Production of functional antibodies generated in a nonlytic insect cell expression system

Area of Science:

• Biotechnology
• Molecular Biology
• Immunology

Background:

• Adenovirus type 2 (Ad2) penton base protein is a key target for antiviral therapies.
• Existing recombinant antibody production methods can be limited by proteolytic degradation and slow expression analysis.

Purpose of the Study:

• To develop and characterize a nonlytic insect cell expression system for producing monoclonal antibodies against Ad2 penton base protein.
• To explore the generation of bifunctional antibodies by fusing therapeutic genes to antibody domains.

Main Methods:

• Cloning and expression of immunoglobulin genes in Spodoptera frugiperda (Sf9) cells using a nonlytic vector system.
• Utilizing the Orgyia pseudotsugata multicapsid nucleopolyhedrosis virus immediate-early 2 (OpIE2) promoter for gene expression.
• Generating bifunctional antibodies by gene fusion with growth factors or cytokines.

Main Results:

• Transfected Sf9 cells continuously secreted functional monoclonal antibodies recognizing Ad2 penton base protein.
• The nonlytic system allowed for rapid assessment of antibody quantity and activity.
• Recombinant antibodies showed reduced proteolytic degradation compared to cytolytic baculovirus systems.
• Antibody production levels were comparable to those from cytolytic baculovirus vectors.

Conclusions:

• A nonlytic insect cell system provides an efficient and stable platform for producing recombinant Ad2 penton base antibodies.
• This system facilitates the development of bifunctional antibodies with potential therapeutic applications.
• The nonlytic approach offers advantages in terms of protein stability and faster analysis compared to lytic systems.