Human norovirus culture in B cells

Area of Science:

• Virology
• Immunology
• Microbiology

Background:

• Human noroviruses (HuNoVs) are a primary cause of foodborne illness and gastroenteritis outbreaks globally.
• The inability to cultivate HuNoVs in vitro has significantly impeded the development of vaccines and antiviral therapies.
• Recent findings indicate that HuNoVs can replicate in human B cells, with commensal bacteria acting as a crucial cofactor.

Purpose of the Study:

• To provide detailed methods for culturing the GII.4-Sydney HuNoV strain in human B cells.
• To establish a coculture system for studying HuNoV infection across epithelial barriers.
• To describe protocols for bacterial stimulation of HuNoV infection and measurement of viral attachment.

Main Methods:

• Culturing GII.4-Sydney HuNoV directly in human B cells.
• Utilizing a coculture system with a confluent epithelial barrier.
• Employing bacterial stimulation to enhance HuNoV infection.
• Quantifying viral attachment to B cell surfaces using RT-qPCR.

Main Results:

• Successful replication of GII.4-Sydney HuNoV in human B cells was demonstrated.
• A coculture model was established to mimic in vivo infection dynamics.
• Bacterial stimulation was shown to promote HuNoV infection.
• Methods for assessing viral attachment and replication efficiency were detailed.

Conclusions:

• The described protocol facilitates the in vitro cultivation of HuNoV, overcoming a major hurdle in viral research.
• This system provides a platform for studying HuNoV pathogenesis and for screening potential therapeutic interventions.
• Understanding the role of commensal bacteria offers new avenues for controlling norovirus infections.