Defective parvoviruses acquired via the transplacental route protect mice against lethal adenovirus infection

Area of Science:

• Virology
• Immunology
• Molecular Biology

Background:

• Adeno-associated virus type 1 (AAV-1) is a parvovirus.
• Murine adenovirus (MAV) is a species of Mastadenavirus.
• Viral interference is a phenomenon where one virus inhibits the replication of another.

Purpose of the Study:

• To investigate the interaction between AAV-1 and MAV.
• To determine if AAV-1 can protect against MAV infection.
• To examine the immune response to AAV-1 following MAV challenge.

Main Methods:

• Primary mouse kidney cell cultures were used to study viral replication.
• 1-day-old ICR mice were infected with AAV-1 and/or MAV.
• Transplacental AAV-1 acquisition was established.
• Mice were challenged with MAV to assess protection.
• Viral replication and antibody production were measured.

Main Results:

• AAV-1 interfered with MAV replication in vitro and in vivo.
• Mice with transplacentally acquired AAV-1 were protected from lethal MAV infection.
• Repeated MAV challenges in AAV-1-carrying mice triggered AAV-1 replication.
• Antibodies to AAV-1 were detected after MAV challenge.

Conclusions:

• AAV-1 exhibits inhibitory effects on MAV replication.
• Transplacental transfer of AAV-1 provides protection against MAV.
• MAV infection can act as a trigger for latent AAV-1 replication and subsequent immune response.