Abstract

Interferon inhibits uptake of the radiolabeled queuine analog, rQT 3, into cultured human fibroblasts. Simultaneous exposure to 10 nM phorbol-12, 13-didecanoate (PDD) potentiates interferon-induced inhibition of rQT 3 into cultured fibroblasts. All three major classes of human interferon tested affected uptake similarly, with fibroblasts derived beta-interferon being more effective in dose response than gamma or alpha interferons. This suggests that endogenous production of interferon by cultured cells, such as that observed during a low grade viral infection, inhibits queuine uptake and may subsequently lead to a decreased level of queuine modified transfer RNA. Queuine-hypomodified transfer RNA has been implicated in growth control, differentiation and neoplastic transformation.

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