Abstract
Several long-term cultures were established from a spontaneous melanoma of a cat. Cells were rounded or spindle shaped and exhibited black/brown pigmentation in the cytoplasm. No virus was released from these cells spontaneously or after treatment with chemicals. However, exogenous infection of the cat melanoma cells with the endogenous cat virus RD114 resulted in remarkable morphological and functional changes. Most of the RD114 virus-infected cells exhibited multiple neuritic extensions and about 1-2% of the population showed characteristics of neuronal cells. Because human, mouse, and hamster melanoma cultures infected with various mammalian retroviruses, including the RD114 virus, did not display any morphological alteration, it is concluded that the neuronal cell differentiation in the cat melanoma cells is a consequence of its specific interaction with the endogenous cat retrovirus.
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