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PDE5a Inhibition Restricts Cancer Metastasis by Disrupting NPC1-Mediated Cholesterol Trafficking Through a
Yarden Ariav1, Samah Hayek2, Thomas Cantore3
1Weizmann Institute of Science Rehovot Israel.
Cancer Research
|July 14, 2026
Summary
Phosphodiesterase type 5 A (PDE5a) inhibitors like sildenafil cause cancer cells to accumulate cholesterol, hindering metastasis. Combining sildenafil with statins enhances survival by blocking cholesterol export and synthesis.
Area of Science:
- Oncology
- Molecular Biology
- Pharmacology
Background:
- Non-canonical metabolic functions of signaling molecules are key drivers of cancer plasticity and metastasis.
- Cholesterol metabolism plays a critical role in cancer progression and cell migration.
Purpose of the Study:
- To investigate the antimetastatic effects of phosphodiesterase type 5 A (PDE5a) inhibitors.
- To elucidate the molecular mechanisms by which PDE5a inhibitors impact cancer cell cholesterol metabolism and metastasis.
Main Methods:
- Utilized multiple mouse and human cancer models to assess PDE5a inhibitor effects.
- Investigated the interaction between cyclic guanosine monophosphate (cGMP) and the lysosomal cholesterol transporter NPC1.
- Analyzed digital health records to evaluate patient survival data.
Main Results:
- Sildenafil (Viagra) induced lysosomal cholesterol accumulation in cancer cells, reducing cholesterol bioavailability and impairing migration.
- Elevated cGMP levels bound NPC1, disrupting cholesterol export and mimicking Niemann-Pick type C pathology.
- Combined sildenafil and statin therapy showed additive antimetastatic effects and improved patient survival.
Conclusions:
- PDE5a inhibition represents a potential strategy to restrict cancer metastasis by disrupting cholesterol trafficking.
- The findings provide a mechanistic basis for the observed survival benefits of sildenafil, particularly when combined with statins.
- Targeting lysosomal cholesterol homeostasis offers a novel therapeutic approach for cancer treatment.
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