Effective Therapy Using a Liposomal siRNA that Targets the Tumor Vasculature in a Model Murine Breast Cancer with Lung Metastasis

Yu Sakurai, Tomoya Hada, Akari Kato, Yuta Hagino, Wataru Mizumura, Hideyoshi Harashima

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)


Although metastatic cancer is a major cause of death for cancer patients, no efficacious treatment for metastasis is available. We previously showed that the growth of a primary tumor could be inhibited by the administration of an anti-angiogenic small interfering RNA (siRNA) that is encapsulated in an RGD peptide-modified lipid nanoparticle (RGD-LNP). We herein report on the delivery of siRNA by an RGD-LNP to the vasculature is also effective for treating metastatic tumors. We compared the RGD-LNP with the polyethylene glycol (PEG)ylated LNP (PEG-LNP) in terms of accumulation in a lung-metastasized model. Despite malformed structure of vasculature in the metastasized lung, the accumulation of the PEG-LNP in the metastasized lung was lower than that for the RGD-LNP, which suggests that the delivery strategy based on vascular permeability is not completely effective for targeting metastasis tumors. The systemic injection of the RGD-LNP induced a significant silencing in the metastasized vasculature, but not in the normal lung. In addition, the continuous injection of the RGD-LNP encapsulating siRNA against a delta-like ligand 4 (DLL4) drastically prolonged the overall survival of metastasized model mice. Accordingly, our current findings suggest that vasculature targeting would be more effective than enhanced permeability and retention effect-based therapy for the treatment of metastatic cancer.

Original languageEnglish
Pages (from-to)102-108
Number of pages7
JournalMolecular Therapy - Oncolytics
Publication statusPublished - 2018 Dec 21
Externally publishedYes


  • RGD peptide
  • lipid nanoparticle
  • lung metastasis
  • siRNA

ASJC Scopus subject areas

  • Molecular Medicine
  • Oncology
  • Cancer Research
  • Pharmacology (medical)


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