Functional study on baculovirus anti-apoptosis genes.

Area of Science:

• Molecular Biology
• Virology
• Cell Biology

Background:

• Apoptosis, or programmed cell death, is a crucial biological process.
• The Autographa californica Nuclear Polihedrosis Virus (AcNPV) encodes a p35 protein that inhibits apoptosis.
• Understanding the role of p35 in viral replication and host cell survival is important.

Purpose of the Study:

• To investigate the anti-apoptotic function of the AcNPV p35 gene.
• To determine if p35 expression can rescue viral replication in non-permissive cells.
• To establish stable cell lines expressing the p35 gene for enhanced viral propagation.

Main Methods:

• Transient expression of AcNPV p35 gene in Hz-AM1 and Hela cells.
• Co-transfection of AcNPV mutants with p35 expression plasmids.
• Generation of stable cell lines (Sf9-35, Vero-35) via co-transfection and G418 screening.
• Assessing viral replication and propagation in engineered cell lines.

Main Results:

• Transient expression of AcNPV p35 delayed apoptosis in Hz-AM1 and Hela cells.
• Replication of a p35-inactivated AcNPV mutant (Acp35Z) was rescued by co-transfection with p35.
• Established Sf9-35 and Vero-35 cell lines exhibited enhanced AcNPV and measles virus propagation, respectively.

Conclusions:

• The AcNPV p35 gene possesses potent anti-apoptotic activity in insect and mammalian cells.
• p35 expression is essential for rescuing the replication of certain AcNPV mutants.
• Engineered cell lines expressing p35 can significantly improve viral yields for biotechnological applications.