets: 28

Pathway results for Effect on Normal Cells:


Redox & Oxidative Stress ⓘ

antiOx↑, 1,   GSH↓, 1,   GSH↑, 1,   ROS?, 1,   ROS↓, 1,  

Core Metabolism/Glycolysis ⓘ

GlucoseCon↑, 1,  
Total Targets: 6

Scientific Paper Hit Count for: RadioS, RadioSensitizer
6 diet Methionine-Restricted Diet
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#:292  Target#:1107  State#:%  Dir#:2
  wNotes=0  sortOrder:rid,rpid

 

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