Targeting exosomes enveloped EBV-miR-BART1-5p-antagomiRs for NPC therapy through both anti-vasculogenic mimicry and...

Area of Science:

• Oncology
• Molecular Biology
• Biotechnology

Background:

• Nasopharyngeal carcinoma (NPC) is a prevalent head and neck cancer in China, with incompletely understood mechanisms of vasculogenic mimicry (VM) and angiogenesis.
• The role of Epstein-Barr virus-encoded microRNAs (miRNAs) in regulating VM and angiogenesis in NPC remains largely unexplored.
• This study addresses the need to elucidate these mechanisms and explore novel therapeutic avenues for NPC.

Purpose of the Study:

• To investigate the function and molecular mechanism of a targeting exosome system (iRGD-exo-antagomiR) against VM and angiogenesis in NPC.
• To evaluate the potential of this system as a novel therapeutic approach for NPC.

Main Methods:

• Exosomes were isolated and characterized using dynamic light scattering, transmission electron microscopy, and western blotting.
• In vitro and in vivo assays, including 3D-culture, tube formation, chicken chorioallantoic membrane, Matrigel plug, and mouse xenograft models, were employed to assess anti-VM and anti-angiogenic effects.
• Western blotting was used to analyze downstream molecular networks.

Main Results:

• Treatment with iRGD-tagged exosomes containing antagomiR-BART1-5p effectively suppressed VM and angiogenesis in NPC models, both in vitro and in vivo.
• Epstein-Barr virus-encoded miRNA-BART1-5p was found to promote VM and angiogenesis by regulating VEGF, PI3K, Akt, mTOR, and HIF1-α in a Spry2-dependent manner.
• The targeting exosome system demonstrated specific suppression of these processes.

Conclusions:

• Targeting exosomes loaded with Epstein-Barr virus-encoded miRNA-BART1-5p antagomiRs provide a promising therapeutic strategy for NPC.
• This approach leverages both anti-vasculogenic mimicry and anti-angiogenesis effects, mediated via a Spry2-dependent pathway.
• The findings offer new avenues for improving comprehensive NPC treatment.