Liposome-anchored vascular endothelial growth factor aptamers

Area of Science:

• Biotechnology
• Drug Discovery
• Molecular Biology

Background:

• Nuclease-resistant aptamers are a novel class of drug candidates.
• Aptamers can be chemically synthesized and modified for improved properties.
• Vascular Endothelial Growth Factor (VEGF) plays a key role in angiogenesis and vascular permeability.

Purpose of the Study:

• To prepare and characterize a nuclease-resistant VEGF aptamer anchored in liposome bilayers.
• To evaluate the effect of liposome anchoring on aptamer stability and anti-VEGF activity.
• To assess the in vitro and in vivo efficacy of the liposome-anchored aptamer.

Main Methods:

• Chemical synthesis of a nuclease-resistant aptamer with a lipid anchor.
• Anchoring the aptamer to liposome bilayers.
• Assessing VEGF binding affinity and plasma residence time.
• Evaluating inhibition of VEGF-induced endothelial cell proliferation in vitro.
• Assessing inhibition of vascular permeability increase and angiogenesis in vivo.

Main Results:

• Liposome anchoring significantly improved the plasma residence time of the aptamer.
• High-affinity binding to VEGF was maintained after liposome anchoring.
• The liposome-anchored aptamer demonstrated dramatically improved inhibitory activity against VEGF-induced endothelial cell proliferation in vitro.
• Liposome anchoring led to enhanced inhibition of vascular permeability and angiogenesis in vivo.

Conclusions:

• Liposome anchoring is a viable strategy to enhance the stability and therapeutic efficacy of aptamers.
• This approach offers a promising new method for developing aptamer-based drugs targeting VEGF.
• The enhanced aptamer system shows potential for treating angiogenesis-related diseases.