Abstract
The infection of tissue-cultured Aedes albopictus (mosquito) cells by an alphavirus ultimately results in a persistently infected cell population which can be maintained in the laboratory for years. One characteristic of this culture is that it will not support the replication of superinfecting homologous virus. We have previously shown that mosquito cells persistently infected with Sindbis virus produce an antiviral agent which when applied to uninfected mosquito cells suppresses Sindbis virus replication. The exclusion of virus replication in the antiviral-agent-treated cells is similar to the phenomenon of homologous interference described in alphavirus-infected vertebrate cells. In this study we examined the expression of homologous interference in three lines of mosquito cells and compared the expression of homologous interference to the effects of the antiviral activity. The cell lines were found to differ in their ability to express homologous interference, and evidence suggests that the mosquito cells may suppress replication by homologous interference or by the action of the antiviral agent.
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