CUSP9 / OXPHOS Cancer Research Results

CUSP9, CUSP9: Click to Expand ⟱
Features:
CUSP9 coordinated undermining of survival paths with nine repurposed drugs
-includes aprepitant, artesunate, auranofin, captopril, celecoxib, disulfiram, itraconazole, sertraline, ritonavir

CUSP9 — CUSP9 is a coordinated multi-drug repurposing regimen for glioblastoma built around the concept of Coordinated Undermining of Survival Paths. It is a polypharmacologic adjunct oncology protocol rather than a single molecular entity, formally classified as a multi-agent drug-repurposing regimen used with low-dose metronomic temozolomide in the clinically tested CUSP9v3 version. Standard abbreviations include CUSP9, CUSP9*, and CUSP9v3. The regimen originated from the International Initiative for Accelerated Improvement of Glioblastoma Care and subsequent Ulm University clinical development.

Primary mechanisms (ranked):

  1. Multi-pathway blockade of glioblastoma survival, invasion, inflammation, redox adaptation, efflux, and compensatory resistance networks.
  2. Redox stress amplification through thioredoxin reductase inhibition, ALDH inhibition, ROS generation, and impaired detoxification capacity.
  3. Temozolomide augmentation through resistance-pathway suppression, metronomic alkylator pressure, and reduced adaptive escape rather than a single direct chemosensitizing target.
  4. Invasion and microenvironment suppression through angiotensin, MMP, COX-2, microglial, cytokine, and inflammatory axes.
  5. Drug transport and exposure modulation through P-gp, BCRP, CYP, and BBB-relevant pharmacology, with both therapeutic and toxicity implications.
  6. Apoptosis and mitochondrial stress, particularly in CUSP9v3 combinations and in vitro TTFields plus CUSP9v3 experiments.

Bioavailability / PK relevance: CUSP9 is orally administered and highly PK-constrained because it combines multiple approved drugs with different half-lives, CNS penetration, protein binding, hepatic metabolism, and CYP or transporter effects. CUSP9v3 specifically requires careful dose escalation and monitoring because ritonavir, itraconazole, aprepitant, celecoxib, sertraline, and other components create clinically meaningful interaction potential. BBB exposure is component-specific and may not scale linearly with plasma exposure.

In-vitro vs systemic exposure relevance: CUSP9 is concentration-driven, but the clinically relevant question is not the exposure of one drug alone; it is whether simultaneous low-to-moderate exposure across multiple repurposed agents can suppress glioblastoma escape pathways. Some in-vitro work used clinically oriented fixed concentrations, but sensitivity is model-dependent, and lower-order subsets may match or exceed the full nine-drug cocktail in some patient-derived cultures. Translation should therefore treat in-vitro efficacy as supportive, not definitive.

Clinical evidence status: Preclinical rationale is extensive and includes multiple in-vitro glioblastoma and glioma stem-like cell studies. Human evidence is small but real: compassionate-use experience and a phase Ib/IIa recurrent glioblastoma trial support feasibility and tolerability under careful monitoring. Efficacy remains unproven because randomized outcome data are not yet available. CUSP9/CUSP9v3 is not an approved oncology regimen; its components are approved for other indications.

CUSP9 cancer mechanism table

Rank Pathway / Axis Cancer Cells Normal Cells TSF Primary Effect Notes / Interpretation
1 Multi-pathway survival network blockade Parallel GBM survival routes ↓; compensatory escape ↓; heterogeneity buffering ↓ Broad off-target burden possible; toxicity depends on cumulative dose and interactions G Resistance-network suppression Core identity of CUSP9; strongest conceptual rationale is simultaneous weak-to-moderate pressure across many GBM survival axes rather than a dominant single target.
2 Redox detoxification and thioredoxin axis Thioredoxin reductase ↓; ALDH ↓; ROS ↑; apoptotic susceptibility ↑ Redox reserve may be stressed; hepatic and hematologic monitoring relevant R/G Pro-oxidant tumor stress Auranofin and disulfiram are central contributors. This is one of the clearest mechanistic pressure points in CUSP9v3.
3 Temozolomide resistance and chemosensitization Adaptive survival pathways ↓; TMZ escape capacity ↓; alkylator pressure maintained Myelosuppression and cumulative tolerability remain limiting G Adjunct chemosensitization CUSP9v3 was clinically tested with continuous low-dose metronomic temozolomide. Some in-vitro data found limited added benefit from TMZ under specific conditions, so this row is clinically important but mechanistically model-dependent.
4 Invasion and extracellular matrix remodeling MMP-2 ↓; MMP-9 ↓; migration ↓; invasion ↓ Normal inflammatory and wound-remodeling processes may also be affected G Anti-invasive activity Captopril and minocycline in CUSP9v3 are most relevant; original and variant CUSP9 compositions differ, so component-specific interpretation is required.
5 Inflammatory COX and prostaglandin signaling COX-2 ↓; PGE2-linked proliferation and inflammatory support ↓ GI, renal, cardiovascular, and blood pressure risks are clinically relevant G Inflammatory support suppression Celecoxib contributes anti-inflammatory and possible carbonic anhydrase-linked effects, but clinical leverage depends on tolerability and patient risk profile.
6 NK-1 substance P signaling NK-1 signaling ↓; proliferation and pro-survival signaling ↓ Generally tolerable, but CYP interaction context matters G Growth signal suppression Aprepitant is included for NK-1 receptor inhibition and supportive antiemetic pharmacology; its oncology role remains adjunctive and not independently validated as a GBM therapy.
7 Drug efflux and BBB exposure P-gp/BCRP-linked efflux ↓ or altered; intracellular drug exposure may ↑ Systemic drug exposure and interaction risk may ↑ R/G Exposure modulation Itraconazole, ritonavir, and sertraline can alter transporter or CYP-linked exposure. This can be therapeutically useful but is also a major safety constraint.
8 PI3K AKT mTOR and TCTP signaling AKT/mTOR survival tone ↓; TCTP-linked survival signaling ↓ Context-dependent effects on metabolism, mood, and systemic signaling G Growth and survival suppression Sertraline and ritonavir are relevant contributors. This is a secondary but mechanistically meaningful survival-axis target.
9 Hedgehog autophagy and sterol-linked signaling Hedgehog/autophagy programs ↓; adaptive survival ↓ Hepatic toxicity and CYP3A4 interactions are important G Adaptive pathway suppression Itraconazole is a key component, but this axis is limited by drug interaction and hepatic monitoring requirements.
10 Mitochondrial apoptosis and oxidative phosphorylation MOMP ↓; caspase-3 cleavage ↑; Bcl-2/Mcl-1 ↓; OXPHOS ↓ Potential mitochondrial stress is context-dependent R/G Apoptosis promotion Especially supported by recent TTFields plus CUSP9v3 in-vitro work, where combined treatment enhanced apoptosis and reduced respiratory chain activity.
11 Glioma stem-like phenotype and tumor sphere formation Sphere formation ↓; stem-like viability ↓; migration ↓ Normal neural progenitor relevance uncertain G Stem-like compartment suppression Reported in preclinical glioblastoma stem-like models, with heterogeneous response across cultures and possible subtype dependence.
12 Clinical Translation Constraint Potential benefit depends on simultaneous pathway pressure, tumor subtype, and achievable exposure Dose limitation, hepatic enzymes, GI effects, neurologic symptoms, CYP interactions, BBB variability, and adherence burden are major constraints G Feasibility and safety limitation Human evidence supports careful monitored administration, not routine efficacy. The regimen is complex and should be treated as investigational.

TSF legend: P: 0–30 min; R: 30 min–3 hr; G: >3 hr
OXPHOS, Oxidative phosphorylation: Click to Expand ⟱
Source:
Type:
Oxidative phosphorylation (or phosphorylation) is the fourth and final step in cellular respiration.
Alterations in phosphorylation pathways result in serious outcomes in cancer. Many signalling pathways including Tyrosine kinase, MAP kinase, Cadherin-catenin complex, Cyclin-dependent kinase etc. are major players of the cell cycle and deregulation in their phosphorylation-dephosphorylation cascade has been shown to be manifested in the form of various types of cancers.
Many tumors exhibit a well-known metabolic shift known as the Warburg effect, where glycolysis is favored over OxPhos even in the presence of oxygen. However, this is not universal.
Many cancers, including certain subpopulations like cancer stem cells, still rely on OXPHOS for energy production, biosynthesis, and survival.

– In several cancers, especially during metastasis or in tumors with high metabolic plasticity, OxPhos can remain active or even be upregulated to meet energy demands.

In some cancers, high OxPhos activity correlates with aggressive features, resistance to standard therapies, and poor outcomes, particularly when tumor cells exploit mitochondrial metabolism for survival and metastasis.

– Conversely, low OxPhos activity can be associated with a reliance on glycolysis, which is also linked with rapid tumor growth and certain adverse prognostic features.

Inhibiting oxidative phosphorylation is not a universal strategy against all cancers. Targeting OXPHOS can potentially disrupt the metabolic flexibility of cancer cells, leading to their death or making them more susceptible to other treatments.
Since normal cells also rely on OXPHOS, inhibitors must be carefully targeted to avoid significant toxicity to healthy tissues.
Not all tumors are the same. Some may be more glycolytic, while others depend more on mitochondrial metabolism. Therefore, metabolic profiling of tumors is crucial before adopting this strategy. Inhibiting OXPHOS is being explored in combination with other treatments (such as chemo- or immunotherapies) to improve efficacy and overcome resistance.

In cancer cells, metabolic reprogramming is a hallmark where cells often rely on glycolysis (known as the Warburg effect); however, many cancer types also depend on OXPHOS for energy production and survival. Targeting OXPHOS(using inhibitor) to increase the production of reactive oxygen species (ROS) can selectively induce oxidative stress and cell death in cancer cells.

-One side effect of increased OXPHOS is the production of reactive oxygen species (ROS).
-Many cancer cells therefore simultaneously upregulate antioxidant systems to mitigate the damaging effects of elevated ROS.
-Increase in oxidative phosphorylation can inhibit cancer growth.
Scientific Papers found: Click to Expand⟱
6236- CUSP9,  EP,    Tumor Treating Fields (TTFields) combined with the drug repurposing approach CUSP9v3 induce metabolic reprogramming and synergistic anti-glioblastoma activity in vitro
- in-vitro, GBM, U251
Apoptosis↑, MOMP↓, Casp2↑, Bcl-2↓, Mcl-1↓, eff↑, OCR↓, OXPHOS↓, TumCMig↓,

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 ⓘ

OXPHOS↓, 1,  

Mitochondria & Bioenergetics ⓘ

OCR↓, 1,  

Cell Death ⓘ

Apoptosis↑, 1,   Bcl-2↓, 1,   Casp2↑, 1,   Mcl-1↓, 1,   MOMP↓, 1,  

Migration ⓘ

TumCMig↓, 1,  

Drug Metabolism & Resistance ⓘ

eff↑, 1,  
Total Targets: 9

Pathway results for Effect on Normal Cells:


Total Targets: 0

Scientific Paper Hit Count for: OXPHOS, Oxidative phosphorylation
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#:296  Target#:230  State#:%  Dir#:1
  wNotes=0  sortOrder:rid,rpid

 

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