Dengue viral antigens in host cell membranes

Area of Science:

• Virology
• Immunology
• Cell Biology

Background:

• Dengue virus type 2 (DEN-2) infection poses a significant global health challenge.
• Understanding DEN-2 antigen localization within infected cells is crucial for developing effective diagnostics and vaccines.

Purpose of the Study:

• To characterize DEN-2 antigens present in cellular membranes of infected BHK cells.
• To evaluate the immunogenicity of these membrane fractions and their reactivity in serological assays.

Main Methods:

• BHK cells were infected with DEN-2.
• Cellular membranes were isolated and fractionated using sucrose density gradient centrifugation.
• Fractions were used as antigens in complement fixation, hemagglutination inhibition, and plaque reduction neutralization tests.

Main Results:

• Membrane fractions from DEN-2 infected cells elicited antibodies detectable by multiple serological assays.
• Complement-fixing antigens were associated with all membrane fractions, including the plasma membrane.
• Anti-hemagglutinin reactive antigens were primarily found in rough and smooth endoplasmic reticulum fractions.

Conclusions:

• Cellular membranes of DEN-2 infected cells contain immunogenic antigens.
• Specific membrane fractions harbor distinct DEN-2 antigens, offering targets for diagnostic and therapeutic strategies.
• These findings contribute to the understanding of DEN-2 replication and antigen presentation.