Ajoene (compound of Garlic) / selectivity Cancer Research Results

Ajoene, Ajoene (compound of Garlic): Click to Expand ⟱
Features:
Ajoene is a compound found in garlic, specifically in the oil extracted from crushed garlic cloves. It has been studied for its potential anti-cancer properties. Research suggests that ajoene may have several mechanisms by which it can inhibit the growth of cancer cells and induce apoptosis (cell death).

Ajoene — an organosulfur secondary metabolite formed from garlic (Allium sativum) after crushing/processing (an allicin-derived transformation product; typically present as E/Z isomers). It is a thiol-reactive small molecule (vinyl-disulfide sulfoxide motif) studied mainly as a cytotoxic/anti-migratory agent in cancer models and as a topical antifungal. Classification: small-molecule natural product (garlic organosulfur compound). Abbreviation(s): none universally standard; often specified as E-ajoene / Z-ajoene.

Primary mechanisms (ranked):

  1. Protein cysteine modification (S-thiolation / covalent adduct formation on thiol-containing targets), with downstream disruption of signaling and cytoskeletal programs
  2. Pro-oxidant stress in cancer cells (ROS/H2O2 increase, redox-thiol perturbation) that can trigger intrinsic mitochondrial apoptosis
  3. Cell-cycle perturbation (commonly G2/M arrest) and microtubule/cytoskeletal interference (model-dependent; isomer-dependent)
  4. Anti-migration/anti-invasion phenotypes linked to intermediate filament (vimentin) network remodeling (context-dependent)
  5. Secondary: NRF2-driven antioxidant response induction in some non-malignant/epithelial contexts (dose- and context-dependent)

Bioavailability / PK relevance: Systemic human PK is poorly defined; ajoene is typically discussed as an allicin-derived downstream product and allicin itself is not detected in human serum after raw garlic ingestion in classic studies. Practical translation in oncology is therefore most credible for local/topical exposure or for optimized analogues; oral dietary exposure may not reproduce common in-vitro micromolar conditions reliably.

In-vitro vs systemic exposure relevance: Many anticancer studies use ~low–tens of µM in vitro; whether these levels are achievable systemically from diet/supplements is uncertain. Topical delivery can reach higher local concentrations (e.g., skin lesions/fungal infections), and small human topical studies exist.

Clinical evidence status: Predominantly preclinical (cell culture and animal models). Small human topical evidence exists for basal cell carcinoma tumor shrinkage and for fungal skin infections (e.g., tinea pedis; chromoblastomycosis). No robust systemic oncology RCT evidence.

Approximate ajoene content values for different parts of the garlic plant:
Garlic bulbs: 1-5 mg of ajoene per clove
Garlic scapes (green shoots): 0.5-2 mg of ajoene per 100g
Garlic chives (leaves): 0.5-2 mg of ajoene per 100g
Garlic microgreens: 1-5 mg of ajoene per 100g

μM concentrations of ajoene that have been reported to exhibit biological activity:
Antimicrobial activity: 1-10 μM
Antioxidant activity: 1-50 μM
Anti-inflammatory activity: 5-20 μM
Anticancer activity: 10-50 μM
Cardiovascular health: 5-20 μM

Approximate unverified μM concentrations of ajoene that can be achieved with different amounts of garlic or garlic chives:
1 clove of garlic (3g): approximately 1-5 μM of ajoene
1 tablespoon of minced garlic (15g): approximately 5-15 μM of ajoene
1 cup of chopped garlic (100g): approximately 30-60 μM of ajoene
1 tablespoon of chopped garlic chives (15g): approximately 0.5-2 μM of ajoene
1 cup of chopped garlic chives (100g): approximately 5-10 μM of ajoene
1 ounce (28g) of garlic microgreens: approximately 10-30 μM of ajoene
1 cup of garlic microgreens (100g): approximately 30-60 μM of ajoene
1 ounce (28g) of garlic chive microgreens: approximately 5-15 μM of ajoene
1 cup of garlic chive microgreens (100g): approximately 15-30 μM of ajoene

Ajoene — mechanistic axes relevant to oncology translation

Rank Pathway / Axis Cancer Cells Normal Cells TSF Primary Effect Notes / Interpretation
1 Protein thiol reactivity and covalent cysteine targeting ↑ thiol stress; ↑ protein adducts (model-dependent) ↔ to ↑ adaptive antioxidant response (context-dependent) P/R Upstream “initiator” chemistry that can rewire multiple pathways Consistent with ajoene acting as a thiol-reactive electrophile; downstream effects vary by target set and exposure.
2 ROS and peroxide signaling ↑ ROS/H2O2 (dose-dependent); ↑ oxidative damage (high concentration only) ↔ or ↑ cytoprotective programs (dose-dependent) P Oxidative stress–linked cytotoxicity in susceptible cancer models Classic leukemia data show apoptosis accompanied by ROS and NF-κB activation; magnitude and direction can be model- and dose-dependent.
3 Mitochondria and intrinsic apoptosis ↑ mitochondrial apoptosis; ↑ caspase cascade (model-dependent) ↔ (selectivity reported in some systems) R/G Execution of cell death following redox/thiol perturbation Topical basal cell carcinoma (BCC) work supports mitochondria-dependent apoptosis signaling in vivo/ex vivo.
4 NF-κB signaling ↑ NF-κB activity (model-dependent) ↔ P/R Stress-response transcriptional program NF-κB activation can be pro-survival or pro-death depending on context; in some ajoene models it co-occurs with apoptosis rather than preventing it.
5 Cell cycle control and microtubule/cytoskeleton dynamics ↑ G2/M arrest (model-dependent); ↓ proliferation ↔ R/G Anti-proliferative cytostasis/cytotoxicity Reported links include microtubule interference and mitotic blockade; may vary by isomer and cellular background.
6 Invasion and migration and vimentin intermediate filaments ↓ invasion/migration (requires vimentin); ↑ vimentin remodeling (context-dependent) ↔ G Anti-metastatic phenotype in vitro Non-cytotoxic ajoene concentrations can remodel vimentin networks and suppress invasion/migration in vimentin-positive models.
7 NRF2 antioxidant response (secondary) ↔ to ↑ NRF2 targets (context-dependent) ↑ NRF2-driven cytoprotection (context-dependent) R/G Adaptive redox buffering Ajoene can activate NRF2 and induce glutathione-related enzymes in hepatic/epithelial models; this may oppose pro-oxidant cytotoxicity at lower stress levels.
8 Chemosensitization ↑ apoptosis with chemotherapy (model-dependent) Unknown R/G Potential adjunct effect Reported in leukemia models (including more resistant compartments) but not established clinically for systemic cancer therapy.
9 Clinical Translation Constraint Systemic exposure likely limited/variable from diet; many in-vitro studies use µM levels; isomer mixture and chemical stability complicate reproducibility; best-supported human data are topical (skin/fungal indications). Safety constraint: antiplatelet activity raises bleeding-risk concerns with anticoagulants/antiplatelets. — Feasibility boundary Translation most plausible for topical/local delivery or for engineered analogues with validated blood stability and exposure.


selectivity, selectivity: Click to Expand ⟱
Source:
Type:
The selectivity of cancer products (such as chemotherapeutic agents, targeted therapies, immunotherapies, and novel cancer drugs) refers to their ability to affect cancer cells preferentially over normal, healthy cells. High selectivity is important because it can lead to better patient outcomes by reducing side effects and minimizing damage to normal tissues.

Achieving high selectivity in cancer treatment is crucial for improving patient outcomes. It relies on pinpointing molecular differences between cancerous and normal cells, designing drugs or delivery systems that exploit these differences, and overcoming intrinsic challenges like tumor heterogeneity and resistance

Factors that affect selectivity:
1. Ability of Cancer cells to preferentially absorb a product/drug
-EPR-enhanced permeability and retention of cancer cells
-nanoparticle formations/carriers may target cancer cells over normal cells
-Liposomal formations. Also negatively/positively charged affects absorbtion

2. Product/drug effect may be different for normal vs cancer cells
- hypoxia
- transition metal content levels (iron/copper) change probability of fenton reaction.
- pH levels
- antiOxidant levels and defense levels

3. Bio-availability
Scientific Papers found: Click to Expand⟱
5340- Ajoene,    Ajoene, a compound of garlic, induces apoptosis in human promyeloleukemic cells, accompanied by generation of reactive oxygen species and activation of nuclear factor kappaB
- in-vitro, AML, NA
Apoptosis↑, selectivity↑, H2O2↑, NF-kB↑,

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:


Redox & Oxidative Stress ⓘ

H2O2↑, 1,  

Cell Death ⓘ

Apoptosis↑, 1,  

Immune & Inflammatory Signaling ⓘ

NF-kB↑, 1,  

Drug Metabolism & Resistance ⓘ

selectivity↑, 1,  
Total Targets: 4

Pathway results for Effect on Normal Cells:


Total Targets: 0

Scientific Paper Hit Count for: selectivity, selectivity
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#:196  Target#:1110  State#:%  Dir#:2
  wNotes=0  sortOrder:rid,rpid

 

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