Niclosamide (Niclocide) / pH Cancer Research Results

NCL, Niclosamide (Niclocide): Click to Expand ⟱
Features:

Niclosamide (brand: Niclocide; NIC) — salicylanilide anthelmintic (tapeworm drug) being investigated for drug repurposing in oncology due to multi-pathway signaling inhibition and mitochondrial/energy-stress effects. Sources: Rx/essential-medicines antiparasitic; multiple repurposing reviews.

Primary mechanisms (conceptual rank):
1) Mitochondrial energy disruption (uncoupling / ATP depletion; AMPK-linked energy stress)
2) Wnt/β-catenin inhibition (LRP6/β-catenin axis; stemness/CSC phenotypes)
3) STAT3 inhibition (anti-survival transcription)
4) mTORC1 suppression (growth/anabolism ↓; autophagy context)
5) NF-κB / Notch modulation (context-dependent; anti-inflammatory/anti-survival)

Bioavailability / PK relevance: Poor solubility and low/variable oral systemic exposure are major constraints; formulation work (e.g., solution approaches) is used to improve reproducibility/systemic availability.

In-vitro vs oral exposure: Many anticancer effects are observed at concentrations that can exceed typical systemic exposure from standard oral dosing (qualifier: high concentration only for direct tumor cytotoxicity in many models).

Clinical evidence status: Approved antiparasitic; oncology remains preclinical + early/small human repurposing studies (no established oncology RCT approval/indication).

Niclosamide (Niclocide) — Cancer vs Normal Cell Pathway Map

Rank Pathway / Axis Cancer Cells Normal Cells TSF Primary Effect Notes / Interpretation
1 Mitochondrial energy metabolism (OXPHOS uncoupling / ATP) ↓ ATP (primary; dose-dependent) ↓ ATP (high concentration only) P/R Energy stress → growth inhibition Core pharmacology includes mitochondrial/energy disruption; can trigger downstream stress signaling.
2 Wnt/β-catenin (LRP6/β-catenin; CSC/stemness) ↓ (model-dependent) ↔ R/G Reduced proliferation / stemness programs Frequently highlighted in repurposing; relevant in Wnt-driven or CSC-enriched contexts.
3 STAT3 ↓ ↔ R/G Anti-survival transcription blockade Often positioned as a central anti-tumor axis and combination-sensitization mechanism.
4 mTORC1 / growth-anabolism ↓ ↔ / ↓ (stress-dependent) R/G Reduced anabolic signaling Frequently co-reported with Wnt/STAT3 inhibition; can couple to autophagy responses.
5 AMPK (energy-stress sensor) ↑ (context-dependent) ↑ (stress-dependent) R Catabolic shift / growth suppression Often downstream of ATP depletion; can antagonize mTORC1 signaling.
6 NF-κB ↓ (context-dependent) ↓ (context-dependent) R/G Reduced inflammatory / survival programs Not always dominant; varies by model and inflammatory dependence.
7 Notch ↓ (model-dependent) ↔ G Differentiation / stemness modulation Reported in repurposing literature; often secondary to broader stress/signaling effects.
8 ROS ↑ (dose-dependent) ↔ / ↑ (high concentration only) P/R Oxidative stress contribution Can be downstream of mitochondrial disruption; may contribute to cytotoxicity or resistance depending on context.
9 NRF2 (protective vs resistance role) ↔ / ↑ (adaptive; context-dependent) ↔ / ↑ (adaptive) R/G Stress-response adjustment Typically secondary; may reduce sensitivity if antioxidant adaptation dominates.
10 Autophagy ↑ or ↓ (context-dependent) ↔ / ↑ (stress-dependent) R/G Stress adaptation vs cell-death coupling Often described as a stress-response phenotype; can be cytostatic or pro-death depending on tumor context.
11 Ca²⁺ signaling ↔ (stress-related) ↔ P/R No primary axis Not a canonical primary target; include only if a specific model shows ER/mitochondrial Ca²⁺ disruption.
12 Clinical Translation Constraint ↓ (constraint) ↓ (constraint) — Exposure variability + formulation dependence Poor solubility/low systemic exposure and high variability with oral dosing drive repurposing limitations; solution/formulation approaches aim to increase systemic availability.

TSF legend: P: 0–30 min; R: 30 min–3 hr; G: >3 hr
pH, Intracellular pH / Intracellular Acidification(opposite): Click to Expand ⟱
Source:
Type:
Tumor Microenvironment: Cancer cells often thrive in a more acidic environment compared to normal cells. This is partly due to the metabolic processes of cancer cells, which can produce lactic acid and other acidic byproducts. The acidic microenvironment can promote tumor growth and invasion.
Many tumors exhibit an acidic microenvironment. This is largely due to the high rate of glycolysis (often referred to as the Warburg effect), even in the presence of oxygen, leading to lactate production. Acidification is thought to promote invasion, metastasis, and resistance to certain chemotherapies.
The body maintains a relatively stable pH in the blood (around 7.4). However, the pH of tissues can vary, and tumors can exhibit a lower pH.

-Normal tissues have a higher extracellular pH than intracellular pH, in cancer is exactly the opposite. (inversion of the pH gradient).

Cancer cells often overexpress proton pumps (such as V-ATPase) and transporters that actively extrude protons (H⁺) to maintain an intracellular pH conducive to their growth.
Inhibiting these pumps can lead to intracellular acidification and potentially induce apoptosis or render cancer cells more vulnerable to other treatments.
Normal pH levels in the body:
Nasal: ~6.3 pH
Mouth/saliva: 6.2-7.6 pH
Stomach: 1-3 pH
Small Intestine: 5.9-6.8 pH
Colon/Large Intestine: 6.8-7 pH

Intracellular pH - Intracellular Acidification / Cytosolic pH

Abbreviation: pHi

Type: Cellular physiological phenotype / metabolic state / acid-base homeostasis

Function: Intracellular pH regulates enzyme activity, metabolism, ion transport, protein function, cell-cycle progression, proliferation, apoptosis, and cellular stress responses. Intracellular pH is controlled by transporters and enzymes including NHE1, monocarboxylate transporters, bicarbonate transporters, carbonic anhydrases, and proton pumps.

Cancer: ↑ Intracellular pH is commonly elevated in cancer cells relative to normal cells and supports proliferation, glycolysis, survival, migration, and resistance to apoptosis. Cancer cells often maintain a relatively alkaline cytosol while producing an acidic extracellular tumor microenvironment.

Favorable Direction in Cancer Treatment: ↓ Intracellular pH / ↑ intracellular acidification can suppress proliferation and promote cellular stress and apoptosis. Sustained treatment-induced intracellular acidification is therefore commonly interpreted as a favorable anticancer effect.
Scientific Papers found: Click to Expand⟱
5253- NCL,    Niclosamide: Beyond an antihelminthic drug
- Review, Var, NA
TumCP↓, Apoptosis↑, EMT↓, β-catenin/ZEB1↓, TumCG↓, toxicity↓, Wnt↓, LRP6↓, eff↑, DR5↑, mTORC1↓, pH↓, CSCs↓, IL6↓, JAK1↓, STAT3↓, ChemoSen↑, TumCG↓, tumCV↓, NOTCH↓, NF-kB↓, EGFR↓, ROS↑, RadioS↑, cFos↓, cJun↓, E2Fs↓, cMyc↓, Half-Life↓, BioAv↝,

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(tgid=1) ⓘ

ROS↑, 1,  

Core Metabolism/Glycolysis(tgid=4) ⓘ

cMyc↓, 1,  

Cell Death(tgid=5) ⓘ

Apoptosis↑, 1,   DR5↑, 1,  

Transcription & Epigenetics(tgid=7) ⓘ

cJun↓, 1,   tumCV↓, 1,  

Cell Cycle & Senescence(tgid=11) ⓘ

E2Fs↓, 1,  

Proliferation, Differentiation & Cell State(tgid=12) ⓘ

cFos↓, 1,   CSCs↓, 1,   EMT↓, 1,   LRP6↓, 1,   mTORC1↓, 1,   NOTCH↓, 1,   STAT3↓, 1,   TumCG↓, 2,   Wnt↓, 1,  

Migration(tgid=13) ⓘ

TumCP↓, 1,   β-catenin/ZEB1↓, 1,  

Angiogenesis & Vasculature(tgid=14) ⓘ

EGFR↓, 1,  

Immune & Inflammatory Signaling(tgid=16) ⓘ

IL6↓, 1,   JAK1↓, 1,   NF-kB↓, 1,  

Cellular Microenvironment(tgid=17) ⓘ

pH↓, 1,  

Drug Metabolism & Resistance(tgid=21) ⓘ

BioAv↝, 1,   ChemoSen↑, 1,   eff↑, 1,   Half-Life↓, 1,   RadioS↑, 1,  

Clinical Biomarkers(tgid=22) ⓘ

EGFR↓, 1,   IL6↓, 1,  

Functional Outcomes(tgid=23) ⓘ

toxicity↓, 1,  
Total Targets: 31

Pathway results for Effect on Normal Cells:


Total Targets: 0

Scientific Paper Hit Count for: pH, Intracellular pH / Intracellular Acidification(opposite)
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#:13  Target#:250  State#:%  Dir#:%
  wNotes=0  sortOrder:rid,rpid

 

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