Cytopathic effect induced by rabies virus in McCoy cells

Area of Science:

• Virology
• Cell Biology
• Immunology

Background:

• Rabies virus poses a significant public health threat.
• Developing efficient cell culture systems for rabies virus research is crucial.
• Understanding virus-host interactions, including interferon responses, is key to control strategies.

Purpose of the Study:

• To evaluate McCoy cells as a host system for rabies virus cultivation.
• To characterize the cytopathic effect (CPE) and virus production in infected McCoy cells.
• To assess the sensitivity of rabies virus-infected McCoy cells to interferons.

Main Methods:

• Cultivation of fixed and street rabies virus strains in McCoy cells.
• Observation and documentation of cytopathic effects (CPE) over time.
• Quantification of virus titers in cell supernatants using plaque assays.
• Detection of rabies antigens via direct immunofluorescence labeling.
• Assessment of neutralization by specific antibodies and inhibition by various human and murine interferons.

Main Results:

• McCoy cells exhibited characteristic cytopathic changes 24-72 hours post-infection.
• Higher rabies virus titers were observed in McCoy cells compared to VERO cells.
• Virus titers increased with passages, reaching high levels after three passages.
• Rabies antigens were widely detected in infected McCoy cells.
• Specific antibodies neutralized virus growth and CPE.
• Human interferons (HuIFN-alpha, -gamma) inhibited virus, while murine interferons did not.

Conclusions:

• McCoy cells are a suitable and efficient host for rabies virus replication.
• The high virus production and distinct CPE in McCoy cells facilitate virus detection and study.
• The differential sensitivity to human interferons highlights specific antiviral pathways involved.
• Rabies-infected McCoy cell cultures offer a valuable assay system for research and diagnostics.