[Superinduction of interferon and and a study of its messenger RNA]

Combined use of interferon inductor poly-IC and antibiotics (cycloheximide and actinomycin D) provided a significant increase (up to 1000 times) in interferon production by chick, mouse, monkey and human cells. Messenger RNA with matrix activity for interferon (mRNA-IF) was isolated from superinduced cells. On translation of mRNA-IF in homogenous and heterogenous cells the specificity of interferons produced was determined by the type of the cells from which mRNA-IF was isolated. Sedimentation analysis of various mRNA-IF revealed 2 peaks of activity: major (5--15S) and minor (25--30S).