Auranofin / Prx Cancer Research Results

AF, Auranofin: Click to Expand ⟱
Features:

Auranofin — an orally administered gold(I) coordination complex (gold–phosphine–thiolate “thiosugar” drug) originally approved as a disease-modifying antirheumatic drug (DMARD) for rheumatoid arthritis and widely studied for repurposing as a redox-targeted anticancer and anti-infective agent. It is a small-molecule metallodrug whose pharmacology is typically tracked via blood/plasma gold concentrations because intact auranofin is rapidly transformed and not reliably detected in blood. Standard abbreviation(s): AF (auranofin); primary target shorthand: TrxR/TxNRD (thioredoxin reductase).

Primary mechanisms (ranked):

  1. Thioredoxin reductase (TXNRD1/TXNRD2; TrxR) inhibition by gold(I) → thioredoxin system suppression and loss of redox-buffering capacity
  2. ROS and redox stress escalation (secondary to TrxR blockade; often NAC-reversible in models) → apoptosis and other regulated death programs
  3. Mitochondrial dysfunction (Δψm collapse, bioenergetic stress) coupled to redox imbalance
  4. Proteostasis stress (ER stress/UPR; proteasome involvement in selected contexts) → non-apoptotic death phenotypes (model-dependent)
  5. Ferroptosis contribution in subsets of models (lipid peroxidation–dependent; context-dependent)
  6. Radiosensitization / chemosensitization via impaired antioxidant recovery and enhanced oxidative injury (context-dependent)
  7. Stress-response transcription (e.g., NRF2 activation as an adaptive resistance program in some settings; protective in normal cells)

Bioavailability / PK relevance: Oral absorption is incomplete; clinical PK is commonly described as ~25% of the gold content absorbed. Gold is highly protein-bound and exhibits prolonged retention/long terminal half-life, so effective exposure depends strongly on dose and dosing duration. Because “gold levels” are the main measurable surrogate, cross-study comparisons should specify matrix (whole blood vs plasma) and timing (steady-state vs short course).

In-vitro vs systemic exposure relevance: Many oncology cell studies use ~0.5–5 µM AF. Human short-course data at 6 mg/day for 7 days report plasma gold on the order of ~0.1–0.3 µg/mL (roughly sub-µM to ~1–1.5 µM range when expressed as gold equivalents), meaning lower in-vitro ranges can overlap clinically observed exposure surrogates, while higher µM regimens may exceed typical oral exposures unless higher doses/longer courses or formulation changes are used.

Clinical evidence status: Approved for rheumatoid arthritis (historical DMARD use) but oncology use remains investigational. Multiple early-phase repurposing trials exist across hematologic and solid tumors; several completed studies have limited publicly posted outcomes, and there is no established standard-of-care anticancer indication.


Pathways:
1.Thioredoxin Reductase (TrxR) Inhibition.
- Most widely recognized for potently inhibiting TrxR.
2.Induction of Reactive Oxygen Species (ROS) and Oxidative Stress.
3.MMP depolarization, release of cytochrome c
4.Endoplasmic Reticulum (ER) Stress and Unfolded Protein Response (UPR)
5.Inhibition of Pro-survival Pathways (e.g., NF-κB Signaling)

-ic50 for cancer typically 1-3uM, normal cell 5-10uM or higher.
-Several studies animal testing antitumor efficacy have used doses in the region of 5–8 mg/kg via intraperitoneal injection or oral administration.

-Auranofin’s anticancer activity is often linked to its inhibition of thioredoxin reductase, leading to increased oxidative stress.

Mechanistic axes for Auranofin (Cancer vs Normal)

Rank Pathway / Axis Cancer Cells Normal Cells TSF Primary Effect Notes / Interpretation
1 TXNRD1 TXNRD2 Thioredoxin system ↓ (primary) ↓ (primary) P→R Collapse of thioredoxin redox buffering Core, proximal target of AF; downstream effects track with redox reserve and compensatory antioxidant capacity rather than tumor lineage alone.
2 ROS redox stress ↑ (often primary downstream) ↑ (dose-dependent) P→R Oxidative injury signaling and death pathway engagement Frequently reversible with thiol antioxidants (e.g., NAC) in models, supporting causality; magnitude depends on baseline redox fragility.
3 Mitochondria bioenergetics Δψm ↓, ATP stress ↑ (context-dependent) Δψm ↓ (dose-dependent) R Energetic crisis and intrinsic death susceptibility Often coupled to redox imbalance; can amplify apoptosis/regulated necrosis depending on cellular checkpoints.
4 Proteostasis ER stress UPR ↑ (model-dependent) ↔/↑ (high exposure only) R→G Protein-folding overload and non-apoptotic death phenotypes Some reports implicate proteasome participation and paraptosis-like outcomes; not universal across tumor types.
5 NRF2 antioxidant response ↑ (adaptive; resistance role) ↑ (cytoprotective) R→G Transcriptional compensation to redox stress NRF2 induction can blunt AF efficacy in tumors yet protect normal tissues; net effect is (context-dependent).
6 Ferroptosis lipid peroxidation ↑ (model-dependent) ↔/↑ (stress-prone contexts) R→G Regulated death component in subsets Most consistent when AF-driven redox stress converges on lipid ROS handling; requires model-specific validation.
7 Radiosensitization chemosensitization ↑ sensitivity (context-dependent) ↑ toxicity risk (context-dependent) R→G Impaired antioxidant recovery increases treatment injury Mechanistically coherent with TrxR blockade; best supported where oxidative damage markers and combination indices are shown.
8 Ca²⁺ stress coupling ↑/↔ (secondary) ↑/↔ (secondary) R Amplifies ER mitochondrial death signaling Usually downstream of redox + organelle perturbation; include when Ca²⁺-dependent apoptosis/ER stress is explicitly demonstrated.
9 Glycolysis ATP production ↓ (context-dependent) ↔/↓ (high exposure only) R Metabolic stress that can reduce proliferative fitness Reported in some models; may be secondary to mitochondrial/redox disruption rather than a primary binding target.
10 HIF-1α hypoxia programs ↔ (model-dependent) ↔ G Context marker rather than core axis Evaluate case-by-case; AF’s primary leverage is redox enzyme inhibition, with HIF effects emerging indirectly in some systems.
11 Clinical Translation Constraint ↔ ↔ — Exposure, tolerability, and selectivity limit window Oral absorption is incomplete and gold is long-retained/protein-bound; many oncology studies rely on µM in-vitro dosing that may exceed typical oral exposure surrogates. Oncology trials exist but anticancer efficacy is not established as standard-of-care.

TSF legend: P: 0–30 min | R: 30 min–3 hr | G: >3 hr
Prx, Peroxiredoxin: Click to Expand ⟱
Source:
Type:
also known as Prx
Peroxiredoxins are endogenous antioxidants and redox sensors. Properties of the peroxiredoxins make them suitable as markers of oxidative stress.
Peroxiredoxins (Prxs) are a family of antioxidant enzymes that play a crucial role in cellular redox signaling and the detoxification of reactive oxygen species (ROS). They are involved in various cellular processes, including cell proliferation, differentiation, and apoptosis.
Prx isoforms (such as Prx1 and Prx4) are often overexpressed. This overexpression can help cancer cells cope with increased levels of reactive oxygen species (ROS) generated during rapid cell division and metabolic changes.
Elevated Prx levels have been linked to resistance against chemotherapy and radiation therapy. For example, Prx2 and Prx3 have been implicated in protecting cancer cells from oxidative damage caused by these treatments.
Some Prxs, such as Prx3, can act as tumor suppressors. Their downregulation or loss of function has been associated with increased tumorigenesis and poor prognosis in certain cancers.

PRDX family comprises several isoforms (for example, PRDX1, PRDX2, PRDX3, etc.) that function as antioxidant enzymes to reduce reactive oxygen species (ROS) and maintain redox balance.

PRDX family—especially key isoforms like PRDX1 and PRDX2—are often upregulated in various cancers, correlating with worse prognosis and enhanced tumor cell survival. Through their ROS-detoxifying capabilities, these proteins generally play protumorigenic roles by protecting malignant cells from oxidative stress and supporting resistance to apoptosis and therapy.


Scientific Papers found: Click to Expand⟱
5470- AF,    Exploring a Therapeutic Gold Mine: The Antifungal Potential of the Gold-Based Antirheumatic Drug Auranofin
- Review, Var, NA
TrxR↓, other↝, IL6↑, IL8↑, NK cell⇅, COX2↓, NOS2↓, NRF2↑, Prx↑, Half-Life↑, Dose↝, ROS↑, 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 ⓘ

NRF2↑, 1,   Prx↑, 1,   ROS↑, 1,   TrxR↓, 1,  

Transcription & Epigenetics ⓘ

other↝, 1,  

Immune & Inflammatory Signaling ⓘ

COX2↓, 1,   IL6↑, 1,   IL8↑, 1,   NF-kB↓, 1,   NK cell⇅, 1,  

Drug Metabolism & Resistance ⓘ

Dose↝, 1,   Half-Life↑, 1,  

Clinical Biomarkers ⓘ

IL6↑, 1,   NOS2↓, 1,  
Total Targets: 14

Pathway results for Effect on Normal Cells:


Total Targets: 0

Scientific Paper Hit Count for: Prx, Peroxiredoxin
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#:273  Target#:263  State#:%  Dir#:%
  wNotes=0  sortOrder:rid,rpid

 

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