Improving vascular maturation using noncoding RNAs increases antitumor effect of chemotherapy.

Area of Science:

• Oncology
• Vascular Biology
• Molecular Therapy

Background:

• Current antiangiogenesis therapies targeting immature tumor vessels offer limited efficacy.
• Tumor blood vessels are often immature, leaky, and hinder effective drug delivery.

Purpose of the Study:

• To develop an improved vascular-targeted therapy by targeting cancer-associated endothelial cells (ECs).
• To reverse tumor blood vessel leakiness and enhance chemotherapeutic agent delivery.

Main Methods:

• Identified deregulated microRNAs (miRs) in patient-derived cancer-associated ECs.
• Screened a thioaptamer (TA) library for EC-selective TAs, identifying an annexin A2-targeted TA.
• Delivered miR106b-5p and miR30c-5p inhibitors using the TA to modulate ECs.

Main Results:

• Silencing specific miRs decreased vascular permeability and promoted blood vessel maturation.
• Annexin A2-targeted TA delivery of miR inhibitors resulted in vascular maturation.
• Demonstrated antitumor effects without inducing tumor hypoxia.

Conclusions:

• Targeting cancer-associated ECs via miR modulation and TA delivery offers a promising strategy for improving vascular-targeted cancer therapy.
• This approach enhances blood vessel normalization and improves drug delivery, potentially overcoming limitations of current therapies.