In a framework of a study on retrovirus expression in Syrian hamster (mesocricetus auratus), three cell lines were examined by electron microscopy. As we had previously demonstrated the efficacy of demethylating drug in activating the formation of retroviral particles, we used 5-azacytidine to activate endogenous retrovirus expression. Proceeding to a more detailed survey we were able to observe various types of retrovirions. All of them were present in the different activated cell lines. They were: intracisternal R-type particles (IRP), intracisternal A-type particles (IAP), intracytoplasmic A-type particle (ICAP), intramitochondrial A-type particle (IMAP) and M-432 virus-like particles. Some of these particles have never been described before in Syrian hamster cells. The significance of their presence is discussed here.
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