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Spumaviruses isolated from sources containing agents of non-A, non-B (NANB) hepatitis do not cause NANB hepatitis
B Williams1, A M Prince, T Huima
1Laboratory of Virology, Lindsley F. Kimball Research Institute of The New York Blood Center, New York 10021.
Abstract:
Serum and liver tissue containing infective non-A, non-B hepatitis virus were shown to contain a retrovirus-like agent that replicated when inoculated into chimpanzee liver cell cultures in vitro. The virus appeared to assemble its core particles in association with tubular structures reminiscent of those characteristically seen in non-A, non-B hepatitis virus-infected chimpanzee liver in vivo, and produced syncytial cytopathic effects in a number of continuous and a primary mammalian liver cells. The agents were neutralized by acute and convalescent sera from human and chimpanzee cases of non-A, non-B hepatitis, as well as by antisera against simian spumavirus type 7, but not type 6. Aluminum chloride failed to abolish viral infectivity. There was no evidence of virus replication or hepatitis in chimpanzees inoculated with a seventh passage of one of the isolates. Thus the data suggest that the isolates are not causally related to non-A, non-B hepatitis, as was previously postulated.
Insights
Researchers investigated a retrovirus-like agent in non-A, non-B hepatitis. The agent replicated in vitro but did not cause hepatitis in chimpanzees, suggesting it
Area of Science:
- Virology
- Hepatology
- Cell Biology
Background:
- Non-A, non-B hepatitis is a significant public health concern.
- Previous studies suggested a retrovirus-like agent might be involved in non-A, non-B hepatitis.
- Understanding the causative agent is crucial for developing diagnostics and treatments.
Purpose of the Study:
- To investigate a retrovirus-like agent found in non-A, non-B hepatitis samples.
- To determine if this agent is the causative factor in non-A, non-B hepatitis.
- To characterize the replication and pathogenic potential of the agent.
Main Methods:
- Inoculation of chimpanzee liver cell cultures with serum and liver tissue containing the agent.
- Observation of viral replication and cytopathic effects in vitro.
- Neutralization assays using human and chimpanzee sera and antisera against simian spumavirus.
- Inoculation of chimpanzees with the agent to assess infectivity and pathogenicity.
Main Results:
- The retrovirus-like agent replicated in chimpanzee liver cell cultures in vitro.
- The agent produced syncytial cytopathic effects in mammalian liver cells.
- The agent was neutralized by sera from non-A, non-B hepatitis cases and antisera against simian spumavirus type 7.
- No evidence of virus replication or hepatitis was observed in chimpanzees inoculated with the agent.
Conclusions:
- The investigated retrovirus-like agent replicates in vitro and shares some characteristics with known viruses.
- The agent's inability to cause hepatitis in chimpanzees suggests it is not the causative agent of non-A, non-B hepatitis.
- Further research is needed to identify the true etiological agent of non-A, non-B hepatitis.