Serological cross reactivity between polyomavirus capsids

Area of Science:

• Virology
• Immunology
• Molecular Biology

Background:

• Polyomaviruses are a diverse group of viruses that can infect humans and nonhuman primates.
• Existing methods for detecting antibodies to polyomaviruses lack standardization.
• Virus-like particles (VLPs) offer a promising platform for developing standardized serological assays.

Purpose of the Study:

• To develop and validate standardized enzyme immunoassays (EIAs) for detecting antibodies to human polyomaviruses (BK, JC) and nonhuman primate polyomaviruses (simian virus 40 [SV40], lymphotropic polyomavirus [LPV]).
• To investigate cross-reactivity patterns between different polyomaviruses using VLP-based EIAs.
• To explore the serological evidence for novel human polyomavirus infections.

Main Methods:

• Production of polyomavirus VLPs using the baculovirus expression system.
• Development of VLP-based EIAs for BK, JC, SV40, and LPV.
• Testing of human and rhesus macaque serum samples.
• Competitive inhibition assays using heterologous VLPs to assess antibody specificity.

Main Results:

• Rhesus macaque sera showed low reactivity to BK and JC VLPs, while human sera showed low reactivity to SV40 and LPV VLPs.
• Competitive inhibition assays indicated significant cross-reactivity between BK, JC, and SV40 antibodies in both human and rhesus macaque sera.
• Human serum reactivity to LPV VLPs was specifically blocked by LPV, suggesting the presence of antibodies to an unknown LPV-related human polyomavirus.

Conclusions:

• VLP-based EIAs provide a standardized method for polyomavirus antibody detection.
• Cross-reactivity is a significant factor in polyomavirus serological studies, particularly involving SV40.
• The findings provide serological evidence for a potential novel human polyomavirus related to LPV, warranting further investigation.