Efficient generation and characterization of chimeric dengue viral-like particles

Area of Science:

• Virology
• Biotechnology
• Immunology

Background:

• Viral-like particles (VLPs) are valuable tools in diagnostics, drug delivery, and vaccine development due to their non-infectious and immunogenic nature.
• Dengue virus (DENV) is inefficient in VLP production, limiting its application.
• Vesicular Stomatitis virus (VSV) G protein's stem and transmembrane regions are known to facilitate VLP budding.

Purpose of the Study:

• To enhance Dengue virus (DENV) virus-like particle (VLP) production by creating chimeric VLPs.
• To assess the immunogenicity and functional properties of these novel chimeric DENV VLPs.

Main Methods:

• Generated chimeric DENV-2 VLPs by replacing E protein regions with corresponding VSV G protein regions (STEM or TM).
• Quantified VLP secretion levels and cellular expression.
• Evaluated VLP recognition by monoclonal antibody 4G2 and interaction with patient sera.
• Assessed heparin-binding affinity and cell-cell fusion activity.

Main Results:

• Chimeric VLPs were secreted at 2-4 fold higher levels than wild-type DENV VLPs.
• Antigenic determinants were preserved, as shown by recognition with antibody 4G2 and patient sera.
• Chimeric VLPs retained heparin-binding affinity, indicating preserved function.
• Cell-cell fusion activity did not significantly increase in chimeras compared to wild-type DENV.

Conclusions:

• Chimeric Dengue virus (DENV) virus-like particles (VLPs) demonstrate significantly improved production efficiency.
• These enhanced VLPs maintain crucial antigenic and functional characteristics.
• The study suggests chimeric DENV VLPs hold promise for vaccine production and serodiagnosis applications.