Characterization of poliovirus replicons encoding carcinoembryonic antigen

Area of Science:

• Virology
• Vaccinology
• Molecular Biology

Background:

• Recombinant vaccines offer promising therapeutic and preventative strategies for diseases like cancer and infections.
• Poliovirus has been investigated as a potential vector for delivering foreign genes into cells for vaccination purposes.

Purpose of the Study:

• To construct and evaluate a novel poliovirus-based vector for expressing the carcinoembryonic antigen (CEA) gene.
• To assess the immunogenicity of the recombinant CEA-poliovirus vector in a preclinical mouse model.

Main Methods:

• A recombinant poliovirus replicon was engineered by replacing the poliovirus capsid gene with the CEA gene.
• The replicon was encapsidated using a vaccinia virus helper system to produce infectious virus particles.
• Mice received multiple intramuscular doses of the encapsidated replicon, and immune responses were analyzed.

Main Results:

• A replication-competent poliovirus replicon expressing the CEA gene was successfully constructed.
• Encapsidated CEA-poliovirus replicons were generated and shown to express the CEA protein in infected cells.
• Mice immunized with the vector developed a detectable CEA-specific antibody response after three doses.

Conclusions:

• The poliovirus replicon system can be effectively used to express foreign antigens like CEA.
• This system demonstrates potential as a vaccine vector for inducing antigen-specific immune responses.
• Further development could lead to parenteral and oral vaccine applications using this poliovirus-based platform.