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Neutralization of adenovirus infectivity and cytotoxin in various cell cultures
Abstract:
The neutralization of human adenovirus 5 and 11 by homologous and heterologous rabbit antisera was determined by CPE inhibition in various cell cultures (HeLa, HEL, Vero, secondary kidney cells from cercopithecus, rabbit, mouse), or in HeLa cells made impermissive by IUdR inhibition. The results concerning sensitivity and specificity were similar in all cases. Crude and purified virus showed similar neutralization. Immunofluorescence neutralization in HeLa cell cultures gave similar results; this method is suitable for demonstrating subtle immunological relations between adenovirus types. The neutralization of the early cytopathic factor ('cytotoxin') showed a pattern of cross-reactivity different from the virion; the cytotoxin was found to be active in part of the cell cultures only. It is concluded from the results that the virus function(s) blocked by antibody appear to be identical for the replicative cycle in infection and for the initiation of the abortive infection in non-permissive cells. Hence, either kind of cells may be used for neutralization tests.
Insights
Rabbit antisera effectively neutralize human adenoviruses 5 and 11. Neutralization tests using various cell cultures and immunofluorescence confirmed similar sensitivity and specificity, indicating broad applicability for adenovirus research.
Area of Science:
- Virology
- Immunology
Background:
- Human adenoviruses (HAdVs) are significant human pathogens.
- Understanding adenovirus neutralization is crucial for developing antiviral strategies and vaccines.
Purpose of the Study:
- To determine the neutralization efficacy of rabbit antisera against human adenovirus serotypes 5 and 11.
- To compare different cell culture systems and methods for adenovirus neutralization assays.
Main Methods:
- Cytopathic effect (CPE) inhibition assays were performed in multiple cell lines (HeLa, HEL, Vero, cercopithecus, rabbit, and mouse kidney cells).
- HeLa cells were also rendered impermissive using IUdR inhibition.
- Immunofluorescence neutralization assays were conducted in HeLa cells.
- Neutralization of the early cytopathic factor ('cytotoxin') was also assessed.
Main Results:
- Homologous and heterologous rabbit antisera effectively neutralized human adenoviruses 5 and 11.
- Similar sensitivity and specificity were observed across various cell culture systems and with crude or purified virus.
- Immunofluorescence provided comparable results and is suitable for detecting subtle immunological relationships between adenovirus types.
- Neutralization of the viral cytotoxin exhibited a different cross-reactivity pattern compared to the virion.
Conclusions:
- Antibody-mediated blocking of virus functions is consistent for both productive replication and abortive infections.
- Various cell culture systems, including those made impermissive, are suitable for adenovirus neutralization testing.
- Immunofluorescence is a valuable tool for detailed immunological characterization of adenovirus serotypes.